ECAT Pre Engineering Physics Chapter 12 MCQ Test With Answer

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

The fractional change in resistance per kelvin is known as

Question # 2

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

Question # 3

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 # 4

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

Question # 5

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

Question # 6

The electric flux is linked with a surface will be maximum when

Question # 7

The speed of randomly moving electrons depends upon

Question # 8

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 # 9

Potentiometer is more sensitive than voltmeter, because

Question # 10

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

Question # 11

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

Question # 12

If two bulbs one of 60 W and other of 100 W are connected in parallel, then which one of the following will flow more?

Question # 13

Heating effect caused by an electric circuit is written

Question # 14

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

Question # 15

The electric field will be uniform

Question # 16

A heater coil rated at (1000 W - 200 V) is connected to 110 volt line. What will be the power consumed?

Question # 17

If the length of the conductor is double and its cross sectional area is halved, its conductance will

Question # 18

The force between two chares 0.06 m apart is 5 N. If each charge is moved towards the other by 0.01 m, then the force between them will become

Question # 19

A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor

Question # 20

Cause of heat production in a current carrying conductor is

Question # 21

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

Question # 22

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 # 23

Force acting upon a charged particle kept between the plates of a charged condenser if F. IF one of the plates of the condenser is removed, force acting on the same will become

Question # 24

The resistance of a conductor does not depend on its

Question # 25

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

Question # 26

The charge carriers in electrolyte are positive and negative

Question # 27

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 # 28

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

Question # 29

The graphical representation of ohm's law is

Question # 30

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 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
2 The colour sequence in a carbon resistor in red, brown, orange and silver. The resistance of the resistor is
A. 21 x 103+ 10%
B. 23 x 101+ 10%
C. 21 x 103+ 5%
D. 12 x 103+ 5%
3 If electric and gravitational force on an electron in a uniform electric field will be
A. E=mg/q
B. E=q/mg
C. E=,g/q
D. E=qg/m
4 Resistance of a conductor is increased, the currant will
A. Decrease
B. Increase
C. Remain the same
D. None of these
5 What is the current is a 2 x 106ohm resistor having a potential difference of 2 x 103volts?
A. 10-1A
B. 10-2A
C. 10-4A
D. 1 mA
6 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
A. -q
B. +q
C. -2q
D. +4q
7 The electrode connected with the positive terminal of the current source is called
A. cathode
B. anode
C. electrolyte
D. position
8 If a 40 watt light bulb burns for 2 hours. how much heat is generated
A. 288 x 103J
B. 288 x 108J
C. 288 x 105J
D. 288 x 106J
9 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
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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