Neet [2024]

Question 1

A bob is whirled in a horizontal plane by means of a string with an initial speed of ω rpm. The tension in the string is T. If speed becomes 2ω while keeping the same radius, the tension in the string becomes:

Accepted Answer

4T

Answer

T

Answer

T/4

Answer

√2T

Question 2

A particle moving with uniform speed in a circular path maintains:

Accepted Answer

varying velocity and varying acceleration

Answer

constant velocity

Answer

constant acceleration

Answer

constant velocity but varying acceleration

Question 3

A logic circuit provides the output Y as per the following truth table:
| A | B | Y |
| 0 | 0 | 1 |
| 0 | 1 | 0 |
| 1 | 0 | 1 |
| 1 | 1 | 0 |
The expression for the output Y is:

Accepted Answer

B

Answer

AB + A

Answer

AB + A

Question 4

In the diagrams, a strong bar magnet is moving towards solenoid-2 from solenoid-1. The direction of induced current in solenoid-1 and that in solenoid-2, respectively, are through the directions:

Accepted Answer

AB and DC

Answer

BA and CD

Answer

AB and CD

Answer

BA and DC

Question 5

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason.
Assertion (A): The potential (V) at any axial point, at 2 m distance (r) from the centre of the dipole of dipole moment vector P of magnitude, 4×10⁻⁶ C m, is ±9×10³ V.
Reason (R): V = ±2P/(4πε₀r²), where r is the distance of any axial point, situated at 2 m from the centre of the dipole.
In the light of the above statements, choose the correct answer from the options given below:

Accepted Answer

A is true but R is false

Answer

Both A and R are true and R is the correct explanation of A

Answer

Both A and R are true and R is NOT the correct explanation of A

Answer

A is false but R is true

Question 6

Match List-I with List-II: List-I (Material) - List-II (Susceptibility (χ)) A. Diamagnetic - I. χ = 0 B. Ferromagnetic - II. 0 > χ ≥ -1 C. Paramagnetic - III. χ >> 1 D. Non-Magnetic - IV. 0 < χ < ε (a small positive number) Choose the correct answer from the options given below:

Accepted Answer

A-II, B-III, C-IV, D-I

Answer

A-II, B-I, C-III, D-IV

Answer

A-III, B-II, C-I, D-IV

Answer

A-IV, B-III, C-II, D-I

Question 7

In a uniform magnetic field of 0.049 T, a magnetic needle performs 20 complete oscillations in 5 seconds. The moment of inertia of the needle is 9.8×10⁻⁶ kg m². If the magnitude of magnetic moment of the needle is x×10⁻⁵ Am²; then the value of x is:

Accepted Answer

1280π²

Answer

5π²

Answer

128π²

Answer

50π²

Question 8

In an ideal transformer, the turns ratio Nₚ/Nₛ = 1/2. The ratio Vₛ:Vₚ is equal to:

Accepted Answer

2:1

Answer

1:2

Answer

1:1

Answer

1:4

Question 9

In a vernier calipers, (N+1) divisions of vernier scale coincide with N divisions of main scale. If 1 MSD represents 0.1 mm, the vernier constant (in cm) is:

Accepted Answer

1/100(N+1)

Answer

1/10N

Answer

100N

Answer

10(N+1)

Question 10

A horizontal force 10 N is applied to a block A as shown in figure. The mass of blocks A and B are 2 kg and 3 kg, respectively. The blocks slide over a frictionless surface. The force exerted by block A on block B is:

Accepted Answer

6 N

Answer

zero

Answer

4 N

Answer

10 N

Question 11

If x = 5sin(πt + π/3) m represents the motion of a particle executing simple harmonic motion, the amplitude and time period of motion respectively, are:

Accepted Answer

5 m, 2 s

Answer

5 cm, 2 s

Answer

5 cm, 1 s

Answer

5 m, 1 s

Question 12

The terminal voltage of the battery, whose emf is 10V and internal resistance 1Ω, when connected through an external resistance of 4Ω is:

