CBSE  /  Class 11  /  Physics  /  Motion in a Straight Line

  • 1. 
    The displacement in metres of a body varies with time t in second as y = t2 – t – 2. The displacement is zero for a positive of t equal to

  • 1 s
  • 2 s
  • 3 s
  • 4 s

  • 2. 
    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

  • 3. 
    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

  • 4. 
    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

  • 5. 
    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

  • 6. 
    Which one of the following is the unit of velocity?

  • kilogram
  • metre
  • m/s
  • second

  • 7. 
    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

  • 8. 
    The dimensional formula for speed is

  • T
  • LT
  • LT
  • LT

  • 9. 
    The dimensional formula for velocity is

  • [LT]
  • [LT]
  • [L2T]
  • [LT]

  • 10. 
    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
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