Question # 1

Which material has the greatest di electric constant.

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Mylar

Glass

Germanium

Water

In a charged capacitor the energy resides

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In the negative plate

In the positive plate

In the field between the plates

Around the edge of the plates

A device used to measure the strain of an object and it is a type of resistor that changes value with applied strain is a

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thermistor

Strain gauge

Thermocouple

Potentiometer

An electric Heater and a fan are marked 1000 W, 250 V and 100 W , 220 V respectively The resistance of fan is.

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Equal to that of heater

Greater than that of heater

Less than that of heater

Zero

Thermocouple is combination of.

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Thermocouples

Capacitors in parallel

Resistors in series

Ammeter and voltmeter

Why a positively charged object is made neutral by someone touching it.

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Electrons flow from the object

Protons flow onto the object

Protons flow from the object

Protons flow onto the object

Which material has the larges resistivity.

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Silver

Germinium

Amber

Sulphur

Which is the fundamental quantity in electrostatic.

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Electric charge

Electric potential

Electric field

Electric field intensity

What happens to the energy of a charged condenser is plate separation is increased.

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It decreases

It increases

It becomes zero

It remains unchanged

Which electrical quantity has the same units as electromotive force.

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Charge

Current

Potential difference

Power

Since selenium becomes conductor in light so it is.

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Photoconductor

Photocell

Thermistor

Photodiode

Why does a transformer have a core made of iron.

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Iron has a high melting point

Iron is a magnetic material

Iron potential and high current

Iron is a conductor of electricity

The Step up transformer

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Increase the input current

Increases the input voltage

Has more turns in the primary coil

Has less time in the secondary coil

Which material has the highest magnetic susceptibility.

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Steel

Brass

Iron

Wood

In open circuit electromotive force equal to

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Current

Resistance

Voltage

Inductence

When two point charges of equal magnitude and opposite sign exist very close to one another the arrangement is called.

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An electric dipole

An amperian current

A null charge

A neutral source

The doped semi conductor materials are called

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Pure semi conductors

Poor semi conductors

Super conductors

Extrinsic semiconductors

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

An A.C. dynamo operates on the principle of

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Mutual induction

Self induction

Electromagnetic induction

Mechanical induction

The cathode ray oscilloscope is used for

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Displaying the waveform of given voltage

Displaying the wave form of given vibrations

Rectifying a.c to d.c.

Rectifying D.C. to A.C.

The output of a generator which uses a split ring commutator is.

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sinusoidal A.C. wave

Pulsating D.C. wave

Constant D.C Voltage

Linerly increasing voltage.

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