NEET Full-Length Mock Test 17

NEET Mock Test - 2026

Test 17

Number Of Questions: 180

Time: 3 hours

Correct answer Carries: 4.

Wrong Answer Carries: -1.

3:00:00

Physics

What is the phase difference corresponding to a path difference of \( 5\lambda/4 \) in a double-slit experiment?

Phase difference \( \phi = \frac{2\pi}{\lambda} \Delta \).

For \( \Delta = \frac{5\lambda}{4} \), \( \phi = \frac{2\pi}{\lambda} \cdot \frac{5\lambda}{4} = \frac{5\pi}{2} \).

\( \pi \)
\( 2\pi \)
\( \frac{5\pi}{2} \)
\( \frac{3\pi}{2} \)
3

A bar magnet with original \( m = 2.0 \, \text{A m}^2 \) is cut transversely into two equal parts. What is \( m \) of each part?

When cut transversely, each part has half the original magnetic moment.

Given: \( m = 2.0 \, \text{A m}^2 \).

Each part: \( m' = \frac{2.0}{2} = 1.0 \, \text{A m}^2 \).

0.8 A m²
0.9 A m²
0.95 A m²
1.0 A m²
4

A wire of length \( 3 \, \text{m} \) and resistance \( 6 \, \Omega \) is stretched to \( 6 \, \text{m} \). What is the new resistance?

Volume constant: \( l A = l' A' \Rightarrow A' = \frac{A}{2} \).

New resistance: \( R' = \frac{\rho l'}{A'} = \frac{\rho (2l)}{\frac{A}{2}} = 4 \frac{\rho l}{A} = 4R = 4 \times 6 = 24 \, \Omega \).

\( 18 \, \Omega \)
\( 20 \, \Omega \)
\( 24 \, \Omega \)
\( 28 \, \Omega \)
3

A \( 45 \, \text{kg} \) man in a lift accelerating downward at \( 1.5 \, \text{m/s}^2 \) stands on a scale. What is the reading? (Take \( g = 10 \, \text{m/s}^2 \))

Scale reads normal force.

Net force: \( N - mg = ma \), where \( a = -1.5 \, \text{m/s}^2 \).

\( N - 45 \times 10 = 45 \times (-1.5) \).

\( N - 450 = -67.5 \Rightarrow N = 382.5 \, \text{N} \).

350 N
382.5 N
400 N
420 N
2

What is the SI unit of a quantity with dimensional formula \( [M L^{-1} T^{-2}] \)?

\( [M] = \text{kg}, [L] = \text{m}, [T] = \text{s} \).

\( [M L^{-1} T^{-2}] = \text{kg m}^{-1} \text{s}^{-2} \).

(Pressure = \( [M L^{-1} T^{-2}] \), unit = Pa).

kg m s⁻²
kg m⁻¹ s⁻²
kg m² s⁻²
kg m⁻² s⁻¹
2

A square loop of side \( 0.2 \, \text{m} \) with 30 turns carries \( 1.5 \, \text{A} \) in a magnetic field of \( 0.4 \, \text{T} \). The plane of the loop is at \( 60^\circ \) to the field. What is the torque?

Torque \( \tau = N I A B \sin \theta \), where \( A = 0.2 \times 0.2 = 0.04 \, \text{m}^2 \).

\( \tau = 30 \times 1.5 \times 0.04 \times 0.4 \times \sin 60^\circ = 1.8 \times 0.4 \times 0.866 = 0.6235 \approx 0.62 \, \text{N m} \).

0.31 N m
0.62 N m
1.24 N m
0.93 N m
2

A uniform field \( E = 5 \times 10^3 \, \text{N/C} \) is along the x-axis. What is the net flux through a cube of side 30 cm with faces parallel to coordinate planes?

Flux through face at \( x = 0 \): \( \phi = E \times A = 5 \times 10^3 \times (0.3)^2 = 450 \, \text{Nm}^2/\text{C} \) (inward).

Flux through face at \( x = 0.3 \): \( 450 \, \text{Nm}^2/\text{C} \) (outward).

Net flux: \( 450 - 450 = 0 \, \text{Nm}^2/\text{C} \) (no charge enclosed).

\( 0 \, \text{Nm}^2/\text{C} \)
\( 450 \, \text{Nm}^2/\text{C} \)
\( 900 \, \text{Nm}^2/\text{C} \)
\( 1350 \, \text{Nm}^2/\text{C} \)
1

What ensures that the total voltage drop across a series circuit equals the source voltage?

Kirchhoff’s loop rule (conservation of energy) ensures that the sum of potential drops across all elements in a closed loop equals the supplied voltage, as energy is conserved in the circuit.

Current cancellation
Resistance equality
Charge accumulation
Energy conservation
4

Why does the electric field inside a conductor vanish in electrostatic equilibrium, even if the conductor is irregularly shaped?

In electrostatic equilibrium, free charges in a conductor redistribute to cancel any internal electric field. If there were a field inside, it would exert a force on the free charges, causing them to move until the field becomes zero everywhere inside. This principle holds regardless of shape because conductors allow charge mobility, and equilibrium requires \( E = 0 \) inside, with all excess charge residing on the surface, adjusting to the geometry.

Charges redistribute to cancel the internal field
The shape prevents field penetration
The conductor absorbs the external field
The field accumulates on the surface only
1

A particle has an initial velocity of 3 î m/s and a constant acceleration of 2 ĵ m/s². What is the magnitude of its displacement after 3 s?

Displacement r = v₀ t + (1/2) a t².

x = v₀x t = 3 × 3 = 9 m.

y = (1/2) a_y t² = (1/2) × 2 × 3² = 9 m.

Magnitude |r| = √(x² + y²) = √(9² + 9²) = √162 ≈ 12.73 m.

9 m
18 m
12.73 m
15 m
3

What is the critical angle for a diamond (\( n = 2.42 \)) to water (\( n = 1.33 \)) interface?

Critical angle: \( \sin i_c = \frac{n_2}{n_1} \).

Diamond (\( n_1 = 2.42 \)), water (\( n_2 = 1.33 \)).

\( \sin i_c = \frac{1.33}{2.42} \approx 0.55 \).

\( i_c = \sin^{-1}(0.55) \approx 33.4^\circ \).

33°
40°
45°
50°
1

Why is the concept of thermal equilibrium essential to the Zeroth Law of Thermodynamics?

The Zeroth Law relies on thermal equilibrium, where no net heat flows between systems in contact, establishing that systems sharing this property with a third system have a common property—temperature—thus defining temperature measurement.

It ensures heat flow
It defines temperature equality
It measures work done
It prevents energy conservation
2

A \( 0.3 \, \text{kg} \) lead block at \( 400^\circ \text{C} \) is placed in \( 0.7 \, \text{kg} \) water at \( 15^\circ \text{C} \) in a \( 0.1 \, \text{kg} \) aluminium calorimeter at \( 15^\circ \text{C} \). Find the final temperature. (Specific heat of lead = \( 127.7 \, \text{J kg}^{-1} \text{K}^{-1} \), water = \( 4186 \, \text{J kg}^{-1} \text{K}^{-1} \), aluminium = \( 900 \, \text{J kg}^{-1} \text{K}^{-1} \))

\( 0.3 \times 127.7 \times (400 - T) = (0.7 \times 4186 + 0.1 \times 900) \times (T - 15) \).

\( 15324 - 38.31 T = (2930.2 + 90) \times (T - 15) = 3020.2 T - 45303 \).

\( 15324 + 45303 = 3020.2 T + 38.31 T \).

\( 60627 = 3058.51 T \Rightarrow T \approx 19.82^\circ \text{C} \approx 19.8^\circ \text{C} \).

19°C
19.5°C
19.8°C
20°C
3

A steel wire of length 2 m and cross-sectional area 2 × 10-6 m2 is stretched by a force of 200 N. If the Young's modulus of steel is 2 × 1011 N/m2, what is the elongation of the wire?

Using Young's modulus formula: Y = (F L) / (A ΔL).

Rearrange for elongation: ΔL = (F L) / (A Y).

Substitute values: ΔL = (200 × 2) / (2 × 10-6 × 2 × 1011).

Calculate: ΔL = 400 / (4 × 105) = 10-3 m = 1 mm.

1 mm
2 mm
0.5 mm
1.5 mm
1

What is the nature of the force between two parallel wires carrying currents in opposite directions?

Two parallel wires with currents in opposite directions experience a repulsive force because the magnetic field produced by one wire interacts with the current in the other, causing them to push apart.

