Conduction, Convection & Radiation — Practice · Grade 6 Science

Chapter: Energy, Heat & Thermal Design

What this practice covers

By the end of Conduction, Convection & Radiation you should be able to:

8 questions, written answer and multiple choice, each with a worked explanation.

Vocabulary used: convection, radiation, evidence, system boundary, uncertainty.

Problem 1

Did metal have to move along the handle?
Answer and explanation

No. Energy transfers through interactions within the material; bulk transport of the handle is not required.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 2

How is convection different from conduction?
Answer and explanation

Convection includes bulk fluid motion carrying energy. Conduction transfers energy through local interactions without that bulk motion.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 3

Why can sunlight transfer energy through space?
Answer and explanation

Radiation does not require a material medium between source and receiver.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 4

Does insulation prove no heat transfer occurs?
Answer and explanation

No. It can reduce transfer rates under the stated design while other pathways and imperfections remain.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 5

Develop a complete response: Explain all three pathways and what a fitted sleeve might change. Include relevant evidence and one method or model limit.
Answer and explanation

Conduction transfers energy through the wall; moving air can carry energy by convection; infrared radiation exchanges energy with surroundings. A sleeve can reduce some transfer through the wall and alter airflow, depending on its design. It does not guarantee zero cooling or prevent radiation by definition.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 6

Apply the unit independently: An object is warmed from the side by radiation. Must the energy move upward? Give a reason and a relevant qualification.
Answer and explanation

No. Radiation can travel in many directions. Rising warm fluid is a separate situation involving convection and buoyancy.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 7

Which statement correctly uses convection in Conduction, Convection & Radiation?
  1. All heat always rises regardless of the transfer mechanism.
  2. convection: Energy transport associated with bulk motion of a liquid or gas.
  3. Radiation requires air or water between source and receiver.
  4. One illustrative result establishes every real condition and needs no further evidence.
Answer and explanation

convection: Energy transport associated with bulk motion of a liquid or gas.

Energy transport associated with bulk motion of a liquid or gas. Conduction transfers energy through the wall; moving air can carry energy by convection; infrared radiation exchanges energy with surroundings. A sleeve can reduce some transfer through the wall and alter airflow, depending on its design. It does not guarantee zero cooling or prevent radiation by definition.

Problem 8

Which statement correctly uses radiation in Conduction, Convection & Radiation?
  1. Radiation requires air or water between source and receiver.
  2. All heat always rises regardless of the transfer mechanism.
  3. radiation: Energy transfer by electromagnetic waves, which can cross empty space.
  4. One illustrative result establishes every real condition and needs no further evidence.
Answer and explanation

radiation: Energy transfer by electromagnetic waves, which can cross empty space.

Energy transfer by electromagnetic waves, which can cross empty space. Conduction transfers energy through the wall; moving air can carry energy by convection; infrared radiation exchanges energy with surroundings. A sleeve can reduce some transfer through the wall and alter airflow, depending on its design. It does not guarantee zero cooling or prevent radiation by definition.

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