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![Selina solutions for Concise Physics [English] Class 9 ICSE chapter 6 - Heat and Energy - Shaalaa.com](/images/concise-physics-english-class-9-icse_6:8a0c4572dea049a29e575abe2d9ca662.jpg "Selina solutions for Concise Physics [English] Class 9 ICSE chapter 6 - Heat and Energy")
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Solutions for Chapter 6: Heat and Energy
Below listed, you can find solutions for Chapter 6 of CISCE Selina for Concise Physics [English] Class 9 ICSE.
Selina solutions for Concise Physics [English] Class 9 ICSE 6 Heat and Energy Exercise 6 (A) [Pages 129 - 130]
What is heat ? Write its S.I. unit.
Two bodies at different temperatures are placed in contact. State the direction in which the heat will flow.
Name the S.I. unit of heat and how is it related to the unit calorie?
Define temperature and write its S.I. unit.
Why does a piece of ice when touched with a hand, appear cool? Explain.
Distinguish between heat and temperature.
What do you understand by thermal expansion of a substance?
Name two substances which expand on heating.
Name two substances which contract on heating.
What do you mean by the anomalous expansion of water?
At what temperature is the density of water is maximum? State its value.
State the volume changes that you will observe when a given mass of water is heated from 0°C to 10°C. Sketch a temperature-volume graph to show the behaviour.
Draw a graph to show the variation in density of water with temperature in the range from 0°C to 10°C.
A given mass of water is cooled from 10°C to 0°C. State the volume changes you will observe. Represent these changes on a temperature-volume graph.
Describe an experiment to show that water has maximum density at 4°C. What important consequences follow this peculiar property of water? Discuss the importance of this phenomenon in nature.
A deep pond of water has its top layer frozen during winter. State the expected temperature of water layer (i) Just in contact with ice and (ii) At the bottom of pond.
Draw a diagram showing the temperature of various layers of water in an ice covered pond.
Explain the following
Water pipes in colder countries often burst in winter.
Explain the following
In winter, water tanks (or ocean) start freezing from the surface and not from the bottom.
Explain the following
Fishes survive in ponds even when the atmospheric temperature is well below 0°C.
Explain the following
A hollow glass sphere which floats with its entire volume submerged in water at 4°C, sinks when water is heated above 4°C.
Explain the following
A glass bottle completely filled with water and tightly closed at room temperature is likely to burst when kept in the freezer of a refrigerator.
Selina solutions for Concise Physics [English] Class 9 ICSE 6 Heat and Energy Exercise 6 (A) [Page 130]
Calorie is the unit of :
Heat
Work
Temperature
food
1 J equals to :
0.24 cal
4.18 cal
1 cal
1 kcal
S.I. unit of temperature is :
Cal
Joule
Celsius
kelvin
Water is cooled from 4 °C to 0 °C. It will :
contract
expand
first contract, then expand
first expand, then contract
Density of water is maximum at :
0°C
100°C
4°C
15°C
Selina solutions for Concise Physics [English] Class 9 ICSE 6 Heat and Energy Exercise 6 (B) [Page 132]
What is an ecosystem ? Name its two components .
What is the source of energy for all ecosystems?
State the importance of green plants in an ecosystem.
Differentiate between the producers and consumers.
State the functions of decomposers in an ecosystem.
What is a food chain?
Draw a simple diagram showing a food chain.
Describe the energy flow in an ecosystem.
State the law which governs the energy flow in an ecosystem.
Show that the energy flow in an ecosystem is linear.
Draw a simple diagram showing the energy flow in a food chain.
Draw a diagram to show that the energy flow in an ecosystem is governed by the law of conservation of energy.
Selina solutions for Concise Physics [English] Class 9 ICSE 6 Heat and Energy Exercise 6 (B) [Page 132]
Food chain begins with
Respiration
Photosynthesis
Decomposition
Decay
The source of energy in an ecosystem is
Sun
Decayed bodies
Green plants
Sugar
Energy enters in a food chain through
Primary consumers
Secondary consumers
Tertiary consumers
Producers
The place of human being in food chain in an ecosystem is as
Producer
Consumer
Decomposer
Both (a) and (b)
Selina solutions for Concise Physics [English] Class 9 ICSE 6 Heat and Energy Exercise 6 (C) [Page 141]
State two characteristics which a source of energy must have.
Name the two groups in which various sources of energy are classified. State on what basis are they classified.
What is meant by the renewable and non-renewable sources of energy? State two differences between them, giving two examples of each
Select the renewable and non-renewable sources of energy from the following :
- Coal
- Wood
- Water
- Diesel
- Wind
- Oil
Why is the use of wood as a fuel not advisable although wood is a renewable source of energy?
Name five renewable and three non-renewable sources of energy.
What is tidal energy ? Explain in brief.
What is ocean energy? Explain in brief.
What is geothermal energy? Explain in brief.
What is the main source of energy for Earth?
What is solar energy? How is the solar energy used to generate electricity in a solar power Plant?
What is a solar cell? State two uses of solar cells. State whether a solar cell produces a.c. or dc. Give one disadvantage of using a solar cell.