Repulsive
Attractive
No force
Oscillatory
1

A \( 1.5 \, \text{kg} \) pendulum bob completes a vertical circle of radius \( 1.8 \, \text{m} \). What is the speed at the bottom? (Take \( g = 10 \, \text{m/s}^2 \))

At top, \( v_C = \sqrt{gL} \), energy conservation: \( \frac{1}{2} m v_0^2 = \frac{1}{2} m (gL) + 2mgL \).

\( v_0^2 = 5gL = 5 \times 10 \times 1.8 = 90 \Rightarrow v_0 = \sqrt{90} \approx 9.49 \, \text{m/s} \).

9 m/s
9.5 m/s
10 m/s
10.5 m/s
2

A spring (\( k = 400 \, \text{N/m} \)) is stretched by \( 0.25 \, \text{m} \). What is the stored potential energy?

Potential energy \( V = \frac{1}{2} k x^2 = \frac{1}{2} \times 400 \times (0.25)^2 = 200 \times 0.0625 = 12.5 \, \text{J} \).

11 J
12.5 J
14 J
15.5 J
2

A rod rotates at 20 rad/s in a 0.4 T field. If the length from the axis to the tip is 0.5 m, what is the emf induced?

\( \varepsilon = \frac{1}{2} B \omega R^2 \).

\( \varepsilon = \frac{1}{2} \times 0.4 \times 20 \times (0.5)^2 = 5 \, \text{V} \).

2.5 V
4 V
5 V
6 V
3

The process of adding impurities to a pure semiconductor is called:

Doping is the deliberate addition of impurities (e.g., pentavalent or trivalent atoms) to a pure semiconductor to increase its conductivity by providing additional charge carriers.

Diffusion
Doping
Drift
Recombination
2

Two cells of emf \( 4 \, \text{V} \) and \( 5 \, \text{V} \) with internal resistances \( 0.5 \, \Omega \) and \( 1 \, \Omega \) are connected in series with a \( 5.5 \, \Omega \) resistor. What is the current through the circuit?

Equivalent emf: \( \varepsilon_{\text{eq}} = 4 + 5 = 9 \, \text{V} \).

Total resistance: \( R_{\text{total}} = 0.5 + 1 + 5.5 = 7 \, \Omega \).

Current: \( I = \frac{\varepsilon_{\text{eq}}}{R_{\text{total}}} = \frac{9}{7} \approx 1.29 \, \text{A} \).

\( 1.29 \, \text{A} \)
\( 1.3 \, \text{A} \)
\( 1.5 \, \text{A} \)
\( 1.6 \, \text{A} \)
1

The work function of a metal is \( 1.5 \, \text{eV} \). Light of wavelength \( 400 \, \text{nm} \) is incident on it. What is the maximum kinetic energy of emitted electrons in eV? (Take \( h c = 1240 \, \text{eV nm} \))

\( E = \frac{h c}{\lambda} = \frac{1240}{400} = 3.1 \, \text{eV} \).

\( K_{\max} = E - \phi_0 = 3.1 - 1.5 = 1.6 \, \text{eV} \).

1.4 eV
1.6 eV
1.8 eV
2.0 eV
2

A pipe open at both ends has a length of 0.85 m and resonates with a source of frequency 600 Hz. What is the harmonic number if the speed of sound is 340 m/s?

\( v_n = \frac{n v}{2L} \).

\( 600 = \frac{n \times 340}{2 \times 0.85} = \frac{n \times 340}{1.7} \).

\( 600 = n \times 200 \Rightarrow n = \frac{600}{200} = 3 \).

Third harmonic.

2
4
5
3
4

At STP, 22.4 litres of oxygen gas (\(O_2\)) is present. What is the mass of this gas? (Molecular mass of \(O_2 = 32 \, \text{u}\), \(1 \, \text{u} = 1 \, \text{g/mol}\))

At STP (273 K, 1 atm), 1 mole of any ideal gas occupies 22.4 litres (molar volume).

Given volume = 22.4 litres, so number of moles (\(\mu\)) = \( \frac{22.4}{22.4} = 1 \, \text{mol} \).

Mass = \(\mu \times \text{molecular mass} = 1 \times 32 = 32 \, \text{g} \).

16 g
32 g
48 g
64 g
2

A coil is wound tightly around a core material. If the current through it changes rapidly, the induced emf opposing this change is an example of which phenomenon?

This is self-induction, where a changing current in a coil induces an emf that opposes the change, proportional to the coil’s self-inductance.

Self-induction
Mutual induction
Electrostatic induction
Magnetic saturation
1

The ripple in a rectifier output is reduced by using:

A capacitor filter smooths the pulsating DC output by charging during peaks and discharging during troughs, reducing AC ripples to provide a steadier DC voltage.

Transformer
Capacitor
Resistor
Diode
2

What is the minimum speed to escape from \( 3 R_E \) from Earth’s center? (\( g = 9.8 \, \text{m/s}^2, R_E = 6.4 \times 10^6 \, \text{m} \))

\( v_e = \sqrt{\frac{2 g R_E^2}{3 R_E}} = \sqrt{\frac{2 \times 9.8 \times 6.4 \times 10^6}{3}} \).

\( v_e = \sqrt{4.181 \times 10^7} \approx 6.47 \times 10^3 \, \text{m/s} \approx 6.5 \, \text{km/s} \).

6.2 km/s
6.4 km/s
6.5 km/s
6.7 km/s
3

The frequency \( f \) of a spring depends on mass \( m \) and spring constant \( k \) as \( f = k_0 m^a k^b \). Given \( [f] = [T^{-1}] \) and \( [k] = [M T^{-2}] \), find \( a \) and \( b \).

\( [m] = [M] \), \( [k] = [M T^{-2}] \).

\( [T^{-1}] = [M]^a [M T^{-2}]^b = [M^{a+b} T^{-2b}] \).

Equate: \( a + b = 0 \), \( -2b = -1 \Rightarrow b = 1/2 \).

\( a + 1/2 = 0 \Rightarrow a = -1/2 \).

\( a = -1/2, b = 1/2 \).

a = 1/2, b = -1/2
a = -1, b = 1
a = 1, b = -1
a = -1/2, b = 1/2
4

A series LCR circuit has \( R = 100 \, \Omega \), \( X_L = 80 \, \Omega \), \( X_C = 60 \, \Omega \). What is the impedance?

\( Z = \sqrt{R^2 + (X_L - X_C)^2} \).

\( Z = \sqrt{100^2 + (80 - 60)^2} = \sqrt{10000 + 400} = \sqrt{10400} \approx 102 \, \Omega \).

100 Ω
102 Ω
105 Ω
110 Ω
2

A projectile is launched at \( 4 \, \text{km/s} \) from Earth’s surface. What is its maximum distance from the center? (Escape speed = \( 11.2 \, \text{km/s}, R_E = 6.4 \times 10^6 \, \text{m} \))

\( \frac{1}{2} v_i^2 - \frac{v_e^2}{2} = -\frac{v_e^2}{2} \frac{R_E}{r} \).

\( 8 - 62.72 = -62.72 \frac{R_E}{r} \).

\( \frac{r}{R_E} = \frac{62.72}{54.72} \approx 1.15 \).

\( r = 1.15 \times 6.4 \times 10^6 \approx 7.36 \times 10^6 \, \text{m} \).

7.2 × 10⁶ m
7.3 × 10⁶ m
7.4 × 10⁶ m
7.5 × 10⁶ m
3

What is the mass defect of a nucleus with binding energy \( 102.3 \, \text{MeV} \)? (Given \( 1 \, \text{u} = 931.5 \, \text{MeV/c}^2 \))

\( \Delta M = \frac{E_b}{c^2} \).

\( \Delta M = \frac{102.3}{931.5} \approx 0.11 \, \text{u} \).

0.09 u
0.10 u
0.12 u
0.11 u
4

A spring-mass system has \( m = 2.25 \, \text{kg}, k = 900 \, \text{N/m} \). What is its period?

Period: \( T = 2\pi \sqrt{\frac{m}{k}} = 2\pi \sqrt{\frac{2.25}{900}} = 2\pi \sqrt{0.0025} = 2\pi \times 0.05 = 0.314 \, \text{s} \).

0.2 s
0.314 s
0.4 s
0.5 s
2

What is the excess pressure inside a water drop of radius \( 2.5 \, \text{mm} \) at \( 100^\circ \text{C} \)? (Surface tension = \( 0.3 \times 10^{-3} \, \text{N/m} \))

Excess pressure: \( \Delta P = \frac{2 S}{r} \).

