PU CET UG 2025 Question Paper Physics

1. If an electric field is given by 10𝚤̂ + 3𝚥̂ + 4𝑘 , calculate the electric flux through a surface
of area 10 units lying in yz plane
(A) 100 units (B) 10 units (C) 30 units (D) 40 units
2. The S.I unit of electric flux is:
(A) N m-2 C-1 (B) N m2 C-1 (C) Nm2 C (D) Nm-2C
3. Electric flux ɸ through a closed surface enclosing charge q is . What will be the electric

flux through the closed surface if its size is doubled?
(A) (B) (C) (D) Zero

4. A particle A has charge +q and particle B has charge +4q with each of them having the
same mass m. When allowed to fall from rest through the same electric potential
difference, the ratio of their speeds vA/vB will become :
(A) 1 : 2 (B) 2 : 1 (C) 1 : 4 (D) 4 : 1
5. Consider the following two statements :
(a) Kirchhoff's junction law follows from the conservation of charge.
(b) Kirchhoff's loop law follows from the conservation of energy.
Which of the following is correct?
(A) Both (a) and (b) are correct
(B) Both (a) and (b) are wrong
(C) (a) is correct and (b) is wrong
(D) (a) is wrong and (b) is correct
6. A potential difference of 5 V is applied across a conductor of length 10 cm. If drift
velocity of electrons is 2.5 × 10–4 m/s, then electron mobility will be
(A) 5 × 10–4 m2 V–1 s–1 (B) 5 × 10–6 m2 V–1 s–1
(C) 5 × 10–2 m2 V–1 s–1 (D) Zero
7. The correct expression for Lorentz force is
(A) q [E⃗ + (B⃗ x v⃗)] (B) q [E⃗ + (v⃗ x B⃗)]
(C) q (v⃗ x B⃗) (D) qE⃗
8. When a charged particle moving with velocity v⃗ is subjected to a magnetic field of
induction B⃗, the force on it is non-zero. This implies that :
(A) Angle between v⃗ and B⃗ is necessarily 90°
(B) Angle between v⃗ and B⃗ can have any value other than 90°
(C) Angle between v⃗ and B⃗ can have any value other than zero and 180°
(D) Angle between v⃗ and B⃗ is either zero or 180°
9. A beam of electrons is moving with constant velocity in a region having electric and
magnetic fields of strength 20 Vm–1 and 0.5 T at right angles to the direction of motion of
the electrons. What is the velocity of the electrons?
(A) 8 ms–1 (B) 5.5 ms–1 (C) 20 ms–1 (D) 40 ms–1
10. Magnetic susceptibility for a diamagnetic substance is
(A) Large and positive (B) Large and negative
(C) Small and positive (D) Small and negative
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11. Relative permeability of superconductors is
(A) 0 (B) 1 (C) –1 (D) 0.5
12. A coil having number of turns N and area A is rotated in a uniform magnetic field B with
angular velocity ω about its diameter. Maximum e.m.f. induced in it is given by
ω ω
(A) NABω (B) (C) (D)
ω

