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

A capacitor of capacity 1μF is charged to 1 KV. The energy stored in J

Question # 2

Two conductors having the same type of charges are connected by a conducting wire. There would not be any amount of charges on them if

Question # 3

In bringing an electron towards another electron, electrostatic potential energy of system

Question # 4

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

Question # 5

If the distance of separation between two chares is increased, the electrical potential energy of the system will

Question # 6

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

Question # 7

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 # 8

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

Question # 9

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

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

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

Question # 12

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 # 13

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

Question # 14

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

Question # 15

Electric flux is defined by the relation

Question # 16

A medium of dielectric constant 'K' is introduced between the plates of parallel plate condenser. As a result its capcitance

Question # 17

The electric flux from a closed surface

Question # 18

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

Question # 19

One coulomb of charge is created by

Question # 20

A condenser of capacity 50μF is charged to 10 V.The energy stored is

Question # 21

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

Question # 22

If two bulbs one of 60 W and other of 100 W are connected in parallel, then which one of the following will flow more?

Question # 23

The minimum resistance that can be obtained by connecting 5 resistance of 1/4Ωeach is

Question # 24

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 # 25

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 # 26

The minimum charge on any object can not be less than

Question # 27

The SI unit of permitivity is

Question # 28

The electric field will be uniform

Question # 29

Capacitance of two or more capacitors

Question # 30

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 The speed of randomly moving electrons depends upon
A. pressure
B. volume
C. temperature
D. mass
2 One coulomb of charge is created by
A. 10 electrons
B. 1.6 x 10-19electrons
C. 6.25 x 1018electrons
D. 6.25 x 1021electrons
3 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
4 The current through a metallic conductor is due to the motion of
A. protons
B. neutrons
C. electrons
D. free electrons
5 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)
A. 2
B. 1
C. 0.5
D. 1.5
6 In a charged capacitor the energy is stored in
A. Both in positive and negative charges
B. Positive charges
C. The edges of the capacitor plates
D. The electric field between the plates
7 The dot product of electric field intensity E and vector area A is called
A. Electric potential
B. Electric flux
C. Electric field
D. Magnetic field
8 When an electron is accelerated through a P.D. of an one volt, it will acquire energy equal to
A. One joule
B. One erg
C. One electron volt
D. None of these
9 The electric flux from a closed surface
A. Is independent of the shape of the surface
B. Depends on the charge enclosed by the surface
C. Both a and b
D. None of the above
10 A metal plate of thickness half the separation between the capacitor plates of capacitance C is inserted. The new capacitance is
A. C
B. C/2
C. Zero
D. 2C

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