Heredity and Variation — Science STD 9 — Question

Fill in the blanks in the following statements:
Almost all the mass of an atom is concentrated in a small region of space called the __________.

Fill in the following blanks with suitable words:
The smell of perfume gradually spreads across a room due to _________.

Complete the following statements:
Isotopes have different mass numbers because their nuclei contain different number of _________.

Fill in the blanks in the following statements:
The electron has ________ charge, the proton has _________ charge, and the neutron has _________ charge.

High grade of ________and________ are used as raw material to manufacture bathing soap.

Fill in the following blanks with suitable words:
Newton’s first law of motion is also called Galileo’s law of ________.

Fill in the blanks in the following statements:
The subatomic particle not present in a hydrogen atom is _________.

Fill in the following blanks with suitable word:

If the area of a snow shoe is five times ______ than the area of an ordinary shoe, then the pressure of a snow shoe on the snow is five times _______.

Fill in the following blanks with suitable word:

Snow shoes work by spreading out a person’s _______ over a much bigger ______.