Two masses are attached to a rod end to end. If torque is ap

Subject

Physics

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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1.

Two masses are attached to a rod end to end. If torque is applied they rotate with angular acceleration α. If their distances are doubled  and same torque is applied, then they move with angular acceleration

  • 4 α

  • α

  • 3 α

  • α/4


D.

α/4

Suppose the masses m1 and  m2 are attached to the ends of a massless rod. C1 is the axis of rotation which is at a distance R from each of the masses.

 ∴ The moment of inertia of the system,

    I  = m1R2 + m2R2

    I  = ( m1 + m2 ) R2  

Now if the distance between the masses is doubled, then the moment of inertia

  I' = m1 ( 2R )2 + m2 ( 2R2 )

  I' =  ( m1 + m2 ) 4R2

Since the same torque torque is applied in both the cases.

 τ = Iα = I' &alpha'


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2.

A particle is revolving in a circle of radius R. If the force acting on it is inversely proportional to R, then the time period is proportional to

  • R

  • R2

  • 1/R

  • 1/R2


3.

Speed in kilometre per hour in S.I unit is represented as

  • KMPH

  • Kmhr-1

  • Kmh-1

  • kilometre/hour


4.

If mass of an atom M moving with speed v, what will be its speed after the emission of an α-particle is zero?


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5.

A body of mass M moving with velocity V explodes into two equal parts. Id one comes to rest and the other moves with velocity v, what would be the value of v?

  • V

  • V2

  • 4V

  • 2V


6.

The orbital velocity of an artificial satellite in a circular orbit above the earth's surface at a distance equal to radius of earth is v. For a satellite orbiting at an altitude half of earth's radius, orbital velocity is

  • 32v

  • 32 v

  • 23v

  • 23v


7.

S.I unit of velocity is 

  • ms

  • m sec-1

  • m hr-1

  • m/hr


8.

Maximum energy transfer for an elastic collision will occur if one body is at rest when

  • m1 = m2

  • m212m1

  • m>>  m2

  • m2 >> m1


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9.

Which of the following is path dependent?

  • U

  • PdV

  • P

  • V


10.

Escape velocity of a rocket is 11.2 km/sec. It is released at an angle of 45°. Its escape velocity is

  • 11.2 m/sec

  • 11.22 km/sec

  • 11.2 km/sec

  • 22.3 km/sec


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