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

Electric potential of earth is taken to be zero because the earth is good

Question # 2

The relation V = IR represents

Question # 3

The conductivity of a superconductor is

Question # 4

The concept of field theory was put forward by

Question # 5

The nature of capacity of electrostatic capacitor depends on

Question # 6

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 # 7

The speed of randomly moving electrons depends upon

Question # 8

In case of a parallel plate capacitor if the plate separation is doubled and plate area is halved, the capacitance becomes

Question # 9

Ohm is the unit of

Question # 10

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

Question # 11

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

Question # 12

Coulomb's force between two point charges depends upon

Question # 13

The fractional change in resistance per kelvin is known as

Question # 14

The electric field will be uniform

Question # 15

If a 40 watt light bulb burns for 2 hours. how much heat is generated

Question # 16

A metal plate of thickness half the separation between the capacitor plates of capacitance C is inserted. The new capacitance is

Question # 17

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

Question # 18

At ordinary temperature, an increase in temperature increases the conductivity of

Question # 19

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

Question # 20

Some charge is being given to a conductor. Then its potential

Question # 21

One electron volt is equal to

Question # 22

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

Question # 23

The earth's potential is taken as

Question # 24

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

Question # 25

The liquid which conduct current is known as

Question # 26

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 # 27

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

Question # 28

The SI unit of permitivity is

Question # 29

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

Question # 30

If 2.2 kilowatt power is transmitted through 1 10 ohm line at 22000 volt, the power loss in the form of heat will be

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 Potentiometer is more sensitive than voltmeter, because
A. Voltmeter has a very high resistance
B. Voltmeter has a very low resistance
C. Potentiometer does not draw any current from a source of unknown potential difference
D. Potentiometer is sensitive
2 At ordinary temperature, an increase in temperature increases the conductivity of
A. Conductor
B. Semiconductor
C. Insulator
D. Alloy
3 Two electric bulbs of 200 W and 100 W have same voltage. If R1and R2be their resistance respectively then
A. R1= 2R2
B. R2= 2R1
C. R2 = 4R1
D. R1= 4R2
4 The speed of randomly moving electrons depends upon
A. pressure
B. volume
C. temperature
D. mass
5 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
A. Zero
B. F/2
C. F
D. 2F
6 In Pakistan electricity is supplied for domestic use at 220 V, it is supplied at 110 V in USA. If the resistance of a 60 W bulb for use in Pakistan is R, the resistance of a 60 W bulb for use in USA will be
A. 2 R
B. R/4
C. R/2
D. R
7 The electric field intensity at a point due to a point charge
A. Falls off inversely as the distance
B. Falls off inversely as the square of distance
C. Remains unchanged with distance
D. Increase directly as square of distance
8 For two resistance wires joined in parallel, the resultant resistance is 6/5 ohm. When one of the resistance wire breaks, the effective resistance becomes 2 ohm. The resistance of the broken wire is
A. 3/5 ohm
B. 2 ohm
C. 6/5 ohm
D. 3 ohm
9 The statement "the electric force of repulsion or attraction between two point charges is directly proportional to the product of the charges and inversely proportional to square of the distance between them" refer to
A. Coulomb's law
B. Gauss's law
C. Biot-Sarwat law
D. Ampere's law
10 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

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