Solubility is a substance dissolving in a liquid. So I would say False just because of the wording here.
answer :
D. 6370.92 m
Explanation:
pls refer to the attachment...
True. E=energy M=mass c= speed of light
Answer : The correct option is, (A) 
Explanation :
The formula used for speed of sound wave is:

where,
v = speed of sound wave = 
= density of medium = 
B = bulk modulus = ?
As the formula is,

Squaring on both the sides, we get:

Now put all the given values in the above formula, we get:


Therefore, the bulk modulus of the medium is 