Specific Heat Capacity and Latent Heat

# Class 10 Physics Chapter 11 Specific heat capacity and Latent heat Important Questions

The specific heat capacity of a substance is the amount of heat energy required to raise the temperature of one kilogram of the substance by one degree Celsius (or Kelvin). Latent heat is the amount of energy absorbed or released by a substance during a phase change without a change in temperature. Here you will find ICSE class 10 physics important questions chapter wise 2023-24.

## Introduction

Energy, in the form of heat, is a fundamental concept in thermodynamics. It influences how substances change their temperature and state. Two essential properties that dictate these behaviors in materials are the specific heat capacity and latent heat.The specific heat capacity of a substance defines the energy needed to raise the temperature of a unit mass of that substance by one degree Celsius. If you want to prepare well and clear your understanding then below are some important questions for class 10 ICSE physics.

## What are Specific heat capacity and Latent heat?

The specific heat capacity of a substance refers to the amount of heat energy required to raise the temperature of one kilogram of the substance by one degree Celsius (or Kelvin). It gives insight into the substance's ability to store thermal energy. Latent heat is the heat energy absorbed or released by a substance during a phase change, without any change in temperature. The word "latent" means "hidden", which alludes to the fact that during phase changes, heat energy goes into changing the state of the substance, rather than its temperature. If you want to practice more questions and clear your understanding, then oswal.io provides you with ICSE class 10 physics important questions.

### Class 10 Specific heat capacity and Latent heat Important Questions and Answers

#### (a) Water can extract more heat without raising its temperature significantly.(b) Water can lower its temperature without taking much heat from outside.(c) Specific heat capacity of water and radiators of cars are nearly same.(d) None of the above.

Ans. (a) Water can extract more heat without raising its temperature significantly.

Explanation:
When water passes through a pipe surrounded by a hot part of the engine, heat energy is removed from those parts. Because water has high specific heat capacity, water in pipes may extract more heat from the environment without significantly raising its temperature. As a result, the car’s radiator and generator are both filled with water.

#### (a) The material of the wire(b) The amount of current that flows through it (c) The direction of current flow (d) The resistance of the wire

Ans. (c) The direction of current flow
Explanation:
Regardless of the direction of current flow, the amount of heat produced in the transmission wire (in general, a current carrying conductor) is determined by the amount of current flowing through it and the resistance of the conductor.

#### Q3.  Does a substance absorb or liberate any heat energy during change of phase ?

Explanation:
Yes, heat is either absorbed or released during change of phase. Phase change, also known as a phase transition, refers to the transformation of matter from one state (or phase) to another, such as from solid to liquid or liquid to gas. These transitions require or release energy, and this energy is typically in the form of heat. The heat associated with a phase change is called latent heat.

#### Q4. Specific heat capacity of substance A is 3.8 J g–1 K–1 whereas the specific heat capacity of substance B is 0.4 J g –1 K–1. Which of the two is a good conductor of heat ? How is one led to this conclusion ?

Explanation:
‘B’ is a good conductor of heat, because for the same heat energy and same mass, the rise in temperature of B will be more. Hence, ‘B’ is a good conductor of heat.

#### Q5. Why does the heat supplied to a substance during its change of state not cause any rise in its temperature ?

Explanation:
During the state change heat supplied increases potential energy of molecules. As distance between molecules increases, work is done by heat supplied against attractive force.

#### ICSE Class 10 Physics Chapter wise Important Questions

Chapter No. Chapter Name
Chapter 1 Force Work Power and Energy
Chapter 2 Simple Machines
Chapter 3 Refraction of Light
Chapter 4 Refraction Through Lenses
Chapter 5 Spectrum
Chapter 6 Vibrations of Sound
Chapter 7 Sound
Chapter 8 Electricity
Chapter 9 Electrical Power and Household Circuits
Chapter 10 Magnetic Effect of Current
Chapter 11 Specific Heat Capacity and Latent Heat
Chapter 12 Radioactivity and Nuclear Energy

#### Conclusion

Heat transfer and energy interactions underlie many physical processes we observe daily. Two central concepts, specific heat capacity and latent heat, play pivotal roles in understanding these processes. The specific heat capacity describes how substances absorb or release heat during temperature changes, effectively gauging their thermal responsiveness. If you seek additional practice and a deeper comprehension of the topics covered in the chapter, oswal.io offers an extensive array of class 10 Specific heat capacity and Latent heat important questions and answers to facilitate a more profound understanding of the concepts.

#### Q1 : What is specific heat capacity?

Ans: Specific heat capacity is the amount of heat required to raise the temperature of one kilogram of a substance by one degree Celsius without any change of state.

#### Q2 : How is latent heat different from specific heat capacity?

Ans: While specific heat capacity deals with heat changes that result in temperature variations without a phase change, latent heat is concerned with heat changes during phase transitions without a temperature change.

#### Q3 : Why doesn’t the temperature change during a phase transition even though heat is being added or removed?

Ans: During phase transitions, the added or removed heat is used to break or form molecular bonds respectively. This energy is "hidden" in the process, hence termed "latent heat", and doesn't contribute to a temperature change.

#### Q4 : What units are used for specific heat capacity and latent heat?

Ans: Specific heat capacity is usually measured in J/(kg·K) or J/(kg·°C). Latent heat is typically given in J/kg.

#### Q5 : Why do different substances have different specific heat capacities?

Ans: The specific heat capacity of a substance depends on its molecular structure and the type of bonds between its atoms and molecules. Different substances have varying abilities to store and transfer heat.

## Chapter Wise  Important Questions for ICSE Board Class 10 Physics

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