ECAT Pre Engineering Physics Chapter 12 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 12 Electrostatics

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

Question # 2

The earth's potential is taken as

Question # 3

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 # 4

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

Question # 5

A certain charge liberates 0.8 g of oxygen. The same charge will liberate. how many g of silver?

Question # 6

The electric lines of force are

Question # 7

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 # 8

The minimum charge on any object can not be less than

Question # 9

Three resistance 500,500 and 50 ohms are connected in series across 555 volts mains. The current flowing through them will be

Question # 10

The excess (equal in number) of electrons that must be placed on each of two small spheres spaced 3 cm apart, with force of repulsion between the spheres to be 10-19N, is

Question # 11

Coulomb force, when any material medium is placed between two charges

Question # 12

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

Question # 13

The unit of conductance is

Question # 14

A 50 volt battery is connected across 10 ohm resistor. The current is 4.5 A. The internal resistance of the battery is

Question # 15

If we plot graph between potential difference (V) and current (I) obeying ohm's law, it will give us

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

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

Question # 18

Ohm's law states that

Question # 19

One coulomb of charge is created by

Question # 20

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

Question # 21

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

Question # 22

Resistor is a device which convert electric energy to

Question # 23

An electric charge at rest is

Question # 24

The colour sequence in a carbon resistor in red, brown, orange and silver. The resistance of the resistor is

Question # 25

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 # 26

Ohm established a relation between

Question # 27

The electric flux from a closed surface

Question # 28

Current provided by a battery is maximum when

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 The substances whose resistance decreases with the increase in temperature these substances have coefficient of
A. positive temperature
B. negative temperature
C. absolute temperature
D. zero temperature
2 A heater coil rated at (1000 W - 200 V) is connected to 110 volt line. What will be the power consumed?
A. 200 W
B. 302.5
C. 250 W
D. 350 W
3 Free electrons are
A. tightly bound
B. fixed
C. loosely bound
D. tightly fixed
4 The unit of intensity of electric field is
A. newton/coluomb
B. jule/coluomb
C. volt x metre
D. newton/metre
5 A current of 1.6 A is passed through a solution of CuSO4. How many Cu2+ions are liberated in one minute?
A. 3 x 1020
B. 3 x 1010
C. 6 x 1020
D. 6 x 1010
6 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
7 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
8 If an electron of charge 'e' is accelerated through a potential difference V., it will acquire energy
A. Ve
B. V/e
C. e/V
D. 2Ve
9 Thermocouple is an arrangement of two different metals
A. To convert heat energy in to electrical energy
B. To produce more heat
C. To convert heat energy into chemical energy
D. To convert electric energy in to heat energy
10 Which of the following does not obey ohm's law?
A. Copper
B. Al
C. Diode
D. None

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