Question # 1

Speed of sound in copper is

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38000 ms-1

3600 ms-1

3500 ms-1

3400 ms-1

Size of the molecules is much smaller as compared to the

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Mass of the molecules

Distance between the molecules

Density of the molecules

Volume of the molecules

The drag force increases as the speed of object

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Become zero

Decreases

Increases

Remains constant

A double convex lens acts as diverging lens when the object is

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At infinity

Inside the focus

A way from focus

A a large distance from lens

The optical fibre is covered for protection by

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Glass jacket

Plastic jacket

Steel jacket

Diamond jacket

When water falls from tap, its cross sectional area decrease due to.

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Decrease of speed

Increase of speed

Air pressure

Gravity increase

Which one of the following can not be polarized.

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Ultra violet rays

Radio waves

T.V. Waves

Sound waves

The ratio of size of image and size of object is

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Focal length

Magnification

Resolving power

Principle focus

If the tension a stretched string is made four times then the velocity of wave.

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Remains same

Is halved

Becomes twice

Becomes 4 times

The power needed to lift a mass of 5000 g to height of 1 m in 2 secnd is

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2.45 watt

24.5 watt

245 watt

2.45 watt

Bunsen burner works on the principle of.

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Venturi effect

Terricilli's effect

Bernoulli's effect

None of these

Rate of change of velocity is called

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Speed

Acceleration

Displacement

Torque

Which of the following is mechanical wave

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Heat

Light

Sound

None of these

A layer over the central core of the jacke is called.

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Jacket

Plastic

Cladding

Rubber

A convex lens can be used as

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Simple microscope

Compound microscope

Telescope

Spectrometer

According to Newton, sound travels in air under conditions of.

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Adiabatic

Isothermal

Isobaric

Isochoric

S.I Unit of pressure of gas is.

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Nm

N.m

N2/m

N3m

1 torr in Nm-2 is expressed as.

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130.5 Nm-2

133.3 N m-2

140.2 Nm-2

135.2 Nm-2

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