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

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

Question # 2

The electric field will be uniform

Question # 3

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

Question # 4

The resistance of an incandescent lamp is

Question # 5

The potential difference across each resistance in series combination is

Question # 6

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

Question # 7

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

Question # 8

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 # 9

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

Question # 10

The substances whose resistance decreases with the increase in temperature these substances have coefficient of

Question # 11

A 60 W bulb operates on 220 V supply. The current flowing through the bulb is

Question # 12

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

Question # 13

The resistance of 20 cm long wire is 10Ω. When the length is changed to 40 cm. The new resistance is

Question # 14

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

Question # 15

The conductivity of a superconductor is

Question # 16

Specific resistance of a wire depends upon

Question # 17

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

Question # 18

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

Question # 19

A current of 1.6 A is passed through a solution of CuSO4. How many Cu2+ions are liberated in one minute?

Question # 20

The unit of conductance is

Question # 21

Cause of heat production in a current carrying conductor is

Question # 22

The unit of intensity of electric field is

Question # 23

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

Question # 24

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

Question # 25

Electron volt is the unit of.

Question # 26

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

Question # 27

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 # 28

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

Question # 29

One coulomb of charge is created by

Question # 30

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 Which of the following represents an electric current?
A. C-1
B. CS-1
C. J.S-1
D. dynes-1
2 A medium of dielectric constant 'K' is introduced between the plates of parallel plate condenser. As a result its capcitance
A. Increase k time
B. Decreases k times
C. Decreases 1/K times
D. Remains unchanged
3 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
4 A ten ohm electric heater operates on a 110 V line. Calculate the rate at which it develops heat in watts
A. 1310 W
B. 670 W
C. 810 W
D. 1210 W
5 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
6 When an electron is accelerated through a P.D. of an one volt, it will acquire energy equal to
A. One joule
B. One erg
C. One electron volt
D. None of these
7 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
8 An electric charge at rest is
A. Only an electric field
B. Only a magnetic field
C. Both electric and magnetic fields
D. None of the above
9 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
A. 1/3 V
B. 2/3 V
C. 3/2 V
D. 3V
10 A parallel plate capacitor is first charged and then a dielectric slab is introduced between the plates. The quantity that remains unchanged is
A. Charge Q
B. Potential V
C. Capacity
D. Energy U

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