Question # 1

In photoelectric effect the energy of ejected electrons depend on

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The frequency

The intensity

Both frequency and intensity

None of these

Spectrum represents the number of component colours present in certain light in terms of:

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Wavelength

Frequency

Energy

Both (A) and (B)

All of these

Energy required by an electron revolving in certain orbit to jump to an excited state is called:

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Ionization energy

Ionization potential

Excitation energy

Excitation potential

None of these

The information from far side of the universe are gathered by:

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Radio telescope

Microscope

Telescope

Spectro scope

The system international (SI) is built from _______ kind of unites

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Two

Three

Four

Five

The SI unit of magnetic induction is

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Gauses

Tesla

Weber

Weber²

Pressure of a gas at constant volume is proportion to

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Total energy of gas

Average P.E to molecules

Average K.E of molecules

Total internal energy of gas

The branch of physics which is mainly concerned with the motion of bodies under the action of forces is called:

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Optics

Mechanics

Thermodynamics

Astro physics

An LED emits light when it is:

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Forward biased

Reverse biased

Operated without battery

Operated with heat source

None of these

The string of a simple pendulum should be:

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Heavy

Extensible

In-extensible

None of these

Which of the following substances has got positive temperature coefficient of resistance?

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Carbon

Germanium

Silicon

Aluminium

None of these

The least distance of distinct vision changes with

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Time

Health

illness

Age

Blood is an incompressible fluid having density nearly equal to

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Milk

Honey

Water

None of these

In compound microscope magnification of objective is 2 and magnification of eyepiece is 4 magnification of compound microscope is

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2

6

8

None

An accurate measurement is the one which has

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Percertainity

Less percentage uncertainty

Less fractional uncertainty

b and c

If resultant of two forces (F and F) acting on a point is F,then the angle between two forces is.

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0°

45°

60°

120°

A magnetic field

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Always exerts a force on a charged particle

Never exerts a force on a charged particle

Exerts a force on a charged particle if it is moving across the magnetic lines of force

Exerts a force on a charged particle if it is moving along the magnetic lines of force.

A ball is dropped downwards After 1 second another ball is dropped downwards from the same point.What is the distance between them after 3 seconds?

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25 m

20 m

50 m

9.8 m

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

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Greater acceleration

Small acceleration

Same acceleration

None of these

Which one of the following can act approximately as a source of monochromatic light:

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Neon lamp

Fluorescent tube

Sodium lamp

None of these

The ratio of size of the image to the size of the object is called

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Resolving power

Magnification

Power

None of these

An ideal heat engine can only be 100% efficient if its exhaust temperature is equal to

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0°C

0k

100°C

Temperature of source

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