ECAT Pre General Science Physics Chapter 12 MCQ Test With Answer

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

Try The 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

The force of repulsion between two point charges is F, when these are at a distance 0.1 m apart. Now the point charges are replaced by sphere of radii 5 cm each having the same charge as that of the respective point charges. The distance between their centre is again kept 0.1 m ; then the force of repulsion will

Question # 2

The SI unit of current is

Question # 3

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

Question # 4

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

Question # 5

The unit of conductance is

Question # 6

The electric field intensity at a point due to a point charge

Question # 7

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

Question # 8

When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates

Question # 9

The electric flux from a closed surface

Question # 10

Current provided by a battery is maximum when

Question # 11

For two resistance wires joined in parallel, the resultant resistance is 6/5 ohm. When one of the resistance wire breaks, the effective resistance becomes 2 ohm. The resistance of the broken wire is

Question # 12

Surface density of charge is defined as

Question # 13

The conductivity of a superconductor is

Question # 14

An electric charge at rest is

Question # 15

The value of electrical constant of proportionality k is

Question # 16

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

Question # 17

Battery is charged in motor cars, which is based on

Question # 18

Potentiometer is more sensitive than voltmeter, because

Question # 19

Free electrons are

Question # 20

When three identical bulbs of 60 watt, 200 volt rating are connected in series to a 200 volt supply, the power drawn by them will be

Question # 21

The thermistors are usually made of

Question # 22

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

Question # 23

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 # 24

Which of the following represents an electric current?

Question # 25

A point charge A of charge +4μC and another B of charge -1μC are placed in air at a distance 1 m apart. Then the distance of the point on the line joining the charge B, where the resultant electric field is zero, is (in m)

Question # 26

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?

Question # 27

The statement "the electric force of repulsion or attraction between two point charges is directly proportional to the product of the charges and inversely proportional to square of the distance between them" refer to

Question # 28

Thermocouple is an arrangement of two different metals

Question # 29

A (100 W , 200 W) bulb is connected to a 160 V power supply. The power consumption would be

Question # 30

Electric flux is defined by the relation

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 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
2 The SI unit of electric field intensity is
A. CN-1
B. NC-1or Vm-1
C. JC-1
D. AV-1
3 In a voltmeter the conduction takes place due to
A. Electrons only
B. Holes only
C. Electrons and holes
D. Electrons and ions
4 The liquid which conduct current is known as
A. heating effect
B. chemical energy
C. electrolyte
D. ohm's law
5 The potential difference across each resistance in series combination is
A. same
B. different
C. zero
D. none of these
6 Specific resistance of a wire depends upon
A. Length
B. Cross-section area
C. Mass
D. None
7 If an electron of charge 'e' is accelerated through a potential difference V., it will acquire energy
A. Ve
B. V/e
C. e/V
D. 2Ve
8 Ohm is the unit of
A. current
B. capacitance
C. energy
D. resistance
9 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
10 The charge carriers in gases are
A. electrons
B. ions
C. protons
D. ions and electrons

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