Question # 1

Marie curie and Pierre curie discovered:

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Uranium

Polonium

Radium

Both (A) and (C)

Plutonium

When a silicon crystal is doped with a pentavalent element, such an extrinsic semi-conductor is called

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p-type semi-conductor

n-type semi-conductor

either of them

none of them

1 gm-cm^-3is equal to:

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10³kg-m^-3

10^-3kg-m^-3

1 kg-m^-3

10⁶kg-m^-1

At O° K which of the following properties of a gas will be zero?

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Kinetic energy

Potential energy

Vibrational energy

Density

F = I(L x B) is a

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vector

scalar

unit vector

none of these

A sinusoidally alternating voltage or current can be graphically represented by a:

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Vector

Rotating vector

Clockwise vector

Anticlockwise voltage vector

None of these

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

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1916

1919

1921

1923

The total energy of spring mass system is

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zero

changing with time

constant

none of them

The electric field, magnetic field and the direction of their propagation are mutually

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perpendicular

parallel

none of these

An emf is set up in a conductor when it:

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is kept in a magnetic field

is kept in a electric field

Move across a magnetic field

Both (A) and (B)

None of these

Work done along a closed path in a gravitational field is:

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Maximum

Minimum

Zero

Unity

Conversion of alternating current into direct current is called

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amplification

rectification

conduction

polarization

The energy of photon 'E' is proported to

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The magnetic field H

The electric field E

Both the electric and magnetic field H and E

Frequency

Which of the following is a state variable

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entropy

pressure

volume

all of them

Which of the following has the greatest coefficient of viscosity?

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water

gasoline

honey

tar

In the above figures, tell which set is graphs shows that a body is moving uniform velocity:

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(i) and (ii)

(ii) and (iii)

(i) and (iii)

(ii) and (iv)

If a liquid is heated in weightlessness, the heat is transmitted through

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Conduction

Convection

Radiation

Neither, because the liquid cannot be heated in weightlessness

A stone is dropped from rest from the top of a tower 19.6 m high. The distance traveled during the last second of its fall is (giving g=9.8 m/s^s)

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9.8 m

14.7 m

4.9 m

19.6 m

If the velocity of the body decreases non-uniformly then the slope of the velocity-time graph will have

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different values

same values

zero valves

constant valves

Acceleration of a body at any particular instant during its motion is known as

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average acceleration

uniform acceleration

instantaneous acceleration

all of them

The wave form of S.H.M will be

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square wave

sine wave

rectified wave

saw-tooth wave

Which of the following statements for an object in equilibrium is not true?

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The object must be at rest

The object can be at rest

The object is moving at constant speed

The acceleration of the object is zero

Work is a

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Scalar quantity

Vector quantity

Base quantity

None of these

SI unit of wave length is:

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Kilometer

Metre

Centimetre

Hertz

The ratio of velocity of sound in air at 4 atm pressure and that at 1 atm pressure would be

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1 : 2

4 : 1

1 : 4

2 : 1

If a car rest acceleration uniformly to a speed of 144 km/h in 20 s it covers a distance of

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20 m

400 m

1440 m

2880 m

In the study of thermodynamics, which gas is considered as the working substance

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real gas

ideal gas

any gas may be ideal or real

none of them

The magnitude of induced emf depends upon the:

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Rate of decrease of magnetic field

Rate of change of magnetic field

Rate of increase of magnetic flux

Constancy of magnetic field

None of these

In rotational motion, analogue of force F us called:

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Couple

Torque

Mass

Moment of intertia

The magnitude of alternative voltage V:

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Always increase

Always decrease

Remains constant

Does not remain constant

None of these

How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper:

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The upper half of the image is cut off

The brightness of the image is reduced

The brightness of the image is increased

No effect at all

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