Question # 1

The earliest heat engine was

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petrol engine

diesel engine

electric engine

steam engine

The percentage of available heat energy converted into work by a diesel engine is roughly

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35 %`

40 %

35 - 40 %

25 %

Conventional the angular Velocity is Directed at an angle of:

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90° to the axis of rotation

30° to the axis of rotation

0° to the axis of rotation

None of above

The isotope/s of hydrogen is /are:

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Protium

Deuterium

Tritium

Both (A) and (B)

All of these

When two progressive waves of nearly same frequencies superimpose and give rise to beats, then

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Frequency of beat changes with time

Frequency of beat changes with location of observer

All particles of medium vibrate simple harmonically with frequency equal to the difference between frequencies of component waves

Amplitude of vibration of particles at any point changes simple harmonically with frequency equal to difference between two component waves

The only significant motion possessed by the mono-atomic gas represented is:

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Translatory

Rotatory

Vibratory

None of these

With the increase of temperature viscosity

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Increase

Decrease

Remains same

Doubles

In bringing an electron towards another electron, electrostatic potential energy of system

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Decreases

Increases

Remains uncharged

Becomes zero

Photocell is a device which converts

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chemical energy into electrical energy

electrical energy into light energy

heat energy into electrical energy

light energy into electrical energy

At 'resonance' the transfer of energy from deriving source to the oscillator is

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maximum

minimum

zero

none of them

The figure 1.007276μ shows the mass of an:

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Atom

Positron

Electron

Neutron

Proton

The concept of entropy was introduced in the thermodynamics by

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kelvin

Clausius

Carnot

None of these

The speed of commercial jet (air liner) is

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200 ms^-1

267 ms^-1

327 ms^-1

335 ms^-1

Donor impurities donate

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Holes

Electrons

Both holes and electrons

None of them

Angular displacement is a vector quantity for

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Small value of Δθ

Very small value of Δθ

All values of Δθ

None of these

In Michelsion's interferometer, if a dark fringe is seen in the beginning, the next dark fringe will appear by moving the moveable mirror through a distance

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λ/2

λ/4

λ

2λ

If we keep the moment arm, fixed while change the force, then, the torque is

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Changed

Does not change

Some what change

None of these

The value of universal gas constant R is:

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8.314 J/K mole K

8314 J/ mole K

8.314 J/ mole K

None of these

The highest efficiency of a heat engine whose lower temperature is 17°C and the high temperature of 200°C is

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70%

100%

35%

38%

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 two vectors to be combined have magnitude 60 N and 35 N. Pick the correct answer from those given below and tell why is it the only one of the three that is correct.

(i) 100 N

(ii) 70 N

(iii) 20 N

Choose an answer

(i) is correct

(ii) 20 N

(iii) is correct

(ii) may be correct

An automobile moves with constant speed along a circle of radius 40 m. It takes 2 μ second to complete one circle,The average speed for one complete circle is

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20 ms^-1

40 ms^-1

60 ms^-1

0 ms^-1

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