Question # 1

The best conductor is:

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Silver

Copper

Aluminimum

Both B and C

None of them

During the projectile motion, the horizontal component of velocity

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changes with time

remains constant

becomes zero

decreases with time

The third band of the colour code:

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Gives the number of zeroes

Is decimal multiplier

Gives the resistance tolerance

Gives the third digit

Both (A) and (B)

In which of the following components, pn-junction is used

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light emitting diode

photo diode

photo voltaic cell

all of these

The missing mass which is converted to energy in the formation of nucleus, is called

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packing fraction

mass defect

binding energy

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

One mole of any substance contain

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same number of molecules

different number of molecules

may be same or different

none of them

Conversion of alternating current into direct current is called

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amplification

rectification

conduction

polarization

When low energy photon interact with a metal,which of the following effect is likely to be taken place

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pair production

photoelectric

Compton effect

None of these

An induced current can be produced by:

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Constant magnetic field

Changing magnetic field

Varying magnetic field

Constant electric field

None of these

.Depletion region contains:

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Protons

Positive ions

Negative ions

Both (B) and (C)

Both (A) and (C)

The quantity of motion of the body is called

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Force

Acceleration

Momentum

None of these

A chiminey works best when it is

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Tall

Exposed to air currents

Not tall but wide

a and b

In YDS experiment, if the distance between the slits and also the distance between slits and screen is doubled, the fringe width:

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Becomes doubled

Becomes 4 times

Is halved

Remains the same

The curie temperature of iron is

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600 C^o

650 C^o

700 C^o

750 C^o

__________ is a cubic pattern having one extra atom or molecule at the centre of each of the six faces of the cube

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Simple cube

Face centered cube

Body centered cube

None of these

Steel is preferred for making permanent magnets because it has

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Large retentivity and large coercively

Small retentively and small coercively

Large retentively and small soercively

Small retentively and large coactivity

A projectile on its path gets divided into two pieces at its highest point.Which is true?

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Momentum increases

Momentum decreases

Kinetic energy increases

Kinetic energy decreases

The diameter of the milky way is

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10¹⁵ m

10¹⁷ m

10¹⁸ m

10²⁰ m

The efficiency of a particle heat engine:

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can be 100%

Cannot be 100%

Is always zero

None of these

Which of the following is the relation of centripetal force?

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mv²/r

mv/r

mv³/r

mv³/r³

Moment of inertia of a solid disc or cylinder is

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mr²

1/2 mr²

1/3 mr²

1/4 mr²

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