Question # 1

Resistance tolerance for gold colour is.

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50%

30%

20%

5%

An ideal current source shall have resistance

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Zero

Finite but not zero

Infinite

Depend upon requirement

The heat produced by passage of current.

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H=I²Rt

H=IR2T

H=I/Rt

H=I²/Rt

Heat energy is converted into electrical energy.

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Solar cells

thermocouples

Electric generators

None of above

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 1 x 10⁷ electrons passes through a conductor in 1.0 micro second , then the current is.

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2 A

1.6 A

2.6 x 10^-6 A

1.6 x 10^-6 A

Semiconductor diodes are called:

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Ohmic

non ohmic

Both a & b

none of above

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

A rheostat can operate as.

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Amplifier

Potential divider

Oscillator

Transformer

Magnetic effect of current is used in.

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Toaster

Electric iron

Electric motor

D.C. Battery

Heat sensitive resistors are called.

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resistors

Capacitor

Thermistors

Inductors

A charged conductor has charge on its.

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Inner surface

Outer surface

Middle surface

Surrounding space

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

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140 J

1440 J

14400 J

144000 J

The unit of conductivity is:

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Ohm^-3m^-1

Ohm m^-1

Both a and b

Ohm m^-1

Terminal potential difference is greater than emf of the cell when

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Circuit is open

Circuit is closed

small battery is charged by bigger battery

None of these

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

The resistivity of two wires isρ₁ andρ₂ which are connected in series. If there dimentions are same then the equivalent resistivity of the combination will be:

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(ρ₁ +ρ₂)

1/ρ₁+ 1/ρ₂

ρ₁+ρ₂/2

ρ_1/ρ₂

The drift velocity is of order:

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10^-13m/s

10³ m/s

10^-3m/s

10^-4m/s

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