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CBSE · Class 7 · Science

Heat Transfer in Nature

Standard difficulty · 20 questions · 40 marks

Name: Date: Score: ____ / 40

Show your working for Sections B and C. Answers are on the last page — try every question first!

Section A — Choose the correct answer8 × 1 = 8 marks
1.
Heat moves through a solid mainly by:
  1. radiation
  2. evaporation
  3. convection
  4. conduction
2.
Which of these is a GOOD conductor of heat?
  1. aluminium
  2. wool
  3. porcelain
  4. air
3.
Which of these is a POOR conductor of heat?
  1. silver
  2. copper
  3. steel
  4. porcelain
4.
When the handle of an iron pan heats up, heat moves mainly by:
  1. radiation
  2. evaporation
  3. convection
  4. conduction
5.
Near the sea, which breeze blows in night?
  1. a land breeze, from the land to the sea
  2. a breeze straight up into the sky
  3. no breeze at all
  4. a breeze that blows only along the beach
6.
Pins are fixed with wax every 3 cm along a metal strip, starting 3 cm from the heated end. 10 pins have fallen. About how far along the strip has the heat reached?
  1. 33 cm
  2. 10 cm
  3. 13 cm
  4. 30 cm
7.
Soil and water both start at 26 °C in the sun. After 20 minutes the soil is 35 °C and the water 29 °C. How many degrees hotter is the soil?
  1. 3 °C
  2. 9 °C
  3. 6 °C
  4. 35 °C
8.
In 10 minutes, 120 mL of water passed through gravel, 110 mL through sand and 30 mL through clay. How much more passed through gravel than clay?
  1. 90 mL
  2. 150 mL
  3. 10 mL
  4. 80 mL
Section B — Short answer8 × 2 = 16 marks
9.
What is conduction? Give an example.
10.
Is each a "good" or "poor" conductor of heat? (a) aluminium (b) plastic
11.
Name the way heat moves (conduction, convection or radiation): (a) a hot utensil cools in the air around it (b) we feel warm sitting near a bonfire
12.
Near the sea, is there a "sea breeze" or a "land breeze" (a) in a sunny afternoon (b) at late morning?
13.
Soil in the sun was measured every 5 minutes: 30 °C, 34 °C, 38 °C, 41 °C, 45 °C. By how much did its temperature rise in 20 minutes?
14.
A recharge pit takes in 60 litres of rainwater every hour during rain. How much water goes into the ground in 5 hours of rain?
15.
Explain why: (a) hollow bricks in walls (b) coastal windows face the sea
16.
Tea was poured at 90 °C. After 10 minutes it was 77 °C in a clay cup and 62 °C in a steel tumbler. Which kept it hotter, and by how much? Why?
Section C — Word problems4 × 4 = 16 marks
17.
Describe an activity to show conduction in a metal strip.
18.
Soil and water were kept in the sun and their temperatures read every 5 minutes.
Soil: 27, 29, 33, 36, 39 °C
Water: 27, 27, 28, 28, 28 °C
(a) How much did each warm up? (b) Which heats faster? (c) Use this to explain why a sea breeze blows in the afternoon.
19.
200 mL of water was poured into gravel, sand and clay. In 10 minutes, 140 mL, 130 mL and 60 mL came out. (a) How much stayed in each? (b) Which lets water through fastest, and why? (c) Why does this matter for groundwater?
20.
Name the way heat moves in each and explain how the particles take part: (a) we feel warm sitting near a bonfire (b) a hot utensil cools in the air around it
AmbifulWorksheets
Practice that never repeats
CBSE · Class 7 · Science

Answer key

Heat Transfer in Nature · AW-7S-HTN-2026-V1 · For parents — fold back or tear off before handing the sheet to your child.

QAnswerWorking
1(d) conduction—
2(a) aluminium—
3(d) porcelain—
4(d) conduction—
5(a) a land breeze, from the land to the sea—
6(d) 30 cm10 × 3 = 30
7(c) 6 °C35 − 29 = 6
8(a) 90 mL120 − 30 = 90
9Heat passing from particle to particle in a solid, such as a metal spoon in hot tea getting hot.—
10(a) good (b) poor—
11(a) radiation (b) radiation—
12(a) sea breeze (b) sea breeze—
1315 °C45 − 30
14300 L60 × 5 = 300
15(a) trapped air is a poor conductor (b) to catch the cool sea breeze—
16the clay cup, by 15 °C: clay is a poorer conductor of heat77 − 62
17Stick pins with wax about 2 cm apart along a metal strip and heat one end. The pins fall one by one, starting from the heated end, as heat passes along the strip from particle to particle.—
18(a) Soil: 12 °C; water: 1 °C (b) Soil (land). (c) The land gets hotter than the sea, the air over it rises, and cooler air from the sea moves in to take its place.—
19(a) Gravel 60 mL, sand 70 mL, clay 140 mL (b) Gravel: the gaps between its pieces are biggest. (c) Water seeps through loose soil and gravel to refill groundwater in aquifers.—
20(a) radiation (b) radiation—