The Fundamental Unit of Life — Science STD 9 — Question

A sulphide ion has negative charge because it contains less ____________ than ____________.

Newton’s first law of motion is also called Galileo’s law of __________. (Friction, Motion, Inertia)

The electricity meter installed in our home measures electric energy in the units of _____.

The electron has Negative charge, the proton has Positive, charge, and the neutron has _________ charge. (Negative, Positive, No charge)

An object has __________ weight in outer space and during free fall. (More, Less, Zero)

An echo is simply a __________ sound. (Reflected, Absorbed, Transmitted)

Growing different crops on a piece of land in a pre-planned succession is known as __________. (Crop Rotation, Inter Cropping, Intensive Farming)

The smell of perfume gradually spreads across a room due to _________.

The valency of nitrogen in N₂ molecule is ________. (3, 2, 4)

Music is a sound of rich __________. (Rhythm, Pitch, Noise)