Question # 1

When a potential of 10 volt is applied across a conductor, a current of 5 miliampere flows through it, the resistance of the conductor will be:

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200 ohm

2000 ohm

0.2 ohm

0.002 ohm

A positive electric charge:

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Attracts other positive charge

Repels other positive charge

Attracts a neutral charge

Repels a neutral chage

If one of the resistors in a parallel circuit is removed, the total resistance will be:

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Doubled

Decreased

Increased

Remain same

Which is the unit of energy:

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KWh

Electron volt

Joule

All of above

The current which changes its direction is called:

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Current

A.C.

Conventional current

D.C.

Level of noise recommended in eight, hour work day:

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80-90 dB

80-85- dB

85-90 dB

90-95 dB

The output of a NAND gate is 0 when:

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Both of its inputs are 0

Both of its inputs are 1

Any of its inputs is 0

Any of its inputs is 1

The cathode ray oscilloscope consists of main parts:

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Two

Three

Four

Five

Public address system is the example of :

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Analogue electronics

Digital electonics

Binary system

None of these

The distance between principal focus and pole of mirror is called:

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Princpal focus

Focal length

P

Image

What does a switch do:

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Oppose the current

Open and close the circuit

Store energy

Provide voltage

The shape of magnetic lines of force in case of a straight current carrying conductor is:

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Eliptical

Trangular

Rectangular

Circular

Sound waves having frequency lower than 20 Hz are called:

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Ultrasonic

Infrasonic

Audible

Echo

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