Question # 1

In the phenomenon of hysteresis

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magnetism leads the magnetising current

magnetism lags behind the magnetising current

meganetism goes along the magnetising current

none of them

When a bicycle is in motion but not pedaled, the force of friction exerted by the ground on the two wheels is such that it acts

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In the backward direction on the front wheel and in the forward direction on the rear wheel

In the forwards directions on the front wheel and in the backward direction on the rear wheel

In the forward direction on both the wheels

In the backward direction on both the wheels

A meter wire carraying a current of 2A is at right angle to the uniform magnetic field of 0.5 Weber/m²The force on the wire is

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5N

4N

1.5N

6N

X-rays produced in a tube operating at 10⁵V. The speed of X-rays produced is

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3 x 10⁸m/s

3.1 x 10⁸m/s

2.8 x 10⁸m/s

1.88 x 10⁸m/s

Gas constant per molecule is called:

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Universal gas constant

Stefen's constant

Boltzmann constant

Gravitation constant

Angular frequency 'w' is basically a characteristics of

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linear motion

circular motion

both of them

none of them

A closed surface contains two equal and opposite charges. The net electric flux from the surface will be

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Negative

Positive

Infinite

Zero

Waves transport energy

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without transport energy

with matter

both of them

none of them

Work is always done on a body when:

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A force acts on it

It moves through certain distance

None of A or B is correct

Both A and B is correct

Alfa particles are

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hydrogen nuclei

helium nuclei

electrons

photons

We can express the work in term of

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directly measurable variables

indirectly measurable variables

either of them

both of them

Velocity of a body changes if

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direction of motion the body changes

speed of the body changes

neither speed nor direction changes

either speed or direction changes

At points where the crest (or trough) of one wave coincides with the crest (or trough) of the other wave, the wave produces

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destructive interference

constructive interference

diffraction

dispersion

If a power 2 kilowatt is maintained for 0.5 minute the work done is

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3.6 × 10⁶ J

6.0 × 10⁵ J

6.0 × 10⁴ J

36.0 × 10⁵ J

A 2 kg body and a 2 kg body have equal momentum. if the kinetic energy of 3 kg body is 10 j. The K.E of 2 kg body will be

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6.66 j

15 j

22.5 j

45 j

Polaroid glass is used in sun glasses because

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It is fashionable

It has good color

It is cheaper

It reduces the light intensity to half on account of polarization

Solid Angle can be _________ only.

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Practically measure

theoretically measure

Both a and b

Sometimes practically measure and sometimes theoretically measure

In the hysteresis loop, when the current is reduced to zero, the material

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does not retain magnetism

retains not retain magnetism

retains strong magnetism

none of them

If we go above the surface of earth equal to the radius of earth than value of g

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g

g/4

g/9

g/2

A force of 12 N gives an acceleration of 4 ms^-2 to an object.The force required to give it an acceleration of 10 ms^-2is

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15 N

20 N

25 N

30 N

The uncertainty of any measurement may occur due to

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Limitation to an instrument

Natural vibrations of the object

Natural imperfections of a persons sense

All of these

Bernoulli s equation is applicable on

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Non viscous fluid only

Incompressible fluid only

Stream line flow

Ideal fluid

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