Question # 1

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

The heat produced by passage of current.

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H=I²Rt

H=IR2T

H=I/Rt

H=I²/Rt

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

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 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 conventional current is due to the flow of

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Atoms and molecules

Positive charge

Negative charge

Bot (b) and (c)

mho -m-1 is the unit of.

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Resistance

Resistivity

Conductance

Conductivity

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

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

Which one of the following bulbs has the least resistance.

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100 W

200 W

500 W

1000 W

The thermistors convert changes of temperature into.

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Light energy

Electric voltage

Heat

Sound

An ideal current source shall have resistance

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Zero

Finite but not zero

Infinite

Depend upon requirement

If there is no fourth band, tolerance is shows as

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10%

For non-ohmic devices, the graph between V and I is

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Not a straight line

A straight line

A curve

All of above

During electrolysis process, density of CuSO₄ solution

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Remains constant

Decreased

Increased

None of these

In carbon resistors, then value of Blue colour is.

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6

7

8

9

Resistance tolerance for gold colour is.

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50%

30%

20%

5%

If a charge Q flows through any cross section of the conductor in time t, the current I is

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I=Qt

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