Question # 1

All the valence electrons present in a crystal of silicon are bound in their orbits by

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Ionic bond

covalent bond

Molecular bond

Both (A) and (B)

Both (B) and (C)

One complete round trip of the body about its mean position is called

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displacement

vibration

a complete motion

an acceleration

The phenomenon of generation of induced emf is called:

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Electrostatic induced

Magnetic induced

Electromagnetic induced

Electric induced

Both A and C

If the value of galvanometer constant k = C/BAN is made small, the galvanometer can be made

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Sensitive

Accurate

Stable

None of these

Work done in lower and bucket into the well is:

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Zero

Positive

Negative

None of these

Wave disturbances may also come in a concentrated bundle, like shock wave from an aeroplane flying at

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subsonic speed

sonic speed

super sonic speed

any one of them

If an iron ball and a wooden ball of the same radius was released from a height 'h' in vacuum, then time taken by both of them to reach ground will be

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Unequal

Exactly equal

Roughly equal

Zero

Electrons of an isolated atom are bound to the nucleus, and

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can only have distinct energy level

can only have same energy level

may or may not have distinct energy levels

none of these

If a system undergoes a natural process it will go in the direction that causes the entropy of the system plus the environment to increase, this is another statement of

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second law thermodynamics

first law of thermodynamics

third law of thermodynamics

none of them

If volume of wire is 'AL' and there are 'n' numbers of charge carriers per unit volume, then the total number of charge carriers are

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n/AL

Al/n

nAL

nA/L

Two electric bulbs of 200 W and 100 W have same voltage. If R₁and R₂be their resistance respectively then

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R₁= 2R₂

R₂= 2R₁

R₂=4R₁

R₁= 4R₂

The limit below which the Hooke s law holds well is called

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Yield point

Breaking stress

Tensile strength

Elastic limit

How many the multiplications of vectors are ?

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Three

Two

One

None of these

A thermodynamic process in which temperature of system does not change during heating

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Isobaric process

Isobar process

Isothermal process

Adiabatic process

Beta particles have penetration of about:

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100 times more than that of the gamma particles

100 times less than that of an alpha ray

100 times more than that of an alpha ray

10 times more than that of an alpha particle

When a sillicon crystal is doped with a pentavalent element, such an extrinsic semi-conductor is called

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p-type semi-conductor

n-type semi-conductor

either of them

none of them

The charges are attracted when

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Two charges are alike

Two charges are opposite

All of them

None of these

To find wavelength of light by his experiment. Newton utilized:

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Principle of phase change

Snell's Law

Bragg's law

Both (A) and (C)

Shear modulus for ice is

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1.2

2.5

3

3.3

If the power of a lens is 4 diopters then is focal length is

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20 cm

25 cm

50 cm

400 cm

Rectangular components of a vector are those which have angle between them

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30^o

60^o

90^o

0^o

To demonstrate the phenomenon of interference we require two sources that emit radiation

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Of same frequency

Different wavelength

Of the same frequency and having definite phase relationship

Of nearly the same frequency

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