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Sample Paper 16 CBSE Physics Class 12

CBSE Sample Paper 16

Class XII Exam 2022-23
Physics
Time: 3 Hours Max. Marks: 70
General Instructions:
1. There are 35 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. All the sections are compulsory.
3. Section A contains eighteen MCQ of 1 mark each, Section B contains seven questions of two
marks each, Section C contains five questions of three marks each, section D contains three
long questions of five marks each and Section E contains two case study based questions of 4
marks each.
4. There is no overall choice. However, an internal choice has been provided in section B, C, D
and E. You have to attempt only one of the choices in such questions.
5. Use of calculators is not allowed.

SECTION-A
1. An electric dipole consists of a positive and negative charge of 4 µC each placed at a distance
View Solution of 5 mm. The dipole moment is
(a) 2 # 10-8 C-m (b) 4 # 10-8 C-m (c) 6 # 10-8 C-m (d) 8 # 10-8 C-m

2. When two charged capacitors having capacitance and potential C1 , V1 and C2 , V2 respectively,
View Solution are joined with the help of a wire, the common potential will be
2 2
(a) C1 + C2 (b) C1 V1 + C2 V2 (c) C1 V1 + C2 V2 (d) C1 V 12 + C22V 2
C1 + C 2 V1 + V2 V1 + V 2

3. What is the resistance of a 40 W lamp which is lighted as full brilliance by a current of 1 A?

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View Solution
(a) 120 Ω (b) 240 Ω (c) 360 Ω (d) 480 Ω

4. Two solenoids of the same length having number of turns in the ratio of 2 : 3 are connected in
View Solution series. The ratio of magnetic fields at their centres is
(a) 2 : 1 (b) 3 : 1 (c) 2 : 3 (d) 3 : 2

5. Most of the substance show which of the following magnetic property?

View Solution (a) diamagnetism (b) paramagnetism (c) ferromagnetism (d) both b and c

6. Which of the following does not obey the phenomenon of mutual induction?
View Solution (a) dynamo (b) transformer (c) induction coil (d) electric heater

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7. In a series combination, R = 300 Ω , L = 0.9 H , C = 2 µF , ω = 1000 rad − s−1 . The impedance

View Solution of the LCR-circuit is
(a) 400 Ω (b) 500 Ω (c) 900 Ω (d) 1300 Ω

8. Which of the following waves have maximum wavelength?

View Solution (a) X-rays (b) IR-rays (c) UV-rays (d) radio-waves

9. If a glass rod is immersed in a liquid of the same refractive index, then it will
View Solution (a) disappear (b) look bent (c) look longer (d) look shorter

10. In Huygen’s wave theory, the locus of all points oscillating in the same phase is called a
View Solution (a) ray (b) vibrator (c) wavefront (d) half period zone

11. The number of Photons of frequency 1014 Hz in radiation of 6.62 J will be

View Solution
(a) 1010 (b) 1015 (c) 1020 (d) 1025

12. In photoelectric effect the maximum kinetic energy of emitted electron depends on
View Solution (a) wavelength (b) frequency
(c) intensity (d) work function

13. The quantities, which remain conserved in a nuclear reaction

View Solution (a) Total charge (b) Angular momentum
(c) Linear momentum (d) All the above

14. Three charges, each equal to + q , are placed at the corners of an equilateral triangle. If the force
View Solution between any two charges is F , then net force on either charge will be
(a) 2F (b) 3F (c) 2 F (d) 3 F

15. The net charge on a current carrying conductor is

View Solution (a) zero (b) constant
(c) varying (d) negative

16. Assertion : We cannot think of a magnetic field configuration with three poles.
View Solution Reason : A bar magnet does exert a torque on itself due to its own field.
(a) Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
(b) Both Assertion and Reason are correct, but Reason is not the correct explanation of
Assertion.
(c) Assertion is correct but Reason is incorrect.
(d) Assertion is incorrect but Reason is correct.

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17. Assertion : The setting sum appears to be red.

View Solution Reason : Scattering of light is directly proportional to the wavelength.
(a) Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
(b) Both Assertion and Reason are correct, but Reason is not the correct explanation of
Assertion.
(c) Assertion is correct but Reason is incorrect.
(d) Assertion is incorrect but Reason is correct.

18. Assertion : In Young’s experiment, the fringe width for dark fringes is different from that for
View Solution white fringes.
Reason : In Young’s double slit experiment the fringes are performed with a source of white
light, then only black and bright fringes are observed.
(a) Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
(b) Both Assertion and Reason are correct, but Reason is not the correct explanation of
Assertion.
(c) Assertion is correct but Reason is incorrect.
(d) Assertion is incorrect but Reason is correct.

