Question # 1

Which of the following is most suitable for the core of the electromagnetism

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Air

Steel

Su Ni allow

Soft iron

A person of height 1.5 m stands 2.0 m in front of a plane mirror How far from the person is her image .

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2.0 m

3.0 m

3.5 m

4.0 m

Two vectors of magnitudes 5 N and 7 N respectively are acting on a body if the angle between them is a right angle, their resultant vector will be.

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2 N

4 N

6 N

8 N

The power of lens in dioptres is

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Its focal length in meters

The reciprocal of its focal length in metres

The reciprocal of length in metres

The reciprocal of length in centimetres

The ratio of specific heat capacity to motor heat capacity of a body

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Is a universals cantante

Depends upon the mass of the body

Depends upon the molecular weight of the body

Is dimensionless

The doped semi conductor materials are called

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Pure semi conductors

Poor semi conductors

Super conductors

Extrinsic semiconductors

A standard fixed point for calibrating a thermometer is.

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Boiling point of water

Melting point of ice

Temperature of steam

Triple point of water

One weber is equal to.

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N A-1

N m-1 A

N mA-1

N m-1 A-1

Two waves which combine to produce a resultant by reinforcing each other of every point demonstrate.

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Destructive interference

constructive interference

Refraction

polarization

A direct vision spectroscope is better than a prism spectrometer because it helps in

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Observing the spectrum without a source

Observing the spectrum perpendicular to a source

Observing the spectrum in line with the source

all of the above

If T1 and T2 are source and sink temperature respectively Carnot efficiency is.

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T1+T2/T1

T1-T2/T1

T1+T2/T2

T1-T2/T2

A bi prism consists of.

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Two parallel glass plates

Two acute angled prisms

Two obtuse angled prisms

Two right angled prisms

If two non zero vectors are perpendicular to each other than their scalar product is equal to

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1

-1

0

infinity

Solids have

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Fixed shape only

Fixed volume only

Fixed shape and volume

No fixed shape and volume

A magnet is pushed horizontally towards a coil of insulated wire inducting an emf in the coilin which direction does the coil try to move.

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Downwards

Upwards

Away from the magnet

Towards the magnet

Which of the following factors determines the resolving power of an instrument.

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magnification

Total length of objective

Diameter of objective

Refractive index of objective

When two identical travelling waves are superposed, velocity of the resultant wave

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Remains unchanged

Decreases

Increases

Become zero

When an unbalanced external force acts on a body for a short interval of time.

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The body will experience an impulse.

The momentum of the body increases

The velocity of the body increase

The body is not effected

The SI unit of coefficient of viscosity of

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kg m s-1

kg m-1 s-1

kg ms -2

If air is replaced by any other dielectric medium, the force between two charges.

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Decreases

Increases

Remain the same

Becomes infinity

If the dot product of two non zero vectors vanishes the vectors will be.

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any scalar quantity

Any negative number

Its magnitude but not direction

Its magnitude and direction

Deuterium is

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A transuranic element

A type o cosmic particle

An isotope of hydrogen

An isotope of helium

A mason of 9.8 N weight is climbing on a 20 m high ladder The P.E. of mason at the middle of ladder is.

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98 J

196 J

960.4 J

980 J

Which of the following phenomenon is observed in obtaining an X ray photograph of our hand.

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Photoelectric effect

Zeeman effect

Shadow photography

Ionization

For which material magnetic susceptibility is negative.

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Paramagnetic

Diamagnetic

Ferromagnetic

All of these

Which one among these contacts in a transistor is non rectifying.

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Base

Emitter

Collector

None of these

Which of the following is a non conservative force.

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Gravitational force

Air resistance

Elastic force

Tension in a string

The amplitude of a vibrating body placed in a resistive medium.

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Increases exponentially with time

Decreases exponentially with time

Remains constant with time

Cannot be observed

A bus and a car moving with the same K.E. are acted upon by the same retarding force then the

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car will stop first

Bus will stop first

Both will stop simultaneously

Both will never stop

At what speed the mass of a body will be doubled.

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0.67 C

0.77 C

0.87 C

0.97 C

One volt is equal to.

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One joule per coulomb

One dyne per coulomb

One newton per coulomb

One watt second

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