MULTIPLE CHOICE QUESTIONS AND ANSWERS : SET – 1
1. In which of the following will a piece of iron weigh most?
   (a) in air
   (b) in an atmosphere of oxygen
   (c) in an atmosphere of CO2
   (d) in vacuum
Ans: (d)
2. A man Jumping out of a moving train is thrown
   (a) forward
   (b) backward
   (c) sideways
   (d) None of the above
Ans: (a)
3. The principle on which a Jet engine works is
   (a) conservation of mass
   (b) Newtonian law of action and reaction
   (c) conservation of angular momentum
   (d) None of the above
Ans: (b)
4. It is easier to climb down a staircase than climb up because in climbing
   down
   (a) work is done against gravity
   (b) the steepness of the staircase isn"t felt
   (c) gravity assists
   (d) there is no friction between the legs and steps
Ans: (c)
5. A man stands in a lift which accelerates upwards. The resultant reaction
   force on the floor of the lift is
   (a) greater than the weight of the man
   (b) less than the weight of the man
   (c) same as the weight of the man
   (d) zero
Ans: (a)
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