Is Matter Around Us Pure ? — Science STD 9 — Question

Brass is an alloy which is considered a _________.

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

The number of protons in the nucleus of an atom is called its __________.

_______ are both conducting tissues. (Xylem, Collenchyma, Epidermis)

In order for the force of gravitation between two bodies to become noticeable and cause motion, one of the bodies must have an extremely large __________. (Mass, Speed, Volume)

Quality of sound depends on __________. (Amplitude, Waveform, Frequency)

Momentum is a _______ quantity. Its unit is ________.

The term protoplasm was coined by _________. (J.E. Purkinje, Robert Hooke, Schleiden)

Forces in a Newton’s third law pair have equal ______ but act in opposite _______.