Class 12 Physics MCQs Electrostatic Potential And Capacitance for JEE/NEET

Here, you will get Class 12 Physics MCQ of Chapter 2 Electrostatic Potential And Capacitance for cracking JEE and NEET/AIIMS. By solving these MCQs of Class 12 Physics Chapter 2 Electrostatic Potential And Capacitance, you will get the confidence to crack JEE or NEET. Practice MCQ Questions for Class 12 Physics with Answers on a daily basis and score well in exams. 

Electrostatic Potential And Capacitance Class 12 MCQs Questions with Answers

Two copper spheres of the same radius, one solid and the other hollow, are charged to the same potential. Which will have more charge?
(a) Solid sphere
(b) Hollow sphere
(c) Both will have an equal charge
(d) None of these

Answer: (c) Both will have an equal charge

Two capacitors of capacitance 6 µF and 4 µF are put in series across a 120 V battery. What is the potential difference across the 4 µF capacitor ?
(a) 72 V
(b) 60 V
(c) 48 V
(d) zero

Answer: (a) 72 V

Two conducting spheres of radii r1 and r2 are equally charged. The ratio of their potential is
(a) (r1/r2
(b) (r1r2
(d) (r2/r1)

Answer: (b) (r1r2)²

The dimensions of fall of potential per unit distance are given by
(a) [MLT-3 A-1]
(b) [ML2T-2A-1]
(c) [ML2T-2A-3]
(d) [MLT-2A-2]

Answer: (c) [ML2T-2A-3]

The capacitance of a capacitor will decrease if we introduce a slab of
(a) copper
(b) aluminium
(c) zinc
(d) None of these

Answer: (d) None of these

Twenty seven drops of mercury are charged simultaneously to the same potential of 10 volts. What will be potential if all the charged drops are made to combine to form one large drop?
(a) 180 V
(b) 90 V
(c) 120 V
(d) 45 V

Answer: (b) 90 V

An electron initially at rest is accelerated through a potential difference of one volt. The energy gained by electron is
(a) 1 J
(b) 1.6 × 10-19 J
(c) 10-19 J
(d) None of these

Answer: (b) 1.6 × 10-19 J

A bird sitting on a high power line
(a) gets killed instantly
(b) gets a mild shock
(c) gets a fatal shock
(d) is not affected practically

Answer: (d) is not affected practically

A capacitor is connected to a cell of emf E having some internal resistance r, the potential across the
(a) cell is < E
(b) cell is E
(b) cell is > E
(d) capacitor is E

Answer: (b) cell is E

Equipotential surfaces
(a) are closer in regions of large electric fields compared to regions of lower electric fields
(b) will be more crowded near sharp edges of a conductor
(c) will always be equally spaced
(d) both (a) and (b) are correct

Answer: (d) both (a) and (b) are correct

A test charge is moved from lower potential point to a higher potential point. The potential energy of test charge will
(a) remain the same
(b) increase
(c) decrease
(d) become zero

Answer: (c) decrease

Which of the following statements is false for a perfect conductor?
(a) The surface of the conductor is an equipotential surface
(b) The electric field just outside the surface of a conductor is perpendicular to the surface
(c) The charge carried by a conductor is always uniformly distributed over the surface of the conductor
(d) None of these

Answer: (d) None of these

Two capacitors of 3 µF and 6 µF are connected in series with a battery of P.d. 12 V. The P.d. across 3µF and 6µF capacitors respectively will be
(a) 8 V, 4 V
(b) 6 V, 6 V
(c) 4 V, 8 V
(d) 9 V, 3 V

Answer: (a) 8 V, 4 V

Minimum number of capacitor of 2µF each required to obtain a capacitance of 5µF will be
(a) 4
(b) 3
(c) 5
(d) 6

Answer: (a) 4

The amount of work required to increase the distance between -6µC and 4µC from 6 cm to 18 cm will be :
(a) 1.8 J
(b) 2.4 J
(c) 1.8 µJ
(d) 2.4 µJ

Answer: (b) 2.4 J

Choose the vector physical quantity
(a) Electric flux
(b) Electric potential
(c) Electric potential energy
(d) Electric intensity

Answer: (d) Electric intensity

A polythene piece rubbed with wool is found to have a negative charge of 6.4 × 10-9c. How many electrons have been transferred during the process?
(a) 4 × 1012
(b) 4 × 1011
(c) 4 × 1010
(d) None of these

Answer: (c) 4 × 1010

What is the number of electrons in 100 g water?
(a) 3.35 × 1024
(b) 3.35 × 1025
(c) 6.02 × 1023
(d) None of these

Answer: (a) 3.35 × 1024

The electric potential of earth is taken as
(a) zero
(b) infinity
(c) unity
(d) None of these

Answer: (a) zero

 A parallel plate air capacitor is charged to a potential difference of V volts. After disconnecting the charging battery the distance between the plates of the capacitor is increased using an insulating handle. As a result the potential difference between the plates
(a) increases
(b) decreases
(c) does not change
(d) becomes zero

Answer: (a) increases

When air is replaced by a dielectric medium of constant K, the maximum force of attraction between two charges separated by a distance
(a) increases K times
(b) remains unchanged
(c) decreases K times
(d) increases K-1 times

Answer: (c) decreases K times

The surface density of charge is measure
(a) Cm-1
(b) Cm-2
(c) Cm-3
(d) JC-1

Answer: (b) Cm-2

The capacitance of earth, viewed as a spherical conductor of radius 6408 km is
(a) 1420 µF
(b) 712 µF
(c) 680 µF
(d) 540 µF

Answer: (b) 712 µF

An electric charge of 425 f µC is removed from a fully charged capacitor of capacitance 8.5µF. Its potential will be lowered by
(a) 75 V
(b) 100 V
(c) 85 V
(d) 50 V

Answer: (b) 100 V

Which of the following statement is true?
(a) Electrostatic force is a conservative force
(b) Potential at a point is the work done per unit charge in bringing a charge from any point to infinity
(c) Electrostatic force is non-conservative
(d) Potential is the productof charge and work

Answer: (a) Electrostatic force is a conservative force

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