1
NDA 2017 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
The mirrors used as rear-view mirrors in vehicles are
A
concave
B
convex
C
cylindrical
D
plane
2
NDA 2017 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
Which one of the following waves is used for detecting forgery in currency notes?
A
Ultraviolet waves
B
Infrared waves
C
Radio waves
D
Microwaves
3
NDA 2017 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
The majority charge carriers in a p-type semiconductors are
A
free electrons
B
conduction electrons
C
ions
D
holes
4
NDA 2017 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
The ionisation energy of hydrogen atom in the ground state is
A
13.6 Mev
B
13.6 eV
C
13.6 J
D
zero
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