Question # 1

The unit of resistance is:

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Ω

Ωm

Ω^-1m^-1

Ωm^-1

One ohm is equal to

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VC-1

CV-1

AC-1

VA^-1

A wire uniform cross-section. A length L and resistance R is cut into two equal parts. The resistivity of each part will be:

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Doubled

Halved

Remain the same

One fourth

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

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Carbon

Iron

Tungsten

Gold

5 A of current flows through a conductor in 2 minutes, charge in the wire is.

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500 C

600 C

400 C

10 C

Semiconductor diodes are called:

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Ohmic

non ohmic

Both a & b

none of above

The color code of "Green"

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8

3

5

7

the current which flows from a point at higher. potential to point at lower potential is called.

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Electric current

Conventional current

Either of these

None of above

The resistivity of --------------------decrease with the increase in temp

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Gold

Silver

Copper

Silicon

The current through a resistance of 100 Ohm when connecting across a source of 220 V is.

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22000 A

22 A

2.2 A

0.45 A

Ampere second stands for the unit of.

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Charge

emf

energy

Power

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 SI unit of resistivity is.

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Ohm m-2

Ohm m-1

Ohm m

Ohm

Resistance tolerance of silver band is.

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10%

6%

7%

5%

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

Drift velocity of electrons is.

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10^-1 m/s

10^-2 m/s

10^-3 m/s

10³ m/s

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

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3 RΩ

2R /4Ω

R/3Ω

2R /3Ω

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

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