Class 12th Physics Chapter 1 Electric Charges & Fields VVI Objective Question

Electric Charge And Fields

1. The minimum value of charge on any object cannot be less than

(A) 1.6 x 10-19

(B) 3.2 x 10-19

(C) 4.8 x10-19

(D) 1C

2. The electric field intensity at distances r and 2r from a long, uniformly charged straight wire are E1 or E2 respectively. The ratio of E1 and E2 will be:

(A) 1/2

(B) 2/1

(C) 1/1

(D) None of these

3. At what angle do two electric field lines intersect each other?

(A) 90°

(B) 45°

(C) 30°

(D) do not intersect

4. The quantum of electric charge in e.s.u. is

(A) 4.78 x 10-10

(B) +1.6 x 10-19

(C) 2.99 x 109

(D) –1.6 x 10-19

5. Electrostatic field is

(A) conservative

(B) non-conservative

(C) somewhere conservative and somewhere non-conservative

(D) None of these

6. The specific charge of an electron is

(A) 1.8 x 1011 C/kg

(B) 1.8 x 10-19 C/kg

(C) 1.9 × 10-19 C/kg

(D) none

7. Debye is the unit of

(A) charge

(B) polarization

(C) electric dipole moment

(D) none

8. The intensity of the electric field at any point on the surface of a charged conductor is

(A) zero

(B) perpendicular to the surface

(C) tangential to the surface

(D) at 45° to the surface

9. 1 coulomb charge is equal to

(A) 2.99 x 109 e.s.u.

(B) 9 x 109 e.s.u.

(C) 8.85 x 10-12 e.s.u.

(D) none

10. An electric dipole is placed parallel to X-axis in an electric field. The force on it will be

(A) zero

(B) normal to X-axis

(C) along X-axis

(D) None of these

11. The unit of Electric susceptibility (χ) is

(A) Nm-1

(B) Fm-1

(C) CV-1

(D) None of these

12. The unit of electric field intensity is

(A) NC

(B) NC-1

(C) Vm

(D) CN-1

13. The dimensional formula of electric field intensity is

(A) [MLT-2 A-1]

(B) [MLT-3A-1

(C) [ML2T-3A -2]

(D) [ML2T2A2]

14. Which of the following is a vector?

(A) charge

(B) capacity

(C) electric field intensity

(D) None of these

15. When a soap bubble is charged, its radius

(A) increases

(B) decreases

(C) remains the same

(D) becomes zero

16. The S.I. unit of an electric dipole is

(A) Cm

(B) C / m

(C) C m2

(D) C2 m

17. If sphere of bad conductor is given charge then it is distributed on

(A) surface

(B) surface and also inside the surface

(C) only inside the surface

(D) None of these

18. When a body is charged, its mass :

(A) increases

(B) decreases

(C) remains same

(D) may increase or decrease

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1. Sakshi Sakshi says:

Thanks ❤ for help ❣️