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

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 # 2

The capacitance of a parallel plate capacitor depends upon

Question # 3

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 # 4

The electric field due to an infinite long thin wire at a distance R varies as

Question # 5

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

Question # 6

Resistor is a device which convert electric energy to

Question # 7

A piece of fuse wire melts when a current of 15 ampere flows through it. With this current. If it dissipates 22.5 W, the resistance of fuse wire will be

Question # 8

The SI unit of electric field intensity is

Question # 9

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

Question # 10

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

Question # 11

If an electron of charge 'e' is accelerated through a potential difference V., it will acquire energy

Question # 12

Heating effect caused by an electric circuit is written

Question # 13

106electrons are moving through a wire per second, the current developed is

Question # 14

Cause of heat production in a current carrying conductor is

Question # 15

The resistivity of a substance depends upon the

Question # 16

Two point charge +3μC and +8μC repel each other with a force of 40 N. If a charge of -5μC is added to each of them, then the force between then will become

Question # 17

The thermistors are usually made of

Question # 18

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

Question # 19

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

Question # 20

A metal plate of thickness half the separation between the capacitor plates of capacitance C is inserted. The new capacitance is

Question # 21

Electron volt is the unit of

Question # 22

Physicist George Simon ohm was a

Question # 23

The relation between the charge Q of a parallel plate capacitor and the P.D between its plates is

Question # 24

The SI unit of permitivity is

Question # 25

The fractional change in resistance per kelvin is known as

Question # 26

The liquid which conduct current is known as

Question # 27

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

Question # 28

Surface density of charge is defined as

Question # 29

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

Question # 30

Resistance of a conductor is increased, the currant will

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 An electron of charge e coulomb passes through a potential difference of V volts its energy in joules will be
A. V/e
B. eV
C. e/V
D. V
2 A piece of fuse wire melts when a current of 15 ampere flows through it. With this current. If it dissipates 22.5 W, the resistance of fuse wire will be
A. Zero
B. 10Ω
C. 1Ω
D. 0.10Ω
3 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
A. Two
B. 1/2
C. Zero
D. 3/2
4 Resistance of a conductor is increased, the currant will
A. Decrease
B. Increase
C. Remain the same
D. None of these
5 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
6 Resistor is a device which convert electric energy to
A. Heat energy
B. Chemical energy
C. Elastic energy
D. All of the above
7 The conductivity of a superconductor is
A. Infinite
B. Very large
C. Very small
D. Zero
8 A cube of metal is given a positive charge Q. For the above system, which of the following statements is true?
A. Electric potential at the surface of the cube is zero
B. Electric potential within the cube is zero
C. Electric filed is normal to the surface of the cube
D. Electric filed varies within the cube
9 The unit of resistivity is
A. ohm
B. ohm-m2
C. ohm-meter
D. ohm-m-1
10 A uniform resistance wire of Length L and diameter d has a resistance R. Another wire of same material has length, 4L and diameter 2d, the resistance will be
A. 2 R
B. R
C. R/2
D. R/4

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