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

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 # 2

Free electrons are

Question # 3

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 # 4

If an electron of charge 'e' is accelerated through a potential difference V., it will acquire energy

Question # 5

Resistance of a conductor is increased, the currant will

Question # 6

The SI unit of capacitance is

Question # 7

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

Question # 8

The fractional change in resistance per kelvin is known as

Question # 9

The unit of resistivity is

Question # 10

Capacitance of two or more capacitors

Question # 11

The thermistors are usually made of

Question # 12

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

Question # 13

Which of the following represents an electric current?

Question # 14

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

Question # 15

An electron of charge e coulomb passes through a potential difference of V volts its energy in joules will be

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ECAT Physics Chapter 12 Important MCQ's

Sr.# Question Answer
1 If we plot graph between potential difference (V) and current (I) obeying ohm's law, it will give us
A. parabola
B. straight line
C. hyper bola
D. ellipse
2 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
3 The force between two chares 0.06 m apart is 5 N. If each charge is moved towards the other by 0.01 m, then the force between them will become
A. 7.20 N
B. 11.25 N
C. 22.50 N
D. 45.00
4 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
5 The capacity of a parallel plat capacitor depends on the
A. Type to metal used
B. Thickness of plates
C. Potential applied across the plates
D. Separation between the plates
6 The earth's potential is taken as
A. Negative
B. Positive
C. Zero
D. Infinite
7 Resistor is a device which convert electric energy to
A. Heat energy
B. Chemical energy
C. Elastic energy
D. All of the above
8 The thermistors are usually made of
A. Metals with low temperature coefficient of resistivity
B. Metals with high temperature coefficient of resistivity
C. Metal oxides with high temperature coefficient of resistivity
D. Semi conducting materials having low temperature coefficient of resistivity
9 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
10 Surface density of charge is defined as
A. Charge per unit volume
B. Charge per unit length
C. Charge per unit area
D. Charge per unit mass

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