Question # 1

As the light shines on the metal surface, the electrons are ejected

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slowly

instantaneously

either of these

none of these

Converse of pair production is known as

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Compton effect

annihilation of matter

photoelectric effect

none of these

Ammeter is used to measure

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voltage

resistance

voltage and current

current

An ordinary glass gradually softens into a 'paste -like' state before it becomes a very viscous liquid. It happens almost at:

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800^oC

500^oC

300^oC

100^oC

None of these

Satellites are held in orbits around Earth by its:

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Gravitational field

Magnetic field

Own orbital motion

Own spin motion

Which one of the following is an example of resonance

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swing

tuning a radio

microwave oven

all of them

From sand, we get a material used for construction of computer chips. That material is called:

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Germanium

Silicon

Copper

Lead

Above the curie temperature, iron becomes

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ferromagnetic

paramagnetic

diamagnetic

any one of them

The number of input terminals of an op-amp is:

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One

Two

Three

Four

None of these

Triple point of water is

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273.16°F

372.16K

273.16°F

273.16

The magnitude of chemical Effects depends upon:

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Nature of liquid

Quantity of Electricity passed through the liquid

Color of the liquid

Both (A) and (C)

Both (A) and (B)

Every crystalline solid has

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definite melting point

different melting points

may or may not be definite

none of them

Optic fibers are related with

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Communication

Light

Computer

None of these

If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity:

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Fringe width will decrease

Fringe width will increase

Fringe width will remain unchanged

Fringe will become less intense

A 2 kg body and a 2 kg body have equal momentum. if the kinetic energy of 3 kg body is 10 j. The K.E of 2 kg body will be

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6.66 j

15 j

22.5 j

45 j

The S.I. unit of angular displacement is

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Degrees

Revolution

Radian

All of them

Torque = Force x ?

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Speed

Momentum

Moment arm

Couple arm

__________ is a cubic pattern having one extra atom or molecule at the centre of each of the six faces of the cube

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Simple cube

Face centered cube

Body centered cube

None of these

Electric current is defined as:

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Flow of charges through conductor

Rate of flow of charges through conductor

Flow of electrons

Flow of protons

The distance between the two mirrors can be varied by

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Moving glass plate

Movable mirror

Compensator plate

None of these

If two non zero vectors A and B obey the relation |A + B| = |A - B|.then the angle between them is:

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120°

90°

60°

0°

A monochromatic source of light gives light of

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one colour

two colours

four colours

seven colours

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