Question # 1

Power of electric heater is:

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1500W

4750W

100W

50W

If a ray of light in glass is incident on an air surface at an angle greater than the critical angle, the ray will:

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Refract only

Reflect only

Partially refract and partially reflect

Diffract only

The half -life of carbon is

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5730 years

5700 years

5720 years

572 years

Which animal have ability to move his eye lens:

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Snake

Fish

Ant

Tiger

Sound waves having frequency higher than 20,000 Hz are called:

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Ultrasonic

Infrasonic

Audible

Echo

Static electricity can be generated by:

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Lubrication

Friction

Motion

Smaller the objects

The sensation of sound persists in our brain for:

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0.1 sec

0.01 sec

1 sec

10 sec

What is the power rating of a lamp connected to a 12 v source when it carries 2.5 A?

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4.8 W

14.5 W

30 W

60 W

The converter of digital to analogue signal is:

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ADC

DAC

DATC

DTC

a fuse is connected in series with:

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neutral wire

live wire

earth wire

cable wire

Digital technology is used in:

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Bulb

Radar

Electric motor

All of these

The process by which electrons are emitted by a hot metal surface is

known as:

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Boiling

Evaportion

Conduction

Thermionic emission

In a convex mirror the size of the image:

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Is smaller than the size of the object

Is greater than the size of the object

Depends upon the position of the object

Is equal to the size of the object

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