MCQ
One Mach number is equal to
- AVelocity of light
- ✓Velocity of sound $(332\,\,m/\sec )$
- C$1\,\,km/\sec $
- D$1\,m/\sec $
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Assertion $A :$ For a simple microscope, the angular size of the object equals the angular size of the image.
Reason $R$ : Magnification is achieved as the small object can be kept much closer to the eye than $25\, cm$ and hence it subtends a large angle.
In the light of the above statements, choose the most appropriate answer from the options given below:

$Reason$ : A body is numerically at rest when it reverses its direction.
