12th Physics Question

12th Board Exam Physics Chapter 2 Electric Potential And Capacitance Objective Question

Electrostatics Potential And Capacitance

1. If uniform electric field exists along Z-axis, equipotential is along

(A) XY-plane

(B) XZ-plane

(C) YZ-plane

(D) anywhere 

Answer:- A

2. Eight drops each of radius r and charge q are merged to form a big drop. The potential energy of the big drop as compared to one small drop is

(A) 32 times 

(B) 16 times

(C) 8 times 

(D) 4 times 

Answer:- A

3. A spherical conductor is charged. The electric field intensity at its centre will be

(A) infinite 

(B) zero

(C) equal to that at the surface

(D) None of these 

Answer:- B

4. The capacitance of a parallel plate capacitor by the introduction of a dielectric between the plates of the capacitor

(A) increases 

(B) decreases

(C) remains same

(D) nothing can be said

Answer:- A

5. The loss of energy taking place due to sharing of charge between two conductors depends upon

(A) potential difference

(B) square of potential difference

(C) capacitance

(D) l2

Answer:- B

6. A hollow metallic sphere of radius 5 cm is charged to 10 volt. The potential at centre is,

(A) zero 

(B) 10 volt

(C) The same as on 5 cm distance

(D) none 

Answer:- B

7. The amount of energy needed in changing a condenser of capacitance 5 μF to 20 kV is

(A) 1 kJ 

(B) 10 kJ

(C) 100 kJ

(D) 5 kJ 

Answer:- A

8. If the distance between two charged particles be increased, their potential energy

(A) increases 

(B) decreases

(C) remains unchanged

(D) can either increase or decrease 

Answer:- D

9. The capacity of a conductor is inversely proportional to 

(A) area of plates

(B) permittivity of medium between plates

(C) distance between plates

(D) None of these 

Answer:- B

10. The unit of electric potential is volt and is equal to 

(A) joule/coulomb

(B) joule x coulomb

(C) coulomb / joule

(D) None of these

Answer:- A

11. Equal charges are given to two spheres of different radii. The potential will: 

(A) be more on the smaller sphere

(B) be more on bigger sphere

(C) be equal on both the sphere

(D) depend on the nature of the materials of the spheres 

Answer:- A

12. The work done by electric field on a charge taken from one point to another of an equipotential surface will be

(A) positive 

(B) negative

(C) zero 

(D) any of these

Answer:- C

13. If a 10 μF capacitor be charged to 5V, the charge on the capacitor is,

(A) 50 C 

(B) 50 x 106 C

(C) 5 x 106 C

(D) 2 C 

Answer:- C

14. Each of four capacitors has a capacitance of 2 μF. To get an equivalent capacitance of 8 μF, these must be combined

(A) in series 

(B) in parallel

(C) some in series and some in parallel

(D) None of these 

Answer:- B

15. If an earthed conductor is brought near an insulated conductor, then the capacity of insulated conductor

(A) decreases 

(B) increases

(C) remain unchanged

(D) none 

Answer:- B

16. If a conductor is placed in an electric field, the electric field inside the conductor

(A) decreases

 (B) increases 

(C) becomes zero

(D) remains unchanged

Answer:- C

17. van de Graaff generator is a machine that produces 

(A) AC power

(B) current of high frequency

(C) voltage of several lakh volts

(D) only small currents 

Answer:- C

18. Two capacitors, each of capacitance C, are connected in series. Their equivalent capacitance is

(A) 2C 

(B) C

(C) C / 2

(D) 1 / 2C

Answer:- C

19. If there are several capacitors available, for getting maximum capacitance, these should be connected in

(A) series 

(B) parallel

(C) mixed grouping

(D) None of these

Answer:- B

20. When a thin mica sheet is placed between the plates of a parallel plate capacitor, the capacitance

(A) increases slightly

(B) decreases

(C) remains the same

(D) None of these

Answer:- A

21. Two capacitors each of capacitance 1 μF are connected in parallel and a third capacitor of 0.5 μF is connected in series with this combination. The resulting capacitance will be 

(A) 16 μF

(B) 10 F

(C) 2.5 μF

(D) 12 μF

Answer:- C

22. The value of dielectric constant of a substance except air is always greater than 

(A) zero

(B) 0.5

(C) 1

(D) 2

Answer:- C

23. Eight drops each of radius r and charge q are merged to form a single drop. The ratio of the potential of big drop to small drop is

(A) 8:1

(B) 4:1

(C) 2:1

(D) 1:8

Answer:- B

24. If a metal rod is inserted between the plates of a capacitor connecting them, the capacitance will become

(A) zero

(B) infinity

(C) 9 x 109 μF

(D) None of these 

Answer:- B

 25. The electric potential due to a small electric dipole at a large distance r from the center of the dipole is proportional to

(A) r

(B) 1 / r

(C) 1 / r2

(D) 1 / r3

Answer:- C

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