Question # 1

The force exerted by two charged bodies on another obeys Coulomb's law provided that

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Both bodies are in the same medium

the charges are not too great

On body does not lie inside the other

The linear dimensions of the body are very much less than the distance between the bodies.

The time constant of a RL circuit is.

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L/R

LR

R/L

L2/R

When current in an inductor is increasing

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energy is lost

Energy is being stored in the magnetic field of the inductor

Energy is being drained from the magnetic field of the inductor

Eddy current is produced

A torch bulb uses a 3 V supply and makes a current of 0.2 A It is switched on for one minute How much electrical energy is used.

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0.6 J

12 J

24 J

36 J

The unit of magnetic induction is.

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weber -metre

weber -metre 2

weber-meter-2

weber-metre-1

Why should household appliances be connected in parallel with the voltage source.

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To increase the resistance of the circuit

To decreases the resistance of the circuit

To provide each appliance the same voltage as the power source

To provide each appliance the same current as the power source.

The free electron theory explains conduction in

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Insulators only

Metals only

Semi conductor only

Non metals only

If a capacitor is charged by using a 1.5 V battery, how much charge will capacitor gain.

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0 V

0.5 V

1.5 V

3 V

When a conductor situated in a dielectric is charted the energy resides.

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Only on the dielectric

Only on medium surrounding charge

On the dielectric and medium both

Only on the type of the charge

Why should the metal casing of an electrical fire be earthen.

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To complete an electrical circuit.

To prevent the fire from overheating

To reduce the risk of electric shocks

To stope the casing from getting too not to touch

Potential of earth's surface is.

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Negative

Positive

Zero

Infinite

The potential difference between two points is equal to the difference of

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Kinetic energy

potential energy

Electric current

Charge energy

The process of converting A.C and D.C. is known as

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Amplification

_Filtration

Rectification

Saturation

Which is the fundamental quantity in electrostatic.

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Electric charge

Electric potential

Electric field

Electric field intensity

A bulb of 100 W is connected to a 160 V supply What will be the power consumed.

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25 W

30 W

50 W

64 W

In L-C parallel circuit the capacitor draws a

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Lagging current

Leading current

Lagging voltage

Leading voltage

When a positive charge is allowed to move from positive to negative plate, then it will gain

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P.E.

K.E

Gravitational energy

Electrical P.E.

Which of the following material could be used for a high vacuum, high voltage tube.

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Thoriated tungsten

Tungsten

Copper

Cesium

Efficiency of a half wave recitifier is.

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Almost negigible

More than full wave rectifier

Less than full wave rectifier

Equal to full wave rectifier

In the equation P = IV cos Theta Cos theta is known as

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Phase angle

Liming angle

Phase

Power factor

The highest value reached by the voltage or current in one cycle is its.

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Top value

Maximum value

Average value

Peak value

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