Question # 1

A train cover 90 km in half an hour. the time taken by it to travel 15 km will be:

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20 minutes

48 minutes

10 minutes

5 minutes

Average value of A.C voltage during one cycle is

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1

Zero

Maximum

Variable

The direction of the linear momentum is the direction of

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speed

velocity

weight

none of them

When we consider the average velocity of a body, then the body is moving in

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straight line

curved path

may be in a straight or curved path

none of them

The expression F x t is called impulse if the time 't' is

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zero

very large

very small

infinite

Hotness and coldness of an object is represented in terms:

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Heat

Temperature

Chemical energy

None of these

The pressure will be low where the speed of the fluid is

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Zero

High

Low

Constant

First law of thermodynamic is special case of

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Law of conservation of energy

Charle's law

Law of conservation of mass

Boyle's law

Resistance of a conductor is increased, the currant will

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Decrease

Increase

Remain the same

None of these

It two waves of amplitude 'a' produce a resultant wave of amplitude a, then the phase difference between them will be

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60°

90°

120°

180°

During each cycle, alternating voltage reaches a peak value

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One time

Two times

Four times

A number of times depending on the frequency

Waves transport energy

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without transport energy

with matter

both of them

none of them

The effect of friction between different layers of a flowing fluid is described in terms of

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motion of fluid

nature of fluid

colour of fluid

viscosity of fluid

If a freely oscillating system is subjected to an external force, then

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free vibrations will take place

the body will move with its natural frequency

forced vibrations will take place

none of them

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

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number of photoelectrons

size of the photoelectrons

charge on photoelectrons

K.E of photoelectrons

A certain force gives an acceleration of 2 m/sec²to a body mass 5 kg. The same force would give a 20 kg object an acceleration of:

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0.5 m/sec²

5 m/sec²

1.5 m/sec²

9.8 m/sec²

The equation of continuity is

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A₁A_{2 = V}₁V₂

A_1/_V_{1 =}A_2/V₂

_V_1/A₁₌V_2/A₂

A₁_V_{1 =}A₂V₂

For the normal operation of the transistor, its

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emitter-base and collector base junctions are forward biased

emitter-base junction is reversed biased and collector base junction is forward biased

emitter-base junction is forward biased and collector-base junction is reverse biased

any one of these

Which of these is not a radiation detector

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Wilson cloud chamber

cyclotron acceleration

Geiger Miller counter

solid state detector

Fluid A is more viscous than fluid B. While flowing through a pipe of the same dimensions and material which fluid takes longer to travel at 25°C?

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fluid B

fluid A

both take the same time

not possible to determine from given information

A car battery has e.m.f 12 volt and internal resistance 5 x 10^-2ohm. If it draws 60 ampere current, the terminal voltage of the battery will be

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5 volt

3 volt

15 volt

9 volt

The r.m.s. value of alternating current is equal to its maximum value at angle of

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60°

45°

30°

90°

Rate of decay is actually described by.

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Half line

Decay constant

Mean life

Total life

None of these

First law of thermodynamics is consequence of conservation of

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Work

Energy

Heat

All of these

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

During the nuclear changes, the law/s of conservation that hold/s are that of:

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Charge

energy

Momentum

Mass

All of these

If v is the velocity of flow of liquid through a tube of area of cross-section A, then according to equation of continuity

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v/A = constant

A/v = constant

Av = constant

None

The dimension of linear inertia is:

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MLT²

ML⁰T^-2

ML⁰T⁰

MLT^-1

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

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100 J

1.6 x 10^-17J

100 eV

1.6 x 10^-17eV

The direction of induced current is always so as to oppose the cause which produces it. This is

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Lenz's law

Ampere's law

Faraday's law

Coulomb's law

None of these

The free electrons in metals:

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Are in random motion and their speed depends upon temperature

Move in particular direction

Move with speed of light

Move such that their speed does not depend on their temperature

None of these

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