Thermal Process in Physics

An iron bar is held with one end in a fire. The other end soon becomes too hot to hold. hand
iron bar How has the heat travelled along the iron bar? 

•  by conduction
• by convection
• by expansion
• by radiation fire 

The diagram shows a block of ice placed in a warm room. At which point is the temperature the lowest?

• A
• B
• C
• D

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NGSS.MS-PS1-4

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The diagram shows a cooling unit in a refrigerator. Why is the cooling unit placed at the top? 

• Cold air falls and warm air is displaced upwards.
• Cold air is a bad conductor so heat is not conducted into the refrigerator.
• Cold air is a good conductor so heat is conducted out of the refrigerator.
• Cold air stops at the top and so prevents convection. 

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NGSS.MS-PS1-4

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How does heat from the Sun reach the Earth?

• conduction only
• convection only
• radiation only 
• conduction, convection and radiation

A beaker contains water at room temperature. How could a convection current be set up in the water?

• cool the water at X 
• cool the water at Y
• stir the water at X
• stir the water at Y 

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NGSS.MS-PS1-4

Which statement refers to convection?

• It does not involve energy transfer.
• It is the transfer of heat energy without the movement of particles.
• It only occurs in liquids or gases.
• It only occurs in solids. 

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NGSS.MS-PS3-4

Spoons made of different materials were placed in four cups of coffee poured from the same jug. Which spoon will be hottest to touch at end X? 

• A
• B
• C
• D

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A heater is placed in a room.
Which diagram shows the movement of air as the room is heated? 

• A
• B
• C
• D

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The diagrams show four identical pieces of ice that are heated in test-tubes of water. In which test-tube will the ice take the longest time to melt? 

• A
• B
• C
• D

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NGSS.MS-PS1-4

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A cup with a lid contains a hot drink.
When the lid is removed, the rate of heat loss from the drink increases. What causes this?

• convection only
• evaporation only
• both convection and evaporation
• neither convection nor evaporation

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NGSS.MS-PS1-4

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