The displacement in metres of a body varies with time t in second as y = t2 – t –The displacement is zero for a positive of t equal to
  • 1 s
  • 2 s
  • 3 s
  • 4 s
A boy starts from a point A, travels to a point B at a distance of 3 km from A and returns to A. If he takes two hours to do so, his speed is
  • 3 km/h
  • zero
  • 2 km/h
  • 1.5 km/h
A 180 metre long train is moving due north at a speed of 25 m/s. A small bird is flying due south, a little above the train, with a speed of 5 m/s. The time taken by the bird to cross the train is
  • 10 s
  • 12 s
  • 9 s
  • 6 s
A boy starts from a point A, travels to a point B at a distance of 1.5 km and returns to A. If he takes one hour to do so, his average velocity is
  • 3 km/h
  • zero
  • 1.5 km/h
  • 2 km/h
A body starts from rest and travels with uniform acceleration on a straight line. If its velocity after making a displacement of 32 m is 8 m/s, its acceleration is
  • 1 m/s²
  • 2 m/s²
  • 3 m/s²
  • 4 m/s²
Which one of the following is the unit of velocity?
  • kilogram
  • metre
  • m/s
  • second
A body starts from rest and travels for t second with uniform acceleration of 2 m/s². If the displacement made by it is 16 m, the time of travel t is
  • 4 s
  • 3 s
  • 6 s
  • 8 s
A body starts from rest and travels with an acceleration of 2 m/s². After t seconds its velocity is 10 m/s . Then t is
  • 10 s
  • 5 s
  • 20 s
  • 6 s
A body starts from rest. If it travels with an acceleration of 2 m/s², its displacement at the end of 3 seconds is
  • 9 m
  • 12 m
  • 16 m
  • 10 m
A body starts from rest and travels with uniform acceleration of 2 m/s². If its velocity is v after making a displacement of 9 m, then v is
  • 8 m/s
  • 6 m/s
  • 10 m/s
  • 4 m/s
A body starts from rest and travels with an acceleration of 2 m/s². After t seconds its velocity is 10 m/s. Then t is
  • 10 s
  • 5 s
  • 20 s
  • 6 s
A body starts from rest and travels for five seconds to make a displacement of 25 m if it has travelled the distance with uniform acceleration a then a is
  • 3 m/s²
  • 4 m/s²
  • 2 m/s²
  • 1 m/s²
A boy moves on a circular distance of radius R. Starting from a point A he moves to a point B which is on the other end of the diameter AB. The ratio of the distance travelled to the displacement made by him is
  • ∏/2
  • ∏
  • 2∏
  • 4∏
The dimensional formula for acceleration is
  • [LT2]
  • [LT?2]
  • [L2T]
  • [L2T2]
A body starts from rest and travels with uniform acceleration a to make a displacement of 6 m. If its velocity after making the displacement is 6 m/s, then its uniform acceleration a is
  • 6 m/s²
  • 2 m/s²
  • 3 m/s²
  • 4 m/s²
A ball is thrown into the air with an initial speed u. The time interval taken for the ball to rise to its maximum height is t1.The time interval taken for the ball to fall back from this maximum height is t2.Under real life condition, which of the following is satisfied
  • t2 > t1
  • t2 < t2
  • t2=t2
  • t1 > t2 if u is great enough
A body of mass m is dropped from a certain height.it has velocity v1 when it is at a height h1 above the ground.it has velocity v2 when it is at a height h2 above the ground. Which of the following is true?
  • v12-v22=2g(h1-h2)
  • v12-v22=2g(h2-h1)
  • v1-v2=√2g(√h2-√h1)
  • v1-v2=√2g(√h1-√h2)
Let v and a denote the velocity and acceleration respectively of the particle in one-dimension motion.
  • the speed of the particle decreases when v.a <0
  • the speed of the particle decreases when v.a >0
  • the speed of the particle increases when v.a=0
  • the speed of the particle decreases when |v| < |a|
The displacement time graph for the two particles A and B are straight lines inclined at angles 30° and 60° with the time axis. The ratio of the velocities $V_A :V_B$ will be
  • 3 :1
  • $1 : \sqrt 3$
  • 1 : 3
  • $\sqrt 3 : 1$
A lift is coming from 8th floor and is just about to reach 4th floor. Taking ground floor as origin and positive direction upwards for all quantities, which one of the following is correct?
  • x < 0, v < 0, a > 0
  • x > 0, v < 0, a < 0
  • x > 0, v < 0, a > 0
  • x > 0, v > 0, a < 0
0 h : 0 m : 1 s

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