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Conduction, convection and radiation

7th grade (Year 8 in England) · 16 questions · Common Core: NGSS.MS-PS3-3, NGSS.MS-PS3-4 · England: KS3 Physics: Energy (energy changes and transfers), KS3 Physics: Matter (energy in matter)

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1
Question 1
Why does a thermos flask (vacuum flask) keep drinks hot?
- A. Plastic makes heat
- B. It traps cold out by magic
- C. It contains a heater
- D. The vacuum stops conduction and convection; shiny walls reduce radiation
2
Question 2
Which kind of energy transfer is this: feeling the Sun's warmth on your face?
- A. conduction
- B. convection
- C. radiation
3
Question 3
Heat transfer: which statement is NOT true?
- A. Metals are good thermal conductors.
- B. Dark, matt surfaces are good absorbers and emitters of infrared radiation.
- C. Air trapped in materials makes good insulation.
- D. Cold flows into warm objects.
4
Question 4
Why is a radiator usually placed low down near a wall?
- A. It works only near walls
- B. Warm air rises from it and sets up a convection current around the room
- C. So it can conduct heat through the floor
- D. Because cold air rises
5
Question 5
Which kind of energy transfer is this: hot air rising from a radiator?
- A. conduction
- B. convection
- C. radiation
6
Question 6
Heat transfer: which statement is NOT true?
- A. Dark, matt surfaces are good absorbers and emitters of infrared radiation.
- B. Air trapped in materials makes good insulation.
- C. Coats make heat.
- D. Metals are good thermal conductors.
7
Question 7
How does the Sun's energy reach Earth?
- A. by conduction through space
- B. by convection currents in space
- C. by radiation, through empty space
- D. through cables
8
Question 8
Which kind of energy transfer is this: feeling the Sun's warmth on your face?
- A. conduction
- B. convection
- C. radiation
9
Question 9
Heat transfer: which statement is NOT true?
- A. Dark, matt surfaces are good absorbers and emitters of infrared radiation.
- B. Metals are good thermal conductors.
- C. Air trapped in materials makes good insulation.
- D. Cold flows into warm objects.
10
Question 10
Why are saucepans often made of metal with plastic handles?
- A. It is just for colour
- B. Metal is an insulator
- C. Metal is a good conductor; plastic is a good insulator
- D. Plastic conducts heat better than metal
11
Question 11
Which kind of energy transfer is this: an infrared heater warming you?
- A. conduction
- B. convection
- C. radiation
12
Question 12
Heat transfer: which statement is NOT true?
- A. Metals are good thermal conductors.
- B. Convection cannot happen in solids.
- C. Radiation needs particles to travel.
- D. Dark, matt surfaces are good absorbers and emitters of infrared radiation.
13
Question 13
Why are saucepans often made of metal with plastic handles?
- A. Plastic conducts heat better than metal
- B. It is just for colour
- C. Metal is an insulator
- D. Metal is a good conductor; plastic is a good insulator
14
Question 14
Which kind of energy transfer is this: a hot-air balloon rising?
- A. conduction
- B. convection
- C. radiation
15
Question 15
Heat transfer: which statement is NOT true?
- A. Coats make heat.
- B. Convection cannot happen in solids.
- C. Metals are good thermal conductors.
- D. Dark, matt surfaces are good absorbers and emitters of infrared radiation.
16
Question 16
Why does a thermos flask (vacuum flask) keep drinks hot?
- A. The vacuum stops conduction and convection; shiny walls reduce radiation
- B. It contains a heater
- C. It traps cold out by magic
- D. Plastic makes heat

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