SECTION-B
19. In which situation is there a displacement current but no conduction current ?
View Solution

20. Define conductivity of a material. Give its SI unit.

View Solution

21. How does a circular loop carrying current behaves as a magnet?

View Solution


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A short bar magnet, placed with its axis making an angle θ with a uniform magnetic field Bv ,
experiences a torque τv. What is the magnetic moment of the magnet?

22. The current flowing through a pure inductance 2 mH is I = (15 cos 300t) A . What is the (i)
View Solution r.m.s. and (ii) average value of current for a complete cycle?
23. State the criteria for the phenomenon of total internal reflection of light to take place.
View Solution


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What is the difference between Magnification and Magnifying power?

24. In the Rutherford scattering experiment, the distance of closest approach for an α -particle is
View Solution d 0 . If α -particle is replaced by a proton, then how much kinetic energy in comparison to α
-particle will be required to have the same distance of closest approach d 0 ?

25. Give two advantages of LED’s over the conventional incandescent lamps.
View Solution

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SECTION-C
26. Two equal balls having equal positive charge q coulombs are suspended by two insulating
View Solution strings of equal length. What would be the effect on the force when a plastic sheet is inserted
between the two?

27. State the Bio-Savart law for the magnetic field due to a current carrying element. Use this law
View Solution to obtain a formula for magnetic field at the centre of a circular loop of radius R carrying a
steady current I . Indicate the direction of the magnetic field.

28. Explain with reason, why

View Solution 1. Sun appears reddish at sun-set or sun-rise
2. Sun is observed earlier to actual sun-rise.


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A convex lens of focal length f1 is kept in contact with a concave lens of focal length f2 Find the
focal length of the combination.

29. Explain why do we need coherent sources to produce interference of light.

View Solution


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How does one demonstrate, using a suitable diagram, that unpolarised light when passed
through a polaroid gets polarised?

30. How the size of a nucleus is experimentally determined? Write the relation between the radius
View Solution and mass number of the nucleus. Show that the density of nucleus is independent of its mass
number.

SECTION-D
31. Define mutual inductance between a pair of coils. Derive an expression for the mutual inductance
View Solution of two long coaxial solenoids of same length round one over the other.


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In a closed circuit of resistance 10 Ω , the linked flux varies with time according to relation
φ = 6t2 − 5t + 1. At t = 0.25 second, What is the current (in Ampere) flowing through the
circuit?

32. Discuss the inconsistency in Ampere’s circuital law. What modification was made my Maxwell
View Solution in this law?


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A parallel plate capacitor is charged to 60 µC . Due to a radioactive source, the plate loses
charge at the rate of 1.8 # 10-8 C-s-1 . What is the magnitude of displacement current?

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33. Considering the case of a parallel plate capacitor being charged, show how one is required to
View Solution generalise Ampere’s circuital law to include the term due to displacement current.


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The V - I characteristic of a silicon diode is as shown in the figure. Calculate the resistance of
the diode at
1. I = 15 mA
2. V =− 10 V .

SECTION-E
34. In 1942, a German physicist Kirchhoff extended Ohms law to complicated circuits and gave
View Solution two laws, which enable us to determine current in any part of such a circuit. According to
Kirchhoff’s first rule, the algebraic sum of the currents meeting at a junction in a closed electric
circuit is zero. The current flowing in a conductor towards the junction is taken as positive
and the current flowing away from the junction is taken as negative. According to Kirchhoff’s
second rule, in a closed loop, the algebraic sum of the emf’s and algebraic sum of the products
of current and resistance in the various arms of the loop is zero. While traversing a loop, if
negative pole of the cell is encountered first, then its emf is negative, otherwise positive.

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(i) Define Kirchhoff’s 1 st law.

(ii) Find the value of current I in the given circuit.

(iii) Define Kirchhoff’s II nd law.

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(iv) Find at the potential difference between A and B in the circuit shown.

35. In Young’s double slit experiment, the width of the central bright fringe is equal to the distance
View Solution between the first dark fringes on the two sides of the central bright fringe.
In given figure below a screen is placed normal to the line joining the two point coherent source
S1 , and S2 . The interference pattern consists of concentric circles.

(i) Find the optical path difference at P .

(ii) Find the radius of the nth bright fringe.
(iii) If d = 0.5 mm , λ = 5000 cA , and D = 100 cm find the value of n for the closest second
bright fringe.


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(iv) By which wave transverse or electromagnetic, the phenomenon of interference is shown?


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