Question # 1

Sound waves can not be

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Reflected

Refracted

Polarized

Diffracted

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 shortest distance between two points is called.

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Speed

Acceleration

Distance

Displacement

The light signal in Opticla fiber must be regenerated by advice called.

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Regenerator

Generator

Repeater

Diode

One mile is equal to

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1.625 km

1.609 km

1.325 km

1.850 km

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.

X-ray diffraction has been very useful in determining the structure of

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Hemoglobin

Stars

Galaxies

Stones

The minimum distance from eye at which an object appears to be distinct is

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Near point

Focal length

Image distance from lens

Object distance from lens

When two waves having same frequency traveling in same direction combine, phenomenon is called

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Wave motion

Combination of waves

Interference

Diffraction

The acceleration of a projectile along x axis is.

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Zero

Increase

Decrease

Equal to 'g'

Which of the following is a set of supplementary units

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Radian and kilogram

Radian and Steradian

Steradian and time

Mole and radian

With increase of temperature, speed of sound.

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Remains constant

Becomes zero

Decreases

Increases

When sound waves enter in different medium, the quantity that remains unchanged is.

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Intensity

Speed

Frequency

Wave length

In stationary waves, the velocity of particle at the node is.

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Maximum

Infinite

Zero

Varible

The work done is isochoric process is.

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Constant

Variable

Zero

Depend upon condition

If 'N' is number of lines rule don the grating having length 'L' then grating element 'd' is given by.

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N/L

2N/L

L/N

N/2L

The study of fluid dynamics is

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Easy

Complicated

Impossible

None of these

If the pressure of a gas is doubled, then speed of sound is.

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Doubled

Become half

Not affected

Increases by four times

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