matter in our surroundings 2

When a gas jar full of air is placed upside down on a gas jar full of bromine vapours, the red-brown vapours of bromine from the lower jar go upward into the jar containing air. In this experiment:

• (a) Air is heavier than bromine

• (b) Both air and bromine have the same density

• (c) Bromine is heavier than air

• (d) Bromine cannot be heavier than air because it is going upwards against gravity

A form of matter has no fixed shape but it has a fixed volume. An example of this form of matter is

• (a) Krypton

• (b) Kerosene

• (c) Carbon steel

• (d) Carbon dioxide

Which one of the following statements is not true?

• (a) The molecules in a solid vibrate about a fixed position

• (b) The molecules in a liquid are arranged in a regular pattern

• (c) The molecules in a gas exert negligibly small forces on each other, except during collisions

• (d) The molecules of a gas occupy all the space available

. When heat is constantly supplied by a burner to boiling water, then the temperature of water during vaporisation :

• (a) Rises very slowly

• (b) Rises rapidly until steam is produced

• (c) First rises and then becomes constant

• (d) Does not rise at all

Which one of the following set 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

Which of the following phenomena always results in the cooling effect?

• (a) Condensation

• (b) Evaporation

• (c) Sublimation

• (d) None of these

Which of the following cannot be considered a form of matter?

• (a) Atom

• (b) Water

• (c) Humidity

• (d) Electron

Which of the following causes the temperature of a substance to remain constant while it is undergoing a change in its state?

• (a) Latent heat

• (b) Lattice energy

• (c) Loss of heat

• (d) None of these

Which of the following statement is correct?

• (a) Materials existing as liquids at room temperature have their melting and boiling points lower than that of room temperature.

• (b) The phenomenon involving the transition of a substance from solid to liquid state is called sublimation.

• (c) To convert a temperature on the Celsius scale to Kelvin scale, subtract 273 from the given temperature

• (d) The density of ice is less than that of water.

Which of the following statement is not true regarding the characteristic of matter?

• (a) Particles of a matter are randomly moving in all directions.

• (b) Kinetic energy of the particles increases with a rise in temperature

• (c) Kinetic energy of the particles of all maters remains the same at a particular temperature.

• (d) Particles of matter diffuse into each other on their own.