Question # 1

For the working of a heat engine, there must be

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a source of heat at high temperature

a sink at low temperature

both of them

none of them

Which type of wave can be set up in solids

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longitudinal waves

transverse waves

both of them

none of them

The commercial unit of electrical energy is :

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K Watt

KWH

Horse power

Joule

At high altitude the blood oozes out of the nose and ear because

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The blood pressure increase at high altitudes

The percentage of oxygen in the air increase

The atmospheric pressure decrease there

The density of blood decrease at high altitudes

Two point charges A and B separated by a distance R attract each other with a force of 12 x 10^-3N. The force between A and B when the charges on them are doubled and distance is halved

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1.92 N

19.2 N

12 N

0.192 N

The body passing a viscous medium affected by:

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One force only

Two forces only

Four forces

None of these

Electric flux is:

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Cross product of two vector

Dot product of two vectors

A vector quantity

A scalar quantity

Both (B) and (D)

The ultimate source of money sources of energy is:

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Sun

Air

Water

Petroleum

A lift is moving up with acceleration equal to 1/5 of that due to gravity. The apparent weight of a 60 kg man standing in lift is

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60 kg wt

72 kg wt

48 kg wt

Zero

The work performed on an object does not depend on:

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Force applied

Angle at which force is inclined to the displacement

Initial velocity of the object

Displacement

Silicon can be obtained from

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Lead

Uranium

An isotope of oxygen

Sand

The internal energy of a gram mole of an ideal gas depends upon

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Pressure alone

Volume alone

Temperature alone

Both pressure and temperature

In photoelectric effect, electrons are emitted with:

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Same energy

Different energies

Both (a) & (b)

Intermittent energies

For an adiabatic expansion of a gas which of the following statement is false?

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Pressure of gas decreases

No heat is supplied to the gas

Work is done by gas

Entropy of gas is increased

A long solenoid has 20 turns/ cm. The current necessary to produce a magnetic field of 20 mellites inside the solenoid is approximately:

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1A

2A

4A

8A

In Bernoulli's equation, the work done due to fluid is

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The magnitude of the displacement is a line from initial position to final position which is

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straight

curved

either straight or curved

none of them

The magnetic field due to the electric current in a conducting wire is:

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Towards the centre of the conducting wire

Circular around the conducting wire

In the direction of the electric current

In the direction opposite to the electric current

The dimension of elastic modulus

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ML^-1T²

MLT²

ML^-1T²

MLT³

A person moves 30m north then 20m east then 30√2 m south west His displacement from the original position is

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14 m south west

28 m south

10 m west

15 m east

A proton is about 1840 times heavier than an electron When it is accelerated by a potential difference of 1 kV,its kinetic energy will be:

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1840 keV

1/1840 keV

1 keV

920 keV

Three quarks make up a:

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Leptons

Mesons

Baryons

Quark

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