CBSE Class 12 Physics Exam 2024 Question Paper and Answer Key

CBSE Class 12 Physics Exam 2024 Question Paper and Answer Key

The CBSE Class 12 Physics examination, held on March 4th, 2024, has concluded, and students who appeared for the exam can now access the answer key for all sets. The answer key for CBSE Class 12 Physics Exam 2024 is now available on this platform for students to review and assess their performance.

Sections	Number of questions	Marks Allotted
Section-A	16 (12 MCQs and 4 Assertion Reasoning)	1 x 16 = 16
Section-B	5 Questions	5 x 2 = 10
Section-C	7 Questions	7 x 3 = 21
Section-D	2 Case Study-Based Questions	2 x 4 = 8
Section-E	3 Long Answer Questions	3 x 5 = 15

Class 12 Physics Answer Key 2024:

CBSE Class 12 Physics Answer Key 2024 Set 1 Question

Question Paper Code: 55/4/1

Q1. Two charges + q each are kept ‘2a’ distance apart. A third charge – 2q is placed midway between them. The potential energy of the system is-
Answer: (C) -7q2 /8πε0a

Q2. Two identical small conducting balls and B₂ are given -7 pC and + 4 B₁ pC charges respectively. They are brought in contact with a third identical ball B₃ and then separated. If the final charge on each ball is -2 pC, the initial charge on B₃ was
Answer: B) – 3 pC

Q3. The quantum nature of light explains the observations on the photoelectric effect as-
Answer: (B) the maximum kinetic energy of photoelectrons depends only on the frequency of incident radiation.

Q4. The radius (r_n) of nth orbit in Bohr model of hydrogen atom varies with n
Answer: (C) r_n & n²

Q5. A straight wire is kept horizontally along east-west direction. If a steady current flows in wire from east to west, the magnetic field at a point above the wire will point towards
Answer: (C) North

Q6. The magnetic susceptibility for a diamagnetic material is
Answer: (A) small and negative

Q7. A galvanometer of resistance 100 ohm is converted into an ammeter of range (0-1 A) using a resistance of 0.1 ohm. The ammeter will show full scale deflection for a current of about
Answer: (D) 0.1 A

Q8. A circular loop A of radius R carries a current L. Another circular loop B of radius r (= R/20) placed concentrically in the plane of A. The magnetic flux linked with loop B is proportional to
Answer: (C) R2/3

Q9. Figure shows the variation of inductive reactance X₁ of two ideal inductors of inductance L₁ and L₂ with angular frequency w. The value of
Answer: (C) 3

Q10. The phase difference between electric field E and magnetic field B in an electromagnetic wave propagating along z-axis is
Answer: (A) Zero

Q11. A coil of N turns is placed in a magnetic field such that B is perpendicular to the plane of the coal R changes with time as B=B₀ cos (2πt/T) where ‘T’ is time period. The magnitude of emf induced in the coil will be maximum at
Answer: (C) t = nT/2

Q12. In Balmer series of hydrogen atom, as the wavelength of spectral lines decreases, they appear-

Answer: (B) further apart and stronger in intensity.

Q13. Assertion (A): Electrons are ejected from the surface of zinc when it is irradiated by yellow light.
Reason (R): Energy associated with a photon of yellow light is more than the work function of zinc.

Answer:(C) If Assertion (A) is true and Reason (R) is false.

Q14. Assertion (A): The temperature coefficient of resistance is positive for metals and negative for p-type semiconductors.
Reason (R): The charge carriers in metals are negatively charged, whereas the majority charge carriers in p-type semiconductors are positively charged.

Answer: (A) If both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).

Q15. Assertion (A): When electrons drift in a conductor, it does not mean that all free electrons in the conductor are moving in the same direction.
Reason (R): The drift velocity is superposed over large random velocities of electrons.

Answer: (A) If both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).

Q16. Assertion (A): In interference and diffraction of light, light energy reduces in one region producing a dark fringe. It increases in another region and produces a bright fringe.
Reason (R): This happens because energy is not conserved in the phenomena of interference and diffraction.

Answer: (B) If both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A)

Note:

More Question Paper Set and Solutions Coming Soon

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