Matter In Our Surroundings grade 9

Q1) CO₂ can be easily liquified and even solidified because :-

• It has weak forces of attraction

• It has comparatively more force of attraction than other gases

• It has more intermolecular space

• It is present in atmosphere

Q2) The state of matter which is typically formed when a gas of bosons at low densities is cooled to temperatures very close to absolute zero :-

• Gaseous state

• Liquid state

• Bose- Einstein condensate

• Plasma state

Q3) What happens to a substance when the space between it's particles is decreased :-

• Mass decreases

• Mass increases

• Volume increases

• Volume decreases

Q4) Which of the following have a regular molecular pettern and a large number of free surfaces in a 3-D space ?

• Solids & Liquids

• Liquids & Gases

• Liquids

• Solids

Q5) Under which of the following conditions, we can boil water at room temperature ?

• At low pressure

• At high pressure

• At atmospheric pressure

• At no pressure

Q6) Which of the following is not an endothermic process ?

• Fusion

• Vapourization

• Temperature

• Evaporation

Q7) Name the property of gases due to which it is possible to fill CNG in cylinders for usage as fuels :-

• Compressibility

• Solubility

• Liquefaction

• Pressure

Q8) Give an example of a practical application which is based on high gaseous compressibility :-

Q9) Select the substances from the following which do not have the property of sublimation :-

• Camphor

• Naphthalene

• Sodium Chloride

• Ammonium Chloride

• Copper Sulphate

Q10) Identify the name of the material, which has no fixed shape but a fixed volume :-

• Wood

• Mercury at -38.83 °C

• Oxygen

• Water

• An iron piece