Question # 1

The distance travelled byα-particle in a medium before coming to rest, is called

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range ofγ-particle

range of neutrons

range of particle

none of these

Substances which break just after the elastic limit is reached, are known as

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brittle substances

ductile substances

plastic substances

elastic substances

A current of 1 ampere is passing through a conductor. The charge passing through it in half a minute s

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One coulomb

0.5 coulomb

30 coulombs

2 coulombs

None of these

Fluids have three types of energies. The Bernoulli's equation combines those energies.which of the following is one of the three enrgies possessed by a fluid?

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potential energy

pressure energy

strain energy

(a) and (b) only

Photoelectric effect takes place with a photon of:

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Very high energy

Very low energy

Low energy

High energy

None of these

A ball falls on the surface from 10 m height and rebounds to 2.5 m. if the duration of contact with the floor is 0.01 seconds then the average acceleration during contact is

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2100 m/s²

1400 m/s²

700 m/s²

400 m/s²

If two waves of length 50 cm and 51 cm produced 12 beats per second, the velocity of sound is

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360 m/s

306 m/s

331 m/s

340 ms

A potential barrier of 0.7V exists across p-n junction made from:

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Germanium

Silicon

Arsenic

Gallium

Indium

Heating effect caused by an electric circuit is written

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H = I²Rt

H = I²R

H = IR²t

H = IR²

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 SI unit of flux density is.

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Tesla

Weber

Gaun

Weber/meter

If a body reaches a speed equal to the speed of light, then its mass will became

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zero

very small

infinity

none of these

During the negative half-cycle of the half-wave rectification, the diode

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does not conduct

conducts

either of these

none of these

When a wave is travels from one place to another, it transfers:

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Matter

Energy

Momentum

Both B and C

Average KE of a gas molecule has:

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Direct relation with absolute temperature and inverse relation with pressure

Direction relation with both absolute temperature and pressure

Inverse relation with both absolute temperature and pressure

None of these

The velocity of falling raindrop attains limited value because of

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Up trust of air

Viscous force exerted by air

Surface tension effect

Air currents atmosphere

When a constant potential difference is applied across the conductor, the drift velocity of electrons:

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Increases

Decreases

Remains the constant

Either of these

None of these

The product of the pressure and volume of an ideal gas is

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A constant

Approximately equal to the universal gas constant

Directly proportional to its temperature

Inversely proportional to its temperature

The relation between the charge Q of a parallel plate capacitor and the P.D between its plates is

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Q=V/C

Q=C/V

Q=1/2CV

Q=CV

Truth of kinetic energy is confirmed by:

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Diffusion of gases

Brownian motion

Both A and B

None of these

Electrons are

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positive charged

negatively charged

massless

neutral

If the distance between two charges is doubled, the force between them will become:

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Double

Half

Three times

One fourth

One third

In the equilibrium state, the potential difference between two ends of the conductor moving across a magnetic field is called:

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Motion emf

Electrostatic emf

Induced emf

Both A and B

Both A and C

The Boltzman constant has the value

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1.38 x 10^-23JK^-1

1.28 x 10^-23JK^-1

1.38 x 10^-26JK^-1

1.28 x 10^-26JK^-1

Ultra-violet rays differ from X-rays in that they

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Cannot be diffracted

Cannot be polarized

Have a lower frequency

Are deviated when they pass through a magnetic field

The powers of tow electric bulbs are 100 W and 200 W. Both of them are joined with 220 V mains. The ratio of resistances of their filaments will be

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1 : 2

2 : 1

1 : 4

4 : 1

Surface tension of water is reduced by adding

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Detergents

Camphor

Plastic

Both A and B

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

A thermistor is a resistor which is:

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Light Sensitive

Heat Sensitive

Sound Sensitive

All of these

None of these

Two sources of sound are said to be coherent if

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The produce sounds of equal intensity

They produce sounds of equal frequency

They produce sound waves vibrating with the same phase

They produce sound waves with zero or constant phase difference all instant of time

When the waveform of one voltage is increasing and that of second is decreasing and vice versa, then phase difference between these voltage is

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90°

75°

0°

180°

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