Class X

We can say that one watt is defined as
  1. Rate of work done or energy conversion of one joule per second
  2. Rate of time of one second per joule
  3. Rate of distance of one meter per joule
  4. Rate of work done or energy conversion of one joule per meter
Convectional current only occurs in
  1. liquids
  2. Gases
  3. Liquids and gases both
  4. Solids
 Gases are
  1. Very compressible
  2. Very little compressible
  3. Incompressible
  4. B and C both
Knocking a nail into a wooden block with a hammer involves conversion between different forms of energy, which of following choices present this conversion in correct order.
  1. Chemical energy → gravitational potential energy → kinetic energy → (sound energy + heat energy)
  2. Chemical energy → kinetic energy → gravitational potential energy → (sound energy + heat energy)
  3. (Sound energy + heat energy) → chemical energy → kinetic energy → gravitational potential energy
  4. Chemical energy → (sound energy + heat energy) → kinetic energy → gravitational potential energy
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