The motor nerve

  1. Carries impulses from the receptors to the brain
  2. Carries impulses from the heart to the brain
  3. Carries impulses from the brain to the different organs
  4. None of these

Ice blocks are covered with sawdust

  1. To prevent the dust from collecting on the ice
  2. Because ice being cold cannot be lifted with bare hands
  3. to provide necessary insulation from heat
  4. None of these

Silicon is a

  1. Semi-conductor
  2. Insulator
  3. Superconductor
  4. None of these

Plutonium is used as

  1. Fuel for nuclear fission
  2. Fuel for nuclear fusion
  3. Source of chemical energy
  4. None of these