3.2 Text Questions :
I. Answer the following questions :
1. Name any three common minerals used by you every day.
Ans: Three commons minerals used by us in day – to-day life are copper , iron and salt found usually in igneous and metamorphic rock formations .
2. What is an ore.Where are ores of metallic minerals generally located.
Ans : An ore is a rock from which minerals are mined. Ores of metallic minerals are
3. Name to regions rich in natural gas resources.
Ans: Two reasons rich in natural gas resources in India are : Jaisalmar and Krishna – Godavari delta.
4. Which sources of energy would you suggest for : a) rural areas, b) Coastal areas, c) Arid regions .
Ans :
(a) For rural areas : solar energy and wind energy are the good options . there are not many high rise building to act
as an obstacles for sunlight or to break the momentum of wind.
(b) For coastal areas : wind energy and tidal energy are good choices.
(c) For arid reasons : wind energy and solar energy are good.
5. Give five ways in which you can save energy at home.
Ans: Five ways in which one can save energy at home :
(a) Using of solar energy as much as possible .
(b) Using bio-gas as cooking fuel.
(c) Drying clothes in sunlight instead of washing machines.
(d) Avoiding misuse of electricity, switching off fans and lights when not required.
(e) Using pressure cooker for cooking.
II. Tick the correct answers :
i) Which one of the following is not a characterization of minerals.
a) They are created by natural processes c) They are inexhaustible √
b) They have a definite chemical composition d) Their distribution is uneven
ii) Which one of the following is not a producer of Mica.
a) Jharkhand c) Rajasthan
b) Karnataka √ d) Andhra Pradesh
iii) Which one of the following is a leading producer of copper in the world.
a) Bolivia c) Chile √
b) Ghana d) Zimbabwe
iv) Which one of the following practices will not conserve LPG in your kitchen.
a) Soaking the dal for some time before cooking it.
b) Cooking food in a pressure cooker .
c) Keeping the vegetables chopped before lightning the gas for cooking .
d) Cooking food in an open pan kept on low flame √ .
III. Give Reasons :
1. Environmental aspects must be carefully looked into before building huge dams.
Ans: Building huge dams causes destabilization of the natural habitats of plants and animals to living in the area. This environmental aspects should be looked into before building dams.
2. Most industries are concentrated around coal mines.
Ans: Presence of coal mines around industries reduces the cost of transportation and also ensures easy availability of fuel .
3. Petroleum is referred to as “Black Gold”.
Ans: Petroleum is a very valuable fossil fuel .it is used for running all machineries , transport vehicle, from a bicycle to an airplane.
4. Quarrying can become a major environmental concern.
Ans: After quarrying , pits are not covered so there may be environmental dangers which is a cause for concern .
IV. Distinguish between the followings:
i) Conventional and non-conventional sources of energy.
ii) Bio-gas and natural gas
iii) Ferrous and non-ferrous minerals
iv) Metallic minerals and non- metallic minerals
i) Ans :
| Conventional source of energy | Non-conventional sources of energy |
| 1. They have been in use for long time 2. Eg: Fossils fuels and firewood. |
1. They have come into use recently 2. Eg: Solar energy, tidal energy. |
ii) Ans :
| Bio-gas | Natural gas |
| 1. Bio-gas is obtained from the decomposition of organic waste. 2. It is a renewable source . 3. It is non-conventional source. |
1. Natural gas is obtained as a by-product in the extraction of petroleum . 2. It is a non-renewable source . 3. It is conventional source. |
iii) Ans :
| Ferrous minerals | Non-Ferrous minerals |
| 1. They contain iron. 2. They are magnetic . Eg: Iron |
1. They do not contain iron. 2. They are non-magnetic Eg: Copper |
iv) Ans :
| Metallic mineral | Non-Metallic mineral |
| 1. They contain metals in raw form. 2. Eg: Iron ore ,bauxite. |
1. They do not contain metals. 2. Eg: Limestone, gypsum . |