Physics
For which one of the following does the centre of mass lie outside the body?

A fountain pen
A book
A ring
A cricket ball

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Physics
To resolve an object in an electron microscope,

Both A & B
The wavelength of the electrons must be close to the diameter of the object
None of these
The wavelength of the electrons must be greater than the diameter of the object.

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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
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
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

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