Question # 1

Neutron was disvovered by:

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Rutherford in 1920

Chadwick in 1922

Bohr in 1913

Compton in 1927

None of these

There is no net transfer of energy by particle of medium in

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Longitudinal wave

Transverse wave

Progressive wave

Stationary wave

Magnetic effect of current is used:

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In electric motor

To detect current

To measure current

All of these

None of these

The linear momentum of the body is defined as

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p=ma

p=1/2ma

p=mv

p=1/2mv

An isochoric process is one which take place at

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Constant internal energy

Constant entropy

Constant volume

Constant pressure

Semi-conductor elements have atoms with

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2 valence electrons

3 valence electrons

4 valence electrons

5 valence electrons

When a shall explodes a mid-air, the total momentum of its fragments is

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less than the momentum of shell

equal to the momentum of shell

greater than the momentum of shell

none of them

Ethanol (alcohol) as a type of:

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Electric fuel

Bio fuel

Nuclear fuel

None of these

Transverse waves can be set up:

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Solids

Liquids

Gases

All of them

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

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maximum frequency

minimum frequency

threshold frequency

all of these

Compton was awarded Nobel prize in physics in

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1921

1923

1925

1927

At high altitude the blood oozes out of the nose and ear because

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The blood pressure increase at high altitudes

The percentage of oxygen in the air increase

The atmospheric pressure decrease there

The density of blood decrease at high altitudes

Zirconia is classified as:

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Ceramic solid

Ionic compound

Metal

Either (A) or (B)

Either (B) or (C)

Two water pipes of diameters 4 cm and 8 cm are connected with a supply line. The velocity of flow of water in the pipe 4 cm diameter is

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1/4 times

4 times

Twice

1/2 of 8 cm diameter pipe

If a 40 watt light bulb burns for 2 hours. how much heat is generated

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288 x 10³J

288 x 10⁸J

288 x 10⁵J

288 x 10⁶J

Intensity of light determines the:

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Energy of each photon

Number of photons

Speed of photons

Size of photons

None of these

Decibel is unit of

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Intensity of light

x-ray radiation capacity

sound loudness

Energy of radiation

In half wave rectification

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both halves of the input voltage is used

only one half of the input voltage is used

either of these

none of these

Crystal of germanium or silicon in its pure form at absolute zero acts as:

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A conductor

A semiconductor

an insulator

Both (A) and (C)

Both (A) and (B)

The strength of magnetic field around the current conductor is

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Smaller near the conductor

Greater near the conductor

Greater at the large distance from the conductor

Constant near and away from the conductor

The velocity of falling raindrops attains limited value because of

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Up thrust of air

Air currents of the earth atmosphere

Surface tension effect

Viscous force exerted by air

Blood pressure is measured by the instrument

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stethoscope

sphygmomanometer

barometer

none of them

For an atom having atomic number 'Z' and atomic weight 'A', the number of neutrons in the nucleous is

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A - Z

A

Z

A + Z

The total number of lines of magnetic induction pasing through a surface perpendicular to the magnetic field is called

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magnetic flux

magnetic flux density

magnetic induction

magnetic field intensity

The current produced by moving a loop of wire across a magnetic field is called

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Direct current

Magnetic current

Alternating current

Induced current

None of these

When an electron is accelerated through a P.D. of an one volt, it will acquire energy equal to

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One joule

One erg

One electron volt

None of these

The electric intensity outside the two oppositely charged parallel metal plates is

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Maximum

Minimum

Zero

Infinite

Resonance occurs when one of the natural frequencies of vibration of the forced or driven harmonic oscillator

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greater than the frequency of applied force

equal to the frequency of applied force

less than the frequency of applied force

all of them

A succession of events which bring the system back to its initial condition is called

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reversible process

irreversible process

a cycle

none of them

What is frequency of radio waves transmitted by a station, if the wavelength of those waves is 300 m?

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1 MHz

10 Hz

1 GHz

100000 Hz

The effect of friction between different layers of a flowing fluid is described in terms of

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motion of fluid

nature of fluid

colour of fluid

viscosity of fluid

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