ECAT Pre Computer Science Chapter 12 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 12 Electrostatics

Try The MCQ's Test For ECAT Physics Chapter 12 Electrostatics

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ECAT Physics Chapter 12 Electrostatics

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Question # 1

Three resistors of resistance R each are combined in various ways. Which of the following cannot be obtained?

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

The earth's potential is taken as

Question # 7

The charge carriers in gases are

Question # 8

The nature of capacity of electrostatic capacitor depends on

Question # 9

Surface density of charge is defined as

Question # 10

One joule is equal to

Question # 11

The electric lines of force are

Question # 12

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

Question # 13

In bringing an electron towards another electron, electrostatic potential energy of system

Question # 14

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 # 15

The electric field will be uniform

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 One electron volt is equal to
A. 1.6 x 1019eV
B. 6.25 x 1018 eV
C. 1.6 x 1018 eV
D. 6.25 x 1019eV
2 The resistivity of a substance depends upon the
A. length
B. mass
C. area
D. temperature
3 The unit of resistivity is
A. ohm
B. ohm-m2
C. ohm-meter
D. ohm-m-1
4 Equal charges are given to two spheres of different radii. The potential will
A. Be more on the smaller sphere
B. Be more on the bigger sphere
C. Be equal on both the sphere
D. Depend on the nature of the material of the sphere
5 The energy required to charge a capacitor of 5μF by connecting D.C. source of 20 KV is
A. 10 KJ
B. 5 KJ
C. 2 KJ
D. 1 KJ
6 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
A. 2 R
B. R
C. R/2
D. R/4
7 Which one of the following causes production of heat when current is set up in a wire?
A. Fall of electrons from higher orbits to lower orbits
B. Inter-atomic collisions
C. Inter-electron collisions
D. Collisions of conduction electron with atoms
8 The speed of randomly moving electrons depends upon
A. pressure
B. volume
C. temperature
D. mass
9 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
10 A 100 W, 200 V bulb is connected to a 160 volts supply. The actual power consumption would be
A. 64 W
B. 80 W
C. 100 W
D. 125 W

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