Question # 1

Potentiometer is used to.

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Compare emf of two cells

Detect internal resistance of cell

Measure P.D.

All of these

By increasing the temperature of conductor, the flow rate of charges.

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Increase

Remains constant

Decreases

Changes exponentially

A substance having the negative temperature co efficient of resistivity out of the following is.

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Carbon

Iron

Tungsten

Gold

Semiconductor diodes are called:

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Ohmic

non ohmic

Both a & b

none of above

The condition for the wheatstone bridge to be balanced is given by

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None of above

Drift velocity of electrons is.

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10^-1 m/s

10^-2 m/s

10^-3 m/s

10³ m/s

The potential difference between the head and tail of an electrical to

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600 Volt

700 Volt

800 Volt

900 Volt

If there is no fourth band, tolerance is shows as

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10%

The unit of resistance is:

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Ω

Ωm

Ω^-1m^-1

Ωm^-1

Heat energy is converted into electrical energy.

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Solar cells

thermocouples

Electric generators

None of above

When a wire is stretched and its radius becomes r/2, then its resistance will be

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16 R

4 R

2R

0

Specific resistance of a material depends upon.

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Length

Area

Temperature

Both A and B

Thermistor with high - ve temperature coefficient are very accurate for measuring low temperature especially near is.

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10 kelvin

70 kelvin

200 kelvin

35 kelvin

If a charge Q flows through any cross section of the conductor in time t, the current I is

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I=Qt

A battery move a charge of 40 C around a circuit at constant rate in 20 Sec. The current will be.

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2 A

0.5 A

80 A

800 A

The product of resistance and conductance is

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1

Resistivity

Conductance

Zero

The fraction change in resistance per Kelvin is known as:

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Temperature coefficient of Resistance

Coefficient of voltage of change

Thermal expansion

All of the above

The head produced by the passage of current through a resistor is.

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H= I²Rt

H = IR²t

H = 1/Rt

H = I²/Rt

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