ECAT Pre General Science Physics Chapter 12 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 12 Electrostatics

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ECAT Pre General Science Physics Chapter 12 Electrostatics

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Question # 1

Current provided by a battery is maximum when

Question # 2

Potentiometer is more sensitive than voltmeter, because

Question # 3

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

Question # 4

The ohm's is defined as

Question # 5

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

Question # 6

If the distance between the plates of a parallel plate condenser of capacity 10μF is doubled then new capacity will be

Question # 7

The charge carriers in gases are

Question # 8

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 # 9

A closed surface contains two equal and opposite charges. The net electric flux from the surface will be

Question # 10

The unit of resistance is

Question # 11

Electron volt is the unit of

Question # 12

If a charged spherical conductor of radius 10 cm has potential V at a point distance 5 cm from its centre, then the potential at a point distance 15 cm from the centre will be

Question # 13

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

Question # 14

One joule is equal to

Question # 15

One moving a charge of 20 coulombs by 2 cm, 2 J of work is done, then the potential difference between the points is

Question # 16

Taking the earth to be a spherical conductor of diameter 12.8 x 103km. Its capacity will be

Question # 17

Consider a spherical shell of metal at he centre of which a positive point charge is kept

Question # 18

Force acting upon a charged particle kept between the plates of a charged condenser if F. IF one of the plates of the condenser is removed, force acting on the same will become

Question # 19

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

Question # 20

An electron of charge e coulomb passes through a potential difference of V volts its energy in joules will be

Question # 21

The concept of field theory was put forward by

Question # 22

Thermocouple is an arrangement of two different metals

Question # 23

If one volt is needed to cause a current of one ampere to flow in a conductor, its resistance is

Question # 24

The electric field due to an infinite long thin wire at a distance R varies as

Question # 25

Which of the following represents an electric current?

Question # 26

The excess (equal in number) of electrons that must be placed on each of two small spheres spaced 3 cm apart, with force of repulsion between the spheres to be 10-19N, is

Question # 27

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

Question # 28

Coulomb's force between two point charges depends upon

Question # 29

The energy required to charge a capacitor of 5μF by connecting D.C. source of 20 KV is

Question # 30

Free electrons are

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 What is the current is a 2 x 106ohm resistor having a potential difference of 2 x 103volts?
A. 10-1A
B. 10-2A
C. 10-4A
D. 1 mA
2 The powers of tow electric bulbs are 100 W and 200 W. Both of them are joined with 220 V mains. The ratio of resistances of their filaments will be
A. 1 : 2
B. 2 : 1
C. 1 : 4
D. 4 : 1
3 The fractional change in resistance per kelvin is known as
A. temperature coefficient
B. resistance coefficient
C. super temperature
D. critical temperature
4 Potentiometer is more sensitive than voltmeter, because
A. Voltmeter has a very high resistance
B. Voltmeter has a very low resistance
C. Potentiometer does not draw any current from a source of unknown potential difference
D. Potentiometer is sensitive
5 The unit of resistivity is
A. ohm
B. ohm-m2
C. ohm-meter
D. ohm-m-1
6 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
7 Which of the following does not obey ohm's law?
A. Copper
B. Al
C. Diode
D. None
8 The energy required to charge a capacitor of 5μF by connecting D.C. source of 20 KV is
A. 10 KJ
B. 5 KJ
C. 2 KJ
D. 1 KJ
9 A hollow insulated conduction sphere is given a positive charge of 10μC. What will be the electric field at the centre of the sphere if its radius is 2 meters?
A. Zero
B. 5μC m-2
C. 20μC m-2
D. 8μC m-2
10 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)
A. Q/4πr2
B. 2Q/4πr2
C. Q.d
D. Zero

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