13. In an LCR series circuit R = 10 Ω, XL = 8 Ω and XC = 6 Ω. The total impedance of the
circuit is
(A) 10 Ω (B) 10.2 Ω (C) 17.2 Ω (D) None of these
14. A step-up transformer operates on 220 V line and supplies 2.2 A. The ratio of primary and
secondary winding is 11 : 50. The output voltage in the secondary is
(A) 220 V (B) 100 V (C) 1000 V (D) Zero
15. The dimensional formula of εo E2 is
(where E = electric field)
(A) [M L T-1] (B) [M L2 T-2] (C) [M L-1 T-2] (D) [M L2 T-1]
16. The decreasing order of wavelength of infrared, microwave, ultraviolet and gamma rays
is
(A) Infrared, microwave, ultraviolet, gamma rays
(B) Microwave, infrared, ultraviolet, gamma rays
(C) Gamma rays, ultraviolet, infrared, microwave
(D) Microwaves, gamma rays, infrared, ultraviolet
17. Maximum magnification produced by simple microscope of focal length f = 5 cm is
(A) 5 (B) 7 (C) 6 (D) 8
18. If in a plano-convex lens, radius of curvature of convex surface is 10 cm and the focal
length of lens is 30 cm, the refractive index of the material of the lens will be
(A) 1.5 (B) 1.66 (C) 1.33 (D) 3
19. A ray is incident on boundary separating glass and water. Refractive index for glass is
and refractive index for water is . The critical angle for glass-air boundary is
(A) sin-1 (B) sin-1 (C) sin-1 (D) sin-1
20. Two waves having intensities in the ratio of 9 : 1 produce interference. The ratio of
maximum to minimum intensity is equal to
(A) 10 : 8 (B) 9 : 1 (C) 4 : 1 (D) 2 : 1
21. In Young’s double slit experiment, the separation between the slits is halved and the
distance between the slits and screen is doubled. The new fringe width is
(A) Unchanged (B) Halved (C) Doubled (D) Quadrupled
22. In Young’s double slit experiment, 12 fringes are obtained in a certain fragment of the
screen, when light of wavelength 600 nm is used. If the wavelength of light is changed to
400 nm, number of fringes observed in the same segment of the screen is
(A) 12 (B) 18 (C) 24 (D) 30
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23. In photoelectric effect, the slope of stopping potential versus frequency of incident light
for a given surface will be
(A) h e-1 (B) e h (C) e (D) h
24. The wavelength of matter waves is independent of
(A) Mass (B) Velocity (C) Momentum (D) Charge
25. A proton and an alpha particle are accelerated through the same potential difference. The
ratio of de Broglie wavelength of the proton to that of the alpha particle will be
(A) 2 : 1 (B) 1 : 1 (C) 1 : 2 (D) 2√2 : 1
26. What is the angular momentum of an electron in Bohr’s hydrogen atom whose energy is
-3.4 eV?
ℎ ℎ ℎ
(A) (B) (C) (D)

27. Using Bohr’s formula for energy quantization, the ionisation potential of the ground state
of Li++ atom is
(A) 122 V (B) 13.6 V (C) 3.4 V (D) 10.2 V
28. In a nuclear fusion reaction, if the energy is released then
(A) BE products = BE reactants (B) BE reactants > BE products
(C) BE products > BE reactants (D) Mass of products > Mass of reactants
29. Ratio of nuclear radii of 135Cs to 40Ca is
(A) 1.40 (B) 1.50 (C) 2.750 (D) 3.375
30. If Fpp , Fpn and Fnn are the magnitudes of nuclear forces between proton-proton, proton-
neutron and neutron-neutron respectively, then
(A) Fpp = Fpn = Fnn (B) Fpp<Fpn = Fnn (C) Fpp>Fpn>Fnn (D) Fpp<Fpn<Fnn
31. In semiconductors, which of the following relations is correct at thermal equilibrium?
(A) ni = ne = nh (B) ni2= nenh (C) ni= (D) ni= ne + nh
ℎ

32. The ratio of the dimensions of Planck’s constant and that of the moment of inertia is the
dimension of
(A) Frequency (B) Velocity (C) Angular momentum (D) Time
33. If magnitude of average speed and average velocity over a time interval are same, then
(A) The particle must move with zero acceleration
(B) The particle must move with non-zero acceleration
(C) The particle must be at rest
(D) The particle must move in a straight line without turning back
34. A car moves with speed 60 km/h for 1 hour in east direction and with same speed for 30
min in south direction. The displacement of car from initial position is
(A) 60 km (B) 30√3 km (C) 30√5 km (D) 60√2 km
35. Two vectors, each of magnitude A have a resultant of same magnitude A. The angle
between the two vectors is
(A) 30o (B) 60o (C) 120o (D) 150o

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36. Two forces of magnitude 8 N and 15 N respectively act at a point. If the resultant force is
17 N, the angle between the forces has to be
(A) 60o (B) 45o (C) 90o (D) 30o
37. A particle projected from origin moves in x-y plane with a velocity 𝑣⃗= 3 ı̂ + 6x ȷ̂, where ı̂
and ȷ̂ are the unit vectors along x and y axis. Find the equation of path followed by the
particle
(A) y = x2 (B) y = (C) y = 2x2 (D) y =

38. If n balls hit elastically and normally on a surface per unit time and all balls of mass m
are moving with the same velocity u, then force on surface is
(A) mun (B) 2 mun (C) mu2n (D) mu2n

