Question # 1

The initial velocity of a body moving along a straight line in 7 m/s. It has a uniform acceleration of 4 m/s². The distance covered by the body in the 5th second of its motion is

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25 m

35 m

50 m

85 m

The smooth or steady stream-line flow is know as

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Laminar flow

Turbulent flow

Both a and b

None of the above

How much water a pump of 2kW can raise in one minute to a height of 10 m, take g = 10 m/s²?

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1000 liters

1200 liters

100 liters

2000 liters

A particle moving in a magnetic field has increase in its velocity, then its radius of the circle

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Decreases

Increases

Remains the same

Becomes half

One cannot see fog because

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Fog absorbs light

The refractive index of fog is infinity

Light suffers total reflection at the droplet in a fog

Light is scattered by the droplet in fog

A lens behaves as a converging lens in air and a diverging lens in water. The refractive index of the material is

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Equal to unity

Equal to 1.33

Between unity and 1.33

Greater than 1.33

In Which case does the potential energy decreases?

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On compressing a spring

On stretching a spring

One moving a body against gravitational force

One the rising of an air bubble in water

A point charge Q is placed at the mid-point of a line joining two charges, 4q and q. If the net force on charge q is zero, then Q must be equal to

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-q

+q

-2q

+4q

If 2.2 kilowatt power is transmitted through a 10 ohm line at 22000 volt, the power loss in the form of heat will be

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0.1 watt

1 watt

10 watt

100 watt

Blood has a density

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Equal to water

Greater then water

Lesser then water

None of these

The velocity of falling raindrops attains limited value because of

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Up thrust of air

Viscous force exerted by air

Surface tension effect

Air currents atmosphere

Two sources of sound are said to be coherent if

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They produce sounds of equal intensity

They produce sounds of equal frequency

They produce sound waves vibrating with the same phase

They produce sound waves with zero or constant phase different all instant of time

All of the following statements are correct except

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The total focal length of astronomical telescope is the sum of the focal lengths of its two lenses

The image formed by the astronomical telescope is always erect because the effect of the combination of the two lenses is divergent

The magnification of an astronomical telescope can increases by decreasing the focal length of the eyepiece

The magnifying power of the refracting type of astronomical telescope is the ratio of the focal length of the objective to that of the eye piece

When the length of a microscope tube increase, its magnifying power

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Decreases

Increases

Does not Change

May increase or decrease depending on the observer and the place of observation

A photocell with a constant p.d. of V volt across it illuminated by a point source from a distance of 25 cm. When the source is moved to a distance of 1m, the electrons emitted by the photocell

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Carry 1/4th their previous energy

Are 1/16th as numerous as before

Are 1/4th as numerous as before

Carry 1/4th their previous momentum

A ten-ohm electric heater operates on a 110 V line. Calculate the rate at which it develops heat in watts:

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1310 W

670 W

810 W

1210 W

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