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Combustion and Flame
Give reasons: (a) Water is not used to control fires involving electr...

Give reasons: (a) Water is not used to | Class 8 Science Chapter Combustion and Flame, Combustion and Flame NCERT Solutions

Welcome to the NCERT Solutions for Class 8 Science - Chapter Combustion and Flame. This page offers a step-by-step solution to the specific question from Exercise 1, Question 5: . With detailed answers and explanations for each chapter, students can strengthen their understanding and prepare confidently for exams. Ideal for CBSE and other board students, this resource will simplify your study experience.

Question 5:

Give reasons:
(a) Water is not used to control fires involving electrical equipment.
(b) LPG is a better domestic fuel than wood.
(c) Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not.

Answer:

Water is not used to control fires involving electrical equipments because water is the conductor of electricity. It produces ions in the presence of electricity. So, water is not used to control the fire involving electrical equipments.
LPG is a better domestic fuel than wood because LPG is a clean fuel. It does not produce any harmful gas behind burning. It is easy to burn whereas wood produces ash and it does not burns easily.
Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminum pipe does not after the wrapping. Around an aluminum pipe its ignition temperature does not reach as the heat is transferred to the aluminum pipe; and the temperature of the paper lowers down.

Other Questions of Chapter Combustion and Flame

Explain how the use of CNG in automobiles has reduced pollution in our cities.

Name the unit in which the calorific value of a fuel is expressed.

Can the process of rusting be called combustion? Discuss.

Which zone of a flame does a goldsmith use for melting gold and silver and why?

In an experiment 4.5 kg of a fuel was completely burnt. The heat produced was measured to be 180,000 kJ. Calculate the calorific value of the fuel.

Make a labelled diagram of a candle flame.

It is difficult to burn a heap of green leaves but dry leaves catch fire easily. Explain.

Compare LPG and wood as fuels.

Explain how CO₂ is able to control fires.

List conditions under which combustion can take place.

Popular questions of class 8 Science

Describe with the help of a diagram an instrument which can be used to detect a charged body.

Sketch larynx and explain its function in your own words.

Arrange the following boxes in proper order to make a flow chart of sugarcane crop production.

What is metamorphosis? Give examples.

The following Table shows the total power shortage in India from 1991– 1997. Show the data in the form of a graph. Plot shortage percentage for the years on the Y-axis and the year on the X-axis.

Describe the construction of a kaleidoscope.

Make sketches of animal and plant cells. State three differences between them.

What is a constellation? Name any two constellations.

Complete the crossword with the help of clues given below:
Across
1. This is necessary for photosynthesis.
3. Term for component present in the cytoplasm.
6. The living substance in the cell.
8. Units of inheritance present on the chromosomes.

Down
1. Green plastids.
2. Formed by collection of tissues.
4. It separates the contents of the cell from the surrounding medium.
5. Empty structure in the cytoplasm.
7. A group of cells.

Make a sketch of the human nerve cell. What function do nerve cells perform?

Recently Viewed Questions of Class 8 Science

How are babies produced through IVF technique? What are such babies called?

What is menstruation? Explain.

Do all the stars in the sky move? Explain.

Should the handle and bristles of a tooth brush be made of the same material? Explain your answer.

Suggest three measures to protect ourselves from lightning.

Fill in the blanks:

(a) Microorganisms can be seen with the help of a ____________.
(b) Blue green algae fix __________ directly from air to enhance fertility of soil.
(c) Alcohol is produced with the help of __________.
(d) Cholera is caused by __________.

Explain why a charged balloon is repelled by another charged balloon whereas an uncharged balloon is attracted by another charged balloon?

‘Avoid plastics as far as possible’. Comment on this advice.

Select the correct word from the following list and fill in the blanks.
float, water, crop, nutrients, preparation

(a) The same kind of plants grown and cultivated on a large scale at a place is called _____________.
(b) The first step before growing crops is _____________ of the soil.
(c) Damaged seeds would _____________ on top of water.
(d) For growing a crop, sufficient sunlight and _____________ and _____________ from the soil are essential.

A blacksmith hammers a hot piece of iron while making a tool. How does the force due to hammering affect the piece of iron?

Study Tips for Answering NCERT Questions:

NCERT questions are designed to test your understanding of the concepts and theories discussed in the chapter. Here are some tips to help you answer NCERT questions effectively:

Read the question carefully and focus on the core concept being asked.
Reference examples and data from the chapter when answering questions about Combustion and Flame.
Review previous year question papers to get an idea of how such questions may be framed in exams.
Practice answering questions within the time limit to improve your speed and accuracy.
Discuss your answers with your teachers or peers to get feedback and improve your understanding.

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