\( S = 0.3 \times 10^{-3} \, \text{N/m} \), \( r = 2.5 \times 10^{-3} \, \text{m} \).

\( \Delta P = \frac{2 \times 0.3 \times 10^{-3}}{2.5 \times 10^{-3}} = 0.24 \, \text{Pa} \).

0.20 Pa
0.24 Pa
0.28 Pa
0.32 Pa
2

A hydrogen atom is excited to the \( n = 4 \) state and returns to the ground state. What is the maximum energy of the emitted photon? (Use \( E_n = -\frac{13.6}{n^2} \, \text{eV} \))

\( E_4 = -0.85 \, \text{eV} \), \( E_1 = -13.6 \, \text{eV} \).

\( \Delta E = -0.85 - (-13.6) = 12.75 \, \text{eV} \).

10.2 eV
2.55 eV
1.89 eV
12.75 eV
4

A thin ring of mass \( 4 \, \text{kg} \) and radius \( 0.3 \, \text{m} \) rotates about its center at \( 8 \, \text{rad/s} \). What is its rotational kinetic energy?

\( I = M R^2 = 4 \times (0.3)^2 = 0.36 \, \text{kg m}^2 \).

\( K = \frac{1}{2} I \omega^2 = \frac{1}{2} \times 0.36 \times (8)^2 = 0.18 \times 64 = 11.52 \, \text{J} \).

11.0 J
11.52 J
12.0 J
12.5 J
2

The output frequency of a full-wave rectifier with a 60 Hz input is:

A full-wave rectifier uses both half-cycles of the AC input, doubling the output frequency. For a 60 Hz input, the output frequency is \( 60 \times 2 = 120 \, \text{Hz} \).

60 Hz
120 Hz
30 Hz
180 Hz
2

A particle accelerates uniformly from rest to \( 18 \, \text{m/s} \) in \( 9 \, \text{s} \). What is the distance covered?

Find \( a = \frac{v - v_0}{t} = \frac{18 - 0}{9} = 2 \, \text{m/s}^2 \).

Use \( x = v_0 t + \frac{1}{2} a t^2 = 0 \cdot 9 + \frac{1}{2} \cdot 2 \cdot (9)^2 = 0 + 1 \cdot 81 = 81 \, \text{m} \).

The distance covered is \( 81 \, \text{m} \).

72 m
81 m
90 m
54 m
2

Why are ultraviolet lamps used in water purifiers?

UV lamps are used to kill germs in water purifiers due to their ability to damage living organisms, as mentioned in the document.

To heat the water
To detect impurities
To kill germs
To emit visible light
3

What is the effect of increasing the mass of a rotating body on its angular momentum, if angular velocity remains constant?

Angular momentum \( \mathbf{L} = I \mathbf{\omega} \), and \( I \) increases with mass. If \( \omega \) is constant, \( L \) increases proportionally with mass.

It decreases
It remains constant
It increases
It becomes zero
3

What is the distance of the fifth dark fringe from the central maximum in a double-slit experiment if \( \lambda = 650 \, \text{nm} \), \( d = 0.5 \, \text{mm} \), and \( D = 1.0 \, \text{m} \)?

Dark fringe position \( x_n = \frac{\left(n + \frac{1}{2}\right) \lambda D}{d} \). For the fifth dark fringe, \( n = 4 \).

\( \lambda = 6.5 \times 10^{-7} \, \text{m} \), \( d = 5.0 \times 10^{-4} \, \text{m} \), \( D = 1.0 \, \text{m} \).

\( x_4 = \frac{\left(4 + \frac{1}{2}\right) \times 6.5 \times 10^{-7} \times 1.0}{5.0 \times 10^{-4}} = \frac{4.5 \times 6.5 \times 10^{-7}}{5.0 \times 10^{-4}} = 5.85 \times 10^{-3} \, \text{m} = 5.85 \, \text{mm} \).

5.2 mm
6.5 mm
5.85 mm
7.8 mm
3

Two hollow spherical conductors of different radii are charged with the same amount of charge and then connected by a thin conducting wire. What happens to the charges on the conductors?

When two conductors are connected by a wire, they reach the same potential. The potential on the surface of a spherical conductor is given by \( V = \frac{Q}{4 \pi \varepsilon_0 R} \), where \( Q \) is the charge and \( R \) is the radius. If the radii are different, say \( R_1 \) and \( R_2 \), and initially both have charge \( Q \), after connection, \( V_1 = V_2 \), so \( \frac{Q_1}{R_1} = \frac{Q_2}{R_2} \). Since \( Q_1 + Q_2 = 2Q \), the charges redistribute such that the smaller sphere gets more charge due to its smaller radius (higher potential per unit charge), leading to a redistribution of charges.

Charges redistribute so that the potentials become equal
Charges remain the same on both conductors
All charge transfers to the larger conductor
All charge transfers to the smaller conductor
1

A stone is dropped from rest. What is the distance covered in the 6th second of its fall? (Take \( g = 10 \, \text{m/s}^2 \))

Distance in \( n \)-th second = \( g \cdot \frac{2n - 1}{2} \). For 6th second, \( n = 6 \).

Substitute: \( d = 10 \cdot \frac{2 \cdot 6 - 1}{2} = 10 \cdot \frac{11}{2} = 55 \, \text{m} \).

The distance covered is \( 55 \, \text{m} \).

45 m
50 m
60 m
55 m
4

A fish is at a depth of \( 40 \, \text{cm} \) in water (\( n = 1.33 \)). What is its apparent depth when viewed from above?

Apparent depth = \( \frac{\text{real depth}}{n} \).

Real depth = \( 40 \, \text{cm} \), \( n = 1.33 \).

Apparent depth = \( \frac{40}{1.33} \approx 30.08 \, \text{cm} \).

30 cm
35 cm
40 cm
45 cm
1

The de Broglie wavelength of a particle of mass \( 2.0 \times 10^{-30} \, \text{kg} \) moving at \( 1.5 \times 10^6 \, \text{m/s} \) is:

\( p = m v = 2.0 \times 10^{-30} \times 1.5 \times 10^6 = 3.0 \times 10^{-24} \, \text{kg m/s} \).

\( \lambda = \frac{h}{p} = \frac{6.63 \times 10^{-34}}{3.0 \times 10^{-24}} = 2.21 \times 10^{-10} \, \text{m} = 0.221 \, \text{nm} \).

0.2 nm
0.21 nm
0.221 nm
0.25 nm
3

A \( 4000 \, \text{kg} \) rocket accelerates upward at \( 5 \, \text{m/s}^2 \) while ejecting gas at \( 80 \, \text{kg/s} \) with speed \( 120 \, \text{m/s} \) relative to the rocket. What is the total thrust? (Take \( g = 10 \, \text{m/s}^2 \))

Thrust from gas ejection: \( T_{\text{gas}} = \frac{dm}{dt} \times v_{\text{rel}} = 80 \times 120 = 9600 \, \text{N} \).

Total thrust must provide net force plus overcome gravity.

Net force: \( F_{\text{net}} = ma = 4000 \times 5 = 20000 \, \text{N} \).

Weight: \( mg = 4000 \times 10 = 40000 \, \text{N} \).

Total thrust: \( T_{\text{total}} - mg = ma \Rightarrow T_{\text{total}} - 40000 = 20000 \).

\( T_{\text{total}} = 40000 + 20000 = 60000 \, \text{N} \).

The \( 9600 \, \text{N} \) contributes, but total thrust accounts for all upward force required.

48000 N
56000 N
60000 N
64000 N
3

A material with susceptibility \( \chi = 5 \times 10^{-3} \) has a relative permeability \( \mu_r \) of:

\( \mu_r = 1 + \chi \).

Given: \( \chi = 5 \times 10^{-3} \).

Substitute: \( \mu_r = 1 + 5 \times 10^{-3} = 1.005 \).

1.005
1.003
1.002
1.001
1

Chemistry

What is the atomic number of an element with 8 electrons in its \(L\) shell?

The \(L\) shell (\(n = 2\)) holds up to 8 electrons (2s² 2p⁶). With \(K\) shell full (2 electrons), total electrons = 2 + 8 = 10, so atomic number = 10 (neon).

8
10
18
12
2

For the reaction \( \ce{3A -> 2B + C} \), the concentration of A decreases from 0.27 M to 0.24 M in 15 seconds. What is the average rate of formation of B in \( \ce{mol L^{-1} s^{-1}} \)?

Rate = \( -\frac{1}{3} \frac{\Delta[\ce{A}]}{\Delta t} = \frac{1}{2} \frac{\Delta[\ce{B}]}{\Delta t} = \frac{\Delta[\ce{C}]}{\Delta t} \).

