Question # 1

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

Seven resistances are connected as shown in the figures . THe equivalent resistance between A and B is:

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3Ω

4Ω

4.5Ω

5Ω

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

Heat energy is converted into electrical energy.

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Solar cells

thermocouples

Electric generators

None of above

The unit of conductivity is:

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Ohm^-3m^-1

Ohm m^-1

Both a and b

Ohm m^-1

Ampere second stands for the unit of.

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Charge

emf

energy

Power

The unit of resistance is:

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Ω

Ωm

Ω^-1m^-1

Ωm^-1

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 product of resistance and conductance is

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1

Resistivity

Conductance

Zero

What is the resistance of carbon resistor which has band brown black brown.

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100 Ohm

1000 Ohm

10 Ohm

1.0 Ohm

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

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Mass

Charge

Energy

Momentum

The potential difference between the head and tail of an electrical to

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600 Volt

700 Volt

800 Volt

900 Volt

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

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140 J

1440 J

14400 J

144000 J

The color code of "Green"

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8

3

5

7

mho -m-1 is the unit of.

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Resistance

Resistivity

Conductance

Conductivity

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

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Carbon

Iron

Tungsten

Gold

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

Magnetic effect of current is used in.

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Toaster

Electric iron

Electric motor

D.C. Battery

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