1
NDA General Ability 18 April 2021
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Twinkling of stars is due to
A
Particular frequencies of the starlight
B
reflection of starlight from the oceanic surface
C
atmospheric refraction of starlight
D
magnetic field of Earth
2
NDA General Ability 18 April 2021
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Which one of the following cannot be the unit of frequency of a sound wave?
A
dB
B
s-1
C
Hz
D
min-1
3
NDA General Ability 18 April 2021
MCQ (Single Correct Answer)
+4
-1.33
Change Language
'Beats' is a phenomenon that occurs when frequencies of two harmonic waves are
A
equal
B
far apart
C
multiples of each other
D
nearly same
4
NDA General Ability 18 April 2021
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Light waves are incident on an air-glass boundary. Some of the light waves are reflected and some are refracted in the glass.  Which one of the following properties is the same for the incident wave and the refracted wave?
A
Speed
B
Direction
C
Brightness
D
Frequency
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