Are all constants dimensioneless?Give examples in your support.

VERY SHORT ANSWER TYPE QUESTIONS Is there a relationship between the size of an organism and its life span? Give two examples in support of your answer.

If x and y be rational and irrational numbes respectively. Is x+y necessarily an irrational number? Given an example in support of your answer.

A vector has magnitude and directions.Does it have a location in space? Can it vary with time ? Will two equal vectors veca and vecb at different locations in space necessarily have identical physical effects? Give examples in supports for your answer.