JEE Physics Solved Question Paper 2009 | Previous Year Papers | Zigya

Subject

Physics

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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1.

The number of significant figures in the numbers 4.8000 x 104 and 48000.50 are respectively

  • 5 and 6

  • 5 and 7

  • 2 and 7

  • 2 and 6


2.

A body of mass m moving along a straight line covers half the distance with a speed of 2ms-1. The remaining half of the distance is covered in two equal time intervals with a speed of 3 ms-1 and 5 ms-1 respectively. The average speed of the particle for the entire journey is

  • 38 ms-1

  • 83 ms-1

  • 43 ms-1

  • 163 ms-1


3.

The moment of inertia ofa circular ring of radius r and mass M about diameteris

  • 25 Mr2

  • Mr24

  • Mr22

  • Mr212


4.

A body of mass 0.05 kg is observed to fall with an acceleration of 9.5 ms-2. The opposing force of air on the body is (g = 9.8 ms-2)

  • 0.015 N

  • 0.15 N

  • 0.030 N

  • zero


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5.

Three concurrent co-planar forces 1 N, 2 N and 3 N acting along different directions on a body

  • can keep the body in equilibrium if 2 N and 3 N act at right angle

  • can keep the body in equilibrium if 1 N and 2 N act at right angle

  • cannot keep the body in equilibrium

  • can keep the body in equilibrium in 1 N and 3 N act at an acute angle


6.

Two rectangular blocks A and B of masses 2 kg and 3 kg respectively are connected by a spring of spring constant 10.8 Nm-1 and are placed on a frictionless horizontal surface. The block A was given an initial velocity of 0.15 ms-1. in the direction shown in the figure. The maximum compression of the spring during the motion is

               

  • 0.01 m

  • 0.02 m

  • 0.05 m

  • 0.03 m


7.

The work done by a force acting on a body is as shown in the graph. The total work done in covering an initial distance of 20 m is

            

  • 225 J

  • 200 J

  • 400 J

  • 175 J


8.

A door 1.6 m wide requires a force of 1 N to be applied at the free end to open or close it. The force that is required at a point 0.4 m distance from the hinges for opening or closing the door is

  • 1.2 N

  • 3.6 N

  • 2.4 N

  • 4 N


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9.

A planet revolves around the sun in an elliptical orbit. The linear speed of the planet will be maximum at

       

  • D

  • B

  • A

  • C


10.

Two sources are said to be coherent if they produce waves

  • having a constant phase difference

  • of equal wavelength

  • of equal speed

  • having same shape of wavefront


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