Question # 1

Which of the following medium can transmit both transverse and longitudinal waves.

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Solid

Gas

Liquid

Plasma

Liquids with disordered structure frozen in are an example of

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Amorphous solids

Glassy solids

Crystalline solids

Polymeric molecules

A solid state detector is basically

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A reverse biased p-n junction

A forward biased p-n junction

A p-n -p transistor

A n-p-n transistor

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

Which of the following is not a mode of radioactive decay.

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Positron emission

Electron capture

Fusion reaction

A decay

What makes the air coming out of a punctured tyre cool.

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Isothermal expansion

Adiabatic expension

Flow at high speed

Atmospheric pressure

The scalar product of two vectors in negative when

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Vectors are parallel

Vectors are antiparallel

Vectors and perpendicular

Vectors are parallel with same magnitude

In free expansion of a gas. the internal energy of the system.

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Increases

Descreases

Remain unchanged

Becomes infinite

A junction between P-Type and n-type materials is called.

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Ampilifier

Transistor

Rectifier

Diode

Which technique uses underwater sound propagation to detect and locate submerged objects.

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RADAR

LIDAR

SONAR

LASER

The value of mutual inductance can be increased by

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Decreasing number of turns in the coil

Increasing number of turns in the coil

Winding the coil on china clay

Winding the coil on wooden frame

The amplitude of sound wave determines its

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Pitch

Loudness

Reverberation

Interference

if temperature eon Celsius scale is 50 oC the temperature on Fahrenheit scale will be.

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102 ^oF

108 ^oF

112 ^oF

122 ^oF

The diver spins faster when moment of inertia becomes

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Smaller

Greater

Double

zero

Thermodynamics deals with

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Isolated systems

The interactions among various parts of the system

The microscopic behavior of a system

The interactions between system and surrounding

Which one of the following solids exhibits only shot range order.

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Amorphous solids

Polymeric solids

Crystalline solids

Metals

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

Young's double slit experiment was performed in

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1801

1916

1901

1934

If the pressure in a closed vessel is reduced by drawing some gas the mean free path of the gas molecules.

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Decreases

Remains constant

Increases

First increases then decreases

The SI unit of radioactivity is.

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Becquerl

Curie

Joule

rutherford

The maximum stress a solid material can sustain with out undergoing permanent deformation is called.

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elastic limit

Plastic

elastic deformation

Plastic deformation

A magnetic field is said to exist at a point if

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A force is exerted on a charge placed at that point

A magnetic pole exists at that point

An ampersand current loop surrounds the point

A force not felt by a static charge acts on a moving charge placed at that point

Charge to mass ration of an electron is determined by using the relation.

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e/m = B/rv

e/m = r/vB

e/m = V/Br

e/m = v/r

Which of the following describes that the time interval between two events may be different in different of references

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Simullaneously

Time dilation

Length contraction

Mass variation

Thermodynamics concern its primary with the

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Measurement of quantity of heat

Physical effects of temperature changes

Conversion of heat into other energy forms

Behavior of gases

A semiconductor diode conducts only when it is

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Not biased

Zero biased

Reverse biased

Forward and biased

In the experiment of production of X rays electrons are accelerated towards the anode by

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Thermionic emission

Potential difference

Breaking potential

Cut of current

Mean free path of gas molecules in inversely proportional to its.

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Weight

Temperature

Pressure

Volume

Slip Rings are used in

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D.C. dynamo

A.C. dynamo

Transformers

Battries

In an induction coil, the secondary emf is.

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Zero at the break of the circuit

Zero during make of the circuit

Very high during make of the circuit.

Very high during break of the circuit

Which are different types of emission spectrum

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Continues spectrum

Line spectrum

Band spectrum

all of the above

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