1.
The speed of light will be minimum while passing through
Answer : A. glass
2.
"Decibal" is a unit of
Answer : A. sound intensity
3.
The unit of refractive index is
Answer : C. No unit
4.
Light year is the unit of
Answer : A. distance
5.
The unit of power of a lens is
Answer : C. diopter
6.
Doppler effect in sound produces apparent change in
Answer : B. frequency