Question # 1

Colour codes are used to calculate the.

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Nature of resistor

Numerical value of resistance

Potential difference

Current

In carbon resistors, then value of Blue colour is.

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6

7

8

9

The drift velocity is of order:

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10^-13m/s

10³ m/s

10^-3m/s

10^-4m/s

A wire uniform cross-section. A length L and resistance R is cut into two equal parts. The resistivity of each part will be:

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Doubled

Halved

Remain the same

One fourth

Calculate current in 2 2R /4Ω resistor.

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1 A

2R /4Ω

R/3Ω

2R /3Ω

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

Electric power:

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Vx1

V²x1

V/1

V/1²

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

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

An ideal current source shall have resistance

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Zero

Finite but not zero

Infinite

Depend upon requirement

For ohmic device the graph between V and I is.

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A straight line

Curve

Hyperbola

Parabola

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

If there is no fourth band, tolerance is shows as

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10%

Drift velocity of electrons is.

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10^-1 m/s

10^-2 m/s

10^-3 m/s

10³ m/s

A rheostat can operate as.

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Amplifier

Potential divider

Oscillator

Transformer

Magnetic effect of current is used

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To detect a current

To measure a current

In electric motor

All of above

Which one of the following bulbs has the least resistance.

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100 W

200 W

500 W

1000 W

Resistance tolerance for gold colour is.

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50%

30%

20%

5%

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