Question # 1

A semi-conductor in its extremely pure form is known as

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extrinsic semi-conductor

intrinsic semi-conductor

either of them

none of them

If the distance between the plates of a parallel plate condenser of capacity 10μF is doubled then new capacity will be

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5μF

20μF

10μF

15μF

When a body is vibrating, the displacement from mean position

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Increases with time

Decreases with time

Changes with time

None of these

γ-rays behave like a particle because they explain the

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Compton effect

Photoelectric effect

Pair-production

all the above

Internal energy is the sum of all the forms of

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K.E

P.E

both of them

none of them

The electric field lines start from

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Positive charge

Negative charge

Either A or B

Neutron

An atom

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

Decibel is unit of

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Intensity of light

x-ray radiation capacity

sound loudness

Energy of radiation

When a mass 'm' is pulled slowly through a distance 'x_o' , the elastic potential energy of the spring would be

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P.E=Kx²_o

P.E= 1/2kx_o

P.E=1/2Kx²_o

P.E=Kx²_o

The spectrum emitted from hydrogen filled discharge tube is:

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Line spectrum

Discrete spectrum

And spectrum

Absorption spectrum

Both (A) and (B)

By placing a dielectric in between the charges, the electrostatic force between them

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Is always reduced

Is always increased

Is not affected

Is increased one million times

None of these

Newton's first law of motion is also known as

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Law of motion

Law of mechanics

law of inertia

None of these

What is the main cause of the shinning of diamond?

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Reflection

Refraction

Total internal reflection

Dispersion of light

The force which maintains the strict long-range order between atoms of a crystalline solid is the:

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Nuclear force

Cohesive force

Adhesive force

Coulomb force

None of these

The waste material of the process in a digester is a good

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Inorganic fertilizer

Organic fertilizer

Waste disposal

b and c

Capacitor is a device use to store the

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A.C. current

D.C. current

Charge

Voltage

One angstrom equal:

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10^-8m

10^-9m

10^-10m

10^-11m

Debye is the unit of

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Magnetic dipole moment

Electric dipole moment

Density

RMS velocity

Energy stored in the spring of watch is called

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Gravitational P.E.

Potential energy

Elastic potential energy

None of these

The second condition for equilibrium describes that

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ΣFx = 0

ΣF_y = 0

ΣF = 0

Στ = 0

The component of a vector has its direction as

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Same

Opposite

perpendicular

None of these

The magnification is negative for

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Real image

Virtual image

Sometimes for real sometimes for real

Only for cancave lens

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