1
NDA 2019 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
In which of the following pairs are the isoelectronic ions?
A
Mg2+, Ar
B
Na+, O2$$-$$
C
Al3+, Cl$$-$$
D
K+, Ne
2
NDA 2019 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
Which one of the following is used as a binder in paints?
A
Titanium dioxide
B
Novolac
C
Phthalocyanine
D
Silicones
3
NDA 2019 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
Basic scientific principle behind a nuclear reactor is
A
nuclear fusion
B
controlled nuclear fusion
C
uncontrolled nuclear fission
D
controlled nuclear fission
4
NDA 2019 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
Which one of the following could be the melting point of iron?
A
25$$^\circ$$C
B
37$$^\circ$$C
C
500$$^\circ$$C
D
1500$$^\circ$$C
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