21. Steel slag can be the material for which of the following?
1. Construction of base road
2. Improvement of agricultural soil
3. Production of cement
Select the correct answer using the code given below:
a) 1 and 2 only
b) 2 and 3 only
c) 1 and 3 only
d) 1, 2 and 3
Answer. D)
22. Which of the following are the most likely places to find the musk deer in its natural habitat?
1. Askot Wildlife Sanctuary
2. Gangotri National Park
3. Kishanpur Wildlife Sanctuary
4. Manas National Park
Select the correct answer using the code given below:
a) 1 and 2 only
b) 2 and 3 only
c) 3 and 4 only
d) 1 and 4 only
Answer. A)
23. In rural road construction, the use of which of the following is preferred for ensuring environmental sustainability or to reduce carbon footprint?
1. Copper slag
2. Cold mix asphalt technology
3. Geotextiles
4. Hot mix asphalt technology
5. Portland cement
Select the correct answer using the code given below:
a) 1, 2, and 3 only
b) 2, 3, and 4 only
c) 4 and 5 only
d) 1 and 5 only
Answer. A)
24. Consider the following statements:
1. Coal ash contains arsenic, lead, and mercury.
2. Coal-fired power plants release sulfur dioxide and oxides of nitrogen into the environment.
3. High ash content is observed in Indian coal.
Which of the statements given above is/are correct?
a) 1 only
b) 2 and 3 only
c) 3 only
d) 1, 2 and 3
Answer. D)
25. What is the use of biochar in farming?
1. Biochar can be used as a part of the growing medium in vertical farming.
2. When biochar is a part of the growing medium, it promotes the growth of nitrogen-fixing microorganisms.
3. When biochar is a part of the growing medium, it enables the growing medium to retain water for a longer time.
which of the statements given above is/are correct?
a) 1 and 2 only
b) 2 only
c) 1 and 3 only
d) 1, 2 and 3
Answer: D)
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