Test: Natural Resources - 1 - Class 4 MCQ

In the morning, if we examine the beam of light entering our room, we will notice tiny particles floating in air. These are dust particles. Hence, it shows that air contains dust particles.

Useful products that are obtained from nature are called natural resources. Resources we get from soil are mineral resources e.g., gold, coal while those we get from other than soil are non-mineral resources e.g., air and water.

Since water in glass ‘Q’ is heated, therefore, water in glass 'Q' will taste more salty as the solubility increases on heating.

Decantation is the process of separation of liquid from solid and other immiscible (non-mixing) liquids, by removing the liquid layer at the top from the layer of solid or liquid below.

Formation of soil is a slow and gradual process. Soil is formed by the breaking down of rocks by the action of wind, water, temperature and microorganisms. This is called weathering.

Humus is the dark coloured component of soil that is rich in organic matter. It makes soil fertile.

Lumber or timber is the wood used in construction work. Trees are the source of wood.

Pumice is a porous, light yet hard igneous rock. It is so light that it can float on water.

When plunger is pushed down, the air inside the syringe is pushed out, creating an empty space. When the plunger is pulled up the water rushes up to take the empty space due to the air pressure acting on it outside the syringe.

Black gold is another name of oil or petroleum. It is black when it comes out of ground and is worth a great deal of money.