Question # 1

Which one is not produced by sound waves in air?

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Polarization

Diffraction

Refraction

Reflection

The basis to define a temperature scale that is independent of material properties is provided by

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carbon cycle

nitrogen cycle

Carnot cycle

irreversible cycle

The state in which ice, water and vapour coexists in equilibrium is called

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zero degree celsius

zero degree fahrenheit

absolute zero

373 K

A ball is thrown upwards with a velocity of 100 m/s. It will reach the ground after

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10 s

20 s

5 s

40 s

A stone tied to the end of a 20 cm long string is whirled in a horizontal circle. If centripetal acceleration is 9.8 m/sec², then its angular velocity is rad/sec is:

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22/7

7

14

21

In an adiabatic process the work is done at the expense of the

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energy supplied to the system

energy gained from the surroundings

internal energy

none of them

The body will move with terminal velocity when it acquires

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minimum speed

zero speed

maximum speed

none of them

The number of protons inside a nucleus is called

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mass number

atomic weight

atomic number

none of these

The root mean square voltage for alternating current is

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All of these

If d is the displacement of the body in time t, then its average velocity will be

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V_av= d x t

V_{av = t/d}

V_{av = d/t}

If a freely oscillating system is subjected to an external force, then

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free vibrations will take place

the body will move with its natural frequency

forced vibrations will take place

none of them

The conventional source of energy is

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Geothermal energy

Solar energy

Hydroelectric energy

None of these

By the fermentation of biomass using enzymes and by decomposition through bacterial action in the absence of air, we obtain

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Biogas

Ethanol

Benzene

None of these

If a lens is cut into two piece perpendicular to the principal axis and only part is used the intensity of the image:

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Remains same

1/2 times

2 times

Infinite

The length of the standard metre measured by Michelsion's interferometer comes out to be

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1,553, 163.5 wavelength

1553.5 wavelength

155316.5 wavelength

none of them

Dimensions of refractive index

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[M°L°T°]

[MLT]

[ML^-1T^-1]

None

The ultra-purity of optical fibre is

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90 %

99 %

99.9 %

99.99 %

At what point/points in its path does a projectile have its maximum speed ?

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At the point of projection

At the point where its strikes the ground

Both

None of these

Huygen's wave front which sends out secondary wavelets with a speed equal to

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Speed of propagation of the wave

Speed of propagation greater than wave

Speed of propagation less than the wave

None of these

Bodies falling freely under gravity provide good example of motion under

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non-uniform acceleration

uniform acceleration

variable acceleration

increasing acceleration

Who confirm the wave theory of light ?

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Newton

Michelson

Newton

Thomos Young

Two forces of 4 dyne and 3 dyne act upon a body.The resultant force on the body can only be

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Between 3 and 4 dyne

Between 1 and 7 dyne

More than 3 dyne

More than 4 dyne

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