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

An electric charge at rest is

Question # 2

The graphical representation of ohm's law is

Question # 3

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

Question # 4

One joule is equal to

Question # 5

Which of the following does not obey ohm's law?

Question # 6

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 # 7

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

Question # 8

A charge Q is divided into two parts q and Q - q and separated by a distance R. The force of repulsion between them will be maximum when

Question # 9

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 # 10

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 # 11

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

Question # 12

If a charged spherical conductor of radius 10 cm has potential V at a point distance 5 cm from its centre, then the potential at a point distance 15 cm from the centre will be

Question # 13

The charge carriers in gases are

Question # 14

The potential difference across each resistance in series combination is

Question # 15

Resistance of a conductor depends upon

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 value of electrical constant of proportionality k is

Question # 18

Electric flux is defined by the relation

Question # 19

Resistor is a device which convert electric energy to

Question # 20

The electric field intensity at a point due to a point charge

Question # 21

The electric field will be uniform

Question # 22

The SI unit of conductivity is

Question # 23

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 # 24

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

Question # 25

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

Question # 26

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

Question # 27

Electron volt is the unit of

Question # 28

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

Question # 29

Current provided by a battery is maximum when

Question # 30

If the distance between the plates of a parallel plate condenser of capacity 10μF is doubled then new capacity will be

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 The electric intensity at infinite distance from the point charge will be
A. Infinite
B. Positive
C. Zero
D. Negative
2 Three resistors of resistance 2,3 and 6 ohms are connected in parallel, their equivalent resistance is
A. 11.0 ohm
B. 1.0 ohm
C. 7.0 ohm
D. 3.0 ohm
3 The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10-15 is
A. 9 x 105V
B. 9 V
C. 8 x 106V
D. 80 V
4 The current through a metallic conductor is due to the motion of
A. protons
B. neutrons
C. electrons
D. free electrons
5 The electrode connected with the positive terminal of the current source is called
A. cathode
B. anode
C. electrolyte
D. position
6 The electric field due to an infinite long thin wire at a distance R varies as
A. 1/R
B. 1/R2
C. R
D. R2
7 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
8 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
9 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
10 The unit of intensity of electric field is
A. newton/coluomb
B. jule/coluomb
C. volt x metre
D. newton/metre

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