Question # 1

For the angular momentum of a system to remains constant, the external torque should be

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small

Large

Neither small nor large

zero

The combined effect of resistance and reactance's in A.C. circuit is called.

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Resistance

Conductance

Choke

Impedance

The transition of inner shell electrons in heavy atoms gives rise to the emission of.

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Low energy b-particle

High energy b-particle

High energy X- rays

High energy gama rays

The resistance of a capacitor when it is connected with a battery is.

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Zero

Finite

Infinite

The same

Bohr's atomic model assumes

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Nucleus is of infinite mass and is at rest

electron in a quantized orbit will not radiate energy

Mass of electron remains the same

All of the above

A man in an elevator ascending with an acceleration will feel that his weight.

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Has increased

Has decreased

Remains the same

Vanishes

A water wave is an example of

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Electromagnetic wave

Longitudinal wave

Transverse wave

Reverberation

The photons emitted in inner shell transition are.

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Alpha particle

Beta particle

Gama particle

Characteristic X-rays

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

The variation in the speed of sound with temperature is greater in.

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Gases

Metals

Liquids

Insulators

The pitch of sound a determined by its

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Speed

Frequency

Direction

Number of beats

In potential for the material of cathode pure metals are rarely used because of their

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Low reflecting power

High reflecting power

Low resolving power

High resolving power

If the K.E. of a body becomes 4 times of its initial value, the new momentum will be

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half

Same

Double

4 times

Which of the following is most suitable for the core of the electromagnetism

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Air

Steel

Su Ni allow

Soft iron

If the number of coulombs per second through a wire of 10 Ohm resistance across a 120 V line is 12, the current is

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5 A

10 A

12 A

15 A

Both xenon and cesium each have

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24 isotopes

28 isotopes

32 isotopes

36 isotopes

The change in entropy for any reversible cycle is identically

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Infinite

Positive

Negative

Zero

When a man jumps off the ground, the reaction force of the ground is.

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Equal to the weight of the man.

Smaller than the weight of the man

Greater than the weight of the man

Zero

A given mass of air occupies 12 m2 at normal atmospheric pressure if the pressure is increased to 4 times the original value without changing the temperature what volume will the air occupy.

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3 cm3

6 cm3

9 cm3

12 cm3

The vertical component of earth's magnetics field is zero.

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At magnetic poles

At geographical poles

At magnetic equator

Everywhere

Which of the following material could be used for a high vacuum, high voltage tube.

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Thoriated tungsten

Tungsten

Copper

Cesium

X-rays are good for imagining

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Tendons

Brain

Bones

Heart

In a spectrometer experiment monochromatic light is incident normally on a diffraction gratin having 4.5 x 10⁵ lines per metre The second order line is seen at an angle of 30^o to The normal What is the wavelength of the light.

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430 nm

556 nm

589 nm

625 nm

The light rays which combine destructively would mean that resultant

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Intensity increases

Intensity decreases

Amplitude increases

Amplitude decreases

When a body acceleatres.

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Its direction always chances

It mass always changes

It velocity always changes

It falls towards the earth

The proportion of crystalline to amorphous regions in a polymer depends on its

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Chemical composition

Molecular arrangement

Physical state

Chemical composition and molecular arrangement

The radius of first Bohr's orbit for hydrogen atom is.

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0.53 m

0.53 nm

0.053 nm

0.53 mm

What is the emission of light by a substance that has observed light or others electromagnetic radiations of a difference wavelength.

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Fluorescence

Illuminance

Luminance

Incandescence

The electron behave an waves because

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They can be diffracted by a crystal

They can produce ions in gases

They can be deflected by magnetic field

They can be deflected by electric field

The SI unit of solid angle is

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Degree

Radian

Steradian

Candala

Which of the following has teh maximum permeability.

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Paramagnetic substances

Ferromagnetic substances

Diamagnetic substances

Iron oxide

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