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 10–6 C
(C) 5 x 10–6 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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