Question # 1

Tick the correct pair when M denotes the molecular mass and other symbols carry usual meanings:

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N = nN_Am = MN_A

n = N N_A, M = mN_A

M = N_A/N , N_A= m/n

N = nN_A, M = mN_A

In the reverse process, the working substance passes through the same stages as in the direct process and

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thermal effects at each stage are exactly reversed

mechanical effects at each stage are exactly reversed

thermal and mechanical effects at each stage remain the same

thermal and mechanical effects at each stage are exactly reversed

A current carrying conductor sets up its own:

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Electric field

Nuclear field

Magnetic field

Both (A) and (C)

All of these

When thorium nucleus emits aβ-particle, the daughter nucleus is called:

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Protactinium

Actinium

Uranium

Radium

Redon

One complete round trip of the body about its mean position is called

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displacement

vibration

a complete motion

an acceleration

The graph showing the variation of displacement with time is a:

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Sine curve

Straight line

Parabola

None of these

Due to relative motion of observer and the frame of reference of events, time always:

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Dilates itself

Contracts itself

Stretches itself

Both (A) and (C)

None of these

An object undergoes SHM. Its maximum equilibrium positions:

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Maximum

Half of its maximum value

Zero

None

Ohm is the unit of

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current

capacitance

energy

resistance

The unit of thermodynamical scale is

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centigrade

fahrenheit

kelvin

none of them

Which one of the following is the unit of electric field intensity

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JC^-1

Vm^-1

Cm^-1

CJ^-1

Ball pen functions on the principle of

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Viscosity

Boyle's law

Gravitational force

Surface tension

Newtons laws are empirical laws, deduced from

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Theories

Experiments

Facts

None of these

The projectile is the motion which is

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One dimensional

Two dimensional

Three dimensional

None of these

Hard magnetic materials are

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Iron

Steel

Alnico

None of these

A body weights 100 N on the surface of the earth. Its weight at a depth equal to half the radius of the earth is

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44.44 N

50 N

25 N

75 N

Plane microwaves are incident on a long slit having a width of 5 cm.The wavelength of the microwaves if the first minima is formed at 30° is

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25 cm

5 cm

2.5 cm

5 mm

If focal length of objective is increased

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Magnifying power of compound microscope decreased

Magnifying power of astronomical telescope increases

The diameter of the objective lens

None of these

Inverse square law for luminace is valid for

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Search light

Isotropic point source

Cylindrical source

All types of source

Ordinary light has components of vibration in

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One direction

Different direction

All directions

None of these

The expression of energy stored in an inductor of length L and current I can be expressed by a relation

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1/2 LI²

1/2 I²L

1/2 I²L²

1/2 IL

The moment of linear momentum of a body is called

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Angular momentum

Couple

Impulse

Torque

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