Question # 1

The actual efficiency of property turned petrol engine is.

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20% to 30%

30% to 35%

40% to 45%

25% to 30%

1 torr in Nm-2 is expressed as.

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130.5 Nm-2

133.3 N m-2

140.2 Nm-2

135.2 Nm-2

Hot igneous rocks, usually in molten or partly molten state are found in the depth of

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5 km

10 km

15 km

20 km

Force acting on the piston to move outward is.

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Compressive stoke

Power stoke

All stoke

Exhaust stoke

A collision in which K.E. of the system is not conserved is

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Elastic collision

Inelastic collision

3rd low of motion

None of these

The internal energy of a piece of lead when beaten by hammer will.

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Increase

Decrease

Remains constant

Increases and then decrease

In order to produce beats, the two sound waves should have.

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The same amplitude

Slightly different amplitude

The same frequency

slightly different frequencies.

The SI units of solid angle is

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Streadian

Radian

Degree

None of these

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

Angle between ray of light and wave front is

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0 ^o

60 ^o

90 ^o

120 ^o

Which of the following is mechanical wave

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Heat

Light

Sound

None of these

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

Systematic erro occurs due to

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Instrument

Zero erro of the instrument

Botah a and b

None of these

A system does 600 J of work and at the same time has its internal energy increased by 320 J. How much heat has been supplied.

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28o J

920 J

600 J

200 J

the shortest distance between two points is called.

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Speed

Acceleration

Distance

Displacement

The branch of physics which deals with the study of production, propagation and properties fo sound waes is called.

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Heat and thermodynamcis

Optics

Acoustics

Mechanics

The direction of angular acceleration is

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Along the axis of rotation

Perpendicular to the axis of rotation

Opposite to axis of rotation

None of these

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