A. fixed volume, changeable shape.
The metric unit for temperature is celsius.
Multiplication is commutative. So both
V=IR and V=RI is same and correct formula of Ohm's law.
Angle at which under water diver sees the sun from horizontal = 
Angle from normal direction = 90 - 57 = 
Refractive index of water = 1.33
Refractive index of water = 1
We have the equation
1.33 * sin
= 1 *sin 
= 
This angle is angle from normal, so angle seen by fisherman from horizontal = 90 - 46.42 = 