The relationship between the force F and position x of a body is

Subject

Physics

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

If M is the mass ofthe earth and R its radius, the ratio of the gravitational acceleration and the gravitational constant is

  • R2M

  • MR2

  • MR2

  • MR


2.

A student unable to answer a question on Newton's laws of motion attempts to pull himself up by tugging on his hair. He will not succeed

  • as the force exerted is small

  • the frictional force while gripping, is small

  • Newton's law of inertia is not applicable to living beings

  • as the force applied is internal to the system


3.

Three long, straight parallel wires, carrying current, are arranged as shown in figure. The force experienced by a 25 cm length of wire C is

          

  • 5.2 × 103 N

  • 2.5 × 10-3 N

  • zero

  • 1.5 × 10-3 N


4.

A 5.0 amp current is setup in an external circuit by a 6.0 volt storage battery for 6.0 minutes. The chemical energy of the battery is reduced by

  • 1.08 × 104 J

  • 108 × 104 J

  • 1.8 × 104 J

  • 18 × 104 J


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5.

The adjacent figure is the part of a horizontally stretched net. Section AB is stretched with a force of 10 N. The tensions in the sections BC and BF are

               

  • 10 N, 11 N

  • 10 N, 6 N

  • 10 N, 10 N

  • can't be calculated due to insufficient data


6.

Out of the following four dimensional quantities, which one qualifies to be called a dimensional constant ?

  • Acceleration due to gravity

  • Surface tension of water

  • Weight of a standard kilogram mass

  • The velocity of light in vacuum


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7.

The relationship between the force F and position x of a body is as shown in figure. The work done in displacing the body from x = 1 m to x = 5 m will be

       

  • 30 J

  • 15 J

  • 25 J

  • 20 J


B.

15 J

Work done = area enclosed by F-x graph

    

= area of ABNM + area of CDEN − area of EFGH + area of HIJ

1 × 10 + 1 × 5 - 1 + 12 × 1 × 10

= 10 + 5 − 5 + 5

= 15 J


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8.

From the top of a tower of two stones, whose masses are in the ratio 1 : 2 are thrown on straight up with an initial speed u and the second straight down with the same speed u. Then neglecting air resistance

  • the heavier stone hits the ground with a higher speed

  • the lighter stone hits the ground with a higher speed

  • both the stones will have the same speed when they hit the ground

  • the speed can't be determined with the gven data


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9.

From the adjacent figure, the correct observation is

            

  • the pressure on the bottom of tank A is greater than at the bottom of B

  • the pressure on the bottom of the tank A is smaller than at the bottom of B

  • the pressure depends on the shape of the container

  • the pressure on the bottom of A and B is the same


10.

Which one of the following is not a unit of Young's modulus?

  • Nm-1

  • Nm-2

  • dyne cm-2

  • Mega pascal


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