State two advantages and two limitations of producing electricity from solar energy.
What is wind energy? How is wind energy used to produce electricity? How much electric power is generated in India using the wind energy?
State two advantages and two limitations of using wind energy for generating electricity.
What is hydro energy? Explain the principle of generating electricity from hydro energy. How much hydro electric power is generated in India?
State two advantages and two disadvantages of producing hydro electricity.
What is nuclear energy? Name the process used for producing electricity using the nuclear energy.
What percentage of total electrical power generated in India is obtained from nuclear power plants? Name two places in India where electricity is generated from nuclear power plants.
State two advantages and two disadvantages of using nuclear energy for producing electricity.
State the energy transformation in the following:
electricity is obtained from solar energy.
State the energy transformation in the following:
electricity is obtained from wind energy.
State the energy transformation in the following:
electricity is obtained from hydro energy.
State the energy transformation in the following:
electricity is obtained from nuclear energy.
State four ways for the judicious use of energy.
What do you mean by degradation of energy? Explain it by taking two examples of your daily life.
The conversion of part of energy into a unuseful form of energy is called ___________
Selina solutions for Concise Physics [English] Class 9 ICSE 6 Heat and Energy Exercise 6 (C) [Page 141]
The ultimate source of energy is :
wood
wind
water
sun
Renewable source of energy is :
coal
fossil fuels
natural gas
sun
Selina solutions for Concise Physics [English] Class 9 ICSE 6 Heat and Energy Exercise 6 (D) [Pages 145 - 146]
What do you mean by greenhouse effect?
Name three green house gases.
Which of the following solar radiations pass through the atmosphere of Earth: X -rays, ultraviolet rays, visible light rays or infrared radiation?
What results in the increase of carbon dioxide contents of earth's atmosphere?
Name the radiations which are absorbed by the green house gases.
What would have been the temperature of earth's atmosphere in absence of green house gases in it?
State the effect of green house gases on the temperature of earth's atmosphere.
What do you mean by global warming?
What causes the rise in atmospheric temperature?
State the cause of increase of green house effect.
What will be the effect of global warming at the poles?
State the effect of global warming in coastal regions.
How will global warming affect the sea level?
How will global warming affect the agriculture?
State two ways to minimize the impact of global warming.
What is carbon tax? Who will pay it?
Selina solutions for Concise Physics [English] Class 9 ICSE 6 Heat and Energy Exercise 6 (D) [Page 146]
The green house gas is :
Oxygen
Nitrogen
Chlorine
Carbon dioxide
The increase of carbon dioxide gas in atmosphere will cause
Decrease in temperature
Increase in temperature
No change in temperature
increase in humidity.
Without green house effect, the average temperature of Earth's surface would have been :
-18°C
33°C
0°C
15°C
The global warming has resulted in :
the increase in yield of crops
the decrease in sea levels
the decrease in human deaths
the increase in sea levels
Solutions for 6: Heat and Energy
Selina solutions for Concise Physics [English] Class 9 ICSE chapter 6 - Heat and Energy
Shaalaa.com has the CISCE Mathematics Concise Physics [English] Class 9 ICSE CISCE solutions in a manner that help students grasp basic concepts better and faster. The detailed, step-by-step solutions will help you understand the concepts better and clarify any confusion. Selina solutions for Mathematics Concise Physics [English] Class 9 ICSE CISCE 6 (Heat and Energy) include all questions with answers and detailed explanations. This will clear students' doubts about questions and improve their application skills while preparing for board exams.
Further, we at Shaalaa.com provide such solutions so students can prepare for written exams. Selina textbook solutions can be a core help for self-study and provide excellent self-help guidance for students.
Concepts covered in Concise Physics [English] Class 9 ICSE chapter 6 Heat and Energy are Expansion of Solids, Anomalous Behaviour of Water, Consequences of Anomalous Expansion of Water, Concept of Energy Flow in an Ecosystem, Application of Laws of Thermodynamics in Energy Flow, Conventional energy resources or non-renewable energy resources, Solar Energy, Solar Energy Devices, Hydroelectric Energy, Bio-energy, Anomalous Expansion of Water, Source of Energy, Wind Energy, Energy from the Sea, Heat and Its Unit, The Temperature and a Thermometer, Expansion of Substances (Thermal Expansion), Geothermal Energy, Nuclear Energy, Conservation of Coal, Petroleum, and Natural Resources, Energy Degradation, Protecting our environment, Green House Effect, Preventive Measures of Green House Effect, Global Warming, Preventive Measures of Global Warming, Future Predictions of Global Warming, Expansion of Liquids, Expansion of Gases.
Using Selina Concise Physics [English] Class 9 ICSE solutions Heat and Energy exercise by students is an easy way to prepare for the exams, as they involve solutions arranged chapter-wise and also page-wise. The questions involved in Selina Solutions are essential questions that can be asked in the final exam. Maximum CISCE Concise Physics [English] Class 9 ICSE students prefer Selina Textbook Solutions to score more in exams.
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