Question # 1

The sensitiveness of a moving soil galvanometer can be increased by

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Decreasing the number of turns of the coil

Decreasing the area of the coil

Increasing the couple per unit twist of the suspension

Increasing the magnetic flux

The resistance offered by one cubic meter of a substance is known as.

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Reactance

Conductance

Conductivity

Resistivity

If we double both the current and the voltage in circuit while keeping its resistance constant the power.

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Remains unchanged

Halves

Doubles

quadruples

Which of the following is most suitable for the core of the electromagnetism

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Air

Steel

Su Ni allow

Soft iron

The source of magnetic field are

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Isolated magnetic poles

Electric charge distributions

Current loops

Solenoids

Conductance is the reciprocal of

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Inductance

Capacitance

Resistance

Admittance

The unit of magnetic induction is.

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weber -metre

weber -metre 2

weber-meter-2

weber-metre-1

It is sometimes necessary to protect electrical apparatus from magnetic field This can be done by surrounding the apparatus with a box made from.

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Aluminum

Iron

Steel

Rubber

Lines of force are imaginary lines drawn so as to be energy point.

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parallel to equipotential surface

Normal to the electric field

Indicative of the position of the nearest source charge

Tangent to the electric field

Charge carriers in thermocouples are.

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Anions

Cations

Electrons

Protons

The thermionic current increases when

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Area of filament is decreased

Area of filament is increased

Temperature is decreased

Work function is increased

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

When a dielectric material is placed in an electric field it

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Conducts

Exhibits an electrical discharge

Become polarized

Undergoes electrolysis

Resistance and resistivity of a substance

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Increase with rise in temperature

Decrease with rise in temperature

Remains same at every temperature

Increases at high voltage

The sensitivity of the galvanometer can be increased by increasing the

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Number of turns of the coil

Area of the coil

Strength of the magnetic field

All of the above

Ohm's law is applicable to

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Ohmic and non ohmic devices only

Semiconductors only

Metals only

Insulators only

Which electrical component uses a low current circuit to switch a high current ON or OFF.

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Capacitor

Diode

Reed rely

Thermistor

In modulation, low frequency signal is called

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Fluctuated signal

Loaded signal

Modulated signal

Harmonic signal

For capacitors connected is series.

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The difference of potential is same for an

The charge on each is the same

The resultant capacitance is greater than

The charge on each is not the same

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

The susceptibility of a paramagnetic material is

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negative

Positive

Zero

Infinity

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