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

Electron volt is the unit of.

Question # 2

Ohm is the unit of

Question # 3

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

Question # 4

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 # 5

Two electric bulbs of 200 W and 100 W have same voltage. If R1and R2be their resistance respectively then

Question # 6

What is the current is a 2 x 106ohm resistor having a potential difference of 2 x 103volts?

Question # 7

Calculate the amount of charge flowing in 2 minutes in a wire of resistance 10Ωwhen a potential difference of 20 V is applied between its ends

Question # 8

The speed of randomly moving electrons depends upon

Question # 9

Ohm's law states that

Question # 10

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

Question # 11

The thermistors are usually made of

Question # 12

Surface density of charge is defined as

Question # 13

The resistance of the given conductor can be increased by

Question # 14

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

Question # 15

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

Question # 16

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 # 17

The resistance of an incandescent lamp is

Question # 18

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

Question # 19

Heating effect caused by an electric circuit is written

Question # 20

Which one of the following has larger value of relative permitivity Erat room temperature?

Question # 21

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

Question # 22

In a Milikian's oil drop experiment the charge on an oil drop is calculated to be 6.35 x 10-19C. The number of excess electrons on the drop is

Question # 23

The minimum charge on any object can not be less than

Question # 24

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

Question # 25

The electric lines of force are

Question # 26

Which one of the following is the unit of electric field intensity

Question # 27

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)

Question # 28

The energy stored in a charge capacitor

Question # 29

Coulomb's force between two point charges depends upon

Question # 30

The unit of intensity of electric field is

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 A certain charge liberates 0.8 g of oxygen. The same charge will liberate. how many g of silver?
A. 108 g
B. 10.8 g
C. 0.8 g
D. 108/0.8 g
2 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
3 One coulomb per second is equal to
A. One volt
B. One ampere
C. One hom
D. One henry
4 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
5 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
6 Two conductors having the same type of charges are connected by a conducting wire. There would not be any amount of charges on them if
A. They have the same potential
B. They have the same amount of charge
C. They have the same capacity
D. They have the same shape
7 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
A. 0.4 A
B. 11.4 A
C. 9.8 A
D. 10.6 A
8 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
A. Increase
B. Decrease
C. Remain F
D. Become 10F/9
9 The ratio of the gravitational force Fgto the electrostatic force Febetween two electrons at the same distance apart is approximately
A. 9.8
B. 24 x 1019
C. 24 x 1042
D. 24 x 10-44
10 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
A. 5 volt
B. 3 volt
C. 15 volt
D. 9 volt

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