Class XI

Two bodies of masses m1 and m2 have equal kinetic energies. If p1 and p2 are their respective momentum, then ratio p1 : p2 is
  1. m1 : m2
  2. m2 : m1
  3. √m1 : √m2
  4. m12 : m22
Which of the following is NOT correct?
  1. energy is the ability of doing work
  2. Work can be expressed as Force x Displacement
  3. unit of power is Joule
  4. power is the amount of work done per unit of time
Newton-meter is the SI unit of
  1. acceleration
  2. work
  3. power
  4. Force
Which of the following is/are example(s) of Potential Energy
  1. A moving car
  2. A battery
  3. A book resting on the table
  4. both b and c
Considering air resistance negligible, the sum of potential and kinetic energies of the free falling body would be
  1. zero
  2. would increase
  3. would decrease
  4. remains fixed
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