ECAT Pre General Science Physics Chapter 12 MCQ Test With Answer

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

The electric flux from a closed surface

Question # 2

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

Question # 3

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

Question # 4

The conductivity of a superconductor is

Question # 5

The electric field due to an infinite long thin wire at a distance R varies as

Question # 6

Specific resistance of a wire depends upon

Question # 7

Physicist George Simon ohm was a

Question # 8

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 # 9

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

Question # 10

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 # 11

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

Question # 12

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 # 13

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 # 14

The thermistors are usually made of

Question # 15

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

Question # 16

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

Question # 17

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

Question # 18

The speed of randomly moving electrons depends upon

Question # 19

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

Question # 20

Two conductors having the same type of charges are connected by a conducting wire. There would not be any amount of charges on them if

Question # 21

Battery is charged in motor cars, which is based on

Question # 22

Capacitance of two or more capacitors

Question # 23

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

Question # 24

If the distance of separation between two chares is increased, the electrical potential energy of the system will

Question # 25

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

Question # 26

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

Question # 27

When an electron is accelerated through a P.D. of an one volt, it will acquire energy equal to

Question # 28

If the two charges in Coulomb's law have double distance between them, then electric force

Question # 29

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

Question # 30

The electrode connected with the positive terminal of the current source is called

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 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
2 The relation between charge 'Q' and current 'I' is given by
A. Q = I/t
B. Q = It
C. Q = I2t
D. Q = I2/t
3 If one volt is needed to cause a current of one ampere to flow in a conductor, its resistance is
A. one ohm
B. one joule
C. one volt
D. one ampere
4 The SI unit of current is
A. watt
B. coulomb
C. volt
D. ampere
5 The earth's potential is taken as
A. Negative
B. Positive
C. Zero
D. Infinite
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 A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, then
A. The charge in the plates reduces and potential difference increase
B. Potential difference between the plates increase, stored energy decreases and charge remains the same
C. Potential difference between the plates decreases and charge remains unchanged
D. None of the above
8 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
9 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
10 The electric lines of force are
A. Imaginary
B. Physically existing everywhere
C. Physically existing near the charge
D. All of the above

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