_________ is the length of actual path covered by a body.

A boy moves along the path ABCD. What is the total distance covered by the boy ? What is his net displacement ?

The lungs are covered by a double layered____.

The tissue that lines and covers the body is____

Assertion (A):When an organism dies ,the hard part of the bodies settle at the bottom of sea floors and are covered by sediments. Reason (R) :A replica of the organism is formed.

Estimate the number of collisions per second suffered by a molecule in a sample of hydrogen at STP.The mean free path (average distance covered by a molecule between successive collisions)=1.38xx10^(-5)cm.

If 'a' is the length of the side of the cube, the distance between the body centrerd atom and one corner atom in the cube will be