Question # 1

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

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Zero

F/2

F

2F

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

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Increase

Decrease

May increase or decrease

Remain the same

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

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Decreases

Increases

Remains uncharged

Becomes zero

The fractional change in resistance per kelvin is known as

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temperature coefficient

resistance coefficient

super temperature

critical temperature

Electron volt is the unit of

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Potential difference

Energy

Resistance

Capacitance

A conducting wire is drawn to double its length. Final resistivity of the material will be

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Double of the original one

Half of the original one

One fourth of the original one

Same as original one

The unit of resistivity is

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ohm

ohm-m²

ohm-meter

ohm-m^-1

Two point charges A and B separated by a distance R attract each other with a force of 12 x 10^-3N. The force between A and B when the charges on them are doubled and distance is halved

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1.92 N

19.2 N

12 N

0.192 N

The value of electrical constant of proportionality k is

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9 x 10⁹Nm²C^-2

9 x 10^-9Nm²C^-2

9 x 10¹⁰Nm²C²

9.85 x 10^-12N^-1C^-2

The electric field will be uniform

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Near a positive point charge

Near a negative point charge

Between two oppositely charged parallel metal plates

None of above

The liquid which conduct current is known as

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heating effect

chemical energy

electrolyte

ohm's law

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

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64 W

80 W

100 W

125 W

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

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Coulomb's law

Gauss's law

Biot-Sarwat law

Ampere's law

A medium of dielectric constant 'K' is introduced between the plates of parallel plate condenser. As a result its capcitance

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Increase k time

Decreases k times

Decreases 1/K times

Remains unchanged

Cause of heat production in a current carrying conductor is

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Collisions of free electrons with one another

High drift speed of free electrons

Collisions of free electrons with atoms or ions of conductor

High resistance value

The thermistors are usually made of

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Metals with low temperature coefficient of resistivity

Metals with high temperature coefficient of resistivity

Metal oxides with high temperature coefficient of resistivity

Semi conducting materials having low temperature coefficient of resistivity

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