\( \Delta[\ce{A}] = 0.24 - 0.27 = -0.03 \, \ce{mol L^{-1}} \), \( \Delta t = 15 \, \ce{s} \).

\( -\frac{\Delta[\ce{A}]}{\Delta t} = 2.0 \times 10^{-3} \), so \( \frac{\Delta[\ce{B}]}{\Delta t} = \frac{2}{3} \times 2.0 \times 10^{-3} = 1.33 \times 10^{-3} \).

\( 1.33 \times 10^{-3} \)
\( 2.0 \times 10^{-3} \)
\( 6.67 \times 10^{-4} \)
\( 3.0 \times 10^{-3} \)
1

For the reaction \(\ce{N2O(g) + 1/2O2(g) -> 2NO(g)}\), if \(\Delta H = 99.25 kJ/mol\) at 298 K, what is \(\Delta U\) (R = 8.314 J/mol·K)?

\(\Delta n_g = 2 - (1 + 0.5) = 0.5\), \(RT = 2.48 kJ\). \(\Delta H = \Delta U + \Delta n_g RT\). \(\Delta U = 99.25 - 0.5 \times 2.48 = 98.01 kJ/mol\).

101.73 kJ/mol
99.25 kJ/mol
98.01 kJ/mol
96.77 kJ/mol
3

What is the mass of 2 × 10²³ molecules of N₂O? (Molar mass = 44 g/mol, Avogadro number = 6 × 10²³)

Moles = 2 × 10²³ / 6 × 10²³ ≈ 0.3333 mol.

Mass = 0.3333 × 44 ≈ 14.67 g ≈ 14.7 g.

11 g
13 g
14 g
14.7 g
4

A solution is prepared by dissolving 6 g of a substance in 94 g of water, resulting in a 5% by mass solution of the substance. What is the correct mass of the solution?

Total mass = 6 g + 94 g = 100 g.

Mass % = (6 / 100) × 100 = 6%, but question states 5%. Correct total mass = 6 / 0.05 = 120 g.

Mass of water should be 114 g, but given 94 g, assume total mass = 100 g as consistent.

Recalculate: 5% of 120 g = 6 g solute, 114 g water (adjusted context).

120 g
100 g
110 g
130 g
1

2 moles of an ideal gas expand isothermally from 6 L to 18 L against a constant pressure of 1 atm at 340 K. Calculate the work done (1 L·atm = 101.3 J).

\(w = -p_{ex} \Delta V\). \(\Delta V = 18 - 6 = 12 L\), \(p_{ex} = 1 atm\). \(w = -1 \times 12 = -12 L·atm = -12 \times 101.3 = -1215.6 J = -1.22 kJ\).

-1.22 kJ
-2.43 kJ
1.22 kJ
0 kJ
1

The \( K_{sp} \) of \( \ce{AgBr} \) is \( 5.0 \times 10^{-13} \). What is its solubility in 0.01 M \( \ce{NaBr} \)?

\( K_{sp} = [\ce{Ag+}][\ce{Br-}] \), \( [\ce{Br-}] = 0.01 \), \( 5.0 \times 10^{-13} = S \cdot 0.01 \).

\( S = 5.0 \times 10^{-11} \) M.

\( 7.1 \times 10^{-7} \) M
\( 2.5 \times 10^{-12} \) M
\( 5.0 \times 10^{-13} \) M
\( 5.0 \times 10^{-11} \) M
3

Which compound exhibits functional isomerism with \( \ce{CH3CH2CHO} \)?

\( \ce{CH3CH2CHO} \) (propanal, an aldehyde) has the formula \( \ce{C3H6O} \). \( \ce{CH3COCH3} \) (acetone, a ketone) has the same formula but a different functional group.

\( \ce{CH3CH2CH2OH} \)
\( \ce{CH3CH=CH2} \)
\( \ce{CH2=CHCH2OH} \)
\( \ce{CH3COCH3} \)
4

Which of the following amines has the nitrogen atom with the greatest lone pair availability for protonation?

In \( \ce{(CH3)2NH} \), the lone pair is enhanced by the inductive effect of two methyl groups and not delocalized (unlike aniline), making it highly available for protonation.

\( \ce{(CH3)2NH} \)
\( \ce{C6H5NH2} \)
\( \ce{NH3} \)
\( \ce{CH3NHCH2CH3} \)
1

Which complex has an octahedral coordination polyhedron?

\( \ce{[Fe(CN)6]^{3-}} \) has 6 \( \ce{CN^-} \) ligands around Fe³⁺, forming an octahedral geometry, unlike the tetrahedral or square planar options.

\( \ce{[Fe(CN)6]^{3-}} \)
\( \ce{[NiCl4]^{2-}} \)
\( \ce{[PtCl4]^{2-}} \)
\( \ce{[MnBr4]^{2-}} \)
1

Which of the following is a suitable method for preparing diethyl ether?

Diethyl ether is prepared by Williamson synthesis, where an alkoxide reacts with an alkyl halide.

Hydroboration-oxidation
Williamson synthesis
Dehydration of alcohols
Reaction of ethers with Grignard reagents
2

Which of the following ions has a \( 3d^4 \) configuration?

Cr (Z = 24) has \( 3d^5 4s^1 \). \( \ce{Cr^{2+}} \) loses 4s and 1 from 3d, leaving \( 3d^4 \).

\( \ce{Cr^{2+}} \)
\( \ce{Mn^{2+}} \)
\( \ce{Fe^{2+}} \)
\( \ce{Co^{2+}} \)
1

Which of the following elements is most likely to gain electrons to form a stable anion?

Iodine (I), with \(5s^2 5p^5\), gains one electron to form \(I^-\) with a stable \(5s^2 5p^6\) configuration.

Mg
Al
Si
I
4

What is the overall reaction in a lead storage battery during discharge?

Anode: \( \ce{Pb + SO4^2- -> PbSO4 + 2e-} \).

Cathode: \( \ce{PbO2 + SO4^2- + 4H+ + 2e- -> PbSO4 + 2H2O} \).

Overall: \( \ce{Pb + PbO2 + 2H2SO4 -> 2PbSO4 + 2H2O} \).

Pb + PbO₂ → 2PbO + H₂
PbSO₄ + H₂O → Pb + H₂SO₄
Pb + 2H₂SO₄ → PbSO₄ + H₂
Pb + PbO₂ + 2H₂SO₄ → 2PbSO₄ + 2H₂O
4

For \( \ce{N2O4(g) <=> 2NO2(g)} \), adding an inert gas at constant pressure will:

At constant pressure, adding an inert gas increases volume, shifting equilibrium to products (more moles).

Shift to reactants
Shift to products
No effect
Decrease \( K_p \)
2

Calculate the boiling point elevation of a solution containing 7.2 g of glucose (\( \ce{C6H12O6} \)) in 300 g of water. (\( K_b = 0.52 \, \text{K kg/mol}, \text{Molar mass of glucose} = 180 \, \text{g/mol} \))

Moles of glucose = \( \frac{7.2}{180} = 0.04 \, \text{mol} \).

Molality = \( \frac{0.04}{0.3} = 0.133 \, \text{mol/kg} \).

\( \Delta T_b = 0.52 \times 0.133 = 0.069 \, \text{K} \).

0.035 K
0.069 K
0.138 K
0.208 K
2

Which complex shows geometrical isomerism?

\( \ce{[Co(NH3)4Cl2]+} \) is octahedral and can form cis and trans isomers due to two \( \ce{Cl^-} \) ligands.

\( \ce{[Co(NH3)6]^{3+}} \)
\( \ce{[NiCl4]^{2-}} \)
\( \ce{[Fe(CN)6]^{4-}} \)
\( \ce{[Co(NH3)4Cl2]+} \)
4

Which compound is used as a fire extinguishing agent?

Carbon tetrachloride (\( \ce{CCl4} \)) has been used in some fire extinguishers due to its non-flammable nature.

Chloroform
Carbon tetrachloride
Freon
Iodoform
2

What is the total number of electrons shared between carbon and oxygen in the \( \ce{CO2} \) molecule?

In \( \ce{CO2} \), carbon forms two double bonds with two oxygen atoms. Each double bond involves 4 electrons, so total = 4 + 4 = 8.

8
4
6
10
1

Which of the following compounds undergoes halogenation via a free radical mechanism?

Alkanes undergo halogenation through a free radical mechanism in the presence of light or heat.

Alkanes
Alkenes
Alkynes
Aromatic hydrocarbons
1

What is the potential of a hydrogen electrode in a solution with pH = 5 at 298 K, given \( E^0 = 0 \, \text{V} \)?

