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

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

Question # 2

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

Question # 3

The speed of randomly moving electrons depends upon

Question # 4

If the length of the conductor is double and its cross sectional area is halved, its conductance will

Question # 5

The SI unit of electric field intensity is

Question # 6

The resistance of a conductor does not depend on its

Question # 7

The liquid which conduct current is known as

Question # 8

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

Question # 9

The unit of conductance is

Question # 10

Battery is charged in motor cars, which is based on

Question # 11

At any point on the right bisector of the line joining two equal and opposite charges

Question # 12

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

Question # 13

The concept of field theory was put forward by

Question # 14

A certain charge liberates 0.8 g of oxygen. The same charge will liberate. how many g of silver?

Question # 15

The SI unit of conductivity is

Question # 16

The nature of capacity of electrostatic capacitor depends on

Question # 17

A conducting wire is drawn to double its length. Final resistivity of the material will be

Question # 18

Ohm's law states that

Question # 19

The electric flux from a closed surface

Question # 20

Thermocouple is an arrangement of two different metals

Question # 21

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

Question # 22

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 # 23

The thermistors are usually made of

Question # 24

One coulomb of charge is created by

Question # 25

A parallel plate capacitor is first charged and then a dielectric slab is introduced between the plates. The quantity that remains unchanged is

Question # 26

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 # 27

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

Question # 28

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 # 29

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

Question # 30

A charge Q is divided into two parts q and Q - q and separated by a distance R. The force of repulsion between them will be maximum when

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 If the length of the conductor is double and its cross sectional area is halved, its conductance will
A. Increase four fold
B. Become one-fourth
C. Become one-half
D. Remains unchanged
2 Magnetic effect at a point caused due to flow a current depend upon the
A. Quantity of current
B. Distance from current
C. Both the quantity of current and distance from current element
D. None of the all
3 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
A. 25
B. 225
C. 625
D. 1250
4 If the distance of separation between two chares is increased, the electrical potential energy of the system will
A. Increase
B. Decrease
C. May increase or decrease
D. Remain the same
5 The resistance of 20 cm long wire is 10Ω. When the length is changed to 40 cm. The new resistance is
A. 10Ω
B. 20Ω
C. 30Ω
D. 40Ω
6 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
A. 0.4 A
B. 11.4 A
C. 9.8 A
D. 10.6 A
7 A condenser of capacity 50μF is charged to 10 V.The energy stored is
A. 1.25 x 10-3J
B. 3.75 x 10-3J
C. 2.5 x 10-3J
D. 5 x 10-3J
8 Heating effect caused by an electric circuit is written
A. H = I2Rt
B. H = I2R
C. H = IR2t
D. H = IR2
9 A medium of dielectric constant 'K' is introduced between the plates of parallel plate condenser. As a result its capcitance
A. Increase k time
B. Decreases k times
C. Decreases 1/K times
D. Remains unchanged
10 The relation V = IR represents
A. Ampere law
B. Faraday's law
C. Ohm's law
D. Len's law

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