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

A Carnot engine has an efficiency of 50% when its sink temperature is at 27 ^oC. The temperature of source.

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273^oC

300 ^oC

327 ^oC

373 ^oC

The regular or steady flow of fluid is called

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Stream line

Turbulent flow

Average flow

None of these

For a gas obeying Boyle's Law, if the pressure is doubled, the volume becomes.

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Double

Three fold

One half

Remains the same

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

With increase of temperature, speed of sound.

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Remains constant

Becomes zero

Decreases

Increases

A typical diffraction grating has certain number of lines per centimeter whose range is.

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40 to 50

400 to 5000

400 to 500

4000 to 5000

If 20 waves passes through he medium in 2 sec of 10 ms-1 then he wavelength is.

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200 m

2 m

1 m

0.5 m

Bending of light around the edges of an obstacle is called.

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Refraction

Polarization

Interference

Diffraction

Time period of geostationary satellite of radius 'R' is

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1 hour

48 min

1 day

1 month

For angular momentum of system to remain constant, external torque should be.

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Small

Large

Zero

None

A gas performs 10 J of work while expanding adiabatically. the change in its internal energy is.

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10 J

-10 J

100 J

-200 J

The subtraction of a vector is equivalent to the addition with

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Same direction

Perpendicular direction

Reversed direction

All of these

The diver spins faster when moment of inertia becomes.

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smaller

Greater

Constant

Zero

Transformation of heat other forms of energy is discussed in

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Thermal physics

Thermodynamics

Atomic physics

Nuclear physics

Young in 1801 performed experiment for the first time about

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Interference

Diffraction

Polarization

Particle nature of light

Sodium chloride in a flame gives

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Green light

White light

Red light

Yellow light

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