Coal-fired power plants release sulphur dioxide and oxides of nitrogen into the environment.
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 32. An alloy of zinc, tin and copper contains 90% of copper, 7% of zinc and 3% of tin. A second alloy of copper and tin only is melted with the first, and the mixture contains 85% of copper, 5% of zinc and 10% of tin. Find the percentage of tin in the second alloy.(a) 27.5%(b) 55%(c) 22.5%(d) 45%
3. Consider the following pairs:
Rivers
Flows into
1. Mekong
Andaman Sea
2. Thames
Irish Sea
3. Volga
Caspian Sea
4. Zambezi
Indian Ocean
Which of the pairs given above is/are correctly matched?(a) 1 and 2 only(b) 3 only(c) 3 and 4 only(d) 1, 2 and 4 only4. Four pipes P, Q, R and S can fill a cistern in 20, 25, 40 and 50 hours respectively. The first pipe P was opened at 6:00 am, Q at 8:00 am, R at 9:00 am and S at 10:00 am. when will the Cistern be full?(a) 3:09 pm(b) 4:18 pm (c) 11:09 am(d) 12:15 pm 5. Steel slag can be the material for which of the following?
Construction of base road
Improvement of agricultural soil
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 3ANSWERS1. (d) 2. (a) 3. (c) Mekong flows through many countries: China, Burma, Thailand, Laos, Cambodia, and finally Vietnam. The Mekong begins in the Lasagongma Spring which is in the plateaus of Tibet, disputed part of China, and flows about 2,703 miles (4,350 km) south-east to the South China Sea. Thames river flows into North sea.4. (a) 5. (d)
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