Question # 1

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 law states that an induced current is always in such a direction as to oppose the motion or change causing it.

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Ampere's law

Gauss's law

Lenz's law

Kirchoff's law

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

Two charged spheres are separated by 2 mm Which of the following would produce the greatest attractive force.

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+1 q and + 4 q

-1 q and -4 q

+2 q and +2 q

+2 q and -2q

The unit of time constant RC is.

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Second

second-1

Second -2

Second 2

A capacitor is connected to a battery The fore of attraction between the plate when the separation between them is halved will

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Remain the same

Become twice

Become 4 times

Become 8 times

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 of the following quantity in analogous to temperature in electricity.

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Charge

Resistance

Inductances

Potential

The ration of intensity of magnetization to the magnetic force is known as.

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Parmeability

Magnetic induction

Magnetic intensity

Magnetic susceptibility

Eddy current can be minimized by

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Moving the conductor rapidly

Moving the conductor slowly

Using a metallic core

Using a laminated core

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

The relation between the voltage and current that flows in a resistor is.

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V = 1/R

R = vi

V = I2 R

I = V /R

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

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Amplification

_Filtration

Rectification

Saturation

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.

Coulomb found that the mutual force between tow electric charges varies.

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Inversely as the distance

Inversely as the square of the distance

directly as the distance

Directly as the distance squared

A heater which is to be used on a 250 V mains circuit, has a 5 A fuse in its plug Which of the following is the most powerful heater that can be used with this fuse.

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150 W

500 W

1,000 W

2,000 W

Which device converts alternating current to direct current.

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Motor

Generator

Transformer

Rectifier

Which equation in electromagnetism describe the magnetic field B generated by an electric current.

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ampere's circuital law

Bio savart law

Gauss's law for electromagnetism

Coulomb's law

The resistance of a capacitor when it is connected with a battery is.

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Zero

Finite

Infinite

The same

The electric bulb does not obey Ohm's law because.

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Current changes

Resistance changes

Heat is produced

All of these

The advantage of LEDs over filament lamp is their

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Small size

Reliability

High operating speed

All of the above

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