Question # 1

Heat radiation obey the laws of:

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Absorption

Reflection

Both A and B

None

Evaporation causes:

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Melting

Boiling

Freezing

Cooling

Latent heat of fusion is denoted by:

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H1

Hm

Hv

Hf

Stress is defined as

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Stress = Force/ Area

Stress = Area/Force

Stress = Area/ Volume

Stress = Mass/ Volume

Centripetal acceleration of a body is given by formula:

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a_c=v/r

a_c=mv²/r

a_c=v/r²

a_c=v2/r

If a body does work at the rate of 1 Js^-1then its power will be:

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KW

1 MW

1 W

None of these

A line about which a body rotates is called;

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Axis of rotation

Rigid Body

Center of gracity

None of these

The least count of screw gauge is.

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.01 mm

0.1 mm

.001 mm

.01 m

The orbital speed of a low orbit satellite is

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Zero

8 ms-1

800 ms-1

8000 ms-1

Coloured surface is a

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Best emitter

Good emitter

Bad emitter

Wrost emitter

Good conductor is :

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Air

Wood

Iron

None

From which of the following you can get information almost about everything?

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Book

Teacher

Computer

Internet

The ratio of external force applied on the spring to displacement is called:

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Hook's law

Constant

Spring constant

Capacitors are used to store:

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Current

Voltage

Charge

Resistance

The process by which electrons are emitted by a hot metal surface is known as:

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Boiling

Evaporation

Conduction

Thermionic emission

The way of doing business by using web is called:

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Sources of entertainment

Web business

E-commerce

E-mail

Big unit of capacitance is:

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Farad

Volt

watt

coulomb

SI unit of capacitance is:

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Joule

Volt

Watt

Farad

The speed of waves can be calculated by:

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Vt

d x t

f λ

Tf

The mirror whose outer surface is reflecting is called:

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Concave mirror

Convex mirror

Lens

Mirror

1 volt is equal to:

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JC

JC^-1

JC^-2

JC^-3

The oscillations of a system in the presence of _____________ force are called amp oscillations:

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Resistive force

Attractive force

Both of these

None of these

A pentaralent impurity in Si

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a free electron and a free hole

a free hole

a free electron

No free particle

The bnding energy for nucleus A is 7.7 Me V and that for nucleus B is 7.8 MeV. Which nucleus has the larger mass?

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Nucleas A

Nucleus B

Less than nucleus

None of these

The material whose resistivity becomes zero below a certain temperature

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Conductors

Semi conductors

Super conductors

Insulators

Step up transformer is used.

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Step up D.C. voltage

Step up A.C. voltage

Step up both A.C and D.C.

Step up A.C. current

Magnetic induction can be measured in units of.

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Tesla

Gauss

Weber/m2

All of the above

The phase difference between the current and voltage at resonce is:

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0

π

-π

π/2

A current carrying conductor experience maximum magnetic force in a uniform magnetic field when it is placed.

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Perpendicular to field

Parallel to field

At an angle of 60 ^o to the field

None of these

Conductors have conductivities of order:

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10³(Ωm)-1

10⁷(Ωm)^-1

10⁷Ωm^-1

10^-6Ω

If force in the direction of velocity of conductor, then induced current is directed,

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Anti clockwise

Clock wise

At equilibrium

None of above

The slope of q-t curve at any instant of time gives.

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Voltage

Current

Charge

Botha a and b

A wire stretched to double of its length, its strain is:

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2

1

0

0.5

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