CSCE TUTORIAL
Class – IX Science
Matter in Our Surroundings
- Name the two gases which are supplied in compressed form in homes and hospitals.
- Name the state of matter that have the tendency to maintain their shape when subjected to outside force.
- Name any three substances that show sublimation.
- What is dry ice?
- Name the process which occurs when a drop of Dettol is added to water.
- Name SI unit of measuring temperature. The boiling point of water is 100°C under normal atmospheric pressure. Convert this temperature to SI Units.
- Give reasons for the following:
(a) Gases fill up completely the vessel in which they are kept.
(b) Gases exert pressure on the walls of the containing vessel.
- Name three states of matter. Which state of matter is rigid and why?
- List three characteristics of particles of matter. Describe one example for each characteristic to illustrate it. Name the characteristics which are responsible for
a. spreading of smell of scent in a room and
b. water taking the shape of the vessel in which poured. - To which physical state of matter, do the following statements apply?
incompressible, no fixed shape
incompressible, high melting point
compressible, no definite volume
incompressible, highly fluid. - Define (a) Compressibility (b) Rigidity (c) Fluidity
- List any two properties of liquids which are common to gases.
- State the physical state of water as the following temperatures.
(a) 373 K (b) 300 K (c) 200 K
- A drop of ink and a drop of honey are placed in water in different beakers. Which of the two will spread faster? Give reason for your answer.
- Explain why do wet clothes dry faster when we spread them out.
- Name the state of matter in which:
(i) Layers of particles can slip and slide over one another easily.
(ii) Particles just move around randomly because of very weak force of attraction.
