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Navodaya Vidyalaya Samiti
Regional Office Shillong
Unit-wise Practice Question Paper Set-1
(Unit-1st)
Class- XII (Science)
Subject- Physics (Theory)
Time- 3 Hours Session- (2024-25) Maximum Mark- 70
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) All the sections are compulsory.
(4) 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.
(5) 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.
(6) Use of calculators is not allowed.
(7) You may use the following values of physical constants where ever necessary
i. c = 3 x 108 m/s
ii. Mass of electron = 9.1 x10-31 kg
iii. Mass of Proton = 1.7 x10-27 kg
iv. e = 1.6 x 10-19 C
v. μ0 = 4π x 10-7 T m 𝑨−𝟏
vi. h = 6.63 x10-34 J s
vii. ε0 = 8.854 x10-12 𝑪𝟐𝑵−𝟏𝒎−𝟐
viii. Avogadro’s number = 6.023 X 𝟏𝟎𝟐𝟑 per gram mole.
SECTION- A
1. If 1019 electrons are removed from a neutral metal plate, the electric charge on it is:
A) –1.6 C
B) +1.6 C
C) 1.6 X 10 19 C
D) 10-19 C
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2. Which of the following is false for electric lines of force?
A) They pass through dielectrics but cannot pass through the conductors
B) They are always perpendicular to the surface of a charged conductor
C) They always form closed loops
D) They are parallel and equi-spaced in a region of uniform electric field.
3. An electric dipole placed in a non-uniform electric field experience:
A) both a torque and a net force
B) only a force but no torque
C) only a torque but no net force
D) no torque and no net force.
4. A charge is enclosed in a cube. What is the electric flux associated with one of the faces of the
cube?
A) q/ Ɛ0
B) Ɛ0/q
C)6 q/Ɛ0
D) q/6Ɛ0
5. Electric potential of earth is taken to be zero, because earth is a good:
A) insulator
B) conductor
C) semi-conductor
D) dielectric
6. A charge q is enclosed by a Gaussian spherical surface of radius R. If the radius is doubled, then
the outward flux will:
A) increase four times B) be reduced to half
C) remain the same D) be doubled
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7. Some charge is being given to a conductor. Then its potential:
A) is maximum at surface
B) is maximum at the centre
C) remains the same throughout the conductor
D) is maximum somewhere between the surface and the centre.
8. In bringing an electron towards another electron, electrostatic potential energy of the system:
A) increases
B) decreases
C) remains unchanged
D) becomes zero.
9. A parallel plate capacitor with oil between the plates (Dielectric constant of oil, K= 2) has a
capacitance C. If the oil is removed, then the capacitance of the capacitor becomes:
A) √2C
B)2C
C)C/√C
D)C/2
10. The unit of permittivity of free space is:
A) CN-1m-1
B) Nm2C-2
C) C2N-1m-2
D) C2N-2m-2
11. When a body is charged, its mass-
(a) increase
(b) decrease
(c) remains same
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(d) may increase or decrease
12. The cause of quantization of electric charges is:
(a) Transfer of an integral number of neutrons.
(b) Transfer of an integral number of protons.
(c) Transfer of an integral number of electrons.
(d) None of the above.
In the following questions (13 to 16), a statement of assertion (A) is followed by a statement of
reason (R). Make the correct choices as:
(a) If both assertion and reason are true and reason is correct explanation of the assertion.
(b) If both assertion and reason are true but reason is not the correct explanation of the
assertion.
(c) If assertion is true but reason is false.
(d) If both assertion and reason are false
13. Assertion: Work done in moving a charge on an equipotential surface is zero.
Reason: All the points on a n equipotential surface are at the same potential.
(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 ofAssertion.
(c) Assertion is correct but Reason is incorrect.
(d) Assertion is incorrect but Reason is correct.
14. Assertion (A) : Capacity of a parallel plate capacitor increases when distance between the
plates is decreased.
Reason (R) : Capacitance of capacitor is inversely proportional to distance between them.
(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 ofAssertion.
(c) Assertion is correct but Reason is incorrect.
(d) Assertion is incorrect but Reason is correct.
15. Assertion (A) : If the distance between parallel pates of a capacitor is halved and dielectric
constant is made three times, then the capacitance becomes six times.
