Question # 1

An electron of the hydrogen atom in the second orbit is called its:

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Ground state

Excited state

Ionized state

Any of these

None of these

The wave motion set up in any medium depends upon:

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Elasticity

Inertia

Density

All of these

In case of mechanical waves, we study the motion of

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a single particle

collection of particle

any one of them

none of them

The torque per unit twist of coil is called

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proportionality constant

gravitational constant

boltzman constant

coupling constant

In compressional wave,the layer of medium having reduced pressure is called:

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Compression

Elasticity

Node

Rarefaction

Hertz is unit of:

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Time period

Displacement

Amplitude

Frequency

In the doping process, the ratio of the doping atoms to the semi conductor atom is

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1 to 10

1 to 10³

1 to 10⁶

1 to 10⁹

Resistance of a conductor is increased, the currant will

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Decrease

Increase

Remain the same

None of these

An important part of inkjet printer is:

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Toner

Drum

Deflection plates

Heated roles

None of these

'K' is the proportionality constant of force experienced by conductor. What is the value of 'K' in SI units?

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0

1

0.5

-1

In reverse-biased p-n junction, the reverse current is due to flow of:

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Minority charge carriers

Majority charge carriers

Free electrons from p to n-region

Holes from n to p-region

all are true except (B)

Work done is expanding gas under adiabatic condition results

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Increase in temperature

Decrease in temperature

No change in temperature

None of these

For a fixed force, larger is the mass of a body, the

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greater is its acceleration

smaller is its acceleration

smaller is its weight

zero is its acceleration

In thermodynamics, the change in internal energy depends upon:

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The path taken between initial and final states

The initial state only

The final state only

Initial and final states

A Gaussian surface is always an imaginary

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Open surface

Closed surface

Both

None of these

A ball tied to the end of a string is swing into a vertical loop then the tension will be maximum at the

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Highest point

Bottom point

Neither at top nor at bottom

None of these

The displacement coincides with the path of the motion when a body moves in a

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curved line

straight line

either straight or curved

none of them

Velocity time graph can also be used to determine

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Distance

Velocity

Acceleration

None of these

The turning effect of a force is called

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Acceleration

Torque

Velocity

Momentum

Einstein inferred that is gravitational acceleration and inertial acceleration are equivalent, gravity must

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Reflect light

Bend light

Turn light

None of these

The molecules or ions in a crystalline solid are

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static

not static

randomly moving

all of them

A particle of mass 'm' at rest is acted upon by a force 'P' for a time 't' its kinetic energy after an interval 't' is

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P²t²/m

P²t²/2m

P²t²/3m

Pt/2m

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