Accepted Answer

8V

Answer

4V

Answer

6V

Answer

10V

Question 13

Given below are two statements:
Statement I: Atoms are electrically neutral as they contain equal number of positive and negative charges.
Statement II: Atoms of each element are stable and emit their characteristic spectrum.
In the light of the above statements, choose the most appropriate answer from the options given below:

Accepted Answer

Statement I is correct but Statement II is incorrect

Answer

Both Statement I and Statement II are correct

Answer

Both Statement I and Statement II are incorrect

Answer

Statement I is incorrect but Statement II is correct

Question 14

If c is the velocity of light in free space, the correct statements about photon among the following are:
A. The energy of a photon is E = hν
B. The velocity of a photon is c
C. The momentum of a photon, p = hν/c
D. In a photon-electron collision, both total energy and total momentum are conserved
E. Photon possesses positive charge
Choose the correct answer from the options given below:

Accepted Answer

A, B, C and D only

Answer

A and B only

Answer

A, C and D only

Answer

A, B, D and E only

Question 15

Match List I with List II:
List I (Spectral Lines of Hydrogen for transitions from) - List II (Wavelengths (nm))
A. n₂=3 to n₁=2 - I. 410.2
B. n₂=4 to n₁=2 - II. 434.1
C. n₂=5 to n₁=2 - III. 656.3
D. n₂=6 to n₁=2 - IV. 486.1
Choose the correct answer from the options given below:

Accepted Answer

A-III, B-IV, C-II, D-I

Answer

A-II, B-I, C-IV, D-III

Answer

A-IV, B-III, C-I, D-II

Answer

A-I, B-II, C-III, D-IV

Question 16

A tightly wound 100 turns coil of radius 10 cm carries a current of 7 A. The magnitude of the magnetic field at the centre of the coil is:

Accepted Answer

4.4 mT

Answer

44 mT

Answer

4.4 T

Answer

44 T

Question 17

The output (Y) of the given logic gate is similar to the output of an/a:

Accepted Answer

AND gate

Answer

NAND gate

Answer

NOR gate

Answer

OR gate

Question 18

A wire of length 'l' and resistance 100Ω is divided into 10 equal parts. The first 5 parts are connected in series while the next 5 parts are connected in parallel. The two combinations are again connected in series. The resistance of this final combination is:

Accepted Answer

52Ω

Answer

26Ω

Answer

55Ω

Answer

60Ω

Question 19

In the nuclear emission stated above the mass number and atomic number of the product Q respectively, are:

Accepted Answer

286, 81

Answer

280, 81

Answer

286, 80

Answer

288, 82

Question 20

The maximum elongation of a steel wire of 1m length if the elastic limit of steel and its Young's modulus, respectively, are 8×10⁸ N m⁻² and 2×10¹¹ N m⁻² is:

Accepted Answer

4 mm

Answer

0.4 mm

Answer

40 mm

Answer

8 mm

Question 21

If the monochromatic source in Young's double slit experiment is replaced by white light, then:

Accepted Answer

there will be a central bright white fringe surrounded by a few coloured fringes

Answer

interference pattern will disappear

Answer

there will be a central dark fringe surrounded by a few coloured fringes

Answer

all bright fringes will be of equal width

Question 22

At any instant of time t, the displacement of any particle is given by 2t-1 (SI unit) under the influence of force of 5N. The value of instantaneous power is (in SI unit):

Accepted Answer

10

Answer

5

Answer

7

Answer

6

Question 23

Consider the following statements A and B and identify the correct answer:
A. For a solar-cell, the I-V characteristics lies in the IV quadrant of the given graph
B. In a reverse biased pn junction diode, the current measured in (μA), is due to majority charge carriers