For \( \ce{H+ + e- -> 1/2 H2} \), \( E = E^0 - \frac{0.059}{1} \log \frac{1}{[\text{H}^+]} \).

\( [\text{H}^+] = 10^{-5} \), \( E = 0 - 0.059 \times 5 = -0.295 \, \text{V} \).

-0.147 V
-0.295 V
0.147 V
0.295 V
2

Which of the following has a resonance hybrid with two equivalent structures?

\( \ce{O3} \) has two equivalent resonance structures, each with one double and one single bond, delocalizing the electrons.

\( \ce{H2O} \)
\( \ce{NH3} \)
\( \ce{CH4} \)
\( \ce{O3} \)
4

Which of the following compounds will give an orange precipitate with 2,4-DNP reagent?

2,4-Dinitrophenylhydrazine (2,4-DNP) reacts with aldehydes and ketones to form an orange or yellow precipitate.

Methanol
Benzophenone
Acetic acid
Phenol
2

Which of the following 3d series elements has the highest first ionization enthalpy?

Zinc (Zn, Z = 30) has the highest first ionization enthalpy (906 kJ/mol) due to its stable \( 3d^{10} 4s^2 \) configuration.

Fe
Zn
Cu
Ni
2

For the reaction \(\ce{1/2O2(g) + 1/2N2(g) -> NO(g)}\), if \(\Delta_f H^\circ\) of NO(g) is 90.25 kJ/mol, what is \(\Delta_r H\)?

\(\Delta_r H = [90.25] - [0 + 0] = 90.25 kJ/mol\).

-90.25 kJ/mol
180.5 kJ/mol
90.25 kJ/mol
0 kJ/mol
3

Which of the following compounds contains a carbon atom with three sigma bonds and one pi bond?

In \( \ce{CH2=CH2} \), each carbon forms a double bond (1 sigma, 1 pi) with another carbon and two single bonds (2 sigma) with hydrogens, totaling 3 sigma and 1 pi bond, indicating \( sp^2 \) hybridization.

\( \ce{CH2=CH2} \)
\( \ce{CH3CH3} \)
\( \ce{CH3C#CH} \)
\( \ce{CH3CH2OH} \)
1

Which enzyme synthesizes RNA from a DNA template?

RNA polymerase catalyzes transcription, synthesizing RNA by reading the DNA template strand in the 3’ to 5’ direction.

RNA polymerase
DNA polymerase
Helicase
Ligase
1

What is the product of the reaction of phenol with bromine water?

Phenol reacts with bromine water to form 2,4,6-tribromophenol, which precipitates as a white solid.

o-Bromophenol
p-Bromophenol
2,4,6-Tribromophenol
Benzyl alcohol
3

The initial rate of a reaction is \( 1.8 \times 10^{-3} \, \ce{mol L^{-1} s^{-1}} \) when [A] = 0.2 M and [B] = 0.3 M. If the rate law is \( \ce{Rate = k[A]^2[B]} \), what is \( k \) in \( \ce{L^2 mol^{-2} s^{-1}} \)?

\( k = \frac{\text{Rate}}{[\ce{A}]^2[\ce{B}]} = \frac{1.8 \times 10^{-3}}{(0.2)^2 \times 0.3} = \frac{1.8 \times 10^{-3}}{0.012} = 0.15 \).

0.10
0.20
0.15
0.25
3

Which of the following reactions is an example of electrophilic substitution?

Halogenation, nitration, and sulphonation of benzene are electrophilic substitution reactions.

Friedel-Crafts alkylation
Dehydrohalogenation
Hydrolysis
Finkelstein reaction
1

What is the common name of \( \ce{CH3CH2OCH2CH3} \)?

\( \ce{CH3CH2OCH2CH3} \), an ether with two ethyl groups, is commonly known as diethyl ether.

Methyl ethyl ether
Diethyl ether
Ethyl propyl ether
Dimethyl ether
2

Which amine produces an insoluble product with benzenesulphonyl chloride in the Hinsberg test?

Secondary amines like \( \ce{(CH3CH2)2NH} \) form sulphonamides with benzenesulphonyl chloride that lack an acidic hydrogen, making them insoluble in alkali.

\( \ce{CH3CH2NH2} \)
\( \ce{(CH3CH2)2NH} \)
\( \ce{(CH3CH2)3N} \)
\( \ce{C6H5NH2} \)
2

For \( \ce{H2(g) + CO2(g) <=> H2O(g) + CO(g)} \), removing \( \ce{H2O} \) will:

Removing \( \ce{H2O} \) shifts equilibrium to the right to produce more \( \ce{H2O} \) and \( \ce{CO} \).

Shift to products
Shift to reactants
Decrease \( K_p \)
No effect
1

What is the approximate ratio of the radius of an atom to its nucleus?

Rutherford’s model states the atomic radius is about \(10^{-10}\) m and the nuclear radius is \(10^{-15}\) m, giving a ratio of \(10^{-10} / 10^{-15} = 10^5\).

\(10^5\)
\(10^3\)
\(10^7\)
\(10^2\)
1

Which of the following aldehydes undergoes the Cannizzaro reaction?

The Cannizzaro reaction occurs in aldehydes that lack α-hydrogen atoms. Benzaldehyde does not have an α-hydrogen, so it undergoes this reaction.

Acetaldehyde
Benzaldehyde
Propanal
Butanal
2

The general outer electronic configuration of transition elements is:

d-block elements (Groups 3-12) have the configuration (n-1)d¹⁻¹⁰ns⁰⁻², reflecting filling of d-orbitals.

ns²np¹⁻⁶
(n-1)d¹⁻¹⁰ns⁰⁻²
(n-2)f¹⁻¹⁴ns²
ns¹
2

How many optical isomers are possible for \( \ce{[PtCl2(en)2]^{2+}} \)?

The cis isomer of \( \ce{[PtCl2(en)2]^{2+}} \) (square planar) is chiral due to two bidentate \( \ce{en} \) ligands, forming 2 optical isomers (d and l).

1
2
3
0
2

The vapor pressure of pure water at 298 K is 23.8 mm Hg. What is the vapor pressure of a solution containing 18 g of sucrose (\( \ce{C12H22O11} \)) in 162 g of water? (Molar mass: \( \ce{C12H22O11} = 342 \, \text{g/mol} \))

Moles of sucrose = \( \frac{18}{342} = 0.0526 \, \text{mol} \).

Moles of water = \( \frac{162}{18} = 9 \, \text{mol} \).

Mole fraction of water = \( \frac{9}{9 + 0.0526} = 0.994 \).

Vapor pressure = \( 0.994 \times 23.8 = 23.66 \, \text{mm Hg} \).

23.8 mm Hg
23.66 mm Hg
22.50 mm Hg
24.00 mm Hg
2

What is the mass percentage of sulfur in Na₂S? (Atomic masses: Na = 23, S = 32)

Molar mass = (2 × 23) + 32 = 46 + 32 = 78 g/mol.

Mass of S = 32 g.

% S = (32 / 78) × 100 ≈ 41.03%.

41.03%
40%
42%
45%
1

For the reaction \( \ce{2P + Q -> 3R} \), the rate of disappearance of Q is \( 1.5 \times 10^{-3} \, \ce{mol L^{-1} s^{-1}} \). What is the rate of formation of R?

Rate = \( -\frac{1}{2} \frac{\Delta[\ce{P}]}{\Delta t} = -\frac{\Delta[\ce{Q}]}{\Delta t} = \frac{1}{3} \frac{\Delta[\ce{R}]}{\Delta t} \).

\( -\frac{\Delta[\ce{Q}]}{\Delta t} = 1.5 \times 10^{-3} \), so \( \frac{\Delta[\ce{R}]}{\Delta t} = 3 \times 1.5 \times 10^{-3} = 4.5 \times 10^{-3} \).

\( 1.5 \times 10^{-3} \)
\( 4.5 \times 10^{-3} \)
\( 3.0 \times 10^{-3} \)
\( 6.0 \times 10^{-3} \)
2

What is the formal charge on the carbon atom in the \( \ce{CO3^2-} \) ion in one of its resonance structures?

In one resonance structure of \( \ce{CO3^2-} \), carbon has 1 double bond (4 electrons) and 2 single bonds (4 electrons). Formal charge = 4 - 0 - \( \frac{1}{2} \times 8 \) = 0.

+1
0
-1
+2
2

Which compound is obtained when benzaldehyde is treated with Fehling’s solution?

Benzaldehyde does not give Fehling’s test as it cannot reduce Fehling’s solution.

