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

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

Question # 3

A car battery has e.m.f 12 volt and internal resistance 5 x 10-2ohm. If it draws 60 ampere current, the terminal voltage of the battery will be

Question # 4

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 # 5

If the two charges in Coulomb's law have double distance between them, then electric force

Question # 6

The SI unit of conductivity is

Question # 7

If 2.2 kilowatt power is transmitted through a 10 ohm line at 22000 volt, the power loss in the form of heat will be

Question # 8

Calculate the amount of charge flowing in 2 minutes in a wire of resistance 10Ωwhen a potential difference of 20 V is applied between its ends

Question # 9

The SI unit of permitivity is

Question # 10

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 # 11

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 # 12

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

Question # 13

In a building, there are 15 bulbs of 40 watts, 5 bulbs of 100 watts, 5 fans of 80 watts and a heater of 1 kilowatt. The voltage of the electric main is 220 volts. The minimum efficiency of the main fuse of the building will be

Question # 14

An alpha particle is accelerated through a potential difference of 106volt. Its kinetic energy will be

Question # 15

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 # 16

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

Question # 17

The conventional current in a circuit is defined as " current which passes from a point at higher potential to a point at lower potential as if it represent a movement of

Question # 18

One coulomb per second is equal to

Question # 19

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 # 20

Resistance of a conductor is increased, the currant will

Question # 21

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

Question # 22

In case of a parallel plate capacitor if the plate separation is doubled and plate area is halved, the capacitance becomes

Question # 23

Some charge is being given to a conductor. Then its potential

Question # 24

Ohm established a relation between

Question # 25

In a Milikian's oil drop experiment the charge on an oil drop is calculated to be 6.35 x 10-19C. The number of excess electrons on the drop is

Question # 26

The graphical representation of ohm's law is

Question # 27

The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10-15 is

Question # 28

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

Question # 29

Electric potential of earth is taken to be zero because the earth is good

Question # 30

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 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
2 The concept of field theory was put forward by
A. Franklin
B. Kepler
C. Oersted
D. Michael Faraday
3 If we plot graph between potential difference (V) and current (I) obeying ohm's law, it will give us
A. parabola
B. straight line
C. hyper bola
D. ellipse
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 Taking the earth to be a spherical conductor of diameter 12.8 x 103km. Its capacity will be
A. 711μF
B. 611μF
C. 811μF
D. 511μF
6 The unit of resistivity is
A. ohm
B. ohm-m2
C. ohm-meter
D. ohm-m-1
7 Free electrons are
A. tightly bound
B. fixed
C. loosely bound
D. tightly fixed
8 The resistance of a conductor does not depend on its
A. mass
B. resistivity
C. length
D. cross-sectional area
9 Electron volt is the unit of
A. Potential difference
B. Energy
C. Resistance
D. Capacitance
10 A car battery has e.m.f 12 volt and internal resistance 5 x 10-2ohm. If it draws 60 ampere current, the terminal voltage of the battery will be
A. 5 volt
B. 3 volt
C. 15 volt
D. 9 volt

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