Concept 2.2

During changing of any matter from one state to another its mass --------

• decrease

• increase

• doesn't change

• is doubled

On heating some water, heat is transferred through water by ------

• convection

• conduction and radiation

• radiation

• radiation and convection

If you wanted to design a tool to hold hot things such as burning coal. Which of the following you can use to make this tool? -----

• Metal

• Thermal conductor material

• Iron

• Thermal insulator material

Heat starts to transfer between two objects when thermal equilibrium occurs between them.

• True

• False

Iron resists the transfer of thermal energy.

• True

• False

Heat transfers from ---- object to ----- object.

Heat is transferred through iron by -----, while it is transferred through tea by --------

Correct the underlined word:

Matter can be created or destroyed but it just changes from one state to another.

Give a reason for:

Potential energy of a marble decreases when it moves down on a slide.

What happens if:

Increasing the surface area of two touched objects with different temperatures.