Question # 1

The 'x' in X-rays means

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Xenon

Explosion

x for unknown

X makes the spot

Light wave are

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Longitudinal

Transverse

Sometimes longitudinal and sometimes transverse

Neither longitudinal nor transverse

The energy following per second through a unit area held perpendicular to the direction of wave is.

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The loudness of the sound waves

The pitch of the sound waves

The intensity level of sound waves

The intensity of sound waves

The specific heat of an ideal gas values as

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To

T1

T2

T3

Who introduced the concept that an atom possesses quantized energy levels.

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Fermi

Newton

Bohr

Einstein

Which six particles and their antiparticles interact by the weak interaction.

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Leptons

Hadrons

Muons

pi mesons

If a body of mass 'm' was released in a vacuum just above the surface of a planet of mass M and radius R what will be the gravitational acceleration.

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GmM/R

GM/R²

GM/R

GM/2R

Mutual inductance has a practical role in the performance of the

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Radiochoke

Transformer

Generator

Trnasistor

Wave theory of light was proposed by

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Newton

Thomas Young

Maxwell

Huygen

If Young's experiment is performed in water. which of the following change will occur.

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Fringe width will increases

Fringe width will decreases

Fringe width will remain unchanged

No fringe will be seen

The mass defect of Bohr's atomic model is

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Exclusion of nuclear motion

missing of classical and quantum theories

Failed to explain the fine structure of spectral line

All of the above

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

What would be the magnitude and direction of acceleration which would made the spring balance reading zero.

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Zero

1 m s-2 upward

9.8 m s-2 upward

9.8 m s-2 downward

A transistor can be used as

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Oscillator

Amplifier

Switch

Both a and c

Two electrons approach each other their relative velocity will be.

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Zero

c

c/2

Infinity

The shape of wave front depends on

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Density of medium

Shape of medium

Viscosity of medium

Length of medium

When a light ray enters from air into water then its wavelength.

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Increases

Decreases

Become infinity

Remains constant

A transformer is used to.

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Convert D.C. into A.C.

Convert A.C. in to D.C.

Obtain A.C. voltage

Enhance the power

Eddy current can be minimized by

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Moving the conductor rapidly

Moving the conductor slowly

Using a metallic core

Using a laminated core

The ration Cv/Cp = y for a diatomic gas like air is

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1.29

1.30

1.40

1.67

Eye colour is the colour of

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Iris

Retina

Comea

Pupil

Where should be the centre of gravity of a body.

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It must be within the body

It must be outside the body

It may be near but not essentially within the body

It changes its position after sometime

If the vector sum of all the torques is zero then

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1st condition is satisfied

2nd condition is satisfied

Centre of mass is lowered

Gravity becomes zero

The SI unit of current gain is.

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Ampere

Ampere metre

Ampere volt

It has no unit

A freshly made sample of radioactive material gives a count rate of 8,000 counts per minute After twenty days it gives a count rate of 500 counts per minute What is the half life of the materials.

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5 days

10 days

40 days

20 days

What is the human body temperature in Celsius scale.

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30 oc

36. 9 oC

98. 4 oC

100 oC

Plasma exists in

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Electric bulbs

Tube light

Energy savers

Fluorescent tubes

A bodybuilders uses a chest expander with five springs it takes a force of 20 N to Pallone spring out by 15 cm how much force will be needed to extend the expander by 15 cm.

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50 N

75 N

150 N

1000 N

Which of the following statemtents is worng.

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Charge is quantized

Charge is conserved

There is not field near an isolated charge at rest

A moving charge produces both electric and magnetic field.

A perfect gas is one whose

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Molecules are masless

Molecules are energetic

Molecules are perfectly elastic

Molecules are at rest

In scattering experiment which force scatters alpha particle.

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Nuclear force

Coulomb's force

Gravitational force

Centripetal force

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