Question # 1

The powers of two electric bulbs are 100w and 200w. Which are connected to power supply of 220 V. The ratio of resistance of their filament will be:

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1:2

2:1

1:3

4:3

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

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Increase

Remains constant

Decreases

Changes exponentially

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

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None of above

The value of maximum output power is?

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E/4R

E²/4R

E/4R²

Non of above

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

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 unit of conductivity is:

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Ohm^-3m^-1

Ohm m^-1

Both a and b

Ohm m^-1

A certain wire has a resistance R, the resistivity of an other wire of an identical material with the first, except for twice its diameter is.

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1/4 R

4R

2R

Same as R

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

When a pot difference of 4 volt is applied across resistance, 10 J of energy is converted Find charge flows

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0.20 C

2.5 C

5.0 C

10.0 C

Kirchhoff's first rule is the manifestation of the law of conservation of.

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Mass

Charge

Energy

Momentum

The product of resistance and conductance is

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1

Resistivity

Conductance

Zero

Heat generated by a 40 W bulb in one hour is.

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140 J

1440 J

14400 J

144000 J

Tolerance of "Gold" band.

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±10%

±5%

±15%

±20%

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

An ideal current source shall have resistance

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Zero

Finite but not zero

Infinite

Depend upon requirement

A charged conductor has charge on its.

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Inner surface

Outer surface

Middle surface

Surrounding space

The reciprocal of resistance is called.

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Capacitance

Resistance

Conductance

Inductance

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