Question # 1

The velocity of falling raindrops attains limited value because of

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Up thrust of air

Air currents of the earth atmosphere

Surface tension effect

Viscous force exerted by air

The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its

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I_cwill decrease

V_CEwill increase

I_Cwill increase

V_CCwill increase

Certain light of wavelength 600 nm is used to view an object under the microscope. If the aperture of its objective is 1.22 cm, then the limiting angle of resolution will be:

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6 x 10^-5rad

7 x 10^-5rad

8 x 10^-5rad

None of these

The number of input terminals of an op-amp is:

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One

Two

Three

Four

None of these

transverse wave motion is possible in:

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Air

A mixture of NH₃and O₂

Strings

All of these

A body with frequency of would complete one vibration in:

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f seconds

1/f seconds

1 second

f²second

The types of mechanical energy is/are:

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Kinetic energy

Potential energy

Both of these

None of these

The bicycle pump provides a good example of

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first law of thermodynamics

second law of thermodynamics

third law of thermodynamics

none of them

The number of all the protons and neutrons in a nucleus is known as

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atomic number

mass number

charge number

none of these

If denotes the total number of molecules in cubic vessel such that m is mass of each milecule and I is length of each side of vessel, then mN/I³gives the:

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Force

Density

Work done

Pressure

In a transistor, if the central region is n-type, then this type of transistor is known as

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n-p-n transistor

p-n-p transistor

either of these

none of these

When a ray of light goes from a denser medium into a rare medium

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The wavelength of light is decreased

The frequency of light increased

The speed of light is increased

The light undergoes a phase change of π

If a ball comes back to its starting point after bouncing off the wall several times, then its

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total displacement is zero

average displacement is zero

none of them

both of them

An object is placed between two parallel mirrors the number of images formed is

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2

4

8

Infinite

Isothermal temperature Isobaric?

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Pressure

Volume

Heat

Entropy

The time rate of change of displacement is called

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Speed

Velocity

Acceleration

None of these

If 'd' 'm' and fringe spacing ΔY are known, the interference effect due to light of λ

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Cannot be determine

Can be determined in same cases

Can be determined

None of these

The dimensional formula of angular velocity is:

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M^°L^°T^-1

MLT^-1

M^°L^°T^-1

A typical rocket consists of fuel

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more than 60% of launch mass

less than 60% of launch mass

less than 80% of launch mass

more than 80% of launch mass

Waves in ocean are produced due to

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Tidal movement

Winds

Both A and B

Sunlight

The velocity of flow of a liquid through an orifice at the bottom of a tank depends on the

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Density of the liquid

Area of the cross-section of the orifice

Height of the liquid above the office

Height of the orifice from the ground

A wire is stretched to double of its length. Its train is:

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2

1

0

0.5

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