SEBA Class 7 Science Chapter 9 Transfer of Heat In Nature

SEBA Class 7 Science Chapter 9 Transfer of Heat In Nature Solutions English Medium As Per SCERT New Syllabus to each chapter is provided in the list so that you can easily browse through different chapters SEBA Class 7 Science Chapter 9 Transfer of Heat In Nature Notes and select need one. SEBA Class 7 Science Textual Notes Download PDF. SCERT Class 7 Science New Textbook Question Answer in English.

SEBA Class 7 Science Chapter 9 Transfer of Heat In Nature

Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. SCERT Class 7 Amar Bijnan (Science) Textual Solutions are part of All Subject Solutions. Here we have given SCERT Class 7 Amar Bijnan (Science) Question Answer for All Chapters, You can practice these here.

Transfer of Heat In Nature

Chapter: 9

PART – II

EXERCISES

1. State whether True or False:

(a) In solids, heat is transferred mainly through the process of convection. [T/F]

Ans: False.

(b) Air gets heated by the process of convection. [T/F

Ans: True.

(c) Radiation is a method of heat transfer that requires a medium. [T/F]

Ans: False.

(d) Water seeps through clay faster than through gravel. [T/F]

Ans: False.

(e) A sea breeze is the movement of cooler air from the sea towards the land during the day. [T/F]

Ans: True.

2. Darken the circle of the correct answer:

(i) A hot metal pan is removed from a flame and placed on a pan counter. It eventually cools down to room temperature. How does it primarily lose its heat?

(a) Through conduction.

(b) Through convection.

(c) Through radiation.

(d) Through a combination of conduction and convection.

Ans: (c) Through radiation.

(ii) What is the primary reason why water seeps much more slowly through clay than through gravel?

(a) Clay is found deeper underground than gravel.

(b) Gravel particles are smaller and remain packed together more tightly.

(c) The spaces between clay particles are much smaller and loosely bound.

(d) The chemical composition of clay repels water.

Ans: (c) The spaces between clay particles are much smaller and loosely bound.

(iii) Which of the following processes primarily transfer heat through a solid metal rod and water?

(a) Conduction and radiation.

(b) Convection and conduction.

(c) Radiation and conduction.

(d) Radiation and convection.

Ans: (b) Convection and conduction.

(iv) A pressure cooker is made of steel or aluminium, while its handle is made of plastic or wood. Why are different materials used?

(a) Steel or aluminium is a poor conductor of heat, and plastic is a good conductor.

(b) Steel or aluminium is a good conductor of heat, and plastic is a poor conductor.

(c) Steel or aluminium transfers heat by convection, while plastic transfers heat by conduction.

(d) Steel or aluminium transfers heat by conduction, while plastic transfers heat by convection.

Ans: (b) Steel or aluminium is a good conductor of heat, and plastic is a poor conductor.

3. Read the following two statements carefully. One of them is given as the ‘Assertion and the other as the ‘Reason”.

Assertion: Sea breeze blows from the sea toward the land during day time

Reason: Land gets heated up faster than water under sunlight, so warm air over land rises and is replaced by cooler air from the sea.

Choose the correct answer from the available options:

(a) Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

(b) Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.

(c) Assertion is true, but Reason is false.

(d) Assertion is false, but Reason is true.

Ans: (a) Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

4. Fill up the blanks:

(a) The process of heat transfer from the hotter part of an object to a colder part without changing the position of its particles is called ___________.

Ans: Conduction.

(b) Materials that do not allow heat to pass through them easily are called __________ of heat.

Ans: Insulators.

(c) In liquids and gases, heat is transferred mainly by the process of ________________.

Ans: Convection.

(d) All kind of objects exchange heat with their surroundings through the process of _____________.

Ans: Radiation.

5. A stainless-steel spoon kept in a cup of hot water becomes hot within a few minutes. Explain how heat is transferred along the spoon and predict which part becomes hot first and which part gets heated up last? 

Ans: Heat Transfer in a Spoon Heat is transferred along the stainless-steel spoon through the process of conduction. In this process, particles at the hotter end (dipped in water) get heated and pass that heat to the particles next to them without moving from their own place.

Prediction: The part of the spoon dipped in the hot water becomes hot first, and the handle (the end outside the water) gets heated up last.