Class X

Total energy of a body is sum of
  1. Kinetic energies
  2. Potential energies
  3. Forces
  4. Both a and b
 Distance travelled by light is called
  1. Second
  2. Candela
  3. Meter
  4. Kelvin
 Gain in kinetic energy is equal to
  1. loss in P.E - work against friction
  2. loss in K.E - work against friction
  3. loss in P.E + work against friction
  4. loss in P.E * work against friction
Body having weight 50 kg turning in a circle at 5 m s-1, if radius of circle is 5 m, force exerted on body to hold it in circular path is
  1. 200 N
  2. 250 N
  3. 450 N
  4. 300 N
Zero digit is only digit that
  1. Maybe significant
  2. May not be significant
  3. Is significant
  4. Both a and b
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