Gravitation — Science STD 9 — Question

Complete the following statements:
Magnesium has 3 valence electrons in the ________ shell.

Fill in the following blanks with suitable word:
Forces in a Newton’s third law pair have equal ______ but act in opposite _______.

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Sound is caused by _____.

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The physical quantity which gives both, the speed and direction of motion of a body is called its __________.

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Work is measured as a product of ________ and ________.

An ostrich egg is the _________ animal cell.

Fill in the blanks in the following statements:
An atom has atomic mass number 23 and atomic number 11. The atom has __________ Electrons.

Name the organelles which show the analogy written as under
Kitchen of the cell __

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A colloid is a _________ mixture and its components can be separated by the technique known as __________.

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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 _______.