Question # 1

The direction of vector in space is specified by

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1- angle

2- angle

3- angle

4 - angle

The Detector in Photo phone is made up of.

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Cadmium

Germanium

Selenium

Silicon

An ideal reversible heat engine has

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100% efficiency

Highest efficiency

80%

90%

Which is the process in which temperature of the system remains constant.

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Adiabatic process

Isochoric process

Isothermal process

Isobaric process

For a diatomic gas Cv= 5R/2 then gamma for this gas is.

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5/7

4/35

7/5

35/4

The distinguish between transverse and longitudinal wave_______ is used.

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Refraction

Interference

Diffraction

polarization

Environmental crisis are also known as

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Population crisis

Entropy crisis

War crisis

Mass crisis

No of spark plugs needed in the diesel engine are.

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0

1

2

3

The resultant of two forces 3N and 4 N acting at right angle to each other is.

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5 N

6 N

1 N

7 N

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Angular acceleration is produced by

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Power

Torque

Pressure

Force

The SI unit of power is

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Joule

Newton

Watt

Kilowatt

A bat finding its correct location by sending

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Matter waves

Ultrasonic waves

Infrasonic waves

electromagnetic waves

Increase in the velocity of sound in air for 1 ^oC rise in temperature is.

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61 ms-1

0.61 ms-1

161 ms-1

261 ms-1

Half wavelength corresponds to

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0 ^o

90 ^o

180 ^o

360 ^o

When body acquires terminal velocity them its acceleration 'a' becomes.

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a = 0

a = g

a > 0

a < 0

If the time period of simple pendulum is 2 seconds its frequency will be.

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1 Hz

0.5 Hz

1.5 Hz

2 Hz

In blue light is used as compare to red light then fringe spacing.

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Increase

Decreases

Remain same

Becomes zero

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