Question # 1

The centre of gravity of a body is

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The centre of the body

The point at the mass of the body acts

The point at which the whole weight of the body acts

The point of rotation

The door of an operating refrigerator in a closed room is opened after sometime the temperature of the room will be

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Lowered

Raised

Unaffected

Become zero

The value of power factor in an LCR sense circuit at resonance is.

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Zero

0.5

unity

Infinity

What is the mean free path in a gas.

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The distance travelled by a molecule before hitting a wall

the average distance travelled by a molecule in one second

the average distance travelled by molecules in one second

The root mean square velocity

Echoes arise from

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Reflection

Refraction

Diffraction

Dispersion of sound waves

The air pressure at the bottom of an air foiling motion is

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Greater than that on the top

Equal to that on the top

Grather than that on the top

Zero

The angular speed of an electron in the nth orbit of Bohr's hydrogen atom is.

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Directly proportional to n

Directly proportional to n2

Inversely proportional to n

Inversely proportional to n2

The best shield against Gama rays would be of

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Heavy water

Aluminium

Iron

Lead

If the cross sectional area of the pipe decreases the speed of the fluid increase according to.

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Venturi relation

Bernoulli's equation

Equation of continuity

Torriculli's theroem

Balmer identified the spectral lines in the spectrum of hydrogen in

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1785

1885

1936

1966

The decay process in which an unstable nucleus splits into two fragments of comparable mass is known as.

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Nuclear fission

nuclear fusion

Radioactivity

Carbon dating

The impedance of a pure anti resonant circuit at resonance is.

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Zero

Unity

Infinity

0.5

The fact that the edge of a shadow formed by a point source of light shining on an object is not sharp is an example of.

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Refraction

Diffraction

Polarization

Dispersion

An important application of the semi conductor is the

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Vacuum tube

Fluroescent tube

Copper oxide rectifier

Battery

If the rate of change of momentum w.r.t Time is zero then

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Momentum is a function of time

Momentums is not conserves

Momentum is constant

The impulse is into he same direction as the momentum

If length of second pendulum becomes four times than its time period will become

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Two times

Four times

Six times

Eight times

Special theory of relativity deals with the events in the frames of reference which move with constant.

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Time interval

Acceleration

Momentum

space interval

A pendulum vibrates with a time period of 1 s which range of sound is produced by it

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Audible

Infrasonic

Ultrasonci

Super sonic

The SI unit of momentum is.

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kg m s-2

kg m2 s-2

kg m s-1

kg s-1

A torch bulb uses a 3 V supply and makes a current of 0.2 A It is switched on for one minute How much electrical energy is used.

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0.6 J

12 J

24 J

36 J

The average K.E. of the molecules of an ideal gas in a closed rigid container is increased by a factor of 4 What happen to the pressure of the gas.

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It remains the same

It increases by a factor of 2

It increases by a factor of 4

It increases by a factor of 8

In which of the following studies x-rays are not helpful.

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Crystal structure

Crystal surface

Crystal symmetry

Crystal atoms

Charge carriers in thermocouples are.

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Anions

Cations

Electrons

Protons

Which scientist announced for the first time that the universe is expanding.

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Einstein

Newton

Edward Hubble

Karl Marx

When a charged particle is moved through a magnetic field if suffers is change in its.

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Charge

energy

Mass

direction of motion

X-rays are a part of electromagnetic spectrum and are characterized by frequencies higher that those of.

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Infrared radiation

Ultraviolet radiation

Far ultraviolet radiation

Far infrared radiation

The perceived fundamental frequency of a sound is called.

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Pitch

Timber

Loudness

Wavelength

The Pressure will be low where the speed of the fluid is

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Zero

High

Low

Constant

The main advantage of step index fiber is.

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The size of the cable

The equality of the cbale

Difference in the wavelengths of signals

All of the above

Which of the following measures how quickly the thermometer liquid mainly because it

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Is coloriess

Is a bad conductor of heat

Does not expand linearly

Has a low boiling point

In a Geiger Marsden experiment why do the great majority of the Alpha particles pass straight through the metal foil.

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Atomic nuclei may contain neutrons

Atoms are electrically neutral

Atoms are largely empty space

Atoms have positively charged nuclei

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