ECAT Pre General Science Physics Chapter 12 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 12 Electrostatics

Try The 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

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 # 2

Heating effect caused by an electric circuit is written

Question # 3

If we increase the distance between two plates of the capacitor, the capacitance will

Question # 4

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 # 5

Physicist George Simon ohm was a

Question # 6

In a charged capacitor the energy is stored in

Question # 7

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

Question # 8

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

Question # 9

Which one of the following causes production of heat when current is set up in a wire?

Question # 10

The capacity of a parallel plat capacitor depends on the

Question # 11

A closed surface contains two equal and opposite charges. The net electric flux from the surface will be

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

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

Question # 16

The potential difference across the conductors should be maintained constant by connecting the ends of wire to the terminal of a device called a source of

Question # 17

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

Question # 18

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 # 19

A 10 F capacitor is charged to a potential difference of 50 V and is connected to another uncharged capacitor in parallel. Now the common potential difference becomes 20 volt.The capacitance of second capacitor is

Question # 20

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

Question # 21

Ohm's law states that

Question # 22

A cube of metal is given a positive charge Q. For the above system, which of the following statements is true?

Question # 23

The energy required to charge a capacitor of 5μF by connecting D.C. source of 20 KV is

Question # 24

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

Question # 25

Electric generators which convert mechanical energy into

Question # 26

Resistance of a conductor depends upon

Question # 27

If the resistance of 2 ohm and 4 ohm are connected in parallel, the equivalent resistance will be

Question # 28

The speed of randomly moving electrons depends upon

Question # 29

The concept of field theory was put forward by

Question # 30

Magnetic effect at a point caused due to flow a current depend upon the

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 The conductivity of a superconductor is
A. Infinite
B. Very large
C. Very small
D. Zero
2 A parallel plate capacitor is first charged and then a dielectric slab is introduced between the plates. The quantity that remains unchanged is
A. Charge Q
B. Potential V
C. Capacity
D. Energy U
3 Heating effect caused by an electric circuit is written
A. H = I2Rt
B. H = I2R
C. H = IR2t
D. H = IR2
4 The energy stored in a charge capacitor
A. 1/2CV2
B. 1/2C2V
C. 1/2C/V2
D. None of these
5 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
6 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
7 A 10 F capacitor is charged to a potential difference of 50 V and is connected to another uncharged capacitor in parallel. Now the common potential difference becomes 20 volt.The capacitance of second capacitor is
A. 10μF
B. 20μF
C. 30μF
D. 15μF
8 The statement "the electric force of repulsion or attraction between two point charges is directly proportional to the product of the charges and inversely proportional to square of the distance between them" refer to
A. Coulomb's law
B. Gauss's law
C. Biot-Sarwat law
D. Ampere's law
9 Solar cell converts sunlight directly into
A. potential energy
B. thermal energy
C. mechanical energy
D. electrical energy
10 An alpha particle is accelerated through a potential difference of 106volt. Its kinetic energy will be
A. 1 MeV
B. 2 MeV
C. 4 MeV
D. 8 MeV

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