CBSE Class XII Physics Sample Question Paper 2024-25

Organisation : Central Board of Secondary Education (CBSE)
Class Name : 12th/HSC (Class XII)
Subject : Physics
Download : Sample Question Paper 2024-25
Website : https://cbseacademic.nic.in//SQP_CLASSXII_2024-25.html

CBSE Class XII Physics Sample Question Paper

Central Board of Secondary Education (CBSE) Class XII Physics Sample Question Paper 2024-25.

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[Section – A] :
Q1. A uniform electric field pointing in positive X-direction exists in a region. Let A be the origin, B be the point on the X-axis at x = +1 cm and C be the point on the Y-axis at y = +1 cm. Then the potential at points A, B and C satisfy.
(A) VA < VB
(B) VA > VB
(C) VA < VC
(D) VA > VC

Q2. A conducting wire connects two charged conducting spheres of radii r1 and r2 such that they attain equilibrium with respect to each other. The distance of separation between the two spheres is very large as compared to either of their radii. The ratio of the magnitudes of the electric fields at the surfaces of the spheres of radii r1 and r2 is
(A) 𝑟1/𝑟2
(B) 𝑟2/𝑟1
(C) 𝑟22/𝑟12
(D) 𝑟12/𝑟22

Q3. A long straight wire of circular cross section of radius ҅ a᾿ carries a steady current I. The current is uniformly distributed across its cross section. The ratio of magnitudes of the magnetic field at a point a/2 above the surface of wire to that of a point a/2 below its surface is
(A) 4:1
(B) 1:1
(C) 4: 3
(D) 3 :4

Q4. The diffraction effect can be observed in
(A) sound waves only
(B) light waves only
(C) ultrasonic waves only
(D) sound waves as well as light waves

Q5. A capacitor consists of two parallel plates, with an area of cross-section of 0.001 m2, separated by a distance of 0.0001 m. If the voltage across the plates varies at the rate of 108 V/s, then the value of displacement current through the capacitor is
(A) 8.85 × 10−3𝐴
(B) 8.85 × 10−4𝐴
(C) 7.85 × 10−3𝐴
(D) 9.85 × 10−3𝐴

Q6. In a series LCR circuit, the voltage across the resistance, capacitance and inductance is 10 V each. If the capacitance is short circuited the voltage across the inductance will be
(A) 10 V
(B) 10√2 V
(C) 10/√2 V
(D) 20 V

Q8. The distance of closest approach of an alpha particle is d when it moves with a speed V towards a nucleus. Another alpha particle is projected with higher energy such that the new distance of the closest approach is d/2. What is the speed of projection of the alpha particle in this case?
(A) V /2
(B) √2 V
(C) 2 V
(D) 4 V

Q9. A point object is placed at the centre of a glass sphere of radius 6 cm and refractive index 1.5. The distance of virtual image from the surface of the sphere is
(A) 2 cm
(B) 4 cm
(C) 6 cm
(D) 12 cm

Q10. Colours observed on a CD (Compact Disk) is due to
(A) Reflection
(B) Diffraction
(C) Dispersion
(D) Absorption

Q11. The number of electrons made available for conduction by dopant atoms depends strongly upon
(A) doping level
(B) increase in ambient temperature
(C) energy gap
(D) options (A) and (B) both

Q12. If copper wire is stretched to make its radius decrease by 0.1%, then the percentage change in its resistance is approximately
(A) –0.4%
(B) +0.8%
(C) +0.4%
(D) +0.2%

For Questions 13 to 16, two statements are given –one labelled Assertion (A) and other labelled Reason (R). Select the correct answer to these questions from the options as given below.
A. If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
B. If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
C. If Assertion is true but Reason is false.
D. If both Assertion and Reason are false.

Q13. Assertion (A): On increasing the current sensitivity of a galvanometer by increasing the number of turns may not necessarily increase its voltage sensitivity.
Reason(R) : The resistance of the coil of the galvanometer increases on increasing the number of turns.

Q14. Assertion (A): In a hydrogen atom there is only one electron but its emission spectrum shows many lines.
Reason (R): In a given sample of hydrogen there are many atoms each containing one electron; hence many electrons in different atoms may be in different orbits so many transitions from higher to lower orbits are possible.

Q15. Assertion (A): Nuclei having mass number about 60 are least stable..
Reason (R): When two or more light nuclei are combined into a heavier nucleus then the binding energy per nucleon will decrease.

Q16. Assertion (A): de Broglie’s wavelength of a freely falling body keeps decreasing with time.
Reason (R): The momentum of the freely falling body increases with time.

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