Question # 1

Efficiency of carnot engine is independent of the

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temperature of sink

temperature of source

nature of the working substances

none of them

The value of threshold frequency for different metals is

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different

same

may be different or may be same

none of these

Associated with the motion of a driven harmonic oscillator, there is a very striking phenomenon, know as

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waves

beat

interference

resonance

Energy is not carried by

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Transverse progressive waves

Longitudinal vibration

Stationary waves

Electromagnetic

The half lie of radium-226 is

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238 years

4.5 x 10⁹days

1620 years

332 years

A process is a reversible process, if the entropy of the system

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increases

decreases

remains constant

none of them

Which one of the following physical quantities changes with relativistic speed

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Length

Mass

Time

All of the above

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

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pair production

Compton effect

photoelectric effect

relativity

The behaviour of gases is well accounted by the kinetic theory based on

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microscopic approach

macroscopic approach

both of them

none of them

The ratio of linear stress/linear strain is called as

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Yong's modulus

Bulk modulus

Shear modulus

Modulus

A particle of mass 0.5 g moving along x-axis is located of x₁= 15 m at t₁= 5s and x₂= 33 m at t₂= 13s its average velocity is

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6 m s^-1

2.45 m s^-1

2.25 m s^-1

4.45 m s^-1

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

Joule-second is the unit of:

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Energy

Heat

Planck’s constant

None of these

The perpendicular distance form the line of action of force to the pivot point is called

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couple arm

angular distance

moment arm

none of them

A train if 150 m length is going towards north direction at a speed of 10 ms^-1. A parrot flies at a speed of 5 ms^-1 towards south direction parallel to the railway track.The time taken by the parrot to cross the train is equal to

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12 s

8 s

15 s

10 s

The fringe spacing in case of red light

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Increases

Decreases

Remains the same

None of these

A church organ consist of open ended pipes ranging from 4m to 4 mm, if the speed ofsound is considered as 400 m/s then the min and max frequency is:

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400 Hz and 4 kHz

100 Hz and 100 kHz

50 Hz and 50kHz

400 Hz and 400 kHz

Deceleration means the speed of the body is

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Increasing

Decreasing

Just moving

None of these

The turning effect of force is called

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torque

moment of force

both of them

none of them

The average normal temperature of human body is

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98.4°C

18.4°C

37°C

20°C

Stress is defined in terms of:

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Applied force

Deformation

Formation

Any of these

None of these

The dimensional formula of torque is:

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[ML²T^-2]

[MLT^-2]

[ML^-1T²]

[ML^-2T^-2]

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