Question # 1

To explain his theory Bohr used

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Conservation of linear momentum

Conservation of angular momentum

Conservation of quantum frequency

Conservation of energy

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

As the electron in Bohr orbit of hydrogen atom passes from stat n = 2 to n = 1 the kinetic energy K and potential energy U change as

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K two-fold,U also two-fold

K four-fold,U also four-fold

K four-fold,U two-fold

A person standing on a rotating platform has his hands lowered He suddenly outstretches his arms.The angular momentum

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Becomes zero

Increases

Decreases

Remains the same

At 0° K which of the following properties of a gas will be zero?

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Kinetic energy

Potential energy

Vibrational enegy

Density

Copper and germanium are cooled to 70 K from room temperature then

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Resistance of copper increases while that of germanium decreases

Resistance of copper decreases while that of germanium increases

Resistance of both decreases

Resistance of both increases

The dimensional formula for the modulus of elasticity is same as that for.

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Stress

Strain

Velocity

Surface tension

Two point charge +3μC and +8μC repel each other with a force of 40 N. if a charge of -5μC is added to each of them then the force between will become

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-10N

+10N

+20N

-20N

Two forces of 10N and 15N are acting simultaneously on an object in the same direction. Their resultant is

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Zero

5N

25N

150N

In which case dose the potential energy decreases?

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On compressing a spring

On stretching s spring

One moving a body against gravitational force

One the rising of an air bubble in water

If the dot product of two non-zero vectors vanishes the vectors will be

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In the same direction

Opposite to each other

Perpendicular to each other

Zero

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