Question # 1

The critical angle for glass to:

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24^o

48^o

42^o

50^o

In electric motor, the brushes are made of:

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Lead

Graphite

Iron

Wood

When an electric current passes through a conductor, which field is produced around it?

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Electric field

Magnetic field

Gravitational field

Electrostatic field

Which is the best material for making connecting wires:

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Iron

Copper

Tungsten

Nickel

The phenomenon in which radiations convert the matter into positive and negative ions is called:

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Radio activity

Excitation

Ionization

Electrolysis

The sound level of rustling of leave is:

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1 dB

20 dB

30 dB

10 dB

An object is placed at the Centre of curvature of a concave mirror. The image produced by the mirror is located:

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Out beyond the centre of curvature

At the centre of curvature

Between the centre of curvature and the focal point

At the focal point

an ideal voltmeter is that which draws:

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small current

no current

high current

none of these

At extreme position potential energy of the pendulum is

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Maximum

Miimum

a and b

zero

The maximum displacement from mean position is called:

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Maximum height

Time period

Amplitude

Intervel

The converter of analogue to digital signal is:

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ADC

DAC

ATDC

None of these

The half -life of carbon is

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5730 years

5700 years

5720 years

572 years

In a vacuum all electromagnetic waves have the same:

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Speed

frequency

amplitude

wavelength

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