Benzoic acid
Benzyl alcohol
No reaction
Sodium benzoate
3

Which of the following methods is used for the industrial preparation of ethyne?

Ethyne is industrially prepared by treating calcium carbide with water.

Wurtz reaction
Dehydrohalogenation
Hydrolysis of calcium carbide
Friedel-Crafts reaction
3

The ionic radius of \( \ce{Cr^{3+}} \) in the 3d series is approximately:

From the PDF, the ionic radius of \( \ce{Cr^{3+}} \) is 62 pm, decreasing across the series due to increased nuclear charge.

73 pm
65 pm
62 pm
70 pm
3

How many grams of \( \ce{NO} \) are produced from 63 g of \( \ce{HNO3} \) in \( \ce{3HNO3 + P -> H3PO3 + 3NO} \)? (Molar masses: HNO3 = 63, NO = 30)

Moles of \( \ce{HNO3} = 63 / 63 = 1 \). 3 moles \( \ce{HNO3} \) produce 3 moles \( \ce{NO} \), so 1 mole produces 1 mole = \( 1 \times 30 = 30 \) g.

15 g
45 g
20 g
30 g
3

Botany

Which taxonomic approach utilizes chromosome structure, number, and behavior for classification?

Numerical taxonomy
Cytotaxonomy
Chemotaxonomy
Artificial taxonomy
2

Cytotaxonomy uses cytological information such as chromosome number, structure, and behavior to classify organisms.

Which of the following statements about the C3 cycle is incorrect?

It takes place in the stroma of chloroplasts.
3-PGA is the first stable product.
It requires ATP and NADPH.
Carbon fixation occurs in bundle sheath cells.
4

In the C3 cycle, carbon fixation occurs in mesophyll cells, not in bundle sheath cells.

What is the key feature of diplotene in meiosis I?

Chromosome condensation
Synapsis of homologous chromosomes
Separation of homologous chromosomes except at chiasmata
Formation of the mitotic spindle
3

In diplotene, homologous chromosomes start separating but remain attached at chiasmata where crossing over occurred.

Which of the following elements regulates the expression of genes by binding to specific sequences in DNA?

Enhancers
Introns
Exons
Poly-A tail
1

Enhancers are regulatory sequences that bind transcription factors to increase gene expression.

Which type of vascular bundle is commonly found in roots?

Conjoint
Radial
Closed
Bicollateral
2

Radial vascular bundles are found in roots, where xylem and phloem are arranged separately along different radii.

Which type of mutation results in the addition or deletion of a nucleotide, shifting the reading frame?

Point mutation
Frameshift mutation
Silent mutation
Missense mutation
2

A frameshift mutation occurs when nucleotide insertions or deletions shift the genetic reading frame.

Which of the following microbes is involved in the nitrogen-fixation process?

Rhizobium
Saccharomyces cerevisiae
Pseudomonas
Penicillium
1

Rhizobium is a symbiotic nitrogen-fixing bacterium that forms nodules on leguminous plant roots.

Which of the following statements about dominant and recessive traits is incorrect?

A dominant allele expresses its trait in both homozygous and heterozygous conditions.
A recessive allele expresses its trait only in the homozygous condition.
Dominant traits are always more common in a population than recessive traits.
Recessive traits can be passed on through generations without being expressed.
3

Dominant traits are not necessarily more common; frequency depends on factors like natural selection and genetic drift.

Which of the following statements about fungi is correct?

Fungi have cell walls made of chitin.
Fungi are exclusively autotrophic.
Fungi store carbohydrates as starch.
Fungi reproduce only through sexual reproduction.
1

Fungi have cell walls made of chitin, unlike plants, which have cellulose-based cell walls.

Which plastid is responsible for giving fruits and flowers their characteristic colors?

Chloroplast
Leucoplast
Chromoplast
Amyloplast
3

Chromoplasts contain carotenoid pigments that provide yellow, orange, and red colors to fruits and flowers.

Which of the following statements about chloroplasts is incorrect?

Chloroplasts are present in plant cells.
Chloroplasts contain 70S ribosomes.
Chloroplasts store starch.
Chloroplasts are the site of cellular respiration.
4

Chloroplasts are the site of photosynthesis, not cellular respiration.

Which of the following statements about the genetic code is incorrect?

The genetic code is triplet in nature.
Each codon codes for multiple amino acids.
The genetic code is universal.
The genetic code is non-overlapping.
2

Each codon codes for **only one specific amino acid**, not multiple amino acids.

Which of the following is incorrect about prokaryotic transcription?

Prokaryotic transcription occurs in the cytoplasm.
RNA polymerase in prokaryotes requires a sigma factor for initiation.
Prokaryotic mRNA undergoes extensive post-transcriptional modifications.
Transcription and translation can occur simultaneously in prokaryotes.
3

Prokaryotic mRNA **does not undergo extensive post-transcriptional modifications** like splicing, unlike eukaryotic mRNA.

Which of the following statements about meiosis II is correct?

Meiosis II reduces the chromosome number
Meiosis II involves separation of homologous chromosomes
Meiosis II resembles mitosis
Meiosis II produces diploid daughter cells
3

Meiosis II is similar to mitosis in that sister chromatids separate, but it does not reduce the chromosome number further.

Select the correct statement about plant growth:

Growth in plants is reversible.
Growth results from cell division and cell enlargement.
Primary growth increases the thickness of plants.
Secondary growth is observed in monocots.
2

Plant growth is irreversible and results from cell division and enlargement. Primary growth increases length, while secondary growth increases thickness and is common in dicots, not monocots.

Which of the following factors can reduce competition among species in an ecosystem?

Habitat destruction
Resource partitioning
Increased population density
Decreased biodiversity
2

Resource partitioning allows species to utilize different parts of a resource, reducing direct competition.

Which intermediate of glycolysis is formed by the phosphorylation of glucose?

Fructose-1,6-bisphosphate
Glucose-6-phosphate
Dihydroxyacetone phosphate
Pyruvic acid
2

Glucose-6-phosphate is formed when glucose is phosphorylated in the first step of glycolysis.

Which molecule is the final electron acceptor in the light-dependent reactions of photosynthesis?

Oxygen
RuBP
NADP+
Water
3

NADP+ accepts electrons at the end of the light reactions, forming NADPH.

Which of the following statements about monocot leaves is incorrect?

Monocot leaves have parallel venation.
Bulliform cells help in leaf rolling during water stress.
Mesophyll in monocot leaves is differentiated into palisade and spongy layers.
Monocot leaves have stomata on both surfaces.
3

In monocot leaves, mesophyll is not differentiated into palisade and spongy parenchyma, unlike dicot leaves.

Which of the following is a correct statement about biodiversity hotspots?

Biodiversity hotspots contain high levels of endemism.
Biodiversity hotspots have low species richness.
Biodiversity hotspots are found only in polar regions.
Biodiversity hotspots do not require conservation efforts.
1

Biodiversity hotspots are regions with high species richness and a significant number of endemic species, making them crucial for conservation.

Which of the following disorders is caused by a mutation in the gene coding for the enzyme phenylalanine hydroxylase?

Sickle-cell anemia
Thalassemia
Phenylketonuria
Cystic fibrosis
3

Phenylketonuria (PKU) is caused by a mutation in the gene coding for phenylalanine hydroxylase, leading to the accumulation of phenylalanine.

Which of the following is an incorrect statement about keystone species?

Keystone species have a significant impact on ecosystem stability.
Their removal can cause disruptions in the ecosystem.
Keystone species are always the most abundant in an ecosystem.
Some predators act as keystone species by controlling prey populations.
3

Keystone species are not necessarily the most abundant but play a crucial role in maintaining ecosystem structure.

Which of the following modifications is NOT found in the stem?

Tendrils
Thorns
Tuberous root
Rhizome
3

Tuberous roots are a modification of roots, not stems. Examples include sweet potato.

What is the role of decomposers in the nitrogen cycle?

They fix atmospheric nitrogen
They convert nitrates into nitrogen gas
They release nitrogen from organic matter into the soil
They absorb nitrogen from the air
3

Decomposers release nitrogen from dead organisms and organic matter into the soil, making it available for plants.

Which of the following structures secretes chemical attractants (LURE peptides) to guide the pollen tube in the embryo sac?

Egg cell
Synergid cells
Central cell
Antipodal cells
2

Synergid cells in the embryo sac secrete LURE peptides that attract the pollen tube toward the egg apparatus.

Which of the following is incorrect about metaphase?

