Question # 1

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 photoelectric effect, the maximum energy of photoelectrons depends on the

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particular metal surface

frequency of incident light

both of them

none of them

A person standing near the track of a fast moving train has tendency to fall towards it because of

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Vibration due to motion of train

Gravitation force of attraction between person and trains

The high speed of train

Some other effect

In the region surrounding a current carrying wire:

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A magnetic field is setup

The lines of force are elliptical

Direction of lines of forces depends upon direction of current

Both (A) and (C)

All of these

Which of the following is most suitable as the core of transformer

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Soft iron

Alinco

Steel

None of these

The phase angle of a series RLC circuit at resonance is

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180°

90°

0°

None of the these

When platinum wire is heated, then at the temperature of 500 ^oC, it becomes:

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Yellow

Orange red

Dull red

White

Cherry red

The electric field lines start from

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Positive charge

Negative charge

Either A or B

Neutron

An atom

The square of 0.4 is:

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Greater than 0.4

Smaller than 0.4

Equal to 0.4

None of them

In rotational motion, analogue of force F us called:

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Couple

Torque

Mass

Moment of intertia

Watt x second is unit of:

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Force

Work

Power

None of these

When the fuel ignited it turns to a gas at

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Low pressure

High pressure

Extremely high pressure

None of these

Wavelength of light, on the average, is given by

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10^-14m

10^-10m

10^-6m

10^-4m

According to Huygen's principle, every point of a wavefront may be considered as a source of

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primary wavelets

secondary wavelets

either of them

both of them

The momentum of a body is p and its kinetic energy is E its momentum become 2p its kinetic energy will be

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E/2

3E

2E

4E

Half-life of radon gas is:

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1620 years

3.8 days

7 days

11 days

To get three images of a single object,one should have two plane mirrors at an angle of

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90°

120°

30°

160°

As we go above the surface of earth the value of 'g'

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Increase

Remain Constant

Decrease

Increase slightly

Which phenomenon of light takes place in Young's double-slit experiment?

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polarization of light

diffraction of light

interference of light

reflection of light

The speed of running cheetah is

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15 ms^-1

23 ms^-1

26 ms^-1

29 ms^-1

Such substance which break soon after crossing the elastic limit is called

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Weak substance

Ductile substance

Brittle substance

Organic substance

The moment of inertia of a body does not depend upon its

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Angular velocity

Mass

Distribution of mass

Axis of rotation

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