Short Answer Type Questions:
10.6 What is CNG and what r its main uses?
Ans: CNG means Compressed Natural Gas, it is mainly used as a fuel. The engines of the other automobiles can be easily modified to run on CNG. In case of CNG the cost is low, wear and tear of engine is low and the environmental pollution is also low.
10.7 Write all the steps of chemical reaction for the conversion of coke or coal to methanol.
Ans: The chemical process for the conversion of coke to methanol is as follows:
C + 2H 2 O -------- > CO 2 + 2H 2
C + H 2 O -------- > CO + H 2
CO + 2H 2 -------- > CH 3 OH
10.8 What is Photovoltaic Cell?
Ans: Photovoltaic energy conversion is a direct energy conversion in the sense that the light energy is directly converted into electrical energy without intermediate involvement of mechanical or thermal energy. Photovoltaic energy converters are generally known as Solar Cells.
10.9 Give examples of four non-metallic materials which can be recycled and can be reused.
Ans: 1) Paper, 2) Cow Dung, 3) Plastics, and 4) Glass.
10.10 What r uses of China Clay?
Ans: China clay is produced from Granite Rock for use in ceramic industries. About 80 –-90% of the extracted rock is spoil, which includes over burden, waste rock and coarse sand. The bulk of these materials is dumped. Coarse sand is used in road construction and in manufacture of building materials.
10.11 At the time of designing of a development project, care should be taken to preserve:
(a) Hills (b) Valleys
(c) Springs (d) All of these.
10.12 Barry commoner, in his famous book “ The closing circle”, formulated:
(a) Two laws of ecology (b) Four laws of ecology
(c) Three laws of ecology (d) No law of ecology
10.13 Sectors which r most vital for sustainable development of India are:
(a) Agriculture (b) Infrastructure
(c) Water (d) All
10.14 Match the following:
(a) Energy (D) Ozone depletion
(b) Geo-thermal Energy (C) Our common future
(c) Brundtland (A) Transport sector
(d) Montreal protocol (B) Cambay basin
10.15 Write true or false:
Nothing, in fact, is really a waste. (T)
10.16 write true or false:
Primary metal industries recover metals from municipal wastes. (T)
10.17 Name the odd one:
(a) Glass (b) Plastic
(c) Aluminium (d) Rubber
10.18 Name the odd one:
(a) Hydrogen (b) Methanol
(c) Coal (d) Iron
10.19 Fill in the blanks:
All natural features maintain ecological balance.
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