electrical

Electrostatics and Capacitance MCQ With Answers Page - 3

1.

Dielectric strength of mica is

Answer/ Hint      

Answer : C

Explanation :

2.

The dielectric constant (relative permittivity) of a glass is given by

Answer/ Hint      

Answer : D

Explanation :

3.

…………capacitors are mainly used for radio frequency tuning

Answer/ Hint      

Answer : B

Explanation :

4.

……….. capacitors can be used only for D.C

Answer/ Hint      

Answer : D

Explanation :

5.

……….. capacitors are used in transistor circuits.

Answer/ Hint      

Answer : A

Explanation :

6.

…………… capacitors are used for audio frequency and radio frequency coupling and tuning.

Answer/ Hint      

Answer : B

Explanation :

7.

The inverse of capacitance called

Answer/ Hint      

Answer : D

Explanation :

8.

When the di-electric is homogeneous, the potential gradient is

Answer/ Hint      

Answer : A

Explanation :

9.

The potential gradient across the material of low permittivity is ……. Than across the material of high permittivity

Answer/ Hint      

Answer : B

Explanation :

10.

………. Fields is associated with the capacitors

Answer/ Hint      

Answer : A

Explanation :

11.

A capacitor having capacitance of 5 µF is charged to potential difference of 10,000 V. the energy stored in the capacitor is

Answer/ Hint      

Answer : D

Explanation :

12.

An equipotential surface is one has all points at ……… potentials

Answer/ Hint      

Answer : A

Explanation :

13.

The total deficiency or excess of electrons in a body is known as

Answer/ Hint      

Answer : D

Explanation :

14.

The relative permittivity has the following units

Answer/ Hint      

Answer : D

Explanation :

15.

If the relative permittivity of mica is 5, its absolute permittivity is

Answer/ Hint      

Answer : A

Explanation :

16.

The direction of the lines of force at any point is the direction along which a unit …… charge placed at that point would move if free to do so

Answer/ Hint      

Answer : A

Explanation :

17.

It was suggested by ……. That the electric field should be imagined to be divided into tubes of force containing a fixed number of lines of force.

Answer/ Hint      

Answer : C

Explanation :

18.

The phenomenon of uncharged body getting charged merely by the nearness of a charged body is known as……

Answer/ Hint      

Answer : D

Explanation :

19.

A unit tube of flux is known as ………… tube

Answer/ Hint      

Answer : B

Explanation :

20.

The number of faraday tubes of flux passing through a surface in an electric field is called

Answer/ Hint      

Answer : A

Explanation :

21.

The unit of electric intensity is

Answer/ Hint      

Answer : C

Explanation :

22.

The value of E within the field due to appoint charge can be found with the help of

Answer/ Hint      

Answer : C

Explanation :

23.

……….. at a point may be defined as equal to the lines of force passing normally through a unit cross-section at that point.

Answer/ Hint      

Answer : A

Explanation :

24.

Electric intensity at any point in an electric field is equal to the ……. At that point.

Answer/ Hint      

Answer : C

Explanation :

25.

Electric displacement is a …….. quantity

Answer/ Hint      

Answer : B

Explanation :

26.

……….. at appoint is equal to the negative potential gradient at that point.

Answer/ Hint      

Answer : A

Explanation :

27.

The unit of dielectric strength is given by

Answer/ Hint      

Answer : A

Explanation :

28.

Dielectric strength ………. With increasing thickness

Answer/ Hint      

Answer : B

Explanation :

29.

The relation between the breakdown voltage V and the thickness (t) of the dielectric is given by V = At2/3  ,where a is a constant depending on the nature of the medium and also on the thickness t. The above statement is known as

Answer/ Hint      

Answer : C

Explanation :

30.

The property of a capacitor to store energy is called its

Answer/ Hint      

Answer : A

Explanation :

31.

…………… is that property of capacitor which delays any charge of voltage across its.

Answer/ Hint      

Answer : B

Explanation :

32.

None of the above

Answer/ Hint      

Answer : D

Explanation :

33.

In a cable capacitor, voltage gradient is maximum at the surface of the

Answer/ Hint      

Answer : B

Explanation :

34.

The time constant of an R-C circuit is defined as the time during which capacitor charging voltage actually rises to …………. Percent of its ………. Value.

Answer/ Hint      

Answer : C

Explanation :

35.

The time constant and R-C circuit may also be defined as the time during which the charging current falls to ………….. percent of its initial maximum value

Answer/ Hint      

Answer : A

Explanation :

36.

The capacitance of the capacitor is influenced by

Answer/ Hint      

Answer : D

Explanation :

37.

When a capacitor undergoes a dielectric breakdown

Answer/ Hint      

Answer : D

Explanation :

38.

If C be the capacitance, V be the potential difference and I be the current, then I/CV will have the unit of

Answer/ Hint      

Answer : A

Explanation :

39.

If a current of 2 A passes through a lamp for 200 seconds, the number of coulombs of charge passing through the lamp in that time will be

Answer/ Hint      

Answer : D

Explanation :

40.

A ceramic and a mica capacitor have the same physical dimensions. Which has a higher value of capacitance?

Answer/ Hint      

Answer : A

Explanation :

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