Heat Transfer in Nature Class 7 MCQ
hardHeat Transfer in Nature Class 7 MCQ
Heat Transfer in Nature Class 7 MCQ
Question 1.
What is the main source of heat for the Earth?
(a) The Moon
(b) The Sun
(c) Stars
(d) Volcanoes
Answer:
(b) The Sun
Question 2.
Which process involves water changing from a liquid to a gas?
(a) Condensation
(b) Precipitation
(c) Evaporation
(d) Transpiration
Answer:
(c) Evaporation
Question 3.
What is the term for the continuous movement of water in nature?
(a) Water cycle
(b) Water flow
(c) Water evaporation
(d) Water condensation
Answer:
(a) Water cycle
Question 4.
During the day, which heats up faster, land or water?
(a) Water
(b) Land
(c) Both equally
(d) Neither of water nor the land
Answer:
(b) Land
Question 5.
What is the process called when water vapour cools and forms clouds?
(a) Evaporation
(b) Condensation
(c) Precipitation
(d) Transpiration
Answer:
(b) Condensation
Question 6.
Which of the following is a good conductor of heat?
(a) Wood
(b) Air
(c) Metal
(d) Wool
Answer:
(c) Metal
Question 7.
What keeps us warm in cold weather according to the textbook?
(a) Thick clothing
(b) Woollen fabric trapping air
(c) Heavy blankets
(d) Hot water bottles
Answer:
(b) Woollen fabric trapping air
Question 8.
What causes the movement of the coloured streak in heated water?
(a) Conduction
(b) Convection
(c) Radiation
(d) Evaporation
Answer:
(b) Convection
Question 9.
Which of the following is NOT a state of water mentioned in the textbook?
(a) Solid
(b) Liquid
(c) Gas
(d) Plasma
Answer:
(d) Plasma
Question 10.
What is the term for the process of water vapour rising and cooling to form precipitation?
(a) Evaporation
(b) Transpiration
(c) Condensation
(d) Precipitation
Answer:
(d) Precipitation
Case Study
I. The Role of the Sun in Heat Transfer
The Sun is the primary source of heat for the Earth, influencing various natural processes. Its energy drives the water cycle, which is essential for maintaining life. For instance, when sunlight heats water bodies, such as oceans and lakes, it causes evaporation. This transformation of water from liquid to gas results in water vapour rising into the atmosphere, where it plays a crucial role in weather patterns and precipitation.
Question 1.
What is the main source of heat for the Earth that drives the water cycle?
(a) The Moon
(b) The Sun
(c) Volcanoes
(d) The Earth's core
Answer:
(b) The Sun
Explanation: The Sun is the primary source of heat for the Earth, as stated in the textbook and the paragraph.
Question 2.
What process occurs when sunlight heats water in oceans and lakes, causing it to change from liquid to gas?
(a) Condensation
(b) Precipitation
(c) Evaporation
(d) Freezing
Answer:
(c) Evaporation
Explanation: When sunlight heats water, it evaporates, turning from a liquid into water vapour (gas).
Question 3.
The transformation of water from liquid to gas due to the Sun's heat is called.............
Answer:
Evaporation
Explanation: The Sun's energy causes water to evaporate from surfaces like oceans and lakes.
Question 4.
The continuous movement of water between the Earth's surface and the atmosphere, driven by the Sun's heat, is known as the.....
Answer:
water cycle
Explanation: The water cycle involves evaporation, condensation, and precipitation, all powered by the Sun.
Question 5.
The Sun's energy is not important for the process of evaporation in the water cycle. (True/False)
Answer:
False
Explanation: The Sun's energy is essential for evaporation, which is a key step in the water cycle.