1
NDA 2018 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
Which one of the following statement about the refractive index of a material medium with respect to air is correct?
A
It can be either positive or negative.
B
It can have zero value.
C
It is unity for all materials.
D
It is always greater than one.
2
NDA 2018 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
Which one of the following statement about magnetic field lines is not correct?
A
They can emanate from a point.
B
They do not cross each other.
C
Field lines between two poles cannot be precisely straight lines at the ends.
D
There are no field lines within a bar magnet.
3
NDA 2018 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
Two convex lenses with power 2D are kept in contact with each other. The focal length of the combined lens system is
A
0.10 m
B
2 m
C
4 m
D
0.25 m
4
NDA 2018 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
Which of the following statement(s) about electromagnetic waves, sound waves and water waves is/are correct?

1. They exhibit reflection.

2. They carry energy.

3. They exert pressure.

4. They can travel in vacuum.
A
1, 2 and 3
B
2 and 4
C
1 and 3
D
Only 1
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