1
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
Addition of gypsum to cement
A
reduces setting time of cement
B
produces very light colour of cement
C
increases setting time of cement
D
shining surface is formed
2
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
3
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
4
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
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