Heat (NT Science)

Which direction is heat flowing in the picture?

• from the hand to the ice
• from the ice to the hand
• heat is not being transferred
• there is no way to tell

In heat transfer, heat always flows from the _______________ substance to the _______________ substance.

• Hotter to colder

• Colder to hotter

• Hotter to hotter

• Colder to colder

When a long thin bar of copper is evenly heated along its length, the bar will become ....................

• shorter

• longer

• lighter

• heavier

When heated, brass expands more than iron.

How would the shape of the bimetallic strip change after heating?

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When heated, brass contracts more than iron.

How would the shape of the bimetallic strip change after being placed in a freezer?

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Long pipes carrying hot liquid often have bends in them.

The bend is needed to ......

• allow for pressure changes.

• allow for expansion.

• reduce the flow of water.

• make the pipe stronger.

What happens when a solid gains heat?

• The solid expands and increases in volume.

• The solid expands and decreases in volume.

• The solid contracts and increases in volume.

• The solid contracts and decreases in volume.

When the round-bottomed flask is placed in a basin of hot water, what will happen to the liquid level in the thin tube?

• The liquid level in the thin tube will stay at the same level.

• The liquid level in the thin tube will rise.

• The liquid level in the thin tube will drop.

What can be done to ensure that the tracks do not become crooked like this? You may choose more than one answer.

• Expansion gap should be included between adjacent tracks.

• A shorter track should be used.

• A longer track should be used.

What is temperature?

• Temperature is a form of energy that flows from a region with higher temperature to a region with lower temperature.

• Temperature is a force that can move objects from one place to another.

• Temperature is a process that causes matter to change in states.

• Temperature is a measure of the degree of hotness or coldness of an object.