Question # 1

Heat energy is converted into electrical energy.

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Solar cells

thermocouples

Electric generators

None of above

For ohmic device the graph between V and I is.

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A straight line

Curve

Hyperbola

Parabola

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 drift velocity is of order:

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10^-13m/s

10³ m/s

10^-3m/s

10^-4m/s

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

The Kirchhoff 1^st rule is manifestation of:

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Law of conservation of mass

Law of Conservation of charge

Law of conservation of energy

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 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

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

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

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Carbon

Iron

Tungsten

Gold

A rheostat can be used as variable resistor as well as a-------------

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Potential divider

Current divider

Wheat stone bridge

Power divider

The value of maximum output power is?

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E/4R

E²/4R

E/4R²

Non of above

The product of resistance and conductance is

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1

Resistivity

Conductance

Zero

Heat sensitive resistors are called.

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resistors

Capacitor

Thermistors

Inductors

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

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

During electrolysis process, density of CuSO₄ solution

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Remains constant

Decreased

Increased

None of these

Resistance tolerance for gold colour is.

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50%

30%

20%

5%

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