Challenge level 1

What are the three states of matter?

• solid, water and air

• solid, liquid and gas

• heat, temperature and effects

What is a heat source?

• Something that gains heat

• Something that feels hot to the touch

• Something that gives off heat

• Something that glows

When objects are at different temperatures,

• heat flows from the hotter to colder object.

• heat flows from colder to the hotter object.

• heat flows from the objects to the surroundings.

• no heat flows until all temperature are the same.

Recall the experiment carried out for WS 2.4, which of the following is the hotter object?

• the flask

• the balloon

• the air in the flask

• the water in the beaker

When the flask was immersed into the hot water, which of the following describes the flow of heat correctly?

• Only the balloon gained heat from the hot water.

• Only the flask gained heat from the hot water.

• The flask and air in the flask gained heat from the hot water.

• The air in the flask lost heat to the hot water.

Which of the following correctly explains why the balloon inflated?

• Hot water gained heat and expanded.

• The balloon gained heat and expanded.

• The air in the flask gained heat and expanded.

• The flask gained heat and expanded.

The metal ball and metal ring experiment showed that

• solid gains heat and expands, loses heat and contracts.

• solid gains heat and contracts, loses heat and expands.

• solid expands and gains heat, contracts and loses heat.

• solid expands when it gives out heat and contracts when it takes in heat.

The experiment 2.3 with coloured water in glass tube shows that _______ gains heat and ________, loses heat and _________.

• solid / liquid / gas

• solid / expands / contracts

• liquid / expands / contracts

• gas / expands / contracts

Which one of the following statements is incorrect about the effects of heat?

• All matter expand when they gain heat, contract when they lose heat.

• All matter increase in temperature when they gain heat, decrease in temperature when they lose heat.

• All matter becomes room temperature after being left out in the open for a long time.

• Gas has no definite volume and so it cannot expand or contract.

Which of the following materials will feel the hottest when left under the hot sun for an hour?

• Plastic

• Metal

• Fabric

• Wood