Class XI

in every conservation principle
  1. a physical quantity like energy is converted into mass
  2. a physical quantity for example total momentum does not change in a phenomenon. The quantity has the same value before and after the phenomenon.
  3. a physical quantity like mass is converted into energy
  4. a physical quantity changes to a form of energy
Validity of the conservation of momentum is
  1. in only cases involving billiard balls
  2. in all domains including domains where Newton’s laws may not be valid
  3. in only those domains where quantum laws are valid
  4. in only those domains where Newton’s laws are valid
Strong Nuclear Force has
  1. is exerted by electromagnetic fields
  2. short range compared to electromagnetic forces
  3. long range compared to gravitational forces
  4. long range compared to electrical forces
What is the correct sequence of events technology gives rise to new science or new science gives rise to technology?
  1. technology and science are independent
  2. Both can happen. Science can give rise to technology and technology can give rise to new science
  3. technology can give rise to new science only
  4. Science can give rise to technology only
for motion under an external conservative force
  1. the total mechanical energy i.e. the sum of kinetic and potential energy of a body is a constant
  2. the total mechanical energy i.e. the sum of kinetic and potential energy of a body is a constant only if there is no motion
  3. the mechanical energy i.e. the potential energy of a body is a constant
  4. the mechanical energy i.e. the kinetic energy of a body is a constant
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