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

Two point charges A and B separated by a distance R attract each other with a force of 12 x 10-3N. The force between A and B when the charges on them are doubled and distance is halved

Question # 2

A wire of radius r has resistance R. If it is stretched to a wire of r/2 radius, then the resistance becomes

Question # 3

One coulomb per second is equal to

Question # 4

Electron volt is the unit of

Question # 5

Cause of heat production in a current carrying conductor is

Question # 6

The electrode connected with the positive terminal of the current source is called

Question # 7

Current provided by a battery is maximum when

Question # 8

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

Question # 9

The resistance of 20 cm long wire is 10Ω. When the length is changed to 40 cm. The new resistance is

Question # 10

The concept of field theory was put forward by

Question # 11

Electric flux is defined by the relation

Question # 12

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

Question # 13

Coulomb's force between two point charges depends upon

Question # 14

Electron volt is the unit of.

Question # 15

Two point charge +3μC and +8μC repel each other with a force of 40 N. If a charge of -5μC is added to each of them, then the force between then will become

Question # 16

The charge carriers in gases are

Question # 17

A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, then

Question # 18

An electric charge at rest is

Question # 19

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

Question # 20

Resistance of a conductor is increased, the currant will

Question # 21

Thermocouple is an arrangement of two different metals

Question # 22

The SI unit of conductivity is

Question # 23

The SI unit of current is

Question # 24

The colour sequence in a carbon resistor in red, brown, orange and silver. The resistance of the resistor is

Question # 25

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

Question # 26

106electrons are moving through a wire per second, the current developed is

Question # 27

The relation between the charge Q of a parallel plate capacitor and the P.D between its plates is

Question # 28

If an electron of charge 'e' is accelerated through a potential difference V., it will acquire energy

Question # 29

The electric field will be uniform

Question # 30

What is the current is a 2 x 106ohm resistor having a potential difference of 2 x 103volts?

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 Equal charges are given to two spheres of different radii. The potential will
A. Be more on the smaller sphere
B. Be more on the bigger sphere
C. Be equal on both the sphere
D. Depend on the nature of the material of the sphere
2 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
A. power
B. current
C. resistance
D. temperature
3 A cube of metal is given a positive charge Q. For the above system, which of the following statements is true?
A. Electric potential at the surface of the cube is zero
B. Electric potential within the cube is zero
C. Electric filed is normal to the surface of the cube
D. Electric filed varies within the cube
4 If we increase the distance between two plates of the capacitor, the capacitance will
A. Increase
B. Decrease
C. Remain same
D. First increase then decrease
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 Electric potential of earth is taken to be zero because the earth is good
A. Semiconductor
B. Conductor
C. Insulator
D. Dielectric
7 The electric field due to an infinite long thin wire at a distance R varies as
A. 1/R
B. 1/R2
C. R
D. R2
8 The potential difference across each resistance in series combination is
A. same
B. different
C. zero
D. none of these
9 A proton is about 1840 times heavier than an electron. When it is accelerated by a potential difference of 1 KV, its kinetic energy will be
A. 1840 KeV
B. 1/1840 KeV
C. 1 KeV
D. 920 KeV
10 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

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