NEET Important Questions of Motion in Straight Line | Zigya

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 Multiple Choice QuestionsMultiple Choice Questions

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1.

A block is kept on a frictionless inclined surface with angle of inclination α. The incline is given an acceleration a to keep the block stationary. Then a is equal to

  • g/tanα

  • g cosecα

  • g

  • g

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2.

A body of mass m is accelerated uniformly from rest to a speed v in a time T. The instantaneous power delivered to the body as a function time is given by

  • fraction numerator mv squared over denominator straight T squared. end fraction straight t
  • mv squared over straight T squared. straight t squared
  • 1 half mv squared over straight T squared. straight t
  • 1 half mv squared over straight T squared. straight t
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3.

A particle moves in a straight line with retardation proportional to its displacement. Its loss of kinetic energy for any displacement x is proportional to

  • x2

  • ex

  • x

  • x

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4.

A ball is thrown from a point with a speed ν0 at an angle of projection θ. From the same point and at the same instant person starts running with a constant speed ν0/2 to catch the ball. Will the person be able to catch the ball? If yes, what should be the angle of projection?

  • yes, 60°

  • yes, 30°

  • no

  • no

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5.

All the graphs below are intended to represent the same motion. One of them does it incorrectly. Pick it up.


6.

A person observes that the full length of a train subtends an angle of 15°. If the distance between the train and the person is 3 km, the length of the train, calculated using parallax method, in meters is

  • 45

  • 45 π

  • 250 π

  • 75 π


7.

The following figure gives the movement of an object. Select the correct statement from the given choices.

       

  • The total distance travelled by the object is 975 m

  • The maximum acceleration of the object is 2m/s2

  • The maximum deceleration happend between 25th and 85th seconds

  • The object was at rest between 10th and 15th seconds


8.

Two object P and Q, travelling in the same direction starts from rest. While the object P starts at time t = 0 and object Q starts later at t = 30 min. The object P has an acceleration of 40 km/h2. To catch P at a distance of 20 km, the acceleration of Q should be

  • 40 km/h2

  • 80 km/h2

  • 160 km/h2

  • 120 km/h2


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9.

A train of length L move with a constant speed Vt. A person at the back of the train fires a bullet at time t = 0 towards a target which is at a distance of D (at time t = 0) from the front of the train (on the same direction of motion). Another person at the front of the train fires another bullet at time t = T towards the same target. Both bullets reach the target at the same time. Assuming the speed of the bullets Vb are same, the length of the train is

  • T × (Vb × 2Vt)

  • T × (Vb + Vt)

  • 2VbDVb + Vt + T Vb - Vt

  • T × (Vb − 2Vt)


10.

A person from a truck, moving with a constant speed of 60 km/h, throws a ball upwards with a speed of 60 km/h. Neglecting the effect of Earth and choose the correct answer from the given choice.

  • The person cannot catch the ball when it comes down since the truck is moving

  • The person can catch the ball when it comes down, if the truck is stopped immediately after throwing the ball

  • The person can catch the ball when it comes down, if the truck continues to move with a constant speed of 60 km/h

  • The person can catch the ball when it comes down, if the truck moves with speed more than 60 km/h


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