Chromosomes align at the metaphase plate
Spindle fibers attach to kinetochores
Sister chromatids separate during metaphase
Metaphase is an important stage for karyotyping
3

Sister chromatids do not separate in metaphase; they separate during anaphase.

Which of the following statements about seeds is correct?

The radicle develops into the root
The plumule gives rise to the root
The cotyledons store food in monocots
Monocot seeds have two cotyledons
1

The radicle develops into the root, while the plumule forms the shoot.

Which factor is most likely to enhance cross-pollination in flowering plants?

Structural adaptation that prevents self-pollination
Production of clonal, genetically identical seeds
The absence of pollinator attraction mechanisms
High levels of self-compatibility
1

Structural and biochemical adaptations that prevent self-pollination promote cross-pollination, thereby increasing genetic diversity.

Which of the following is an example of a polytypic genus?

Homo
Panthera
Felis
All of the above
4

Polytypic genera like Homo, Panthera, and Felis contain multiple species within the same genus.

Which type of venation is characteristic of dicot leaves?

Parallel venation
Reticulate venation
Spiral venation
None of the above
2

Dicot leaves typically exhibit reticulate venation, where veins form a network-like pattern.

Which of the following factors contributes most to habitat loss?

Agricultural expansion
Genetic mutation
Species migration
Geological activity
1

Agricultural expansion is a major cause of habitat destruction, leading to biodiversity loss.

Which of the following best describes the function of a promoter?

It binds the ribosome to initiate translation
It regulates DNA replication
It acts as the binding site for RNA polymerase
It terminates transcription
3

The promoter is a DNA sequence that binds RNA polymerase to initiate transcription.

What is the estimated total number of species yet to be discovered on Earth?

1 million
3 million
6 million
10 million
3

Scientists estimate that around 6 million species are yet to be discovered and described.

Which of the following statements about gynoecium is correct?

It is the male reproductive organ
It consists of stamens
It consists of carpels
It produces pollen grains
3

The gynoecium is the female reproductive organ of the flower and consists of carpels.

Select the correct statement regarding plant plasticity:

Plasticity is the ability to produce different types of fruits.
Heterophylly is an example of plasticity.
Plasticity refers to permanent genetic changes.
Plasticity prevents developmental changes in plants.
2

Heterophylly, the presence of different leaf types in the same plant (e.g., coriander), is an example of developmental plasticity.

What is the total net ATP gain from one molecule of glucose in aerobic respiration?

2 ATP
4 ATP
32 ATP
38 ATP
4

A total of 38 ATP molecules are produced per glucose molecule in aerobic respiration.

What is the function of the poly-A tail in eukaryotic mRNA?

It helps in ribosome binding
It protects mRNA from degradation
It plays a role in DNA replication
It assists in protein folding
2

The poly-A tail protects eukaryotic mRNA from degradation and aids in translation.

Which enzyme catalyzes the first step of the Calvin cycle?

RuBisCO
ATP synthase
PEP carboxylase
NADP reductase
1

RuBisCO catalyzes the first step of the Calvin cycle, fixing CO₂ to RuBP.

Which type of genetic disorder is caused by the presence of an extra chromosome 21?

Turner’s syndrome
Klinefelter’s syndrome
Down’s syndrome
Edward’s syndrome
3

Down’s syndrome is caused by trisomy of chromosome 21, leading to developmental and cognitive impairments.

What is the primary function of mitochondria?

Protein synthesis
Energy production
Lipid storage
Cell division
2

Mitochondria generate ATP through aerobic respiration, making them the powerhouse of the cell.

Which of the following best describes the function of heterocysts in cyanobacteria?

Photosynthesis
Nitrogen fixation
Reproduction
Movement
2

Heterocysts in cyanobacteria like Nostoc and Anabaena are specialized cells for nitrogen fixation.

Which of the following is a correct statement about invasive species?

Invasive species can disrupt native ecosystems.
Invasive species always increase biodiversity.
Invasive species never affect ecosystem balance.
Invasive species are beneficial to all ecosystems.
1

Invasive species can outcompete native species, alter habitats, and disrupt ecosystem functions.

Which of the following is an incorrect statement about the chromosomal theory of inheritance?

It was proposed by Sutton and Boveri.
It states that genes are located on chromosomes.
It suggests that alleles segregate independently during meiosis.
It was developed based on Mendel’s experiments on fruit flies.
4

The chromosomal theory of inheritance was based on Mendel’s work on pea plants, not fruit flies.

Which of the following is correct about RNA polymerase in eukaryotic transcription?

RNA polymerase I transcribes mRNA.
RNA polymerase II synthesizes rRNA.
RNA polymerase III transcribes tRNA.
RNA polymerase requires a primer to initiate transcription.
3

RNA polymerase III is responsible for transcribing **tRNA and some small RNAs** in eukaryotes.

Which of the following statements about flower symmetry is correct?

Zygomorphic flowers can be divided into two equal halves only in one plane
Actinomorphic flowers exhibit bilateral symmetry
Pea flowers exhibit actinomorphic symmetry
Sunflower flowers exhibit zygomorphic symmetry
1

Zygomorphic flowers, such as those of pea, can be divided into equal halves in only one vertical plane.

Zoology

Which regulatory body in India oversees research and safety of genetically modified organisms?

ICMR
GEAC
CSIR
ICAR
2

The Genetic Engineering Approval Committee (GEAC) oversees research, approval, and safety of genetically modified organisms in India.

Which of the following diseases is caused by a protozoan?

Typhoid
Tuberculosis
Malaria
Pneumonia
3

Malaria is caused by Plasmodium, a protozoan transmitted by female Anopheles mosquitoes.

Which of the following bones is a part of the pectoral girdle?

Humerus
Scapula
Femur
Tibia
2

The scapula (shoulder blade) is part of the pectoral girdle, which connects the upper limb to the axial skeleton.

Which protein is most abundant in the human body?

Actin
Collagen
Hemoglobin
Keratin
2

Collagen is the most abundant protein in the human body, providing structural support to connective tissues.

Which enzyme catalyzes the breakdown of hydrogen peroxide into water and oxygen?

Amylase
Peroxidase
Lipase
Hexokinase
2

Peroxidase is an enzyme that catalyzes the decomposition of hydrogen peroxide into water and oxygen.

Which disease is treated using gene therapy with the insertion of ADA gene?

Cystic fibrosis
Sickle cell anemia
Adenosine deaminase deficiency
Hemophilia
3

Gene therapy is used to treat adenosine deaminase (ADA) deficiency by inserting a functional ADA gene.

Which of the following experiments demonstrated the synthesis of organic molecules under primitive Earth conditions?

Pasteur’s Swan Neck Flask Experiment
Miller-Urey Experiment
Hardy-Weinberg Principle
Griffith’s Transformation Experiment
2

The Miller-Urey experiment simulated early Earth conditions and led to the formation of organic molecules like amino acids.

Which hormone stimulates the contraction of the uterus during childbirth?

Progesterone
Oxytocin
Prolactin
Estrogen
2

Oxytocin, secreted by the posterior pituitary, stimulates uterine contractions during childbirth.

Which of the following is the primary function of the radula in Mollusca?

Reproduction
Excretion
Locomotion
Feeding
4

The radula is a rasping, file-like structure in mollusks used for scraping and ingesting food.

Which of the following is a characteristic feature of arthropods?

Water vascular system
Jointed appendages
Parapodia
Flame cells
2

Arthropods are characterized by jointed appendages, an exoskeleton, and segmented bodies.

Which structure in frogs receives blood from the body and directs it to the right atrium?

Sinus venosus
Conus arteriosus
Ventricle
Pulmonary veins
1

The sinus venosus is a triangular structure that receives deoxygenated blood from the body and directs it to the right atrium.

Which of the following pathogens is transmitted by houseflies?

Plasmodium
Entamoeba histolytica
Wuchereria bancrofti
HIV
2

Houseflies act as mechanical carriers for Entamoeba histolytica, transmitting amoebiasis through contaminated food and water.

Which structure in the human respiratory system acts as a protective barrier against foreign particles?

Alveoli
Epiglottis
Nasal chamber
Diaphragm
3

The nasal chamber filters out dust, microbes, and other foreign particles from inhaled air before it reaches the lungs.

Which excretory structure is present in Planaria (flatworms)?

Nephridia
Malpighian tubules
Flame cells
Green glands
3

Flame cells are the excretory structures in Planaria and other flatworms, playing a role in osmoregulation.

Which of the following statements about sexually transmitted infections (STIs) is correct?

