F2 C9 Heat

Which of the following is not true about heat?

• Heat is a form of energy.

• Heat cannot be measured.

• Heat cannot be seen.

• Heat can be transferred through vacuum.

Which of the following material is most suitable to use as a heat insulator at the wall of ice box?

• Wood

• Polystyrene

• Plastic

• Aluminium

Diagram shows a coastal area during the night. Which of the following gives the correct flow of air at the moment shown in the diagram?

• T → V

• T → S

• S → U

• U → V

Diagram shows an experiment conducted to investigate the transfer of heat through different substances. The rods are heated and time taken for each thumbtack to fall is recorded.

Arrange the rod based on the time taken for thumbtack to fall in ascending order.

• Copper, aluminum, iron, glass

• Iron, glass, copper, aluminum

• Glass, iron, aluminum, copper

• Aluminum, copper, glass, iron

Which of the following is correct about conduction? (may be one or more answer)

• The process of heat transfer is faster than convection

• The process of heat transfer is slower than convection

• Occurs in solid

• Occurs in vacuum

Heat flows from __________ region (area) to __________ region (area).

• cooler, hotter

• hotter, cooler

In __________, heat transfer through solid.

• convection

• radiation

• conduction

The Sun transfers heat to the earth through ___________.

• convection

• conduction

• radiation

____________ colour can release/ emit heat faster.

• light

• dark

In the fire alarm, the bimetallic strip __________ when heated.

• breaks

• bends

• expands

• contracts