The quantities RC and LR (where R, L and C stand for resista

Subject

Physics

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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1.

The quantities RC and LR (where R, L and C stand for resistance, inductance and capacitance respectively) have the dimensions of

  • force

  • linear momentum

  • linear acceleration

  • time


D.

time

In electrical circuits dimensions of LR, RC, LC have the dimensions of time.


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2.

The number of significant figures in 0.002305 is

  • 6

  • 4

  • 7

  • 2


3.

A body travelling with uniform acceleration crosses two points A and B with velocities 20 ms-1 and 30 ms-1 respectively. The speed of the body at the mid-point of A and B is nearest to

  • 25.5 ms-1

  • 25 ms-1

  • 24 ms-1

  • 106 ms-1


4.

An aeroplane flies around a square field ABCD of each side 1000 km. Its speed along AB is 250 kmh-1, along BC 500 kmh-1, along CD 200 kmh-1 and along DA 100 kmh-1. Its average speed (in kmh-1)over the entire trip is

  • 225.5

  • 175.5

  • 190.5

  • 310.5


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5.

Free fall of an object (in vacuum) is a case of motion with

  • uniform velocity

  • uniform acceleration

  • variable acceleration

  • constant momentum


6.

The maximum height of a projectile is half of its range on the- horizontal. If the velocity of projection is u, its range on the horizontal is

  • 2u25g

  • 3u25g

  • 4u25g

  • u25g


7.

A stone of mass 2 kg is tied to a string of length 0.5 m. If the breaking tension of the string is 900 N, then the maximum angular velocity, the stone can have in uniform circular motion is

  • 30 rad s-1

  • 20 rad s-1

  • 10 rad s-1

  • 25 rad s-1


8.

The position of a particle is given by r = 2t2 i^ + 3t j^ + 4 k^, where t is in second and the coefficients have proper units for r to be in metre. The a t of the particle at t = 1 s is

  • 4 ms-2 along y-direction

  • 3 ms-2 along x-direction

  • 4 ms-2 along x-direction

  • 2 ms-2 along z-direction


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9.

A passenger getting down from a moving bus, falls in the direction of the motion of the bus. This is an example for

  • moment of inertia

  • second law of motion

  • inertia of motion

  • inertia of rest


10.

A body of mass 6 kg is hanging from another body of mass 10 kg as shown in figure. This combination is being pulled up by a string with an acceleration of 2 ms-2. The tension T1 is, (g =10 ms-2)

  • 240 N

  • 150 N

  • 220 N

  • 192 N


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