Class VII

Thermos is also known as
  1. Temperature flask
  2. Heat flask
  3. Thermal flask
  4. Vacuum flask
In a thermograph, heat is identified by
  1. different sizes of lines on the photograph
  2. different shapes on the photographs
  3. different colors on the photographs
  4. different densities on the thermograph
Air is
  1. thermal conductor
  2. thermal insulator
  3. electrical conductor
  4. an electrolyte
Electricity companies use thermal imaging camera to identify
  1. the resistivity of a wire
  2. the resistivity of a resistor
  3. overheating of wires and power lines
  4. the heat released by each electrical appliance
Birds trap air between spaces of their feathers, because is
  1. thermal conductor
  2. thermal insulator
  3. electrical conductor
  4. an electrolyte
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