MCQs on Capacitance

Contents

- 1 The SI unit of capacitance is:
- 2 The capacitance of a capacitor is
- 3 A capacitor opposes the change in
- 4 A liquid having dielectric constant K is added in the empty space between plates of capacitor. The capacitance of capacitor
- 5 What happens to p.d, if plates of a charged parallel -plate capacitor are pulled apart
- 6 Assuming the earth to be a spherical conductor of radius 6400 km, its capacitance is
- 7 The trimmer is a type of variable capacitor in which capacitance is changed by changing
- 8 The dielectric used in a variable capacitor is generally
- 9 A voltmeter is connected to the plates of a charged capacitor. If the plates of the capacitor are separated further, the reading of the voltmeter will
- 10 It is desired to increase the capacitance of a parallel-plate capacitor. Which of following sheet should be introduced between the plates of capacitor

## The SI unit of capacitance is:

The SI unit of capacitance is:

- Henry
- Farad
- Hertz
- Tesla

Correct answer: 2. Farad

## The capacitance of a capacitor is

The capacitance of a capacitor is:

- Directly proportional to relative permittivity
- Inversely proportional to relative permittivity
- Independent of relative permittivity
- Equal to cube root of relative permittivity

Correct answer: 1. Directly proportional to relative permittivity

## A capacitor opposes the change in

A capacitor opposes the change in:

- Current
- Voltage
- Both of these
- None of the above

Correct answer: 2. Voltage

## A liquid having dielectric constant K is added in the empty space between plates of capacitor. The capacitance of capacitor

A liquid having dielectric constant K is added in the empty space between plates of capacitor. The capacitance of capacitor:

- Decreases by factor K²
- Increases by factor K²
- Decreases by factor K
- Increases by factor K

Correct answer: 4. Increases by factor K

## What happens to p.d, if plates of a charged parallel -plate capacitor are pulled apart

What happens to p.d, if plates of a charged parallel -plate capacitor are pulled apart

- P.d. Will decrease
- P.d. Will increase
- P.d. Will remain unchanged
- None of above

Correct answer: 2. P.d. Will increase

## Assuming the earth to be a spherical conductor of radius 6400 km, its capacitance is

Assuming the earth to be a spherical conductor of radius 6400 km, its capacitance is

- 711 µF
- 644 µF
- 2000 µF
- 200 µF

Correct answer: 1. 711 µF

## The trimmer is a type of variable capacitor in which capacitance is changed by changing

The trimmer is a type of variable capacitor in which capacitance is changed by changing:

- Plate area
- Distance between plates
- Dielectric
- 1 & 3

Correct answer: 2. Distance between plates

## The dielectric used in a variable capacitor is generally

The dielectric used in a variable capacitor is generally:

- Air
- Electrolyte
- Solid
- None of these

Correct answer: 1. Air

## A voltmeter is connected to the plates of a charged capacitor. If the plates of the capacitor are separated further, the reading of the voltmeter will

A voltmeter is connected to the plates of charged capacitor. If plates of capacitor are separated further, the reading of voltmeter will:

- Decrease
- Increase
- Remain constant
- Reduce and eventually become zero

Correct answer: 2. Increase

## It is desired to increase the capacitance of a parallel-plate capacitor. Which of following sheet should be introduced between the plates of capacitor

It is desired to increase the capacitance of a parallel-plate capacitor. Which of following sheet should be introduced between the plates of capacitor?

- Copper
- Stainless steel
- Mica
- Tin

Correct answer: 3. Mica