Practicing Class 7 Science MCQ and Class 7 Science Chapter 7 Heat Transfer in Nature MCQ Questions Online Test with Answers daily helps in time management.
Class 7 Heat Transfer in Nature MCQ with Answers
MCQ on Heat Transfer in Nature Class 7
Class 7 Science Chapter 7 Heat Transfer in Nature MCQ Questions with Answers
Question 1.
Which process is responsible for heat transfer in solids?
(a) Convection
(b) Radiation
(c) Conduction
(d) Evaporation
Answer:
(c) Conduction
Question 2.
Metals are good conductors of heat because:
(a) They have tightly packed particles.
(b) Their particles move freely.
(c) They allow heat to pass easily.
(d) They reflect sunlight.
Answer:
(c) They allow heat to pass easily.
Question 3.
Which material is a poor conductor of heat?
(a) Copper
(b) Iron
(c) Wood
(d) Aluminium
Answer:
(c) Wood
Question 4.
Heat transfer by the actual movement of liquid particles is called:
(a) Conduction
(b) Convection
(c) Radiation
(d) Evaporation
Answer:
(b) Convection
Question 5.
Why do we prefer wearing woollen clothes in winter?
(a) Wool reflects sunlight.
(b) Wool absorbs moisture.
(c) Wool traps air, reducing heat loss.
(d) Wool is heavier than cotton.
Answer:
(c) Wool traps air, reducing heat loss.
Heat Transfer in Nature Class 7 Assertion-Reason Type Questions
Assertion-Reason Directions: Each of the questions (i) and (ii) contain two statements – first ‘Assertion’ and second ‘Reason’. Select the correct answer to these question from the codes (a), (b), (c) or (d) as given below:
(a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
(b) Both Assertion and Reason are true and Reason is NOT the correct explanation of Assertion.
(c) Assertion is true and Reason is false.
(d) Assertion is false and Reason is true.
(i) Assertion (A): Metals are used for . making cooking utensils.
Reason (R): Metals are poor conductors of heat.
Answer:
(c) Assertion is true and Reason is false.
Explanation:
Metals are good conductors, not poor conductors.
(ii) Assertion (A): Rainwater har-vesting is becoming difficult with more and more concrete areas coming up in place of vegetation on soil.
Reason (R): Infiltration is possible through clay, sand or gravel.
Answer:
(a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
Explanation:
Both assertion and reason are true, and the reason correctly explains infiltration.
Heat Transfer in Nature Class 7 Fill in the blanks
1. Materials that allow heat to pass through them easily are called ________ conductors.
Answer:
Good
2. In ________, heat is transferred by the actual movement of particles.
Answer:
Convection
3. During the day, the cooler air moves from the ________ to the ________, creating a sea breeze.
Answer:
Sea, land
4. Heat from the Sun reaches Earth mainly through ________.
Answer:
Radiation
5. ________ surfaces absorb more heat, while ________ surfaces reflect more heat.
Answer:
Dark, light
Heat Transfer in Nature Class 7 True or False
Question 1.
A bukhari is a traditional room heater that also uses all three modes of heat transfer.
Answer:
True
Question 2.
In the water cycle, evaporation happens because of the Sun’s heat.
Answer:
True
Question 3.
The heat from a fire reaches us mainly by conduction.
Answer:
False
Explanation:
Heat from a fire reaches us mainly by radiation, not conduction.
Question 4.
In a coastal area, during the night, wind blows from land to sea.
Answer:
True
Question 5.
Aquifers are layers of rocks that store groundwater.
Answer:
True
Heat Transfer in Nature Class 7 Match the following
Question 1.
Match the following items given in Column A with that in Column B:
| Column A | Column B |
| (a) Woollen clothes | (i) Air from sea to land during day |
| (b) Hollow bricks | (ii) Trap air to keep us warm |
| (c) Sea breeze | (iii) Air from land to sea at night |
| (d) Land breeze | (iv) Trap air to insulate walls |
Answer:
| Column A | Column B |
| (a) Woollen clothes | (ii) Trap air to keep us warm |
| (b) Hollow bricks | (iv) Trap air to insulate walls |
| (c) Sea breeze | (i) Air from sea to land during day |
| (d) Land breeze | (iii) Air from land to sea at night |