QUIZ_G10_THERMAL PHYSICS

The picture shows a bimetallic strip in a fire alarm. When there is a fire outbreak, the bimetallic strip will get hot, ....

• bend downwards, complete the circuit and the alarm rings.

• bend upwards, open the circuit and the alarm will not ring.

• becomes longer, open the circuit and the alarm will not ring.

Alex noticed that a metal door that sticks on hot days does not stick when it cools off at night. This is because the metal contracts as it cools. The reason for this is that, as the metal cools, the atoms:

• become smaller and take up less space
•  slow down and move closer together
• merge together to form fewer atoms
• speed up and move farther apart

The diagram shows electricity cables being put up on a warm day. The cables are left loose

between the poles, as shown in the diagram.

Why are the cables left loose?

• They will expand on very warm days.

• They will expand on cold days.

• They will contract on very warm days.

• They will contract on cold days.

Ali pours water into a glass dish. He leaves the dish in a warm place for 8 days. After 8 days, there is less water in the dish. Why does the dish contain less water?

• The water evaporated.

• The water froze.

• The water condensed.

• The water boiled.

When does sweat help to cool you down?

• When it is coming out your pores

• When it is covering your skin

• When it is evaporating from your skin

A liquid is evaporating. The liquid is not boiling.

Which statement about the liquid is correct?

• Any molecule can escape, and from any part of the liquid.

• Any molecule can escape, but only from the liquid surface.

• Only molecules with enough energy can escape, and only from the liquid surface.

• Only molecules with enough energy can escape, but from any part of the liquid.

A swimmer feels cold after leaving warm water on a warm, windy day.

Why does she feel cold even though the air is warm?

• The less energetic water molecules on her skin escape quickly.

• The more energetic water molecules on her skin do not escape quickly.

• The water on her skin does not evaporate quickly enough to keep her warm.

• The water on her skin evaporates quickly and cools her skin.

Which will heat up faster?

• copper

• granite

• iron

• basalt

Which of the following best explains why the sand at the beach is hotter than the water?

• Sand has a higher specific heat than water.

• Sand has a lower specific heat than water.

• There is more water than sand at the beach.

• There is more sand than water at the beach.

Copper, Stainless Steel, Carbon Steel, and Zinc were all heated using the same thermal energy.  What material would be the coolest after being heated?

• Copper
• Carbon Steel
• Zinc
• Stainless Steel