Physics 2025 Previous Year Paper

(A) Semiconductor devices require cathode heating for the production of charge carriers.

(B) They have long life and high reliability.

(C) They are small in size and consume low power.

(D) They operate at high voltage.

Choose the correct answer from the options given below:

(A) (A) and (D) only

(B) (B) and (C) only

(C) (A) and (B) only

(D) (B), (C) and (D) only

Choose the correct answer from the options given below:

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

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

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

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

(A) Its melting point is high

(B) Its resistivity is large

(C) It is tensile

(D) It does not oxidize easily by the oxygen of the air when heated

Choose the correct answer from the options given below:

(A) (A), (B) and (D) only

(B) (A), (B) and (C) only

(C) (A), (B), (C) and (D)

(D) (B), (C) and (D) only

Q4. The following statements are given related to Wheatstone Bridge:

(A) when Wheatstone Bridge is balanced, no current flows through the galvanometer arm.

(B) Wheatstone Bridge works on the principle of Kirchhoff's law.

(C) Being a null method based experiment, the result is free from the effect of extra resistances (cell resistance) of the circuit

(D) Wheatstone Bridge is most sensitive when all the four resistances are nearly of the same magnitude.

Choose the correct answer from the options given below:

(A) (A), (B) and (D) only

(B) (A), (B) and (C) only

(C) (A), (B), (C) and (D)

(D) (B), (C) and (D) only

Q5. 

(A) 7.8 A

(B) 15.6 A

(C) 0.78 A

(D) 3.9 A

(A) Hysteresis loss

(B) Flux leakage

(C) Eddy current

(D) Damping

Choose the correct answer from the options given below:

(A) (A), (B) and (D) only

(B) (A), (B) and (C) only

(C) (A), (B), (C) and (D)

(D) (B), (C) and (D) only

Q7. A printed page is kept pressed by a glass cube-shaped paper-weight of edge 3.0 cm. The refractive index of the glass is

μ=1.5. By what amount will the printed letters appear to be shifted when viewed from the top?

(A) 1.0 cm

(B) 0.5 cm

(C) 2.0 cm

(D) 2.5 cm

Q8. 

Q9. 

Q10. The radii of curvature of the two surfaces of a concave lens are 20 cm each. The refractive index of the material of the lens is 1.5. The power of the lens would be-

(A) -5 D

(B) -1 D

(C) 2.5 D

(D) -0.5 D

Q11. Two coherent light sources have intensities in the ratio 25: 16. The ratio of the intensities of maxima to minima, in the interference pattern due to them would be

(A) 25:16

(B) 9:1

(C) 4:1

(D) 81:1

Q12. In the context of the Photoelectric effect, identify the statements which support quantum nature of light.

(A) The electric charge of photoelectrons is quantized

(B) The maximum kinetic energy of photoelectrons depends on the frequency of the incident light, but is independent of its intensity

(C) The photoelectric emission is an instantaneous process without any apparent time lag, even when the incident radiation is made exceedingly dim

(D) There is a minimum frequency of light below which no photoelectrons are emitted

Choose the correct answer from the options given below:

(A) (A), (B) and (D) only

(B) (A), (B), (C) and (D)

(C) (B), (C) and (D) only

(D) (B) and (D) only

Q13. A proton enters a uniform magnetic field of 0.2 T with speed v. It describes a semicircular path of radius 5 cm and comes out of the field. The final speed of the proton will be

(A) 0.5 v

(B) v

(C) 4 v

(D) 0.02 v

Q14.

Q15. A parallel plate air capacitor is charged, and then the battery is disconnected. Now on inserting a dielectric between the plates of the capacitor, which of the following change:

(A) potential difference between the plates

(B) charge on the plates

(C) electric field between the plates

(D) energy stored in the capacitor

Choose the correct answer from the options given below:

(A) (A), (B) and (D) only

(B) (A), (C) and (D) only

(C) (B), (C) and (D) only

(D) (A), (B), (C) and (D)

Q16. In a coil, the current is changed from 12 A to 24 A in 1 s. The self-induced emf of the coil is 24 V. The change in energy in the coil is

(A) 432 J

(B) 360 J

(C) 216 J

(D) 108 J

Q17. The work functions of Cesium and Platinum are 1.9 eV and 5.7 eV, respectively. The ratio of their threshold wavelengths, respectively is

(A) 1:3

(B) 3:1

(C) 1:9

(D) 9:1

Q18. 

Q19.

Q20. In Faraday's experiment on Electromagnetic Induction, in which of the following situations, more deflection will be shown by the galvanometer?

(A) magnet is at rest inside the coil

(B) magnet is accelerated towards the coil

(C) magnet is in uniform motion towards the coil

(D) magnet is decelerated away from the coil

Q21. At an instant of time, a magnetic field is applied along the velocity of the particle. The acceleration produced in the particle will be

(A) along the velocity.

(B) Opposite to the direction of velocity.

(C) Perpendicular to the direction of velocity.

(D) Zero.

Q22. The half life of a radioactive substance is 20 s. The time taken for its sample to decay 7/8th of the initial value

(A) 20 s

(B) 40 s

(C) 60 s

(D) 80 s

Q23.

Q24.