39. A bomb of mass 9 kg explodes into two pieces of masses 3 kg and 6 kg. The velocity of
mass 3 kg is 16 m/s. The kinetic energy of mass 6 kg in joule is
(A) 196 (B) 320 (C) 192 (D) 620
40. A body moves a distance of 10 m along a straight line under the action of a force 5 N. If
the work done is 25 joule, the angle which the force makes with the direction of motion
of body is
(A) 0o (B) 30o (C) 60o (D) 90o
41. Two bodies of masses m 1 and m2 have same momentum. The ratio of the kinetic energy
of body of mass m1 to that of mass m2 is
(A) (B) (C) (D)

42. The moment of inertia of a body depends on
(A) The mass of the body (B) The distribution of the mass in the body
(C) The axis of rotation of the body (D) All of these
43. Two point masses m and 3m are placed at distance r. The moment of inertia of the system
about an axis passing through the centre of mass of system and perpendicular to the line
joining the point masses is
(A) mr2 (B) mr2 (C) mr2 (D) mr2

44. The torque on a planet about the centre of sun is
(A) Zero (B) Negative
(C) Positive (D) Depend on mass of planet
45. At what height above the surface of earth the value of ‘g’ decreases by 2%? (radius of
earth is 6400 km)
(A) 32 km (B) 64 km (C) 128 km (D) 1600 km
46. The ratio of radii of two wires of same material is 2 : 1. If these wires are stretched by
equal force, the ratio of stresses produced in them is
(A) 2 : 1 (B) 1 : 2 (C) 1 : 4 (D) 4 : 1

(4)

47. The kerosene oil rises up in the wick of a lamp
(A) Due to high surface tension of oil
(B) Because the wick attracts the oil
(C) Because wick decreases the surface tension of oil
(D) Due to capillaries formed in the wick
48. Soap helps in cleaning clothes, because
(A) It attracts the dirt particles
(B) It decreases the surface tension of water
(C) It increases the cohesive force between water molecules
(D) It increases the angle of contact
49. In engines water is used as coolant, because
(A) It is a good conductor of heat energy (B) It has low density
(C) It has high specific heat (D) It is a bad conductor of heat energy
50. Which of the following is not due to total internal reflection?
(A) Brilliance of diamond
(B) Working of optical fibre
(C) Difference between apparent and real depth of a pond
(D) Mirage on hot summer days
51. A black body, which is at a high temperature T K, thermal radiation emitted at the rate of
E W/m2. If the temperature falls to T/4 K, the thermal radiation emitted in W/m 2 will be
(A) E (B) E/4 (C) E/64 (D) E/256
52. Entropy of a system decreases
(A) When heat is supplied to a system at constant temperature
(B) When heat is taken out from the system at constant temperature
(C) At equilibrium
(D) In any spontaneous process
53. An ideal heat engine operates on Carnot cycle between 227 o C and 127o C. It absorbs
6 x 104cal at higher temperature. The amount of heat converted into work equals to
(A) 4.8 x 104 cal (B) 3.5 x 104 cal (C) 1.6 x 104 cal (D) 1.2 x 104 cal
54. In thermodynamics, the Zeroth law is related to
(A) Work done (B) Thermal equilibrium (C) Entropy (D) Diffusion
55. What is the phase difference between acceleration and velocity of a particle executing
simple harmonic motion?
(A) Zero (B) (C) π (D) 2π

56. Time period of a simple pendulum in a freely falling lift will be
(A) Finite (B) Infinite (C) Zero (D) All of these
57. The waves which cannot travel without medium are
(A) X-rays (B) Radio waves (C) Light waves (D) Sound waves

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58. A wave is represented by x = 4cos 8𝑡 − , where x and y are in metre and t in second.
-1
The frequency of the wave (in s ) is
(A) (B) (C) (D)

59. Four molecules of a gas have speeds 1, 2, 3 and 4 km/s. The value of the r.m.s. speed of
the gas molecules is

(A) √15 km/s (B) √10 km/s (C) 2.5 km/s (D) km/s

60. Two point charges Q1 and Q2 exert a force F on each other when kept certain distance
apart. If the charge on each particle is halved and the distance between the particles is
doubled, then the new force between the two particles would be
(A) (B) (C) (D)
x-x-x
[ROUGH WORK]

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[ROUGH WORK]

(7)

[ROUGH WORK]

(8)