Physics
A bomb explodes on the moon. You will hear its sound on earth after ________

2 hours 20 minutes
3.7 hours
20 minutes
You cannot hear the sound of explosion

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Physics
An egg sinks in soft water but floats in a concentrated solution of salt because

Water has high surface tension
Egg absorbs salt from the solution and expands
Albumin dissolves in salt solution and egg becomes lighter
The density of salt solution exceeds the density of eggs

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Physics
It takes much longer to cook food in the hills than in the plains, because

in the hills the atmospheric density is low and therefore a lot of heat is lost to the atmosphere
n the hills the atmospheric pressure is lower than that in the plains and therefore water boils at a temperature lower than 100oC causing an increase in cooking time
due to low atmospheric pressure on the hills, the water boils at a temperature higher than 100oC and therefore water takes longer to boil
in the hills the humidity is high and therefore a lot of heat is absorbed by the atmosphere leaving very little heat for cooking

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