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 concept of field theory was put forward by

Question # 2

Potentiometer is more sensitive than voltmeter, because

Question # 3

The SI unit of conductivity is

Question # 4

A 60 W bulb operates on 220 V supply. The current flowing through the bulb is

Question # 5

Electron volt is the unit of

Question # 6

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

Question # 7

Battery is charged in motor cars, which is based on

Question # 8

The ohm's is defined as

Question # 9

A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor

Question # 10

In a charged capacitor the energy is stored in

Question # 11

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 # 12

The nature of capacity of electrostatic capacitor depends on

Question # 13

A wire of radius r has resistance R. If it is stretched to a wire of r/2 radius, then the resistance becomes

Question # 14

One coulomb per second is equal to

Question # 15

One electron volt is equal to

Question # 16

The SI unit of capacitance is

Question # 17

If electric and gravitational force on an electron in a uniform electric field will be

Question # 18

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

Question # 19

The minimum charge on any object can not be less than

Question # 20

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

Question # 21

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

Question # 22

Specific resistance of a wire depends upon

Question # 23

Free electrons are

Question # 24

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 # 25

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

Question # 26

The resistance of 20 cm long wire is 10Ω. When the length is changed to 40 cm. The new resistance is

Question # 27

The resistance of the given conductor can be increased by

Question # 28

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 # 29

Equal charges are given to two spheres of different radii. The potential will

Question # 30

The colour sequence in a carbon resistor in red, brown, orange and silver. The resistance of the resistor is

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 The value of electrical constant of proportionality k is
A. 9 x 109Nm2C-2
B. 9 x 10-9Nm2C-2
C. 9 x 1010Nm2C2
D. 9.85 x 10-12N-1C-2
2 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
3 The thermistors are usually made of
A. Metals with low temperature coefficient of resistivity
B. Metals with high temperature coefficient of resistivity
C. Metal oxides with high temperature coefficient of resistivity
D. Semi conducting materials having low temperature coefficient of resistivity
4 The resistance of the given conductor can be increased by
A. Increasing the area
B. Changing resistivity
C. Decreasing the length
D. None of the above because change does not matter because in any case the volume remains the same
5 One joule is equal to
A. 1.6 x 1019eV
B. 6.25 x 1018eV
C. 1.6 x 1818eV
D. 6.25 x 1019eV
6 In a voltmeter the conduction takes place due to
A. Electrons only
B. Holes only
C. Electrons and holes
D. Electrons and ions
7 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
8 An electric charge at rest is
A. Only an electric field
B. Only a magnetic field
C. Both electric and magnetic fields
D. None of the above
9 In bringing an electron towards another electron, electrostatic potential energy of system
A. Decreases
B. Increases
C. Remains uncharged
D. Becomes zero
10 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
A. 1 : 2
B. 2 : 1
C. 1 : 4
D. 4 : 1

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