Question # 1

The necessary condition for nuclear fusion is.

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High temperature and high pressure.

Low temperature and high pressure

Low temperature and low pressure

High temperature and low pressure.

Inserting a di electric between the plates of a charged parallel plate capacitor.

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Decrease the capacitance

Leaves teh capacitance the same

Encourages breakdown between the plates

Reduces the electric intensity between the plates

The amount of heat developed in a resistor is directly proportional to.

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The square of the current only

The resistance of the conductor only

The time of current passing only

The square of current resistance and teh time of current flow

Efficiency of a Carnot engine depends on

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Temperature

Pressure

Volume

The nature of working substance

Entropy of universe is increasing day by da due to.

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Power generating processes

Energy used into work

Depletion of ozone

All of the above

A well known example of an intrinsic semi conductors is.

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Germanium

Phosphorus

Cobalt

Aluminium

The SI unit of decay constant is.

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m

m-1

s-1

N m-1

One rem is equal to.

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0.1 Sv

0.01 Sv

0.001 Sv

0.0001 SV

What is a measure of the total energy of a thermodynamics system.

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Entropy

Enthalpy

Randomness

Chaos theory

The dimensions of stress are

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[MLT-1]

[ML-1 T]

[ML-1T-1]

[ML-1T-2]

The power dissipation in a pure inductive or capacitive circuit is.

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Maximum

Minimum

Zero

Infinity

Velocity of sound in air at a given temperature

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Increases with increase in pressure

Is independent of the pressure

Decreases with increases in density

Increases with increase in density

A small and a large rain drops are falling thgouth all.

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Large drop falls faster

Both move with same velocity

Small drop falls faster

Small drop does not fall

The static friction is.

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Always equal to dynamic friction

Always less than dynamic friction

Always greater than dynamic friction

Sometimes greater and sometimes less than dynamic friction

Why danger signals are made red.

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Our eyes are more sensitive to real colour

Red colour has minimum scattering

Red colour has maximum scattering

Red colour has maximum frequency

Mean free path of gas molecules in inversely proportional to its.

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Weight

Temperature

Pressure

Volume

The charge on a helium nucleus is equal to the charge of.

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Two electrons

Two protons

Two neutrons

One proton

On average there is no energy transfer in.

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Sound waves

Water waves

Standing waves

Mechanical waves

Which law states that a change in the internal energy of a closed thermodynamic system is equal to the difference between the heat supplied to the system and teh amount of work by the system on the surrounding.

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Zeroth law of thermodynamics

First law of thermodynamics

Second law of thermodynamics

Third law of thermodynamics

Any transparent medium bounded by one or two spherical surfaces is called

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Prism

Lens

Plane mirror

Grating

Electricity is transmitted at high voltage rather than at low voltage because.

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It is generated at high voltage

It is safer

It requires less insulation

It wastes less energy

Which of the following quantity is zero about the centre of mass of baody.

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Mass

Acceleration

Moment

Angular momentum

An Alpha particle is the same as

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A helium nucleus

A high speed electron

A hydrogen nucleus

Electromagnetic radiation of short wavelength

Michelson's interferometer can b e sued to find

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Velocity of light

Velocity of sound

Wavelength of light

Wavelength of sound

Since light rays are always diverged by concave lenses such lenses

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Cannot form images

Form only black and white images

From only invented image

Form only erect images

The ratio of intensities of two sound waves is 4 : 9 what will be the ratio of their amplitudes.

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9:4

2:3

3:2

4:9

Which characteristics successively increases in the musical scale.

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Pitch

Quality

Loudness

Amplitude

Which Muslim Scientist gave the first clear description and correct analysis of pinhole camera.

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Nasir al Din Al tusi

Ibn al Haithem

Ibn Ishaqal kundi

al -Khawarizmi

The power of convex lens of focal length 50 cm will be

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1,0 dioptre

2.0 dioptre

4.0 dioptre

5.0 dioptre

The amount of heat needed per unit mass to raise the temperature of a system one degree at constant pressure is numerically aqual to

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The specific heat

The specific thermal energy

The specific heat at constant pressure

the internal energy of the gas

A piece of weighed wood just floats in water when placed in alcohol will

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Float lower

Float higher

Stay as before

Sink

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