Chapter 14 Sources of Energy Question 1: What is a good source of energy? Answer: A good source of energy fulfils the following criteria: (I)It produces a lot of heat per unit mass. (II) It does a huge amount of work per unit mass. (III) It is easily accessible. (IV) It is easy to store and transport. (V)It is economical. (VI)It produces less amount of smoke. Question 2: What is a good fuel? Answer: A good fuel produces a huge amount of heat on burning, does not produce a lot of smoke, and is easily available. Question 3: If you could use any source of energy for heating your food, which one would you use and why? Answer: Natural gas can be used for heating and cooking food because it is a clean source of energy. It does not produce huge amount of smoke on burning. Although it is highly inflammable, it is easy to use, transport, and it produces a huge amount of heat on burning. ...
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Class–X (Our Environment) Questions 1. Why are some substances biodegradable and some non-biodegradable? 2. Give any two ways in which biodegradable substances would affect the environment. 3. Give any two ways in which non-biodegradable substances would affect the environment. Class–X (Our Environment) Answers 1. Substances which can be acted upon by microorganism (decomposer) are called biodegradable. For example- vegetable wastes, paper, cotton etc. On the other hand, materials which are not acted upon by decomposers are called non-b...
Chapter-16 Management of Natural Resources Question 1: What changes can you make in your habits to become more environment-friendly? Answer: We should switch off the electrical appliances when not in use. Water and food should not be wasted. Close the tap when not in use. Dump the objects made of plastic and glass in designated recycling boxes. Plastic, paper, or glass must be recycled or reused and not dumped with other wastes. This is because objects made of plastic do not get decomposed easily. Besides soil fertility, they badly affect our environment. We should dispose the wastes safely and not disperse in public places. These are a few things that can be done to become more environment- friendly. Question 2: What would be the advantages of exploiting resources with short-term aims? Answer: There should be a judicious use of natural resources as they are limited in nature. We should not exploit resources for our short ...