Question # 1

Smaller the damping, greater will be the

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frequency

wavelength

amplitude

none of them

Unit of impulse in

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Newton

Kg m

Kg m/s

Joule

A body moves a distance of 10 m along a straight line under the action of a force of 5 N and work done is 25J. the angle which the force makes with the direction of motion will be:

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60°

90°

30°

0°

The vertical component of velocity of a projectile during its motion is minimum

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at the time of projection

at the highest point

just before hitting the plane of projection

all of them

In Bernoulli's theorem the relation between velocity and pressure is

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Inverse

Direct

None of the above

Both a and b

If m is the mass of the gases ejected per second with velocity v relative to the rocket of mass M, then the acceleration of rocket is

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a = M/mv

a = mM/v

a = mv/M

a = v/mm

The product of the pressure and volume of an ideal gas is

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A constant

Approximately equal to the universal gas constant

Directly proportional to its temperature

Inversely proportional to its temperature

The nucleous of uranium -235 differs from a nucleous of a uranium -238 in that the later contains

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3 more neutrons

3 more electrons

3 more protons

3 more ions

The frequency of free vibrations is known as

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free frequency

forced frequency

natural frequency

un-natural frequency

The efficiency of petrol engine is usually not more than 25% to 30% because of

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friction

heat losses

both of them

none of them

The Phenomenon of generation of induced emf is called

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Electrostatic induction

Magnetic induction

Electromagnetic induction

Electric induction

Both A and B

In super conductors, once the current is established it exists

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1 day

30 days

indefinitely

None of these

The central point in the Newton's rings is dark due to

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Destructive interference

Constructive interference

Additional of path difference λ/2

b and c

The product of mass flow per second with velocity is

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Momentum

Acceleration

Force

Displacement

A glass plate on which a large number of very fine equidistant parallel lines are drawn is called

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convex lens

thin film

diffraction grating

interferometer

The splitting of white light into several colors on passing through a glass prism is due to

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Refraction

Reflection

Interference

Diffraction

A motor operates at 20 rev/s. What is power delivered by it? If it supply a torque of 75 Nm

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75 W

85 W

90 W

9.4 x 10³W

According to the Hooke's law the force required to change the length of a wire by '1' is proportional to:

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1^-2

1^-1

1

By which principle we can locate the position of new wavefront after a later time?

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principle of irreversibility

principle of light

Archimedes principle

Huygen's principle

A human eye can detect the electromagnetic radiations of the type:

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Infrared radiations

For- infrared radiations

X-rays radiations

Red radiations

The measure of the deformation of a solid is called

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Stress

Strain

Elastic constants

None of these

1 cal = __________

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11.184Joule

2.184Joule

3.184Joule

4.184Joule

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