100 Science Questions and Answers for RRB NTPC
Which metal starts floating when put in water?
(A) calcium
(B) Nickel
(C) Magnesium
(D) Potassium
Correct Answer : A
Approximate pH value of lemon juice?
(A) 10
(B) 2.2
(C) 12
(D) 14
Correct Answer : B
Which metal does not react with oxygen even at higher temperatures?
(A) Iron
(B) Gold
(C) Potassium
(D) Aluminum
Correct Answer : B
With which substance is it beneficial to treat a bee sting?
(A) Baking Soda
(B) sodium carbonate
(C) sodium chloride
(D) Others
Correct Answer : A
What percentage of carbon is in steel?
(A) 3%
(B) 4%
(C) 2%
(D) 5%
Correct Answer : C
What kind of brushing should be done to clean the mouth so that dentistry can be stopped?
(A) acidic dentin
(B) basic dentistry
(C) neutral dentition
(D) all
Correct Answer : B
Which gas accumulates at the anode after electromagnetic decomposition of alumina?
(A) Hydrogen gas
(B) nitrogen gas
(C) Carbon dioxide gas
(D) oxygen gas
Correct Answer : D
Which of the following is the conductor of nonmetal electricity?
(A) graphite
(B) Copper
(C) Sulfur
(D) diamond
Correct Answer : A
Is zinc ore?
(A) zinc blade
(B) Bauxite
(C) sodium chloride
(D) Sinawar
Correct Answer : A
Which of the following metals can be cut with a knife?
(A) Magnesium
(B) Sulfur
(C) Sodium
(D) Chromium
Correct Answer : C
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Vikram Singh
Providing knowledgable questions of Reasoning and Aptitude for the competitive exams.
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