Question # 1

Beats occurs because of.

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Reflection

Refraction

Interference

Doppler's effect

Wave mechanics was introduced by

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G.P. Thomson

De-Broglie

Heisenberg

Max Planck

Under which of the following conditions current in a circuit is wattles.

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When inductance in the circuit is zero

When resistance in the circuit is zero

When current is alternating

When resistance and inductance both are zero

What is the properly of materials that responds at an atomic or subatomic level to an applied magnetic field.

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Magnetism

electroplating

Diamagnetism

Electrolysis

When a force of 4 N acts on a body of mass 2 kg for a time of 2 s, the rate of change of momentum is.

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2 kg ms -1

4 kg ms-1

8 kg m s-1

16 kg m s-1

Which of the following are defects is lenses.

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Chromatic aberration

Spherical aberration

Astigmation

All of the above

Which of the following cannot be polarized.

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Ultraviolet rays

Radio waves

T.V waves

Sound waves

Which of the following is a non contacting device that intercepts and measures thermal radiation.

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Thermometer

Pyrometer

Voltmeter

Lactometer

Who invented the first closed tube thermometer in 1713

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Gabried Fahrenheit

Galileo

anders Celsius

Lord Kelvin

Periodic motion is a motion.

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Under the influence of an elastic restoring force

That repeats it self in equal intervals of time

Back and forth over the same path

With constant acceleration

When a posirtron is emitted it causes.

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Mass number to increase by one

mass number to decrease by one

Atomic number to decrease by one

Atomic number to increase by one

The maximum stress a solid material can sustain with out undergoing permanent deformation is called.

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elastic limit

Plastic

elastic deformation

Plastic deformation

Ashes from a campfire deep in a cave show carbon -14 activity of only one eighth the activity of fresh wood. How long ago was that campfire made.

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13590 years

15190 years

17190 years

21190 years

On which of the following the object size as perceived by eye depends upon.

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Actual size of the object

Aperture of the pupil

Object distance from the eye

Size of the image formed on the retina

An uncharged di electric body experience a force when placed in an electric field if.

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A field in non zero at the body

The electric is a polar material

The dielectric is a non polar material

The field is non uniform over the body

No current flows between two charged bodies when connected if they have same.

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Charge

Capacity

Potential

Shape

Who devised a technique for the measurement of change on an electron in 1909

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Milikan

Joule

Ampere

Ohm

The specific heat capacity of a substance is the amount of heat required to.

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Raise its temperature by 1 K

Raise the temperature of 1 kg of the substance by 1 K

Melt 1 kg of the substance

Boil 1 kg of the substance

A disturbance that travels through space and time usually accompanied by energy transfer is called.

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sound

Wave

Echo

Frequency

When two identical travelling waves are superposed, velocity of the resultant wave

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Remains unchanged

Decreases

Increases

Become zero

The process of energy generation in sun and stars is.

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Fusion of heavy nuclei

fusion of light nuclei

Fission of light nuclei

Solar panels

The power of a convex lens is 5 D at what distance the object should be placed from the lens so that its real and 2 times larger image is formed.

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25 cm

30 cm

35 cm

40 cm

The wave nature of light was proposed by

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Thomas Young

Fresnel

Maxwell

Huygen

Which one of the following temperature scales is independent of the properties of any particular substance.

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Kelvin scale

Gas scale

Thermodynamic scale

Celsius scale

What is the change in path when sound wave is reflected from a rigid support.

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Lamda /2

Lamda

2 lamda

Zero

The ripple tank is used to study various features of

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Wave phenomenon

Interferences

Doppler's effect

Reverberation

For capacitors connected is series.

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The difference of potential is same for an

The charge on each is the same

The resultant capacitance is greater than

The charge on each is not the same

If work must be done by an outside agent attempting tobring two point charges close together.

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They are of opposite signs

The field is not conservative

The work is recoverable when they separate

The P.E. of the charges is reduced by the amount of the work done

For the normal operation of transistor the emitter base junction is always.

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Zero biased

Reverse biased

Forward bised

Both a and b

The energy of neutrons obtained during a fission reaction is.

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0.1 MeV

1 KeV

1 MeV

Zero

What is the period of geostationary satellite.

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6 hours

12 hours

18 hours

24 hours

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