12th Physics Question

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 

Answer:- A

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

Answer:- B

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

(A) 90°

(B) 45°

(C) 30° 

(D) do not intersect

Answer:- D

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

Answer:- A

5. Electrostatic field is 

(A) conservative

(B) non-conservative

(C) somewhere conservative and somewhere non-conservative

(D) None of these 

Answer:- A

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 

Answer:- A

7. Debye is the unit of 

(A) charge 

(B) polarization

(C) electric dipole moment

(D) none 

Answer:- C

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 

Answer:- B

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 

Answer:- A

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

Answer:- D

11. The unit of Electric susceptibility (χ) is 

(A) Nm-1

(B) Fm-1

(C) CV-1

(D) None of these 

Answer:- B

12. The unit of electric field intensity is 

(A) NC

(B) NC-1

(C) Vm

(D) CN-1

Answer:- B

13. The dimensional formula of electric field intensity is 

(A) [MLT-2 A-1]

(B) [MLT-3A-1

(C) [ML2T-3A -2]

(D) [ML2T2A2]

Answer:- A

14. Which of the following is a vector? 

(A) charge 

(B) capacity

(C) electric field intensity

(D) None of these 

Answer:- C

15. When a soap bubble is charged, its radius 

(A) increases 

(B) decreases

(C) remains the same

(D) becomes zero

Answer:- A

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

(A) Cm

(B) C / m

(C) C m2

(D) C2 m

Answer:- A

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 

Answer:- D

18. When a body is charged, its mass : 

(A) increases 

(B) decreases

(C) remains same

(D) may increase or decrease 

Answer:- D

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