Accepted Answer

A is correct but B is incorrect

Answer

A is incorrect but B is correct

Answer

Both A and B are correct

Answer

Both A and B are incorrect

Question 24

Two bodies A and B of same mass undergo completely inelastic one dimensional collision. The body A moves with velocity v₁ while body B is at rest before collision. The velocity of the system after collision is v₂. The ratio v₁:v₂ is:

Accepted Answer

2:1

Answer

1:2

Answer

4:1

Answer

1:4

Question 25

A light ray enters through a right angled prism at point P with the angle of incidence 30° as shown in figure. It travels through the prism parallel to its base BC and emerges along the face AC. The refractive index of the prism is:

Accepted Answer

√5/2

Answer

√5/4

Answer

√3/4

Answer

√3/2

Question 26

The graph which shows the variation of (1/λ²) and its kinetic energy, E is (where λ is de Broglie wavelength of a free particle):

Accepted Answer

D

Answer

Answer

Answer

Answer

Question 27

The quantities which have the same dimensions as those of solid angle are:

Accepted Answer

strain and angle

Answer

stress and angle

Answer

strain and arc

Answer

angular speed and stress

Question 28

An unpolarised light beam strikes a glass surface at Brewster's angle Then:

Accepted Answer

the reflected light will be completely polarised but the refracted light will be partially polarised

Answer

the reflected light will be partially polarised

Answer

the refracted light will be completely polarised

Answer

both the reflected and refracted light will be completely polarised

Question 29

The moment of inertia of a thin rod about an axis passing through its mid point and perpendicular to the rod is 2400 g cm². The length of the 400 g rod is nearly:

Accepted Answer

8.5 cm

Answer

17.5 cm

Answer

20.7 cm

Answer

72.0 cm

Question 30

A thin flat circular disc of radius 4.5 cm is placed gently over the surface of water. If surface tension of water is 0.07 Nm⁻¹, then the excess force required to take it away from the surface is:

Accepted Answer

19.8 mN

Answer

198 N

Answer

1.98 mN

Answer

99 N

Question 31

A thermodynamic system is taken through the cycle abcda. The work done by the gas along the path bc is:

Accepted Answer

zero

Answer

30 J

Answer

-90 J

Answer

-60 J

Question 32

A wheel of a bullock cart is rolling on a level road as shown in the figure. If its linear speed is v in the direction shown, which one of the following options is correct (P and Q are any highest and lowest points on the wheel, respectively)?

Accepted Answer

Point P moves faster than point Q

Answer

Point P moves slower than point Q

Answer

Both the points P and Q move with equal speed

Answer

Point P has zero speed

Question 33

The mass of a planet is 1/10 that of the earth and its diameter is half that of the earth. The acceleration due to gravity on that planet is:

Accepted Answer

3.92 m/s²

Answer

19.6 m/s²

Answer

9.8 m/s²

Answer

4.9 m/s²

Question 34

In the following circuit, the equivalent capacitance between terminal A and terminal B is:

Accepted Answer

2 μF

Answer

1 μF

Answer

0.5 μF

Answer

4 μF

Question 35

A thin spherical shell is charged by some source. The potential difference between the two points C and P (in V) shown in the figure is:

Accepted Answer

zero

Answer

3×10⁵

Answer

1×10⁵

Answer

0.5×10⁵

Question 36

The velocity (v) - time (t) plot of the motion of a body is shown. The acceleration (a) - time (t) graph that best suits this motion is:

Accepted Answer

C

Answer

Answer

Answer

Answer

Question 37

If the mass of the bob in a simple pendulum is increased to thrice its original mass and its length is made half its original length, then the new time period of oscillation is x/2 times its original time period. Then the value of x is:

Accepted Answer

2

Answer

√3

Answer

2√3

Answer

4

Question 38

A 10 μF capacitor is connected to a 210 V, 50 Hz source. The peak current in the circuit is nearly (π = 3.14):

