1
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
To weld metals together, high temperature is required. Such a high temperature is obtained by burning
A
acetylene in oxygen
B
LPG in oxygen
C
methane in oxygen
D
acetylene in nitrogen
2
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
Ammonia (NH3) obtained from different sources always has same proportion of nitrogen and hydrogen. It proves the validity the law of
A
reciprocal proportion
B
constant proportion
C
multiple proportions
D
None of the above
3
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
Boric acid is an acid because its molecule
A
accepts OH$$-$$ from water releasing proton
B
combines with proton from water molecule
C
contains replaceable H+ ion
D
gives up a proton
4
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
The main constituent of vinegar is
A
acetic acid
B
ascorbic acid
C
citric acid
D
tartaric acid
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