Question # 1

When one mirror of a Michelson interferometer is moved a distance of 0.5 mm, 2000 fringes and observed, The wavelength of light used is.

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5000 m

50000 A^o

500 cm

2000 A^o

Symbolically solid angle is represented as

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Sr

rad

0

cd

Pressure 'P' of a gas is defined as

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F/A

FA

F/V

F/D

The period of the earth is equal to

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one lunar day

One astronomical

One Solar day

10 N and 20 N are acting on a body of mass 2 kg the minimum acceleration will be.

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10 ms-2

20 ms-2

60 ms-2

5 ms-2

The final image formed by a simple microscope.

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Virtual and inverted

Real and erected

Virtual and erected

Real and inverted

A stretched string 2 m long and it has 2 hopes of stationary waves hen the wavelength is

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4 m

2 m

3 m

1 m

A vector is denoted by

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Light face

Bold face

Both a and b

None of these

P.E. of a spring is stored in

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Spring

mass

Both of them

None of these

If the temperature of a gas is constant then <1/2 mv2> of the molecules of gas will be.

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Constant

Zero

Increase

Decrease

A bullet shot straight up, return to its starting point in 10 sec. Its initial speed was

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9.8 ms-1

24.5 ms-1

49 ms-1

98 ms-1

A man weight 1000 N in a stationary lift. If the lift moves up with an acceleration of 10 ms-2. then its weight becomes.

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1000 N

2000 N

3000 N

0 N

In transverse waves the particles of medium vibrate

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Along the direction of wave

Opposite to direction of wave

Perpendicular to direction of wave

Slowly

Total change in momentum of an isolated system is

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Always (+) ve

Always (-) ve

Has maximum value

Zero

A ray of light shows the direction of propagation of light It is line which is.

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Normal to the wave front

Parallax to the wave front

Opposite to the wave front

Equal to the wave front

the example of mechanical waves is

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Water waves

Infrared waves

Radio waves

Ultraviolet waves

The value of of 'g' at the centre of the earth is

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Infinite

2 g

3 g

zero

When the body moves with constant acceleration the velocity time graph is

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Parabola

Hyperbola

Straight line

Curve

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