ECAT Pre Computer Science Chapter 12 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 12 Electrostatics

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ECAT Physics Chapter 12 Electrostatics

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Question # 1

The liquid which conduct current is known as

Question # 2

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

Question # 3

Taking the earth to be a spherical conductor of diameter 12.8 x 103km. Its capacity will be

Question # 4

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 # 5

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

Question # 6

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 # 7

Potentiometer is more sensitive than voltmeter, because

Question # 8

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

Question # 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

Question # 10

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 # 11

In a voltmeter the conduction takes place due to

Question # 12

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

Question # 13

Electron volt is the unit of

Question # 14

The resistance of a conductor does not depend on its

Question # 15

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

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 Taking the earth to be a spherical conductor of diameter 12.8 x 103km. Its capacity will be
A. 711μF
B. 611μF
C. 811μF
D. 511μF
2 If the distance between the plates of a parallel plate condenser of capacity 10μF is doubled then new capacity will be
A. 5μF
B. 20μF
C. 10μF
D. 15μF
3 The resistance of 20 cm long wire is 10Ω. When the length is changed to 40 cm. The new resistance is
A. 10Ω
B. 20Ω
C. 30Ω
D. 40Ω
4 The relation between the charge Q of a parallel plate capacitor and the P.D between its plates is
A. Q=V/C
B. Q=C/V
C. Q=1/2CV
D. Q=CV
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 A 50 volt battery is connected across 10 ohm resistor. The current is 4.5 A. The internal resistance of the battery is
A. Zero
B. 0.5Ω
C. 1.1Ω
D. 5.0Ω
7 At ordinary temperature, an increase in temperature increases the conductivity of
A. Conductor
B. Semiconductor
C. Insulator
D. Alloy
8 The powers of tow electric bulbs are 100 W and 200 W. Both of them are joined with 220 V mains. The ratio of resistances of their filaments will be
A. 1 : 2
B. 2 : 1
C. 1 : 4
D. 4 : 1
9 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
A. 25
B. 225
C. 625
D. 1250
10 Three resistance 500,500 and 50 ohms are connected in series across 555 volts mains. The current flowing through them will be
A. 0.52 A
B. 1 mA
C. 0.7 mA
D. 1.4 A

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