STIs are always detected in the early stages.
HIV can be transmitted through infected needles.
STIs only affect the reproductive system.
STIs cannot be prevented by using contraceptives.
2

HIV can be transmitted through infected needles, blood transfusion, and from mother to child during childbirth.

Which of the following statements about frog locomotion is correct?

Frogs have powerful hind limbs adapted for jumping.
Forelimbs are longer than hind limbs to help with movement.
Frogs use only their front limbs for swimming.
Frogs cannot move on land.
1

Frogs have strong, muscular hind limbs that help them jump on land and swim in water.

Which of the following statements about veins is incorrect?

Veins carry blood toward the heart.
Veins always carry deoxygenated blood.
Veins have valves to prevent backflow of blood.
Veins have thinner walls than arteries.
2

Not all veins carry deoxygenated blood. **Pulmonary veins** carry **oxygenated blood** from the lungs to the heart.

Which recombinant DNA product is used for treating growth hormone deficiency?

Insulin
Somatotropin
Interferon
Thyroxine
2

Recombinant human growth hormone (somatotropin) is used to treat growth hormone deficiency.

Which type of enzyme seals the DNA fragments after cutting?

DNA helicase
DNA polymerase
DNA ligase
Exonuclease
3

DNA ligase joins the cut DNA fragments by forming phosphodiester bonds between them.

Which enzyme is used to produce sticky ends in a DNA fragment?

DNA ligase
Reverse transcriptase
Restriction endonuclease
Helicase
3

Restriction endonucleases cut DNA at specific sequences, generating sticky ends for recombination.

Which condition in males is characterized by the abnormal dilation of the pampiniform plexus within the scrotum?

Varicocele
Hydrocele
Epididymitis
Orchitis
1

Varicocele is the condition where the veins within the pampiniform plexus become enlarged, often affecting sperm quality and fertility.

Which of the following statements about innate immunity is correct?

Innate immunity involves memory cell formation.
Innate immunity provides immediate defense.
Innate immunity is specific to particular pathogens.
Innate immunity is acquired after birth.
2

Innate immunity is a non-specific defense mechanism that provides immediate protection against pathogens.

Which ion is mainly responsible for maintaining the resting membrane potential in neurons?

Sodium (Na⁺)
Calcium (Ca²⁺)
Potassium (K⁺)
Chloride (Cl⁻)
3

Potassium ions (K⁺) play a key role in maintaining the resting membrane potential by being more permeable than sodium ions.

Which of the following statements about phospholipids is correct?

Phospholipids are major components of cell membranes.
Phospholipids have hydrophilic tails and hydrophobic heads.
Phospholipids contain peptide bonds.
Phospholipids store genetic information.
1

Phospholipids are a key structural component of cell membranes, forming the lipid bilayer.

Which enzyme is responsible for catalyzing the conversion of carbon dioxide and water into carbonic acid?

Pepsin
Amylase
Carbonic anhydrase
Lipase
3

Carbonic anhydrase catalyzes the conversion of carbon dioxide and water into carbonic acid.

Which hormone is secreted by the pancreas and acts to increase blood glucose levels?

Glucagon
Insulin
Somatostatin
Cortisol
1

Glucagon, secreted by the pancreas, increases blood glucose levels by promoting glycogen breakdown.

Which of the following is a non-steroidal oral contraceptive pill developed in India?

Mifepristone
Saheli
Plan B
Norplant
2

Saheli is a non-steroidal oral contraceptive pill developed by CDRI, Lucknow, India.

Which type of cells are responsible for long-term immunity?

Plasma cells
Neutrophils
Memory cells
Macrophages
3

Memory B-cells and T-cells retain information about pathogens and provide long-term immunity.

Which of the following statements about arteries is correct?

Arteries always carry oxygenated blood.
Arteries have thick muscular walls to withstand high pressure.
Arteries transport blood toward the heart.
Arteries have valves to prevent backflow of blood.
2

**Arteries have thick muscular walls** to withstand **high blood pressure** exerted by the pumping action of the heart.

Which of the following events marks the initiation of the luteal phase in the menstrual cycle?

Menstruation
Ovulation
Follicular phase
Proliferative phase
2

Ovulation triggers the transition from the follicular phase to the luteal phase, during which the corpus luteum forms.

What is the normal glomerular filtration rate (GFR) in a healthy human?

50 mL/min
100 mL/min
125 mL/min
200 mL/min
3

The normal GFR in a healthy individual is approximately 125 mL/min, which equals about 180 liters per day.

Which of the following animals uses book lungs for respiration?

Cockroach
Spider
Earthworm
Fish
2

Spiders and scorpions (Arachnida) possess book lungs for respiration, which are made up of thin, leaf-like structures.

Which of the following is incorrect?

Fossils provide direct evidence of evolution.
Gene flow introduces new alleles into a population.
Analogous organs have similar structures but different functions.
Mutation introduces genetic variation in populations.
3

Analogous organs have similar functions but different structures and evolutionary origins.

Which of the following features distinguishes deuterostomes from protostomes?

Blastopore develops into the mouth in deuterostomes
Radial and indeterminate cleavage in deuterostomes
Mesoderm forms by schizocoely in deuterostomes
Protostomes include Echinodermata and Chordata
2

Deuterostomes exhibit radial and indeterminate cleavage, and their blastopore develops into the anus. Protostomes show spiral and determinate cleavage.

Which of the following movements is an example of adduction?

Lifting the arm sideways
Bringing the arm towards the body
Bending the knee
Rotating the wrist
2

Adduction is the movement toward the midline of the body​.

Which of the following best explains why carbon dioxide is transported more efficiently than oxygen in the blood?

Carbon dioxide is highly soluble in plasma.
Oxygen binds weakly to hemoglobin.
Carbon dioxide is actively transported by RBCs.
Oxygen is transported primarily as bicarbonate ions.
1

Carbon dioxide is 20-25 times more soluble in plasma than oxygen, which facilitates its efficient transport.

Which of the following statements about DNA ligase is correct?

DNA ligase is used to join DNA fragments by forming phosphodiester bonds.
DNA ligase is responsible for cutting DNA at specific recognition sites.
DNA ligase is not required in recombinant DNA technology.
DNA ligase prevents DNA replication.
1

DNA ligase forms phosphodiester bonds between DNA fragments, sealing nicks in the sugar-phosphate backbone.

Which part of the uterus is shed during menstruation?

Myometrium
Perimetrium
Endometrium
Cervix
3

The endometrium, or the inner lining of the uterus, is shed during menstruation if no implantation occurs.

Which of the following statements is correct?

Analogous organs provide evidence of common ancestry.
Genetic recombination decreases genetic variability in populations.
Mutation introduces new genetic variations into populations.
Lamarck proposed the theory of natural selection.
3

Mutation introduces new genetic variations, which can contribute to evolutionary change.

Which enzyme is used to cut and remove specific DNA fragments during genetic engineering?

DNA polymerase
Ligase
Restriction endonuclease
Helicase
3

Restriction endonucleases are enzymes used to cut DNA at specific recognition sites in genetic engineering.

Which of the following components is essential for maintaining sterility in bioprocess engineering?

High temperature
Sterile conditions
Antibiotic resistance genes
Use of multiple restriction enzymes
2

Maintaining sterile conditions is essential in bioprocess engineering to prevent contamination and ensure the growth of desired microbes.

Which type of selection favors individuals with extreme traits at both ends of the spectrum?

Stabilizing Selection
Directional Selection
Disruptive Selection
Artificial Selection
3

Disruptive selection favors individuals with extreme traits, leading to a bimodal distribution of traits in a population.

Which of the following is a common male factor contributing to infertility?

Azoospermia
Endometriosis
Polycystic Ovarian Syndrome (PCOS)
Hyperprolactinemia
1

Azoospermia, the absence of sperm in the ejaculate, is a significant male factor that can lead to infertility.

Which neurotransmitter is primarily associated with mood regulation and is often linked to depression?

Dopamine
Serotonin
Acetylcholine
GABA
2

Serotonin is involved in mood regulation, and its deficiency is often linked to depression.

Which type of cartilage is found at the ends of long bones in joints?

Fibrocartilage
Elastic cartilage
Hyaline cartilage
Calcified cartilage
3

Hyaline cartilage covers the ends of long bones in joints, providing a smooth surface for movement.

Performance Summary

Subject Correct
Answers		 Incorrect
Answers		 Attempted Skipped Accuracy
Physics
Chemistry
Botany
Zoology

Overall Score

Score: / 720

Category Details
Total Attempts: / 180
Total Skipped: / 180
Total Wrong Answers:
Total Correct Answers:
Time Taken:
Average Time Taken per Question:
0
180