Friday, April 26, 2019

WBCS Polity and Constitution MCQs Prelims and Mains

General Science MCQs with Answers For UPSC, SSC, WBPSC Exams P6

Chemistry - 06

26. Which of the following property is common in Graphite a Diamond?
(A) Crystal structure
(B) Density
(C) Electrical conductivity
(D) Relative atomic weight.

Correct Answer: [B] Density.
27. In the manufacture of steel by open-hearth process cast iron used has no phosphorus but has manganese as an impurity. The furnace should have a lining of
(A) silica
(B) lime or magnesia
(C) magnesia
(D) lime.

Correct Answer: [A] silica.
28. An alloy contains 20% zinc, 45% nickel and rests aluminum. The total mass in gm of the alloy containing 105 gm of aluminum is
(A) 250
(B) 300
(C) 170
(D) 200.

Correct Answer: [B] 300.
29. A pair of compounds which cannot exist together in solution is
(A) Sodium bicarbonate and sodium carbonate
(B) Sodium carbonate and sodium soda
(C) Sodium bicarbonate and caustic soda
(D) Sodium bicarbonate and water.

Correct Answer: [C] Sodium bicarbonate and caustic soda.
30. How many gms of a dibasic acid (mol wt 200) should be present in 100 ml of its aqueous solution to give 0.1 (N) strength?
(A) 10gm
(B) 20 gm
(C) 2 gm
(D) 1 gm.

Correct Answer: [D] 1 gm..


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