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# Solutions of Sources of Energy (Page No- 132) - Physics By Lakhmir Singh, Class 10 Class 10 Notes | EduRev

## Class 10 Physics Solutions By Lakhmir Singh & Manjit Kaur

Created by: Ajay Batra

## Class 10 : Solutions of Sources of Energy (Page No- 132) - Physics By Lakhmir Singh, Class 10 Class 10 Notes | EduRev

The document Solutions of Sources of Energy (Page No- 132) - Physics By Lakhmir Singh, Class 10 Class 10 Notes | EduRev is a part of the Class 10 Course Class 10 Physics Solutions By Lakhmir Singh & Manjit Kaur.
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Lakhmir Singh Physics Class 10 Solutions Page No:132

Question 37: Fossil fuels are energy rich compounds of an element X which were originally made by the plants with the help of sunâ€™s energy.
(a) Name the element X.
(b) Name another element which is usually found in combination with X in fossil fuels.

Solution : (a) X = Carbon
(b) Another element which is usually found in combination with carbon in fossil fuels is hydrogen.

Question 38: The energy in petrol originally came from the sun. Explain how it got into petrol.

Solution : Petrol is obtained from petroleum, which is a fossil fuel. Fossil fuels were originally made by sunâ€™s energy because it was the sunlight of long ago that made plants and animals grow. So, the energy in petrol originally came from the sun.

Question 39: A substance X is added to LPG cylinders while filling so as to make the detection of leakage of LPG from the cylinders easy.
(a) Name the substance X.
(b) How does substance X make the detection of leakage of LPG easy ?

Solution : (a) X is ethyl mercaptan
(b) Ethyl mercaptan has a foul smell that can be detected easily.

Question 40: The pollution of air caused by burning petroleum fuels (like petrol and diesel) in vehicles can be controlled by fitting a device X in the exhaust system of vehicles.
(a) Name the device X.
(b) How does this device help in controlling air pollution ?

Solution : (a) Catalytic converter
(b) It converts poisonous carbon monoxide into non-poisonous carbon dioxide and harmful nitrogen oxides into harmless nitrogen gas.

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