ECAT Pre Engineering Physics Chapter 12 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 12 Electrostatics

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 12 Electrostatics

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Physics ECAT Pre Engineering Chapter 12 Electrostatics

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Question # 1

A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor

Question # 2

The relation V = IR represents

Question # 3

A metal plate of thickness half the separation between the capacitor plates of capacitance C is inserted. The new capacitance is

Question # 4

Solar cell converts sunlight directly into

Question # 5

A one microfarad capacitor of a TV is subjected to 4000 V potential difference. The energy stored in capacitor is

Question # 6

The potential difference across the conductors should be maintained constant by connecting the ends of wire to the terminal of a device called a source of

Question # 7

The speed of randomly moving electrons depends upon

Question # 8

If we increase the distance between two plates of the capacitor, the capacitance will

Question # 9

The current through a metallic conductor is due to the motion of

Question # 10

The nature of capacity of electrostatic capacitor depends on

Question # 11

If the resistance of 2 ohm and 4 ohm are connected in parallel, the equivalent resistance will be

Question # 12

A charge Q is divided into two parts q and Q - q and separated by a distance R. The force of repulsion between them will be maximum when

Question # 13

A condenser of capacity 50μF is charged to 10 V.The energy stored is

Question # 14

Surface density of charge is defined as

Question # 15

The capacity of a parallel plat capacitor depends on the

Question # 16

A heater coil rated at (1000 W - 200 V) is connected to 110 volt line. What will be the power consumed?

Question # 17

The value of electrical constant of proportionality k is

Question # 18

A certain charge liberates 0.8 g of oxygen. The same charge will liberate. how many g of silver?

Question # 19

A capacitor of capacity 1μF is charged to 1 KV. The energy stored in J

Question # 20

One electron volt is equal to

Question # 21

Resistance of a conductor is increased, the currant will

Question # 22

Coulomb's force between two point charges depends upon

Question # 23

The relation between charge 'Q' and current 'I' is given by

Question # 24

In RC series circuit the time during which the capacitor acquires 0.63 times the equilibrium charge is called

Question # 25

Battery is charged in motor cars, which is based on

Question # 26

The unit of intensity of electric field is

Question # 27

A wire is bent into a ring of radius R is given a charge q. The magnitude of the electrical field at the centre of the ring is

Question # 28

The earth's potential is taken as

Question # 29

When an electron is accelerated through a P.D. of an one volt, it will acquire energy equal to

Question # 30

Which of the following does not obey ohm's law?

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 The energy stored in a charge capacitor
A. 1/2CV2
B. 1/2C2V
C. 1/2C/V2
D. None of these
2 The relation between charge 'Q' and current 'I' is given by
A. Q = I/t
B. Q = It
C. Q = I2t
D. Q = I2/t
3 The ratio of the gravitational force Fgto the electrostatic force Febetween two electrons at the same distance apart is approximately
A. 9.8
B. 24 x 1019
C. 24 x 1042
D. 24 x 10-44
4 Electric flux is defined by the relation
A. E.A.
B. E x A
C. E/A
D. none of these
5 If 2.2 kilowatt power is transmitted through 1 10 ohm line at 22000 volt, the power loss in the form of heat will be
A. 0.1 watt
B. 1 watt
C. 10 watt
D. 100 watt
6 Two electric bulbs of 200 W and 100 W have same voltage. If R1and R2be their resistance respectively then
A. R1= 2R2
B. R2= 2R1
C. R2 = 4R1
D. R1= 4R2
7 The electric flux is linked with a surface will be maximum when
A. The surface is held parallel to the electric field
B. The surface is held perpendicular to the electric field
C. The surface makes an angle of 45° with the electric field
D. All of the above
8 The unit of conductance is
A. ohm
B. meter
C. mho
D. ohm-meter
9 The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10-15 is
A. 9 x 105V
B. 9 V
C. 8 x 106V
D. 80 V
10 Surface density of charge is defined as
A. Charge per unit volume
B. Charge per unit length
C. Charge per unit area
D. Charge per unit mass

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