Heat and Energy Exe-6A Very Short Answer Physics Class-9 ICSE Selina Publishers. There is the solutions of Very short Answer type Questions of your latest textbook which is applicable in 2023-24 academic session. Visit official Website CISCE for detail information about ICSE Board Class-9
Heat and Energy Exe-6A Very Short Answer Type
Physics Class-9 ICSE Selina Publishers
| Board | ICSE |
| Class | 9 |
| Subject | Physics |
| Writer / Publication | Concise selina Publishers |
| Chapter-6 | Heat and Energy |
| Exe-6A | Heat and Temperature |
| Topics | Solution of Exe-6(A) Very Short Answer Type |
| Academic Session | 2024-2025 |
Exercise- 6A Heat and Temperature
page -145
Very Short Answer :
Q1- What is heat? Write its S.I. unit.
Ans- Heat is a form of energy that is transferred between two bodies at two different temperatures when kept in contact. Its S.I. unit is joule (J).
Q2- Two bodies at different temperatures are placed in contact. State the direction in which heat will flow.
Ans- When two bodies at different temperatures are placed in contact with each other, then heat flows from the body at higher temperature to the body at lower temperature.
Q3- Name the S.I. unit of heat. How is it related to the unit calorie?
Ans- The S.I. unit of heat is joule (J).
1 J = 0.24 cal
1 cal is 4.2 J
Q4- Define temperature and write its S.I. unit.
Ans- Temperature is a quantity which determines the direction of flow of heat on keeping two bodies in contact at different temperatures. Its SI unit is Kelvin (K).
Q5- Why does a piece of ice when touched with hand, appear cool? Explain.
Ans- When we touch a piece of ice, heat flows from our hand from high temperature to the ice at lower temperature and hence, we feel cool.
Q6- Name two substance which expand on heating.
Ans- Brass and Iron.
Q7- Name two substance which contract on heating.
Ans- Water and Silver Iodine
Q8- What do you mean by anomalous expansion of water?
Ans- Expansion of water on cooling from 4°C to 0°C.
Q9- At what temperature the density of water is maximum? State its value.
Ans- Density of water is maximum at 4°C. Its value is 1000 kgm-3.
Q10- Deep pond of water its top layer frozen during winter. State the expected temperature of water layer
(i) just in contact with ice, (ii) at the bottom pond.
Ans- (i) water just in contact with ice is at 0°C.
(ii) Water at the bottom of bond is at 4°C.
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