ECAT Pre General Science Physics Chapter 12 MCQ Test With Answer

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

When three identical bulbs of 60 watt, 200 volt rating are connected in series to a 200 volt supply, the power drawn by them will be

Question # 2

The electric intensity outside the two oppositely charged parallel metal plates is

Question # 3

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

Question # 4

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

Question # 5

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 # 6

A 100 W, 200 V bulb is connected to a 160 volts supply. The actual power consumption would be

Question # 7

Cause of heat production in a current carrying conductor is

Question # 8

One electron volt is equal to

Question # 9

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

Question # 10

Ohm is the unit of

Question # 11

Free electrons are

Question # 12

Three resistors of resistance 2,3 and 6 ohms are connected in parallel, their equivalent resistance is

Question # 13

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

Question # 14

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

Question # 15

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 # 16

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

Question # 17

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

Question # 18

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 # 19

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

Question # 20

Ohm established a relation between

Question # 21

A point charge Q is placed at the mid-point of a line joining two charges. 4q and q. if the net force on charge q is zero. then Q must be equal to

Question # 22

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

Question # 23

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

Question # 24

A ten ohm electric heater operates on a 110 V line. Calculate the rate at which it develops heat in watts

Question # 25

The SI unit of electric flux is

Question # 26

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 # 27

The relation V = IR represents

Question # 28

A condenser of capacity 50μF is charged to 10 V.The energy stored is

Question # 29

One moving a charge of 20 coulombs by 2 cm, 2 J of work is done, then the potential difference between the points is

Question # 30

The resistance of an incandescent lamp is

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 A 100 W, 200 V bulb is connected to a 160 volts supply. The actual power consumption would be
A. 64 W
B. 80 W
C. 100 W
D. 125 W
2 The SI unit of permitivity is
A. Nm2C2
B. N-1m-2C2
C. NmC2
D. Nm2C-1
3 The energy stored in a charge capacitor
A. 1/2CV2
B. 1/2C2V
C. 1/2C/V2
D. None of these
4 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
5 The electric lines of force are
A. Imaginary
B. Physically existing everywhere
C. Physically existing near the charge
D. All of the above
6 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?
A. Zero
B. 5μC m-2
C. 20μC m-2
D. 8μC m-2
7 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
8 Electric generators which convert mechanical energy into
A. solar energy
B. thermal energy
C. kinetic energy
D. electrical energy
9 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
10 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

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