Question # 1

Which of the following is scalar quantity?

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Electric potential

Velocity

Momentum

Force

1 amu is equal to.

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1.66 x 10^-24kg

1.66 x 10^-19kg

1.66 x 10^-24kg

1.66 x 10^-27kg

The smooth or steady streamline flow is known as

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laminar flow

turbulent flow

both of them

none of them

The net force acting on a 100 kg man standing in an elevator accelerating downward with a = 9.8 m sec^-2comes out to be

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980 N

580 N

1380 N

Zero

The size of the domain is such that they can contain

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10²to 10⁴atoms

10⁴ to 10⁸atoms

10⁸to 10¹²atoms

10¹²to 10¹⁶atoms

Absolute zero is considered as that temperature at which:

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All liquid become gases

All gases become liquid

Water freezes

None of these

Which of the following can become a good temporarily magnet

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iron

steel

both of them

none of them

The resistance of the given conductor can be increased by

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Increasing the area

Changing resistivity

Decreasing the length

None of the above because change does not matter because in any case the volume remains the same

Wave nature of particle was proposed by

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Einstein

Plank

De-Brogile

Max well

In the study of thermodynamics, which gas is considered as the working substance

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real gas

ideal gas

any gas may be ideal or real

none of them

If the water falls from a dam into a turbine wheel 19.6 m below, then the velocity of water at the turbine, is (Take g=9.8 m/s²)

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9.8 m/s

19.6 m/s

39.2 m/s

98.0 m/s

Compton shift refers to:

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Photon

Meson

Proton

Positron

Both (B) and (D)

Work done on a body by gravity in lifting it up to certain height is

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Maximum

Minimum

Zero

Negative

In a semi-conductor material, current flows due to

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positive charge

negative charge

both of them

none of them

Silicon can be obtained from

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Lead

Uranium

An isotope of oxygen

Sand

The gavanometer constant of a moving coil galvanometer is given by

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K=BAN/C

K=BN/CA

K=NAC/B

K=C/BAN

The ratio of the diameter of two convex lenses is _____-the ratio of their focal lengths:

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Greater than

Less than

Equal to

None of these

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

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p-n-p transistor

n-p-n transistor

either of these

none of these

If the ratio of densities of two gases is 1:4, then the ratio of their rates of diffusion into one another is

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2 : 1

4 : 1

1 : 4

3 : 4

In case of constructive interference of two waves, the amplitude of the resultant wave is _______ either of the waves:

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Greater than

Equal to

Smaller than

None of these

The wave form of S.H.M will be

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square wave

sine wave

rectified wave

saw-tooth wave

The RMS value of alternating current is:

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0.7 times at the peak value

0.5 times the peak value

0.7 times the Instantaneous value

Equal to maximum voltage

None of these

Atoms of hydrogen gas can be excited by passing electric current through it when the gas is filled into the discharge tube at a pressure which is

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Less than atmospheric pressure

Much less than atmospheric pressure

Greater than atmospheric pressure

Much greater than atmospheric pressure

Both C and D

The mass of fluid passing through any cross-section per unit time is called

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electric flux

magnetic flux

mass flux

none of them

An alpha particle is accelerated through a potential difference of 10⁶volt. Its kinetic energy will be

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1 MeV

2 MeV

4 MeV

8 MeV

At constant temperature, if the density of the gas is increased, its pressure will:

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One kg of a substance

Unit volume of a substance

One mole of a substance

None of these

The distance covered by a body in unit time is called.

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Displacement

speed

Velocity

Both B and C

The magnetic field inside a solenoid can be increased by:

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Increasing n

Decreasing I

Increasing I

By using iron core within solenoid

All correct except (B)

A body with frequency of would complete one vibration in:

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f seconds

1/f seconds

1 second

f²second

Two forces of 10N and 8N are applied simultaneously to a body. The maximum value of their resultant is:

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20 N

-2 N

18 N

36 N

Which force is not a conservative force?

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Frictional force

Gravitational force

Electric force

Elastic spring force

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