Question # 1

The Newton's formula for the speed of sound in air is

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A 2 meter of high tank is full of water. If a hole appears at its middle, then the speed of efflux is.

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4.4 ms-1

10 ms-1

6.2 ms-1

20 ms-1

The temperature of human body on Kelvin scale is

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210K

310K

410K

510K

The value of solar constant.

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1.4 kW m-2

1.0 kW m-2

1.6 kW m-2

2 kw m-2

The area between velocity time graph and the time axis is numerically equal to.

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?Speed of object

Distance covered by the object

Average velocity of the object

Acceleration of the object.

Angle between ray of light and wave front is

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0 ^o

60 ^o

90 ^o

120 ^o

The internal energy of a piece of lead when beaten by hammer will.

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Increase

Decrease

Remains constant

Increases and then decrease

When velocity time graph is a straight line parallel to time axis then

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Velocity is zero

Acceleration is constant

Acceleration is zero

Velocity is variable

Food rich in proteins is:

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potato

grapes

vegetables

bread

Hot igneous rocks, usually in molten or partly molten state are found in the depth of

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5 km

10 km

15 km

20 km

If a body of mass 5 kg is raised vertically through a distance of 1 m, then work done is.

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49 J

4.9 J

490 J

0.49 J

Sodium chloride in a flame gives

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Green light

White light

Red light

Yellow light

A constant temperature, if pressure of a given mass of gas is halved, then its volume becomes.

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Halve

Doubled

Four time

Constant

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

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Adiabatic

Isothermal

Isobaric

Isochoric

Which of the following is evidence of wave nature of light

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Interference

Diffraction

Polarization

All of these

The fluid is said to be incompressible, if its density is.

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Zero

Very high

Constant

Very small

The blue colour of sky is due to

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diffraction

Reflection

Polarization

Scattering

If a body is moving in the counter clockwise direction the direction of angular velocity will be

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Toward the centre

Away from the centre

along the linear velocity

Perpendicular to both radius and linear velocity

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