Question # 1

If one volt is needed to cause a current of one ampere to flow in a conductor, its resistance is

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one ohm

one joule

one volt

one ampere

The resistance of a conductor does not depend on its

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mass

resistivity

length

cross-sectional area

A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor

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Increases

Decreases

Remain unchanged

Becomes infinite

The fractional change in resistance per kelvin is known as

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temperature coefficient

resistance coefficient

super temperature

critical temperature

The earth's potential is taken as

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Negative

Positive

Zero

Infinite

A current of 1.6 A is passed through a solution of CuSO_{4. How many Cu}²⁺ions are liberated in one minute?

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3 x 10²⁰

3 x 10¹⁰

6 x 10²⁰

6 x 10¹⁰

Which one of the following causes production of heat when current is set up in a wire?

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Fall of electrons from higher orbits to lower orbits

Inter-atomic collisions

Inter-electron collisions

Collisions of conduction electron with atoms

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 resistance of the given conductor can be increased by

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Increasing the area

Changing resistivity

Decreasing the length

None of the above because change does not matter because in any case the volume remains the same

In RC series circuit the time during which the capacitor acquires 0.63 times the equilibrium charge is called

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Time constant

Decay constant

None of these

All of above

Two electric bulbs of 200 W and 100 W have same voltage. If R₁and R₂be their resistance respectively then

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R₁= 2R₂

R₂= 2R₁

R₂=4R₁

R₁= 4R₂

A condenser of capacity 50μF is charged to 10 V.The energy stored is

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1.25 x 10^-3J

3.75 x 10^-3J

2.5 x 10^-3J

5 x 10^-3J

Capacitance of two or more capacitors

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Increases in series combination

Increases in parallel combination

Remains unchanged

None of the above

Which of the following represents an electric current?

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C^-1

CS^-1

J.S^-1

dynes^-1

The SI unit of conductivity is

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ohm-m

ohm^-1m^-1

ohm-m^-1

ohm^-1m

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

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64 W

80 W

100 W

125 W

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