Last updated on June 26th, 2023 at 10:44 pm
Chapter 3 Properties of Natural Resources
Chapter 3 Properties of Natural Resources | Maharashtra Board Class 7 Science | properties of natural resources class 7th questions and answers.
Fill in the blanks:
- Air is a mixture of gases it has mass and weight
- Atmospheric Pressure can be measured with the help of a barometer.
- sandy soil are made of the mineral called silicon dioxide
- Silt soil is also called sedimentary soil.
Answers
- Mass & weight
- Barometer
- Silicon dioxide
- Silt
Answer the following questions:
[Que] Which are the gases present in the air? Why is air called a Homogeneous mixture?
The gases present in the air are oxygen, nitrogen, carbon dioxide, it is called a homogenous mixture because along with gases water vapor and dust particles are also present in the air.
[Que] What is atmospheric pressure?
Molecules of gases in the air are in constant motion when these molecules collide with a body, they exert their pressure on that body, this is called air pressure, which we also call ‘atmospheric pressure. Atmospheric pressure is the same in all the directions
[Que] What is Scattering of Light?
In the air, there are fine particles of gases, dust, smoke, and moisture. If light falls on these particles, the particles scatter the light in all directions. This is called the scattering of light.
[Que] What are the states in which water is found?
Water is found in all the 3 states i.e. Solid, liquid, and gas.
[Que] What are the different uses of water?
Different Uses of water according to its properties
- With the help of a generator, water falling from a height can be used to generate electricity
- Motor vehicles use water as a coolant to control engine temperature
- There are many substances that are soluble in water Water is a universal solvent. It is used as a solvent in factories, laboratories, foods, and in various biological processes such as digestion, excretion, etc.
- The use of water for cleaning purposes, such as bathing and washing clothes, is common.
[Que] What are the different uses of soil?
Different Uses of soils are:-
- For the purpose of growing plants
- Because soil holds water, we can use it throughout the year by building bunds and lakes
- Due to its plasticity, soil can be shaped in any way. Because of this, we can use it to create many different types of articles. These articles can be baked to make them hard Water storage earthen pots, earthen lamps, idols, bricks, etc.
[Que] What are the different types of soil?
Some useful types of soil
- China clay is used to make crockery, bathroom tiles, tanks, laboratory apparatus, masks, jars, etc.
- Shadu soil is white in color, and is used to make statues and idols
- Terracotta soil: This soil is red in color. It is used to make decorative articles and pots for growing plants.
- The Multani soil is used in cosmetics
[Que] Why do we see the ice float on water?
When water freezes to become ice, it becomes lighter than the original liquid, so when it becomes solid, its volume increases, which is why ice’s density is less than water’s due to which it floats on water.
