1
NDA 2017 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
Zinc is used to protect iron from corrosion because zinc is
A
more electropositive than iron
B
cheaper than iron
C
a bluish white metal
D
a good conductor of heat and electricity
2
NDA 2017 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
Which one of the following gases is placed second in respect of abundance in the Earth's atmosphere?
A
Oxygen
B
Hydrogen
C
Nitrogen
D
Carbon dioxide
3
NDA 2017 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
Which one of the following is a chemical change?
A
Cutting of hair
B
Graying of hair naturally
C
Swelling of resin in water
D
Cutting of fruit
4
NDA 2017 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
Which one among the following chemicals is used as washing soda?
A
Calcium carbonate
B
Calcium bicarbonate
C
Sodium carbonate
D
Sodium bicarbonate
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