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

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

Question # 2

Resistor is a device which convert electric energy to

Question # 3

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

Question # 4

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 # 5

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

Question # 6

The ratio of the gravitational force Fgto the electrostatic force Febetween two electrons at the same distance apart is approximately

Question # 7

Free electrons are

Question # 8

The unit of intensity of electric field is

Question # 9

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

Question # 10

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 # 11

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 # 12

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

Question # 13

In a voltmeter the conduction takes place due to

Question # 14

The electric flux is linked with a surface will be maximum when

Question # 15

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 # 16

Cause of heat production in a current carrying conductor is

Question # 17

Electric generators which convert mechanical energy into

Question # 18

The current through a metallic conductor is due to the motion of

Question # 19

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 # 20

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

Question # 21

Ohm's law states that

Question # 22

The nature of capacity of electrostatic capacitor depends on

Question # 23

At ordinary temperature, an increase in temperature increases the conductivity of

Question # 24

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 # 25

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

Question # 26

The unit of resistivity is

Question # 27

A current of 1.6 A is passed through a solution of CuSO4. How many Cu2+ions are liberated in one minute?

Question # 28

Specific resistance of a wire depends upon

Question # 29

The material in the form of wire or rod or plate which leads the current into or cut of the electrolyte is known as

Question # 30

Battery is charged in motor cars, which is based on

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 A charge of 0.1 c accelerated through a potential difference of 1000V acquires kinetic energy
A. 200 J
B. 100 J
C. 1000 J
D. 400 J
2 The relation between charge 'Q' and current 'I' is given by
A. Q = I/t
B. Q = It
C. Q = I2t
D. Q = I2/t
3 Three resistance 500,500 and 50 ohms are connected in series across 555 volts mains. The current flowing through them will be
A. 0.52 A
B. 1 mA
C. 0.7 mA
D. 1.4 A
4 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
5 Resistor is a device which convert electric energy to
A. Heat energy
B. Chemical energy
C. Elastic energy
D. All of the above
6 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
7 Some charge is being given to a conductor. Then its potential
A. Is maximum at surface
B. Is maximum at centre
C. Is remain same throughout the conductor
D. Is maximum somewhere between surface and centre
8 If the resistance of 2 ohm and 4 ohm are connected in parallel, the equivalent resistance will be
A. 6 ohm
B. 4 ohm
C. zero ohm
D. 1.33 ohm
9 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
10 If the two charges in Coulomb's law have double distance between them, then electric force
A. Becomes two-fold
B. Becomes four-fold
C. Remains the same
D. None of these

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