Question # 1

The vertical and horizontal range will be equal id angle of projection is

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76°

45°

60°

120°

The distance travelled byα-particle in a medium before coming to rest, is called

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range ofγ-particle

range of neutrons

range of particle

none of these

Work is a:

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Scalar quantity

Vector quantity

Base quantity

None of these

Surface tension of water is reduced by adding

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Detergents

Camphor

Plastic

Both A and B

When the temperature of source and sink of a heat engine become equal entropy change will be

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Zero

Max

Min

-ve

The time taken by light to travel from moon to earth is:

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80 sec

500 sec

1.802 X 10⁴sec

Aerophysics

If force and displacement are in opposite direction, the work done is taken as:

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Positive work

Negative work

Zero work

Infinite work

Two forces each of 10 N act on a body, if the force are inclined at 30° and 60° respectively with x-axis, then x-component of their resultant is:

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20 N

13.66 N

10 N

8.66 N

The results of mechanical tests are usually expressed in terms of

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stress

strain

stress and strain

neither strees nor strain

The value of relative permittivity of different dielectrics are

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Equal

Different

Greater than one

Smaller than one

Both B and C

Which one the following gives three regions of electromagnetic spectrum in order of increasing wavelength?

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Gamma rays, micro waves, visible light

Radio waves, ultraviolet waves, X-rays

Ultraviolet rays, infrared rays, micro waves

Visible light, gamma rays, radio waves

Terminal velocity is

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Uniform and maximum

Uniform

Maximum

Neither uniform nor maximum

A certain engine coverts 20% of available heat energy into work. Then its efficiency will be:

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20%

80%

50%

None of these

The rate of decay radioactive substance:

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Is constant

Decrease exponentially with time

Varies inversely with time

Decrease linearly with time

If the direction of the applied force is reversed then

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Its torque remain unchanged

The magnitude of its torque changes and direction of the torque remains the same

The magnitude of its torque remains the same but the direction of the torque reverses

Torque is also reversed

Thermal and mechanical equilibrium is maintained all the time so that each process is

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Reversible

Perfectly reversible

Irreversible

None of these

The ability of a body to return to its original shape when applied force is removed is called

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Stress

Strain

Elasticity

All of them

Inertial mass and gravitational mass are

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opposite

identical

identical when there is no friction

all of them

To produce same acceleration in the bodies of masses 10 kg and 20 kg the force applied in the second body should be

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Halved

Equal for both bodies

Doubled

Three times

SI unit of temperature

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Centigrade

Celsius

Kelvin

All of these

The food which we eat in three days produces energy equal to energy from ____ liter of petrol

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1

1/3

3

9

The minimum number of lenses used in compound microscope is

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1

2

3

4

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