Why Do we Fall Ill — Science STD 9 — Question

Fill in the following blanks with suitable word: Wave speed in metres per second equals frequency in _____ Multiplied by ______ in ______.

Fill in the following blanks with suitable word:
In fluids (liquids and gases), pressure acts in ______ directions, and pressure ______ as the depth increases.

Cell wall is found only in _________ cells.

Fill in the following blanks with suitable word:
1 joule is the work done when a force of one ______ moves an object through a distance of one ______ in the direction of _______.

Give one word for the following: Growing of wheat and groundnut on the same field is called as _________.

Water and minerals are conducted by _________.

Fill in the following blanks with suitable words: The particle which is formed by the loss or gain of electrons by an atom is called _________.

Matter can neither be created nor be destroyed is law of __________.

Fill in the following blanks with suitable word: Sound cannot travel through _____.