Question # 1

Consider a photon of continuous X-ray and a photon of characteristics X-ray of same wavelength. Which of the following is/are different for the two photons

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Frequency

Penetrating power

Energy

Method of creation

A tube is tapered from 20 cm diameter to 2 cm diameter, the velocity at the first cross-section is 50 cm/s, then the velocity at the second cross-section is

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50 m/s

20 m/s

40 cm/s

5 cm/s

A particle executes SHM with frequency. The frequency with which its K.E oscillates is

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f/2

2f

f

4f

The SI unit of electric field intensity is

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CN^-1

NC^-1or Vm^-1

JC^-1

AV^-1

The practical application of the phenomenon of Mutual induction is

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Transformers

Generator

Motor

All of these

The restoring force always directed towards the

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extreme position

mean position

both of them

none of them

N s m^-2is unit of:

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Drag force

Pressure

Surface tension

Coefficient of viscosity

The velocity of sound at same temperature is maximum in

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H₂

N₂

O₂

NH₃

The ratio of shearing stress/shearing strain is called as

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Modulus

Pascal modulus

Hooker's modulus

Shear modulus

A field is uniform and much stronger:

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Inside a long solenoid

Outside a long solenoid

At the end of a long solenoid

At the central point of long solenoid

None of these

The critical temperature of tin is

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1.18 K

4.2 K

3.72 K

7.2 K

Salters duck is consists of

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Duck float

Body float

Balance float

a and c

Pick out the wrong pair:

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Charge-coulomb

Temperature-thermometer

Pressure-barometer

sp.gravity-hygrometer

Find the range of the projectile, having speed 30 ms^-1in a direction 30^o above the horizon

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50 m

80 m

90 m

100 m

The forbidden energy gap in semiconductors

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Lies just below the valence band

Lies just above the conduction band

Is the same as the valence band

Lies between the valence band and conduction band

When a silicon crystal is doped with trivalent impurity which are

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Indium

Arsenic

Phosphorous

None of these

The light source in the transmitter can be

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semiconductor laser

LED

both of them

either of them

Which of the following colors will have minimum critical angle when light passes from glass to air

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Red

Blue

yellow

Orange

The wavelength of X-rays is about

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10^-14m

10^-10m

10^-6m

10^-4m

A positively charged particle is moving perpendicular to a uniform magnetic field. The magnetic force makes the particle to move along:

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An elliptical path

A circular path

A parabolic path

None of these

When two objects come to common temperature, the body is said to be in:

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Static equilibrium

Dynamic equilibrium

Thermal equilibrium

None of these

The rotational analogue of power is given by

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τω

τv

F ω

τ/ω

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