NCERT Class 12 Chapter 1 Physics Electric Charges and Fields MCQ

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1. In figure two positive charges q₂ and q₃ fixed along the y-axis, exert a net electric force in the + x-direction on a charge q₁ fixed along the x-axis. If a positive charge Q is added at (x, 0), the force on q₁ CBSE Class12 Physics Electric Charges and Fields (1Q)

CBSE Class12 Physics Electric Charges and Fields (1Q)

A. shall increase along the positive x-axis

B. shall decrease along the positive x-axis

C. shall point along the negative x-axis

D. shall increase but the direction changes because of the intersection of Q with q₂ and q₃

2. The surface considered for Gauss’s law is called

A. Closed surface

B. Spherical surface

C. Gaussian surface

D. Plane surface

3. Which of the following statements is not true about Gauss’s law?

A. Gauss’s law is true for any closed surface.

B. The term q on the right side side of Gauss’s law includes the sum of all charges enclosed by the surface

C. Gauss’s law is not much useful in calculating electrostatic field when the system has some symmetry.

D. Gauss’s law is based on the inverse square dependence on distance contained in the coulomb’s law

4. A material in which electrons are tightly bound and cannot move freely at room temperature is called

A. conductors

B. superconductors

C. semiconductors

D. insulators

5. A point positive charge is brought near an isolated conducting sphere (figure). The electric field is best given by

CBSE Class12 Physics Electric Charges and Fields (5Q)

CBSE Class12 Physics Electric Charges and Fields (5Q)

A. (a)

B. (b)

C. (c)

D. (d)

6. The total flux through the faces of the cube with side of length a if a charge q is placed at corner A of the cube is CBSE Class12 Physics Electric Charges and Fields (6Q)

CBSE Class12 Physics Electric Charges and Fields (6Q)

A. (a)

B. (b)

C. (c)

D. (d)

7. A charge Q is placed at the centre of the line joining two point charges +q and +q as shown in the figure. The ratio of charges Q and q is
Physics MCQs for Class 12 with Answers Chapter 1 Electric Charges and Fields 1

A. 4

B. 1/4

C. -4

D. -1/4

8. According to the principle of conservation of charge

A. charges can be created but it cannot be destroyed

B. charges cannot be created but can be destroyed

C. the sum of charges in any system is constant

D. the algebraic sum of charges in any closed system is constant

9. The electric flux through the surface

CBSE Class12 Physics Electric Charges and Fields (9Q)

A. in Fig. (iv) is the largest

B. in Fig. (iii) is the least

C. in Fig. (ii) is same as Fig. (iii) but is smaller than Fig.

D. is the same for all the figures

10. Which of the following statements is not true about Gauss’s law?

A. Gauss’s law is true for any closed surface.

B. The term q on the right side side of Gauss’s law includes the sum of all charges enclosed by the surface.

C. Gauss’s law is not much useful in calculating electrostatic field when the system has some symmetry.

D. Gauss’s law is based on the inverse square dependence on distance contained in the coulomb’s law

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11. The force per unit charge is known as

A. electric flux

B. electric field

C. electric potential

D. electric current

12. A coulomb is same as:

A. ampere/second

B. ampere.second

C. ampere/second²

D. ampere/meter²

13. The figure shows electric field lines in which an electric dipole P is placed as shown. Which of the following statements is correct?

CBSE Class12 Physics Electric Charges and Fields (13Q)

CBSE Class12 Physics Electric Charges and Fields (13Q)

A. The dipole will not experience any force

B. The dipole will experience a force towards right

C. The dipole will experience a force towards left

D. The dipole will experience a force upwards

14. A charge Q is placed at the centre of the line joining two point charges +q and +q as shown in the figure. The ratio of charges Q and q is

CBSE Class12 Physics Electric Charges and Fields (14Q)

A. 4

B. 1/4

C. -4

D. -1/4

15. Electric field lines provide information about

A. field strength

B. direction

C. nature of charge

D. all of these

16. When a glass rod is rubbed with silk, it becomes positively charged because

A. Protons are transferred to silk

B. Electrons are transferred to silk

C. Protons are added to it.

D. Electrons are added to it.

17. A point charge + q is placed at a distance d from an isolated conducting plane. The field at a point P on the other side of the plane is

A. directed perpendicular to the plane and away from the plane

B. directed perpendicular to the plane but towards the plane

C. directed radially away from the point charge

D. directed radially towards the point charge

18. The force per unit charge is known as

A. electric flux

B. electric field

C. electric potential

D. electric current

19. The SI unit of electric flux is

A. N C-1 m-2

B. N C m-2

C. N C-2 m2

D. N C-1 m2

20. The charge on a glass rod that has been rubbed with silk is called positive:

A. so that the proton charge will be positive

B. because like charges repel

C. to conform to the conventions adopted for G and m in Newton’s law of gravitation

D. by arbitrary convention

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21. A hemisphere is uniformely charged positively. The electric field at a point on a diameter away from the centre is directed

A. perpendicular to the diameter

B. parallel to the diameter

C. at an angle tilted towards the diameter

D. at an angle tilted away from the diameter

22. Electric field lines provide information about

A. field strength

B. direction

C. nature of charge

D. all of these

23. The unit of electric dipole moment is

A. newton

B. coulomb

C. farad

D. debye

24. A material in which electrons are loosely bound and can move freely at room temperature is called

A. insulator

B. superconductor

C. semiconductor

D. conductor

25.

CBSE Class12 Physics Electric Charges and Fields (25Q)

A. 3

B. 5

C. 2

D. 7