Question # 1

A generator produces 100 kW of power of a potential difference of 10 kV the power is transmitted through cables of total resistance 5 Homs How much power is dissipated in the cables.

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50 W

250 W

500 W

5,000 W

A D.C Motor converts

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Mechanical energy into electrical energy

Mechanical energy into chemical energy

Electrical energy into mechanical energy

Electrical energy into chemical energy

Which given material is the best for making connecting wires

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Nichrome

Iron

Gold

Copper

What happens to a soap bubble, when some charge is given to it.

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It collapses

It increases in size

It decreases in size

It feels nothing

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

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Kinetic energy

potential energy

Electric current

Charge energy

What type of current is produced by batteries.

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Direct current

Alternating current

Pulsating current

Convection current

The instantaneous voltage across a pure inductance.

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Leads the current by 90 ^o in phase

Lags the current by 90 ^o in phase

Is in phase with the current

Leads the current by a phase angle which depends on the frequency

Tesla is the unit for measuirng

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Magnetic intensity

Magnetic induction

Magnetic moment

Electric potential

The magnetic force is simply a

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Reflecting force

Deflecting force

Restoring force

Gravitational force

A steel of which material should be placed between the plates of a parallel plate capacitor in order to increase its capacitance.

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tin

Iron

Copper

Mica

Which factor remains constant in a transformer.

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Current

Voltage

Power

Frequency

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.

Which quantity decay exponentially when a capacitors is discharged.

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Charge only

Charge and voltage only

Charge and current only

Charge voltage and current

The free electron theory explains conduction in

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Insulators only

Metals only

Semi conductor only

Non metals only

The ratio of average induced emf to the rate of changing of current in the coil is called.

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Self induction

Mutual induction

Self inductance

Mutual inductance

If a resistance is connected in parallel with a galvanometer the resulting instrument is called.

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A voltmeter

An ammeter

A wattmeter

A potentiometer

A pure capacitor is connected in an AC circuit The power factor of the circuit will be.

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Unity

Infinity

0.5

Zero

The steady current which produces the same heating effect in a resistance in a given time as the alternating current does in the same resistance in the same time is called.

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Induced current

Root mean square value of an alternating current

Mean value of alternating current

Electromotive force

Photo diodes are used as

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Optical fibre receivers

Automatic switching

Logic circuits

All of the above

Which incapability of the materials is represented by the phenomenon of hysteresis.

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Magnetic saturation

Low susceptibility

Retrace the path

Orientation

The core of a transfer is made of iron because

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Iron is a good electric material

Iron is cheaper than copper

Iron is easily magnetized and demagnetized

Iron makes a good permanent magnet

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