Class XI

A stone of mass 0.25 kg tied to the end of a string is whirled round in a circle of radius 1.5 m with a speed of 40 rev./min in a horizontal plane. What is the tension in the string ?
  1. 6.6 N
  2. 6.1 N
  3. 6.9 N
  4. 6.3 N
When an object undergoes acceleration
  1. there is always an increase in its velocity
  2. there is always an increase in its speed
  3. a force always acting on it
  4. all of the above
Two bodies of masses 10 kg and 20 kg respectively kept on a smooth, horizontal surface are tied to the ends of a light string. a horizontal force F = 600 N is applied to the 10 kg mass so as to pull it. What is the tension in the string ?
  1. 400 N
  2. 300 N
  3. 450 N
  4. 370 N
A nucleus is at rest in the laboratory frame of reference. If it disintegrates into two smaller nuclei
  1. the products must move in same direction.
  2. the products must move at an angle in opposite directions.
  3. the products must move in opposite directions.
  4. the products must move at an angle in same direction.
A car accelerates at 1.5 m/s 2 in a straight road. How much is the increase in velocity in 4s ?
  1. 6 m/s
  2. 4 m/s
  3. 3 m/s
  4. 2.66
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