Question # 1

The Einstein's changes in length, mass and time are not observed in common life because

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We dont observer then seriously

The masses are too large

Their speed is too small than the speed of right

All of the above

Rate of change of momentum is called

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Impulse

Force

Torque

Momentum

If the external driving force is periodic with a period compareable to the natural period of the oscillator, then we get

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diffraction

beat

interference

resonance

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

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larger

shorter

equal

none of these

The loudness and pitch of a sound note depends on

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Intensity and velocity

Frequency and velocity

Intensity and frequency

Frequency and number of harmonic

Work is always done on a body when:

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A force acts on it

It moves through certain distance

None of A or B is correct

Both A and B is correct

Data transmitted along glass-fiber cables is in the form of pulses of monochromatic red light each of duration 2.5 ns. Which of the following is the best estimate of the number of wavelength in each pulse?

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10³

10⁶

10⁹

10¹²

The entity which measures the quantity of motion in a body is called

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force

energy

momentum

power

Which one of the following causes production of heat when current is set up in a wire?

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Fall of electrons from higher orbits to lower orbits

Inter-atomic collisions

Inter-electron collisions

Collisions of conduction electron with atoms

The half life of uranium-238 is

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6.2 x 10⁹years

4.5 x 10⁹days

4.5 x 10⁹years

1.3 x 10⁶years

The velocity gained by the fluid in falling through the distance (h_{1 - h}_{2) under the action of gravity is equal to the speed of the action of gravity is equal to the speed of the}

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orifices

efflux

fluid

none of them

In the assessment of total uncertainties when power factor is involved, the percentage uncertainty is

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Added

Multiplied by that power

Divided by that power

None of these

When light signal travels along fibres, the power losses are mainly due to

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scattering

absorption

both of them

either of them

Base quantities are those which

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Remain the same

Can be derived

Further divided

None of these

The typical speed of reconnaissance jet (SR-71) is

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900 ms^-1

950 ms^-1

980 ms^-1

990 ms^-1

Spherical aberration can be reduced by using

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Convex lens

All the portions of the lens

Central portion of the lens

Upper portion of the lens

The centre of gravity of an object is

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The point at which the gravity not acts

The point at which the total torque is minimum

The geometrical centre of the body

The point at which the weight of the object seems to act

Which of the following have same SI units

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Force

Impulse

Momentum

b and c

When a meteorite enters into earth atmosphere its energy converts into

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Kinetic energy

Heat energy

Mechanical energy

None of these

When two light waves travelling in the same direction are out of phase at any point, their resultant amplitude

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increases

decreases

remains unchanged

increases rapidly

The study of nature has been classified into branches are:

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Two

Three

Four

None of these

The average velocity of Jupiter in Kms^-1

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25

50

58.4

61.0

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