Accepted Answer

0.93 A

Answer

0.58 A

Answer

1.20 A

Answer

0.35 A

Question 39

The graph represents the T-V curves of an ideal gas at three pressures P₁, P₂ and P₃ compared with those of Charles's law. Then the correct relation is:

Accepted Answer

P₁ > P₂ > P₃

Answer

P₃ > P₂ > P₁

Answer

P₁ > P₃ > P₂

Answer

P₂ > P₁ > P₃

Question 40

An iron bar of length L has magnetic moment M. It is bent at the middle of its length such that the two arms make an angle 60° with each other. The magnetic moment of this new magnet is:

Accepted Answer

M/2

Answer

M

Answer

2M

Answer

M/√3

Question 41

The minimum energy required to launch a satellite of mass m from the surface of earth of mass M and radius R in a circular orbit at an altitude of 2R from the surface of the earth is:

Accepted Answer

5GmM/6R

Answer

2GmM/3R

Answer

GmM/2R

Answer

GmM/3R

Question 42

A parallel plate capacitor is charged by connecting it to a battery through a resistor. If I is the current in the circuit, then in the gap between the plates:

Accepted Answer

displacement current of magnitude equal to I flows in the same direction as I

Answer

there is no current

Answer

displacement current of magnitude equal to I flows in a direction opposite to that of I

Answer

displacement current of magnitude greater than I flows but can be in any direction

Question 43

The property which is not of an electromagnetic wave travelling in free space is that:

Accepted Answer

they originate from charges moving with uniform speed

Answer

they are transverse in nature

Answer

the energy density in electric field is equal to energy density in magnetic field

Answer

they travel with a speed equal to 1/√(μ₀ε₀)

Question 44

A metallic bar of Young's modulus, 0.5×10¹¹ N/m² and coefficient of linear thermal expansion 10⁻⁵ °C⁻¹, length 1 m and area of cross-section 10⁻³ m² is heated from 0°C to 100°C without expansion or bending. The compressive force developed in it is:

Accepted Answer

50×10³ N

Answer

5×10³ N

Answer

100×10³ N

Answer

2×10³ N

Question 45

Choose the correct circuit which can achieve the bridge balance:

Accepted Answer

A

Answer

Answer

Answer

Answer

Question 46

A sheet is placed on a horizontal surface in front of a strong magnetic pole. A force is needed to:
A. hold the sheet there if it is magnetic
B. hold the sheet there if it is non-magnetic
C. move the sheet away from the pole with uniform velocity if it is conducting
D. move the sheet away from the pole with uniform velocity if it is both, non-conducting and non-polar
Choose the correct statement(s) from the options given below:

Accepted Answer

A and C only

Answer

B and D only

Answer

A, C and D only

Answer

C only

Question 47

If the plates of a parallel plate capacitor connected to a battery are moved close to each other, then:
A. the charge stored in it, increases
B. the energy stored in it, decreases
C. its capacitance increases
D. the ratio of charge to its potential remains the same
E. the product of charge and voltage increases
Choose the most appropriate answer from the options given below:

Accepted Answer

A,C and E only

Answer

A,B and E only

Answer

B, D and E only

Answer

A, B and C only

Question 48

Two heaters A and B have power rating of 1 kW and 2 kW, respectively. Those two are first connected in series and then in parallel to a fixed power source. The ratio of power outputs for these two cases is:

Accepted Answer

2:9

Answer

1:1

Answer

1:2

Answer

2:3

Question 49

A small telescope has an objective of focal length 140 cm and an eye piece of focal length 5.0 cm. The magnifying power of telescope for viewing a distant object is:

Accepted Answer

28

Answer

34

Answer

17

Answer

32

Question 50

A force defined by F = αt² + βt acts on a particle at a given time t. The factor which is dimensionless, if α and β are constants, is:

Accepted Answer

αt/β

Answer

βt/α

Answer

αβt

Answer

αβ/t

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