# CBES Board Class 12/CBES Board(Class 12-Physics)MCQ Questions with Answers(Chapter 2 Electrostatic Potential and Capacitance) Sample Test,Sample questions

## Question: `A capacitor has some dielectric between its plates, and the capacitor is connected to a dc source. The battery is now disconnected and then the dielectric is removed, then`

1.capacitance will increase.

2.Â energy stored will decrease.

3.Â energy stored will decrease.

4.voltage will decrease.

Posted Date:-2021-02-02 13:02:27

## Question: `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`

1.Â increases

2.decreases

3.does not change

4.Â becomes zero

Posted Date:-2021-02-02 13:02:27

## Question: `A test charge is moved from lower potential point to a higher potential point. The potential energy of test charge will`

1.remain the same

2.Â increase

3.decrease

4.Â become zero

Posted Date:-2021-02-02 13:02:27

## Question: `Â If a conductor has a potential V â‰  0 and there are no charges anywhere else outside, then`

1.there must be charges on the surface or inÂ¬side itself.

2.there cannot be any charge in the body of the conductor.

3.there must be charges only on the surface.

4.both (a) and (b) are correct.

Posted Date:-2021-02-02 13:02:27

## Question: `Consider a uniform electric field in the z-direction. The potential is a constant`

1.Â for any x for a given z

2.for any y for a given z

3.on the x-y plane for a given z

4.all of these

Posted Date:-2021-02-02 13:02:27

## Question: `Dielectric constant for a metal is`

1.zero

2.Â infinite

3.1

4.10

Posted Date:-2021-02-02 13:02:27

## Question: `Equipotential surfaces`

1.Â are closer in regions of large electric fields compared to regions of lower electric fields.

2.will be more crowded near sharp edges of a conductor.

3.will always be equally spaced.

4.Â both (a) and (b) are correct.

Posted Date:-2021-02-02 13:02:27

## Question: `In a parallel plate capacitor, the capacity increases if`

1.area of the plate is decreased.

2.Â distance between the plates increases.

3.area of the plate is increased.

4.dielectric constantly decreases.

Posted Date:-2021-02-02 13:02:27

## Question: `In a region of constant potential`

1.the electric field is uniform.

2.the electric field is zero.

3.there can be no charge inside the region.

4.both (b) and (c) are correct.

Posted Date:-2021-02-02 13:02:27

## Question: `ï»¿Which of the following statement is true?`

1.Electrostatic force is a conservative force.

2.Potential at a point is the work done per unit charge in bringing a charge from any point to infinity.

3.Electrostatic force is non-conservative

4.Potential is the productof charge and work.

Posted Date:-2021-02-02 13:02:27

## Question: `Two identical capacitors are joined in parallel, charged to a potential V, separated and then connected in series, the positive plate of one is connected to the negative of the other. Which of the following is true?`

1.The charges on the free plated connected to-gether are destroyed.

2.The energy stored in ths system increases.

3.The potential difference between the free plates is 2V.

4. The potential difference remains constant.

Posted Date:-2021-02-02 13:02:27

## Question: `When air is replaced by a dielectric medium of constant K, the maximum force of attraction between two charges separated by a distance`

1.Â increases K times

2.remains unchanged

3.decreases K times

4.increases K-1Â times

Posted Date:-2021-02-02 13:02:27

## Question: `Which of the following statements is false for a perfect conductor?`

1.The surface of the conductor is an equipoten-tial surface.

2.The electric field just outside the surface of a conductor is perpendicular to the surface.

3.The charge carried by a conductor is always uniformly distributed over the surface of the conductor.

4.Â None of these.

Posted Date:-2021-02-02 13:02:27

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