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Give reasons :

LPG is a better domestic fuel than wood.


LPG has more calorific value and produces no pollution. Hence, it is better domestic fuel than wood.

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Compare LPG and wood as fuels.


LPG

Wood

1. It has more calorific value i.e. 55000 kJ/ kg.

1. It has less calorific value i.e. 17000 to 22000.

2. It is smoke free fuel.

2. It gives out lot of smoke which is quite dangerous.

3. It is easy to transport.

3. It is difficult to transport wood.

4. It is easily stored in cylinders.

4. It is difficult to store as it needs of space to store.

5. It does not cause any environment problem.

5. It is cut so lead to deforestation thus gives rise to many natural and environmental problem.

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Give reasons :

Water is not used to control the fire involving electrical equipment.


Water is a conductor of electricity, so it can easily conduct electric current and causes danger of electric shocks.

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


CNG has replaced petrol and diesel as fuel in automobiles because petrol and diesel produced a lot of unburnt carbon particles and emitted carbon dioxide and nitrogen oxides and sulphur dioxide. These all gases are poisonous gases and cause various environmental hazards. But CNG is safe because it produces these substances in very small amounts thus reducing pollution in cities.

404 Views

Give reasons :

Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not.


 The ignition temperature of paper is less, so it catches fire easily. It does not catch fire when wrapped around aluminium pipe because aluminium absorbs the heat, so paper does not attain its ignition temperature.

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