Test: Matter In Our Surroundings (Easy) - Class 9 MCQ

Evaporation of water through pores of earthen pot reduces temperature of immediate surroundings. This makes the water cool after some time.

Movement of water through plants and evaporation through its aerial parts is called transpiration.

Diffusion is the movement of a substance from an area of higher concentration to area of lower concentration If molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one it is called osmosis.

As Meena pushes the bottle, the water level in the bottle increases and air present in the bottle gets pushed into the tube, which is bubbled out from the beaker. This experiment proves that air and water occupy some space, and only one matter can occupy space at any one time.

Bose-Einstein condensate (BEC), a state of matter in which separate atoms or subatomic particles, cooled to near absolute zero (0 K, − 273.15 °C, or − 459.67 °F; K = kelvin), coalesce into a single quantum mechanical entity—that is, one that can be described by a wave function—on a near-macroscopic scale.

BaCl2 ​+ Na2SO4 ​ → 2NaCl + BaSO4 ​ ↓

This is a double displacement reaction as the two compounds exchange their ions to form two different compounds.