Matter In Our Surroundings

During evaporation, particles of a liquid change to vapours only:

• (a) from the surface

• (b) from the bulk

• (c) from both surface and bulk

• (d) neither from surface nor from bulk

Which of the following statements is incorrect?

• (a) Matter is made up of particles

• (b) Matter is continuous in nature

• (c) Particles of matter are always in state of motion

• (d) Particles of matter attract each other.

Which of the following is not a matter?

• (a) Air

• (b) Feeling of cold

• (c) Dust

• (d) Humidity

Which of the following will not undergo sublimation?

• (a) Camphor

• (b) Ammonium Chloride

• (c) Iodine

• (d) Sodium Chloride

On increasing the temperature of a gas

• (a) its K.E increases

• (b) its K.E decreases

• (c) its gets converted into liquid

• (d) its particles come closer to each other

Which of the following is an example of a chemical change?

• (a) Boiling water

• (b) Burning wood

• (c) Melting ice

• (d) Dissolving sugar in water

What is the process of changing a solid directly into a gas called?

• (a) Melting

• (b) Freezing

• (c) Sublimation

• (d) Condensation

Which of the following is a physical property of matter?

• (a) Flammability

• (b) Density

• (c) Reactivity

• (d) Ability to rust

Which one of the following sets of phenomena would increase on raising the temperature?

• (a) Diffusion, evaporation, compression of gases

• (b) Evaporation, compression of gases, solubility

• (c) Evaporation, diffusion, expansion of gases

• (d) Evaporation, solubility, diffusion, compression of gases

A few substances are arranged in the increasing order of forces of attraction between their particles. Which one of the following represents a correct arrangement?

• (a) water, air, wind

• (b) oxygen, water, sugar

• (c) air, sugar, oil

• (d) salt, juice, air