1
NDA General Ability 18 April 2021
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Reaction of quick lime (CaO) with water to produce slaked lime (Ca(OH)2) is an example of
A
Displacement reaction
B
Endothermic reaction
C
Decomposition reaction
D
Exothermic reaction
2
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
3
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
4
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
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