Question 1

Which of the following best explains why you can walk barefoot on red-hot coals without burning your feet, as shown in the second image?

Accepted Answer

The coals are poor conductors of heat, so little energy is transferred to your feet.

Question 2

In the first image, one foot is on a tile floor and the other on a rug. Why does the tile feel colder than the rug, even if both are at the same temperature?

Accepted Answer

Tile is a better conductor of heat than the rug, so it draws heat from your foot faster.

Question 3

Which method of heat transfer is primarily responsible for the visible shimmer of air above a hot stove, as seen in the third image?

Accepted Answer

Convection

Question 4

In the fourth image, what process is illustrated by the arrows circulating in the air and water?

Accepted Answer

Convection currents

Question 5

A person holds their hand above steam coming from a pressure cooker, as in the fifth image. Why does the steam above the nozzle feel cool, even though the steam at the nozzle is very hot?

Accepted Answer

The steam cools by expansion and mixes with cooler air as it rises.

Question 6

Refer to the sixth and seventh images showing air circulation during day and night. What causes the direction of the air flow to change between day and night?

Accepted Answer

Uneven heating of land and water causes air to rise over warmer surfaces and sink over cooler ones.

Question 7

Which type of electromagnetic wave has the shortest wavelength, as shown in the electromagnetic spectrum diagram?

Accepted Answer

Gamma rays

Question 8

According to Newton's Law of Cooling, which equation best describes the rate of temperature change of an object?

Accepted Answer

$$ \frac{dT}{dt} = -k (T - T_{env}) $$

Question 9

Why does dirty snow melt faster than clean snow in sunlight, as discussed in the study materials?

Accepted Answer

Dirty snow absorbs more sunlight, increasing its temperature.

Question 10

Which of the following statements about radiation is correct?

Accepted Answer

All objects above absolute zero emit electromagnetic radiation.

Question 11

A black object left in the sun becomes hotter than a white object. Why?

Accepted Answer

A black object absorbs more radiant energy than a white object.

Question 12

Which of the following best describes the greenhouse effect, as illustrated in the greenhouse diagram?

Accepted Answer

Short-wavelength solar radiation enters, is absorbed, and re-emitted as long-wavelength radiation that is trapped.

Question 13

Which equation correctly relates the wavelength $$\lambda$$ and frequency $$f of $$electromagnetic waves?

Accepted Answer

$$ c = \lambda f $$

Question 14

Why does the Earth's surface lose energy to outer space primarily by radiation?

Accepted Answer

Because space is a vacuum and only radiation can transfer energy through a vacuum.

Question 15

Which of the following is a good insulator and why?

Accepted Answer

Wool, because it traps air and slows heat transfer.

Question 16

If a hot pizza is placed in the snow, what is its net energy status?

Accepted Answer

It is a net emitter of radiant energy.

Question 17

Which of the following best explains why the interior of a car gets very hot on a sunny day with the windows closed?

Accepted Answer

Short-wavelength sunlight enters, is absorbed, and re-emitted as long-wavelength radiation that cannot escape.

Question 18

Which of the following gases is primarily responsible for absorbing infrared radiation in the Earth's atmosphere?

Accepted Answer

Greenhouse gases such as carbon dioxide and water vapor

Question 19

A frozen food item will warm up faster in a warm room than in a cold room. Which law explains this?

Accepted Answer

Newton's Law of Cooling

Chapter 16: Heat Transfer – Conduction, Convection, Radiation, and the Greenhouse Effect

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