Question # 1

A physical system under going forced vibrations is known as

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Simple harmonic oscillator

Compound harmonic oscillator

Physical harmonic oscillator

driven harmonic oscillator

Work-energy principle states that work done on the body by applied force is equal to change in:

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Potential energy

Kinetic nergy

Linear momentum

None of these

If m is the mass of the gases ejected per second with velocity v relative to the rocket of mass M, then the acceleration of rocket is

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a = M/mv

a = mM/v

a = mv/M

a = v/mm

When quarter of a circle is completed, phase of vibration is:

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90°

180°

45°

360°

If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be

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Equal to 1

Less than 1

Greater than 1

Infinity

Whenever a covalent bond breaks, it creates:

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An electron

A hole

An electron-hole pair

A positron

All of these

Particles have the mass smallest of following is

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Electron

Proton

Neutron

Quark

For a n-p-n transistor, the conventional current equation can be written as

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I_E+ I_C= I_B

I_C- I_B= I_E

I_C+ I_B= I_E

I_B+ I_E= I_C

Number of supplementary units are

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Three

Two

Seven

Five

Crystal of germanium or silicon in its pure form at absolute zero acts as:

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A conductor

A semiconductor

an insulator

Both (A) and (C)

Both (A) and (B)

According to the special theory of relativity, time is

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absolute quantity

not absolute quantity

constant quantity

none of these

At what point/points in its path does a projectile have it minimum speed ?

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At the point of projection

At maximum height

All the point where it strikes the ground

None of these

Two bodies with kinetic energies in the ratio 4 : 1 are moving with equal linear momentum.The ratio of their masses is

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1 : 2

1 : 1

4 : 1

1 : 4

The body is in equilibrium when it is in a state of

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Accelerated motion

Uniform motion

Rest or uniform motion

None of these

In Young's double slit experiment, the fringe width depends on

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wavelength of the light used

distance between the slits and screen

distance between the slits

all of them

Dimensions of light year are

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[LT^-1]

[ML^-1T]

[ML^-1]

[M⁰L]

The conduction of electrons takes place and conduct electric current through solids is a

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Energy band

Conduction band

Valence band

Completely filled band

In an inertial frame of reference the weight of body equal to

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Force of attraction

Coulomb's force

Force of gravity

All of these

A pure semiconductor has:

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An infinite resistance at 0^oC)

A finite resistance which does not depend upon temperature

A finite resistance which decreases with temperature

A finite resistance which increase with temperature

Which will be more effective in knocking a bear down

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A rubber bullet

Lead bullet of same momentum

A wood bullet

None of these

The ideal gas obey gas law at:

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Low tempratures and high pressures

High temperatures and low pressures

All temperatures and pressures

None of these

The magnitude of potential barrier for Ge is

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0.7 v

0.3 V

7v

3 v

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