Navodaya Vidyalaya Samiti
Regional Office Shillong
Unit-wise Practice Question Paper Set-1
(Unit-1st)
Class- XII (Science)
Subject- Physics (Theory)
Time- 3 Hours Session- (2024-25) Maximum Mark- 70
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) All the sections are compulsory.
(4) 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.
(5) 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.
(6) Use of calculators is not allowed.
(7) You may use the following values of physical constants where ever necessary
i. c = 3 x 108 m/s
ii. Mass of electron = 9.1 x10-31 kg
iii. Mass of Proton = 1.7 x10-27 kg
iv. e = 1.6 x 10-19 C
v. μ0 = 4π x 10-7 T m 𝑨−𝟏
vi. h = 6.63 x10-34 J s
vii. ε0 = 8.854 x10-12 𝑪𝟐𝑵−𝟏𝒎−𝟐
viii. Avogadro’s number = 6.023 X 𝟏𝟎𝟐𝟑 per gram mole.
SECTION- A
1. If 1019 electrons are removed from a neutral metal plate, the electric charge on it is:
A) –1.6 C
B) +1.6 C
C) 1.6 X 10 19 C
D) 10-19 C
, Page 8 of 165
2. Which of the following is false for electric lines of force?
A) They pass through dielectrics but cannot pass through the conductors
B) They are always perpendicular to the surface of a charged conductor
C) They always form closed loops
D) They are parallel and equi-spaced in a region of uniform electric field.
3. An electric dipole placed in a non-uniform electric field experience:
A) both a torque and a net force
B) only a force but no torque
C) only a torque but no net force
D) no torque and no net force.
4. A charge is enclosed in a cube. What is the electric flux associated with one of the faces of the
cube?
A) q/ Ɛ0
B) Ɛ0/q
C)6 q/Ɛ0
D) q/6Ɛ0
5. Electric potential of earth is taken to be zero, because earth is a good:
A) insulator
B) conductor
C) semi-conductor
D) dielectric
6. A charge q is enclosed by a Gaussian spherical surface of radius R. If the radius is doubled, then
the outward flux will:
A) increase four times B) be reduced to half
C) remain the same D) be doubled
, Page 9 of 165
7. Some charge is being given to a conductor. Then its potential:
A) is maximum at surface
B) is maximum at the centre
C) remains the same throughout the conductor
D) is maximum somewhere between the surface and the centre.
8. In bringing an electron towards another electron, electrostatic potential energy of the system:
A) increases
B) decreases
C) remains unchanged
D) becomes zero.
9. A parallel plate capacitor with oil between the plates (Dielectric constant of oil, K= 2) has a
capacitance C. If the oil is removed, then the capacitance of the capacitor becomes:
A) √2C
B)2C
C)C/√C
D)C/2
10. The unit of permittivity of free space is:
A) CN-1m-1
B) Nm2C-2
C) C2N-1m-2
D) C2N-2m-2
11. When a body is charged, its mass-
(a) increase
(b) decrease
(c) remains same
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(d) may increase or decrease
12. The cause of quantization of electric charges is:
(a) Transfer of an integral number of neutrons.
(b) Transfer of an integral number of protons.
(c) Transfer of an integral number of electrons.
(d) None of the above.
In the following questions (13 to 16), a statement of assertion (A) is followed by a statement of
reason (R). Make the correct choices as:
(a) If both assertion and reason are true and reason is correct explanation of the assertion.
(b) If both assertion and reason are true but reason is not the correct explanation of the
assertion.
(c) If assertion is true but reason is false.
(d) If both assertion and reason are false
13. Assertion: Work done in moving a charge on an equipotential surface is zero.
Reason: All the points on a n equipotential surface are at the same potential.
(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 ofAssertion.
(c) Assertion is correct but Reason is incorrect.
(d) Assertion is incorrect but Reason is correct.
14. Assertion (A) : Capacity of a parallel plate capacitor increases when distance between the
plates is decreased.
Reason (R) : Capacitance of capacitor is inversely proportional to distance between them.
(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 ofAssertion.
(c) Assertion is correct but Reason is incorrect.
(d) Assertion is incorrect but Reason is correct.
15. Assertion (A) : If the distance between parallel pates of a capacitor is halved and dielectric
constant is made three times, then the capacitance becomes six times.
