Question # 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

Magnetic effect of current is used

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To detect a current

To measure a current

In electric motor

All of above

The reciprocal of resistance is called.

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Capacitance

Resistance

Conductance

Inductance

A charged conductor has charge on its.

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Inner surface

Outer surface

Middle surface

Surrounding space

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 condition for the wheatstone bridge to be balanced is given by

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None of above

Tolerance of "Gold" band.

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±10%

±5%

±15%

±20%

Resistivity at a given temperature depends upon.

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Area of cross section

Length

Nature of material of conductor

Both length and area

When a wire of length 'l' and resistance R is cut into two equal parts then resistivity of each part.

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is doubled

Remains the same

Is halved

Is one fourth

Thermosouple is an arrangement of two different metals:

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Two convert heat energy into electrical energy

To produce more heat

To convert heat energy into chemical energy

To convert electrical energy into heat energy

Magnetic effect of current is used in.

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Toaster

Electric iron

Electric motor

D.C. Battery

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

The unit of conductivity is:

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Ohm^-3m^-1

Ohm m^-1

Both a and b

Ohm m^-1

Colour codes are used to calculate the.

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Nature of resistor

Numerical value of resistance

Potential difference

Current

The free electrons experience force.

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In direction of -E

In direction of E

Both A and B

All of the above

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 thermistors convert changes of temperature into.

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Light energy

Electric voltage

Heat

Sound

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

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