Question # 1

Viscosity is defined as

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the friction between fluid and its container's walls

the internal friction between two layers of fluid

the resistance to flow a fluid experiences

the extent to which outside factors effect the fluid's flow

The artillery shells travel along parabolic paths under the influence of

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magnetic field

electric field

electromagnetic field

gravitational field

When a bicycle is in motion but not pedaled, the force of friction exerted by the ground on the two wheels is such that it acts

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In the backward direction on the front wheel and in the forward direction on the rear wheel

In the forwards directions on the front wheel and in the backward direction on the rear wheel

In the forward direction on both the wheels

In the backward direction on both the wheels

Range of a projectile is R, when the angle of projection is 30° . Then, the value of the other angle of projection for the same range, is

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45°

60°

50°

40°

A ball is dropped from a height of 4.2 meters. To what height it will rise if there is no loss of KE after rebounding?

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4.2 m

8.4

12.6

None of these

The value of electrical constant of proportionality k is

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9 x 10⁹Nm²C^-2

9 x 10^-9Nm²C^-2

9 x 10¹⁰Nm²C²

9.85 x 10^-12N^-1C^-2

The quantity F x t is called as

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momentum

velocity

acceleration

impulse

The force applied on unit area to produce any change in the shape, volume or length of a body is known as

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strain

elasticity

stretching

stress

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

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classical mechanics

Newtonian mechanics

quantum mechanics

statistical mechanics

The unit of work in CGS system is

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Joule

Erg

Dyne

Watt

In the production of beats by 2 waves of same amplitude and nearly same frequency, the maximum intensity to each of the constituent waves is

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Same

2 times

4 times

8 times

An ideal heat engine can only be 100% efficient if its exhaust temperature is equal to

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0°C

0k

100°C

Temperature of source

Diameter of the nucleus is of the order of

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10^-10m

10^-12m

10^-15m

10^-18m

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Initial velocity

Variable velocity

Instantaneous velocity

None of these

A wider objective and the use of blue light of short wavelength produces

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Interference

Diffraction

Less diffraction

Polarization

In a cubic crystal, all the sides meet at:

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60°

90°

109°

30°

10°

Femto means

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10^-15

10^-18

10^-2

10^-12

Uniform acceleration is defined as

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Average acceleration

Instantaneous acceleration

Equal change in velocity and time

None of these

Selenium is an

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Insulator

Conductor

Semiconductor

Photo conductor

The value of coefficient of viscosity in comparison to coefficient of friction is

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Very large

Very small

Nearly same

May be small or large

An electron of charge e coulomb passes through a potential difference of V volts,its energy in 'joules' will be

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V/e

eV

e/V

V

Mathematically, the instantaneous acceleration is represented by

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