Online Test

Question # 1

Current is measured in

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volts

watt

ohm

ampere

When the temperature of source and sink of heat engine become equal than efficiency of heat engine will

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Maximum

Minimum

Negative

Zero

The escape velocity of Saturn in Kms^-1

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30.0

35.04

37.0

37.4

The bridge circuit of full wave rectification uses

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one diode

two diodes

three diodes

four diodes

The special theory of relativity is bases d on:

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Four postulates

Three postulates

Two postulates

One postulate

None of these

The gamma camera is designed to detect

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α-radiation

β-radiation

γ-radiation

X-rays

Nuclear forces are

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Short range forces

Long range forces

Independent of distances

None of these

The wave propagates in space by the motion of the

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Particles

Wavefronts

Wavelength

None of these

As the temperature of a hot body rises, the proportion of:

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Shorter wavelength radiation increases

Longer wavelength radiation decreases

Both (A) and (B)

Longer wavelength radiation increases

Both (A) and (C)

The energy of the γ-rays more than 1.02 MeV the dominant process is

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Compton effect

Pair production

Photo electric effect

None of these

Since density is proportional to the pressure, so the speed of sound by the variation in the pressure of the gas is

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Affected

Not affected

Slightly affected

None of these

Duringγ-decay

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A changes by 4 while Z changes by 2

A remains constant while Z changing by +1

A and Z both change by 2

A and Z both remain unchanged

Theγ-rays radiography are used in

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Internal imaging of the brain

Size and location of tumor

Cavities in easting for pipes

All of them

High or 1 can be any voltage between:

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0 to 0.8 V

1.5 to 2.0 V

3.5 to 5 V

2 to 5 V

The acceleration of a body executing SHM at its mean position is

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Minimum

Maximum

Zero

None of these

A body is dropped from a tower reaches the earth surface in 4 sec where g is 10 m/s²the height of tower is

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80 m

20 m

160 m

40 m

The effect of loading the prongs of a tuning fork with wax is to:

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Increase the frequency

Decrease the frequency

Maintain the original frequency

All of these

The relation for the stationary waves in a stretched string is where n = 1, 2, ,3, ....

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The electric and magnetic forces were unified to get an electromagnetic force by

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Faraday

Maxwell

Ampere

A and B

Dimensions of power are

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ML²T^-3

ML²T^-2

ML²T^-1

MLT^-2

One mole of (NH₄)₂HOP_{4 contains _ moles of hydrogen atoms:}

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1

5

6

9

The medium in which speed of light is the same in all directions is called:

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Homogeneous

Heterogeneous

Non-homogeneous

Free space

Speed of light in vacuum depends upon:

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Frequency

Wavelength

Amplitude

None of above

Newtons second law of motion is also called

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Law of inertia

Law of acceleration

Law of force

None of these

Computerized axial tomography is

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BAT-scanner

CAT-scanner

RAT-scanner

None of these

The work done in an adiabatic change in a particular gas depends upon only

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Change in volume

Change in temperature

Change in pressure

Change in specific heat

The apparent size of an object depends on the angle subtended but it at the eye. As the angle increases the size of the object

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Smaller

Larger

Very large

None of these

When X-rays pass through air they

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Produce light track in the air

Ionize the gas

Produce fumes in air

Accelerate gas atoms

The 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 diffraction grating of length 2cm has 4000 lines The grating element is

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0.5 x 10^-2 cm

5 x 10⁴

5 x 10^-4

0.5 x 10^-4 cm

Average radiation doses from nuclear power stations for a year is

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10 m Sv

20 m Sv

30 m Sv

4 m Sv

A solenoid is a cylindrical, long and tightly wound coil of wire. When a current pass through it behaves like a

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Source of emf

Magnet

Electromagnet

None of these

Bohr's atomic model gained acceptance above all other models because it:

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Is based on quantum hypothesis

Explained the constitution of atom

Assumed continuous radiation of energy by orbiting electrons

Explained hydrogen spectrum

Ultrasonic waves are particularly useful for

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Object detection in air

Object detection in water

Both

None of these

The horizontal velocity component in projectile motion is

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Zero

Constant

Maximum

None of these

Stationary waves only of discrete set of frequencies are set up in a medium this fact is called

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Harmonics

Overtones

Quantization of frequencies

Superposition of frequencies

A nucleus emit γ radiation then

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Z increases

A increases

Both A and Z increases

Both remain same

Fringe spacing in YDS experiment will be maximum if we use:

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Red light

Green light

Violet light

Blue light

A cannot engine takes 300 calories of heat at 500 k and rejects 150 calories of heat to the sink.The temperature of sink is

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125 k

250 k

750 k

1000 k

The displacement time graph for the two particles A and B are straight lines inclined at 60° and 30° with the same axis.The ratio of the velocity of B is

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1:1

2:1

3:1

4:1

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