Natural Science Quiz Questions and Answers for Competitive Exams
General Science MCQ Questions: 2020
33. Normal valency of nitrogen is
A. 2
B. 3
C. 4
D. 5
Ans . B
34. The isotope atoms differ in
A. atomic number
B. number of protons
C. number of electrons
D. atomic weight
Ans . D
35. Nucleus of an atom contains
A. electrons
B. protons
C. electrons and protons
D. protons and neutrons
Ans . D
36. Which one of the following does not contain silver?
A. Horn silver
B. Ruby silver
C. German silver
D. Lunar caustic
Ans . C
37. Nail polish remover contains
A. acetone
B. benzene
C. acetic acid
D. petroleum ether
Ans . A
38. What is a mixture of potassium nitrate powdered charcoal and sulphur called?
A. paint
B. glass
C. gun powder
D. cement
Ans . C
39. Which is the heaviest metal?
A. iron
B. mercury
C. nickel
D. osmium
Ans . D
40. Bleaching action of chlorine is by
A. oxidation
B. reduction
C. decomposition
D. hydrolysis
Ans . C
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Rajesh Bhatia
A Writer, Teacher and GK Expert. I am an M.A. & M.Ed. in English Literature and Political Science. I am highly keen and passionate about reading Indian History. Also, I like to mentor students about how to prepare for a competitive examination. Share your concerns with me by comment box. Also, you can ask anything at linkedin.com/in/rajesh-bhatia-7395a015b/.
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