List of top Science Questions asked in CBSE Class IX

Classify each of the following as a homogeneous or heterogeneous mixture.
soda water, wood, air, soil, vinegar, filtered tea.

What produces more severe burns, boiling water or steam?

Give two reasons to justify—
(a) Water at room temperature is a liquid.
(b) An iron almirah is a solid at room temperature.

What is the physical state of water at— 
(a) 25°C 
(b) 0°C
(c) 100°C ?

Give reason for the following observations.
(a) Naphthalene balls disappear with time without leaving any solid.
(b) We can get the smell of perfume sitting several metres away.

Convert the following temperatures to the Celsius scale.
(a) 293 K
(b) 470 K