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1) Consider the following:
1. Carbon dioxide
2. Oxides of Nitrogen
3. Oxides of Sulphur
Which of the above is/are the emission/emissions from coal combustion at thermal power plants?
A. 1 only
B. 2 and 3 only
C. 1 and 3 only
D. 1, 2 and 3
Answer : D.

2) Consider the following:
1. Oxides of Hydrogen
2. Oxides of Nitrogen
3. Oxides of Sulphur
Which of the above causes/cause acid rain?
A. 1 and 2 only
B. 3 only
C. 2 and 3 only
D. 1, 2 and 3
Answer : C.

3) Defect of colour blindness can be remedied by the use of
A. Concave lens
B. Convex lens
C. Cylindrical lens
D. None of the above
Answer : D.

4) Deficiency of iron leads to
A. Anorexia
B. Anaemia
C. Polycythemia
D. Leucopenia
Answer : B.

5) Given below are the names of four energy crops. Which one of them can be cultivated for ethanol?
A. Jatropha
B. Maize
C. Pongania
D. Sunflower
Answer : B.

6) If a tropical rain forest is removed, it does not regenerate quickly as compared to a tropical deciduous forest. This is because
A. The soil of rain forest is deficient in nutrients
B. Propagules of the trees in a rain forest have poor viability
C. The rain forest species are slow growing
D. Exotic species invade the fertile soil of rain forest
Answer : A.

7) Radioactivity is measured by
A. Geiger-Muller counter
B. Polarimeter
C. Calorimeter
D. Colorimeter
Answer : A.

8) Regular intake of fresh fruits and vegetables is recommended in the diet since they are a good source of antioxidants. How do antioxidants help a person maintain health and promote longevity?
A. They activate the enzymes necessary for vitamin synthesis in the body and help prevent vitamin deficiency
B. They prevent excessive oxidation of carbohydrates, fats and proteins in the body and help avoid unnecessary wastage of energy
C. They neutralize the free radicals produced in the body during metabolism
D. They activate certain genes in the cells of the body and help delay the ageing
Answer : C.

9) Satellites used for telecommunication relay are kept in a geostationary orbit. A satellite is said to be in such an orbit when:
1. The orbit is geosynchronous.
2. The orbit is circular.
3. The orbit lies in the plane of the Earth’s equator.
4. The orbit is at an altitude of 22,236 km.
Select the correct answer using the codes given below:
A. 1, 2 and 3 only
B. 1, 3 and 4 only
C. 2 and 4 only
D. 1, 2, 3 and 4
Answer : A.

10) The 2004 Tsunami made people realize that mangroves can serve as a reliable safety hedge against coastal calamities. How do mangroves function as a safety hedge?
A. The mangrove swamps separate the human settlements from the sea by a wide zone in which people neither live not venture out
B. The mangroves provide both food and medicines which people are in need of after any natural disaster.
C. The mangrove trees are tall with dense canopies and serve as an excellent shelter during a cyclone or tsunami
D. The mangrove trees do not get uprooted by storms and tides because of their extensive roots
Answer : D.