The given picture shows that air_____.
When seen in light, air shows some suspended particles floating in it. These are the particles of dust.
Select the correct option regarding natural resources.
Useful products that we obtain from nature are called natural resources. They are never harmful. Some resources are exhaustible e.g., petrol, coal, etc. While some resources are inexhaustible e.g., sunlight, air, etc. 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.
Three glasses P, Q and R having equal Amount of water were taken at room temperature and equal amount of salt was added to each one of them. After that, P was cooled, Q was heated and R was left undisturbed. Water in which glass will now taste most salty?
Solubility increases on heating hence, water in glass 'Q' will taste more salty.
In ______, we leave a mixture in a jar undisturbed for some time so that impurities get settled at the bottom and then slowly pour clear water into another jar.
Soil is formed from rocks by the process of ____ that occurs due to effects of ____, ____, etc.
Select the option that will correctly complete the given sentence.
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.
____ in soil is the fertile component.
Humus is the dark coloured component of soil that is rich in organic matter. It makes soil fertile.
Which of these natural resources is a source of lumber used for building a house?
Lumber or timber is the wood used in construction work. Trees are the source of wood.
Refer to the given figure. The rock X can be _____.
Pumice is a porous, light yet hard igneous rock. It is so light that it can float on water.
Nidhi pushed the plunger of syringe completely and dipped its needle in water.
Then she slowly pulled the plunger while its needle was still immersed in water. Select the correct option regarding this.
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.
Which of the following statements is incorrect?
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.