A glass marble projected horizontally from the top of a table fal

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 Multiple Choice QuestionsMultiple Choice Questions

181.

Two bodies are thrown up at angles of 40° and 60°, respectively, with the horizontal. If both bodies attain the same vertical height, then the ratio of velocities with which these are thrown is:

  • 23

  • 23

  • 32

  • 32


182.

An arrow is shot, its range is 200 m and its time of flight is 5 s. If g =10 m/s2, then the horizontal component of velocity of the arrow is :

  • 12.5 m/s

  • 250 m/s

  • 31.25 m/s

  • 40 m/s


183.

If ar and at represent radial and tangential accelerations, the motion of a particle will be uniformly circular if :

  • ar = 0 and at = 0

  • ar = 0 and at ≠ 0

  • ar ≠ 0 and at = 0

  • ar ≠ 0 and at ≠ 0


184.

Mark the correct option.
If a ball is projected with velocity v0 at an angle of elevation 30°, then

  • gravitational potential energy will, be minimum at the highest point of the trajectory

  • kinetic energy will be zero at the highest point of the trajectory

  • vertical component of momentum will be conserved

  • horizontal component of momentum will be conserved


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185.

A wheel completes 2000 turns in completing a distance of 9.5 km, then diameter of the wheel is

  • 1.5 m

  • 1.5 cm

  • 7.5 m

  • 7.5 cm


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186.

A glass marble projected horizontally from the top of a table falls of a distance x from the edge ofthe table. If h is the height of the table, then the velocity of projection is

  • h g2 x

  • x  g2h

  • gxh

  • g x + h


B.

x  g2h

t = 2hg           x = v 2hg                            v = x g2h


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187.

If a and b are two vectors, then the value of

      (a × b) × (a − b) is

  • 2 (b x a)

  • − 2(b x a)

  • b x a

  • a x b


188.

The maximum range of a gun on horizontal terrain is 16 km if g = 10 m/s2. What must be the muzzle velocity of the shell?

  • 200 m/s

  • 100 m/s

  • 400 m/s

  • 300 m/s


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189.

A body is thrown with a velocity of 9.8 m/s making an angle of 30° with the horizontal. It will hit the ground after a time

  • 1.5 s

  • 1 s

  • 3 s

  • 2 s


190.

A ball is projected horizontally with a velocity of 5 m/s from the top of a building 19.6 m high, flow long will the ball take to hit the ground?

  • 2 s

  • 2 s

  • 3 s

  • 3 s


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