Question # 1

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

A typical rocket consumes fuel about

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40000 Kgs-1

30000 Kgs-1

20000 Kg s-1

10000 Kgs-1

Waves transport energy without transporting

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Matter

Force

Momentum

All of these

Which is the example of vector quantity

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Torque

Speed

Density

Work

When a body is vibrating its displacement from mean position

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Remains constant

Changes with time

Become(-)ve

None of these

The speed of sound is greater in solids due to their high.

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Density

Pressure

Temperature

Elasticity

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

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Regenerator

Generator

Repeater

Diode

Time period of geostationary satellite of radius 'R' is

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1 hour

48 min

1 day

1 month

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 force of 10 N acts on a body of mass 5 kg in one second. The change in its momentum will be.

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10 kgms-1

50 kg ms-1

2 kg ms-1

20 kg ms-1

If heat engine absorb 400 J and rejects 200 J heat energy, its efficiency will be.

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25%

50%

70%

100%

Time rate of change of angular displacement is called

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Linear velocity

Angular velocity

Rotational velocity

Vibrational velocity

The frictional force is

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Conservative force

Non conservative force

Electric force

Magnetic force

A body of mass 2 kg moving with velocity of 4 ms-1 has K.E. equal to.

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16 J

8 J

32 J

2 J

A vector is denoted by

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Light face

Bold face

Both a and b

None of these

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

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7 N

5 N

4 N

1 N

No spark plug is needed in the

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Petrol engine

Diesel engine

Gas engine

Water engine

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