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

Resistance of a conductor depends upon

Question # 2

The electric intensity at infinite distance from the point charge will be

Question # 3

An electric dipole is at the centre of a hollow sphere of radius r. The total normal electric flux through the sphere is (here Q is the charge and d is the distance between the two charges of the dipole)

Question # 4

A ten ohm electric heater operates on a 110 V line. Calculate the rate at which it develops heat in watts

Question # 5

Thermocouple is an arrangement of two different metals

Question # 6

If a 40 watt light bulb burns for 2 hours. how much heat is generated

Question # 7

Coulomb force, when any material medium is placed between two charges

Question # 8

The earth's potential is taken as

Question # 9

If the length of the conductor is double and its cross sectional area is halved, its conductance will

Question # 10

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

Question # 11

A 10 F capacitor is charged to a potential difference of 50 V and is connected to another uncharged capacitor in parallel. Now the common potential difference becomes 20 volt.The capacitance of second capacitor is

Question # 12

Three resistance 500,500 and 50 ohms are connected in series across 555 volts mains. The current flowing through them will be

Question # 13

The nature of capacity of electrostatic capacitor depends on

Question # 14

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

Question # 15

A 50 volt battery is connected across 10 ohm resistor. The current is 4.5 A. The internal resistance of the battery is

Question # 16

Three resistors of resistance R each are combined in various ways. Which of the following cannot be obtained?

Question # 17

Surface density of charge is defined as

Question # 18

Capacitance of two or more capacitors

Question # 19

The resistivity of a substance depends upon the

Question # 20

The substances whose resistance decreases with the increase in temperature these substances have coefficient of

Question # 21

Three resistors of resistance 2,3 and 6 ohms are connected in parallel, their equivalent resistance is

Question # 22

If we plot graph between potential difference (V) and current (I) obeying ohm's law, it will give us

Question # 23

The conductivity of a superconductor is

Question # 24

Which one of the following causes production of heat when current is set up in a wire?

Question # 25

Ohm's law states that

Question # 26

The fractional change in resistance per kelvin is known as

Question # 27

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

Question # 28

The electric lines of force are

Question # 29

Specific resistance of a wire depends upon

Question # 30

The charge per unit time through any cross-section of a conductor is called

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 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
2 Electron volt is the unit of
A. Potential difference
B. Energy
C. Resistance
D. Capacitance
3 Cause of heat production in a current carrying conductor is
A. Collisions of free electrons with one another
B. High drift speed of free electrons
C. Collisions of free electrons with atoms or ions of conductor
D. High resistance value
4 A one microfarad capacitor of a TV is subjected to 4000 V potential difference. The energy stored in capacitor is
A. 8 J
B. 16 J
C. 4 x 10-3J
D. 2 x 10-3J
5 If the two charges in Coulomb's law have double distance between them, then electric force
A. Becomes two-fold
B. Becomes four-fold
C. Remains the same
D. None of these
6 Heating effect caused by an electric circuit is written
A. H = I2Rt
B. H = I2R
C. H = IR2t
D. H = IR2
7 The substances whose resistance decreases with the increase in temperature these substances have coefficient of
A. positive temperature
B. negative temperature
C. absolute temperature
D. zero temperature
8 Which one of the following has larger value of relative permitivity Erat room temperature?
A. Vaccum
B. Air
C. Glass
D. Water
9 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
A. q = Q/4
B. q = Q/2
C. q = !
D. None of these
10 A heater coil rated at (1000 W - 200 V) is connected to 110 volt line. What will be the power consumed?
A. 200 W
B. 302.5
C. 250 W
D. 350 W

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