CBSE Class 12 Physics Pre-Board Sample Paper: This sample paper is designed to provide you with a realistic exam experience and help you strategize your study plan. To achieve this, they conduct several pre-board exams that give the actual board exam environment. These pre-board exams help students get familiar with the exam format, boost their confidence, and motivate them to study effectively. The performance in the pre-board exams is often a good indicator of how well students will do in the final board exams. Here, the pre-board question paper for Class 12 Physics is provided, along with possible solutions for Section A. Students are encouraged to attempt the paper, check their answers, and discuss them with their teacher to ensure proper understanding and preparation.
General Instructions:
(1) There are 33 questions in all. All questions are compulsory.
(2) This question paper has five sections: Section A, Section B, Section C, Section D and Section E.
(3) Section A contains sixteen questions, twelve MCQ and four Assertion Reasoning based of 1 mark each, Section B contains five questions of two marks each, Section C contains seven questions of three marks each, Section D contains two case study based questions of four marks each and Section E contains three long answer questions of five marks each.
(4) There is no overall choice. However, an internal choice has been provided in one question in Section B, one question in Section C, one question in each CBQ in Section D and all three questions in Section E. You have to attempt only one of the choices in such questions
(5) Use of calculators is not allowed.
(6) You may use the following values of physical constants where ever necessarily.
i) c = 3 x 108 m/s
ii) me = 9.1 x10 - 31 kg
iii) e = 1.6 x 10 - 19 C
iv) μ0 = 4π x 10 - 7 TmA- 1
v) h = 6.63 x10 - 34 Js
vi) ε0 = 8.854 x10 - 12 C
2N- 1m- 2
vii) Avogadro’s number = 6.023 X 1023 per gram mole
Section - A
1. A transformer works on the principle of:
a) Coulomb's law b) Ampere's law
c) Faraday's law of electromagnetic induction d) Ohm's law
2. The S.I. unit of electric flux is:
a) Volt b) Coulomb c) Weber d) Volt-meter
3. 1. Which of the following has the smallest wavelength?
a) Gamma rays b) X-rays c) Ultraviolet rays d) Infrared rays
4. The number of electrons in one coulomb of charge is approximately:
a) 1.6 x 1019
b) 6.25 x 1018
c) 3.2 x 1019
d) 1.6 x 1018
5. A diode is used as?
a) Rectifier b) Amplifier c) Inverter d) As an AND Gate
6. In a pn junction diode, in forward bias:
a) Junction resistance decreases
b) Width of depletion layer decreases
c) Both a and b
d) None of the above
7. The work function of a metal is:
a) The minimum energy required to remove an electron from the metal surface
b) The maximum energy required to remove an electron from the metal surface
c) The average energy required to remove an electron from the metal surface
d) None of the above
8. A concave mirror of focal length 15 cm forms an image of an object placed at 10 cm from the mirror. The image formed is:
a) Real and inverted b) Virtual and erect c) Real and erect d) Virtual and inverted
9. A point charge Q is moved along a circular path around another fixed-point charge. So, the work done is
a) always zero
b) zero only if Q returns to it’s starting position
c) zero only if the two charges have the same magnitude
d) zero only if the two charges have the same magnitude and opposite signs
10. Which of the following principle is used in optical fiber?
a) Total internal reflection b) Scattering
c) Interference d) Diffraction
11. The longest wavelength in the ultraviolet region of the hydrogen spectrum is 122 nm. The shortest wavelength in the infrared region of the hydrogen spectrum (to the nearest integer) is
a) 823 nm b) 802 nm c) 1882 nm d) 1648 nm
12. If an a.c. main supply is given to be 220 V, the average e.m.f. during a positive half cycle will be
a) 240 V b) 220√2 V c) 220 V d) 198 V
13. Assertion (A): Corpuscular theory fails in explaining the velocities of light in air and water.
Reason (R): According to Corpuscular theory, the light should travel faster in denser media than in rarer media.
a) Both A and R are true and R is the correct explanation of A.
b) Both A and R are true but R is not the correct explanation of A.
c) A is true but R is false.
d) A is false but R is true.
14. 18. Assertion (A): In an intrinsic semiconductor, the number of electrons in the conduction band is equal to the number of holes in the valence band.
Reason (R): Intrinsic semiconductors are doped with impurity atoms to increase their conductivity.
a) Both A and R are true and R is the correct explanation of A.
b) Both A and R are true but R is not the correct explanation of A.
c) A is true but R is false.
d) A is false but R is true.
15. Assertion (A): When two semiconductor of p and n - type are brought in contact, they form p - n junction which act like a rectifier.
Reason (R): A rectifier is used to convert alternating current into direct current.
a) Both A and R are true and R is the correct explanation of A.
b) Both A and R are true but R is not the correct explanation of A.
c) A is true but R is false.
d) A is false but R is true.
16. Assertion (A): The inductance of a solenoid depends on the number of turns and the length of the solenoid.
Reason (R): Increasing the number of turns or decreasing the length of the solenoid increases the magnetic flux linkage per unit current.
a) Both A and R are true and R is the correct explanation of A.
b) Both A and R are true but R is not the correct explanation of A.
c) A is true but R is false.
d) A is false but R is true.
Section - B
17. Define electric dipole moment. Give its S.I. unit.
18.. State Gauss's law. How is it useful in calculating the electric field due to a uniformly
charged spherical shell?
19. Five balls, numbered 1 to 5 are suspended using separate threads. Pairs (1, 2), (2, 4), (4, 1) show electrostatic attraction, while pairs (2, 3) and (4, 5) show repulsion. What is the nature of the charge on ball 1?
20. Derive the relation between current and drift velocity.
21. For a glass prism (μ = √3 ), the angle of minimum deviation is equal to the angle of the prism. Find the angle of the prism.
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To download the complete question paper and its solutions, click on the link below:
CBSE Class 12 Chemistry Pre-Board Sample Paper 2025
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