Friday, April 26, 2019

WBCS Polity and Constitution MCQs Prelims and Mains

Quiz on General Science (Chemistry) For WBCS Prelims Exams P3


Page 3

163321. Which of the following is a neutral oxide
A
Calcium oxide
B
Sulphur-di-Oxide
C
Nitric oxide
D
Zinc oxide
D
Correct Answer: D. Zinc oxide
163422. Which of the following mixtures can be separated by using separating funnel?
A
Water + oil
B
Petrol + kerosene
C
Water + sugar
D
Water + milk
A
Correct Answer: A. Water + oil
163523. Mg2+ is isoelectronic with
A
Zn2+
B
Cu+
C
Ca2+
D
Na+
D
Correct Answer: D. Na+
163624. The half-life of a substance is 10 days. How much of the substance will be left after 40 days if the initial mass is 2 gm
A
0.0125 gm
B
1.25 gm
C
0.125 gm
D
5 gm
C
Correct Answer: C. 0.125 gm
163725. Brass is an alloy of
A
Copper and Aluminium
B
Copper and Zinc
C
Iron and Copper
D
Copper and Tin
B
Correct Answer: B. Copper and Zinc
163826. Which of the following property is common in Graphite a Diamond?
A
Crystal structure
B
Density
C
Electrical conductivity
D
Relative atomic weight
B
Correct Answer: B. Density
163927. 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
A
Correct Answer: A. silica
164028. 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
B
Correct Answer: B. 300
164129. 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
C
Correct Answer: C. Sodium bicarbonate and caustic soda
164230. 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
D
Correct Answer: D. 1 gm



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