Question # 1

Difference in the density of two medium when waves are passing from one into another medium always results in the change in.

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Wave speed

Wave direction

Both speed and direction

Wave frquency

If pressure and temperature of an ideal gas is doubled and volume is halved, the number of the gas molecules.

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Become half

Remain constant

Become double

Become three times

A new class of ceramics materials was discovered in.

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1938

1958

1978

1986

X-rays travels ins straight line with velocity

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Less than light

Greater than light

Equal to light

Equal to sound

The capacity of a spherical conductor is numerically equal to its.

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Surface area

Diameter

Radius

Volume

The spacing of electric field lines between two identical point charges of opposite signs

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Is not indication of the field direction

Is not dependent on the magnitude of the charges

Is an indication of the field strength

Is large when the charges are very large

The ratio of the velocity of sound in hydrogen to the velocity of sound in oxygen is

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4:1

16:1

2:1

8:1

The cathode ray oscilloscope is used

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For viewing the wave shape of rapidly changing electric current

As voltmeter

For measuring time intervals between electricalimpulses

All of the above

Charge carriers in thermocouples are.

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Anions

Cations

Electrons

Protons

A particle executing simple harmonic oscillations of frequency 100 Hz has an amplitude of 0.1 cm The velocity amplitude of the particleis.

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20 micro cm s-1

10 micro cm s-1

20 cm s-1

19 cm s-1

The resistance of 10 micro F capacitance, when connected to A D.C. circuit is.

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Zero

Unity

-1

Infinity

The dimensions of strain are.

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[MLT-2]

[ML-1T-2]

[ML-2T-3]

It is a dimensionless quantity

Two convex lenses of equal focal length 'f' are placed in contact, the resultant focal length is

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Zero

1

2f

f/2

Linear acceleration of a point moving in a circle of radius 30 cm with angular acceleration of 0.5 rad s-2 is

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1.5 cm s-2

2.5 cm s-2

10 cm s-1

15 cm s-2

Liquids with disordered structure frozen in are an example of

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Amorphous solids

Glassy solids

Crystalline solids

Polymeric molecules

The part of theory of relativity which deals with accelerated bodies is called.

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special theory of relativity

General theory of relativity

Lorentz's theory of relativity

Galilean theory of relativity

If a gymnast sitting on a rotating stool with his arms out stretched lowers his arms.

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The angular speed increases

The angular speed decreased

The angular speed becomes zero

The angular speed becomes constant

What is the minimum number of thermodynamic parameters required to specify the state of gas system.

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1

2

3

Infinite

At absolute zero of temperature.

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The molecular energy is zero

Molecules have translational K.E

Molecules have rotational K.E.

Molecules have maximum energy

An important property of an ideal power supply is.

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Infinite internal resistance

Zero internal resistance

Large output resistance

Small output resistance

If there are no frictional effects, the mechanical energy of a system executing simple harmonic motion.

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Changes with time

Is variable

Is constant

Is not conserved

Kinetic and potential energies are

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Not inter convertible

Inter convertible

Two forms of torque

Not related with each other

The magnus effect is equivalent to

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Bernouli's theorem

Archimedes principle

Pascal's law

Blood pressure

Which of the following radiations will burn human skin

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Infrared

Ultraviolet

X rays

Alpha particles

What is world's average surface air temperature.

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5 ^oC

10^oC

15 ^oC

20 ^oC

X-rays are not used in RADARs because

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They are not reflected by the target

they are not completely absorbed by air

They damage the target

They are reflected by the target

As the mass number increases, the binding energy per nucleon in a nucleus

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Increases

Decreases

Remain constant

Varies in a way that depends upon A

The direction of electric field line surround the test charge -q id

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Parallel

Perpendicular

Radially outward

Radially inward

How power factor of a circuit can be improved.

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Using capacitors

Using cokes

Using resistors

All of these

Beats occurs because of.

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Reflection

Refraction

Interference

Doppler's effect

Who measured the intensity of emitted energy with wavelength radiated from a blackbody at different temperature.

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Lummer

Pringsheim

stefan

Both a and c

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