Q25. If the radii of curvature of the faces of a double convex lens are 10 cm and 15 cm, respectively and its refractive index is 1.5, the focal length of the lens in air is

(A) 6 cm

(B) 12 cm

(C) 30 cm

(D) 28 cm

Q26. A long straight conductor carries a current of 304 A. The magnitude of the magnetic field due to the current at a distance of 6 cm from the conductor is

(A) 3.002 mT

(B) 1003 mT

(C) 1.013 mT

(D) 2.012 T

Q27. In n-type semiconductors, Aare the majority charge carriers and B are the minority charge carriers.

Here A and B are

(A) A-electrons; B- protons

(B) A- protons; B- electrons

(C) A- electrons ; B- holes

(D) A-holes; B- electrons

Q28. An eye specialist prescribes spectacles having a combination of a converging lens of focal length 25 cm and a diverging lens of focal length of 20 cm. The power of the combination of two lenses (in dioptre) is

(A) +1.0

(B) -1.0

(C) +1.1

(D) +2.0

Q29. A 600 pF capacitor is charged by a 150 V battery. The charge on the capacitor is:

(A) 9 C

(B) 4 pC

(C) 90 nC

(D) 9 nC

Q30. The current in a resistive series circuit is 7.0 A. On adding a resistance of 1.6 Ω in the same circuit in series, the current drops to 5.0 A. The original resistance of the circuit is

(A) 1.0 Ω

(B) 4.0 Ω

(C) 2.0 Ω

(D) 8.0 Ω

Q31. 

Q32. 

Q33. In Snell's law of refraction, the refractive index of the second medium with respect to the first medium (n ₂₁) is

(A) a characteristic of the medium 1 only

(B) a characteristic of the medium 2 only

(C) independent of the angle of incidence.

(D) not dependent on the wavelength of light

Q34. A cell supplies a current of 0.6 A through a 3 Ω resistor and a current of 0.2 A through a 10 Ω resistor. The internal resistance of the cell is

(A) 0.5 Ω

(B) 1.0 Ω

(C) 0.05 Ω

(D) 0.01 Ω

Q35. Which of the following statements is correct for a compound microscope?

(A) Both the objective and the eye piece should have large aperture.

(B) Both the objective and the eye piece should have large focal lengths.

(C) The eyepiece essentially functions like a simple microscope or a magnifier.

(D) The final image is erect with respect to the original object.

Q36. 

Q37. 

Q38. In a series LCR circuit, C = 80 μF, L = 5.0 H and R = 40 Ω are connected to a variable frequency source of 240 V. The angular frequency of the source which drives the circuit at resonance will be

(A) 5 rad s ⁻¹

(B) 25 rad s ⁻¹

 (C) 0.05 rad s ⁻¹ 

(D) 50 rad s ⁻¹

Q39. 

Q40. Which of the following properties are desired in materials for permanent magnets ?

(A) High retentivity

(B) High coercivity

(C) High permeability

(D) low permeability

Choose the correct answer from the options given below:

(A) (A) and (D) only

(B) (B) and (C) only

(C) (A), (B) and (C) only

(D) (A) and (C) only

Q41. For a short electric dipole, identify the incorrect statement(s).

(A) The electric field intensity varies inversely with the cube of the distance from the center of the dipole.

(B) The electric field is directed from negative to positive charge.

(C) The electric potential at mid-point of the dipole is zero.

(D) The electric field intensity at mid-point of the dipole is zero.

Choose the correct answer from the option given below:

(A) (A) and (C) only

(B) (B) and (D) only

(C) (A) only

(D) (B) only

Q42. Light travels in the form of photons. Identify the correct statements

(A) Photons travel with the velocity of light in vacuum.

(B) The rest mass of photons is taken as zero.

(C) Photons have energy which depends on frequency.

(D) Photons have a momentum inversely dependent on frequency.

Choose the correct answer from the options given below.

(A) (A), (B), (C), and (D)

(B) (A), (C), and (D) only

(C) (A), (B) and (C) only

(D) (B), (C) and (D) only

Q43. 

Q44. With the rise in temperature, the electrical resistance

(A) increases for a conductor and a semiconductor

(B) decreases for a conductor and a semiconductor

(C) increases for a conductor and decreases for a semiconductor

(D) decreases for a conductor and increases for a semiconductor

Q45. 

Q46. In a Young's double-slit experiment, the slits are separated by 0.28 mm and the wavelength of light used is 6000 Å. The fringes are observed on a screen placed 1.4 m away from the slits. The distance between the central bright fringe and the fourth bright fringe will be

(A) 0.3 cm

(B) 0.6 cm

(C) 1.2 cm

(D) 2.4 cm

Q47. A magnetic field energy of 34×10 ⁻⁶J is stored in an inductor of inductance 1.7 mH in a LC circuit. The current flowing in the inductor is

(A) 0.141 A

(B) 0.2 A

(C) 1.41 A

(D) 0.004 A

Q48. 

Q49. 

Q50. In a large building, there are 20 bulbs of 40 W each, 5 bulbs of 100 W each, 5 fans of 80 W each, and 1 heater of 1 kW. The voltage supply is 220 V. The minimum capacity of the main fuse of the building should be

(A) 12.27 A

(B) 10.42 A

(C) 8.31 A

(D) 6 A