9th Class General Science Chapter 2 Short Questions with Answers Solved

Question: 1

Define Nitrogen cycle

Answer: 1

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It is teh process in whihc atmospheric nitrogen is converted into its compounds which then decomposes into nitrogen and goes back in the atmosphere

Question: 2

Define Green house effect.

Answer: 2

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By the combustion of fossil fuel , carbon di oxide released in air , Higher concentration of CO2 in air acts like a glass wall which traped the heat rays emitted from the earth. this CO2 increase the temperature of atmosphere. this effect is called green house effect.

Question: 3

Define Proteins.

Answer: 3

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These are the naturally occurring macromolecules which contains polymers of amino aicds.

Question: 4

Write the uses of diamond.

Answer: 4

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Diamon is used in

Question: 5

Write the importance of chlorine for plants and mammals.

Answer: 5

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It is essential element for hihger plants and mammals. Sodium salts of chlorine act as electrolytes and hydrochloric acid as digestive juices in body, Deficiency of chloride cause the impaired growth in infants.

Question: 6

Name those three elements whihc are abundently found in human found

Answer: 6

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Carbon , hydrogen and oxygen most abundant elements

Question: 7

What is Chemistry

Answer: 7

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It is chemistry of compounds of carbon as an essential element.

Question: 8

Define Respiration

Answer: 8

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It is the process by which living thing used oxygen from the air to oxidize food substance

Question: 9

What is allotropy

Answer: 9

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when an element is found in more than one physical form in the same state, it is called allotropy. Carbon is the most common example which exist int hree allotropic form diamond, graphite and bucky balls.

Question: 10

What is rare gases.

Answer: 10

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Those gases which are formed in trace amount in atmosphere and are characterized by their inertenss are called noble gases.

Question: 11

Define Photosynthesis

Answer: 11

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It is process by which green plants manufacture carbohydrates from atmosphereic carbon dioxide and waterfrom soil, in the presence of sun light

Question: 12

What is artificial atmosphere? Where it is used.

Answer: 12

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A mixture of helium and oxygen is used as an articial atmosphere by diver. It is used insted of nitrogen, as it is less soluble than nitrogen in blood to prevent the bends in high pressure work.

Question: 13

Name the allotropic forms.

Answer: 13

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1- Diamond

Question: 14

Define Inorganic compound.

Answer: 14

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There are few compounds which contain carbon but not classified organic compounds.

Question: 15

Write teh importanc eof Iron in living organisms.

Answer: 15

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Iron is essential to all living organisms. It is present in the active centre of molecules responsible for oxygen carrier and of other types of molecules for electron transport. Normally it is eightly toxic, but excessive intake can siderosis and damage to some organs.

Question: 16

Write two uses of Charenal

Answer: 16

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1- Charcoal is used in gas masks for absoring dangerous gases.

Question: 17

Write uses of Soot.

Answer: 17

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1- It is used in balck point for read ride boarders.

Question: 18

Define Organic chemistry.

Answer: 18

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Thsese compunds that are make by the combination of carbon and hydrogn .Most of the these compoudns also contain oxygen of other elements.

Question: 19

How many magnesium help in plants in photosynthesis.

Answer: 19

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Magnesium is absorbed as Mg and it concentration is crops varies between 0.1 and chlorophyll molecule and without chlorophyll the autotropic green plant would fail to carry on photosynnthesis.

Question: 20

Define Nigtrogen cycle.

Answer: 20

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Nitrogen cycle it is the process in which atmosphereic nitrogen is converted in to it is compound which then decomposes into nitrogen and goes back in the atmosphere.

Question: 21

Write the non -allotropic form of carbon.

Answer: 21

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1- Charcoal

Question: 22

Define Catenation

Answer: 22

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O eof the unique property of carbon is that its atoms combine with each other to form long chain or ring chain compouds. this property is known as catenation.

Question: 23

Write importance of expansion.

Answer: 23

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This property helps nature to preserve fish and other aquatic animals in winter, in countries where freezing of water takes place during winter.

Question: 24

What is the function of Phosphorous in plant.

Answer: 24

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The most essential functions of phosphorous in plants is in energy storage and transfer. Adenosine di and tri phosphates act as energy currency within the plants. In human being during carbohydrate metabolism and its plant during photosynthesis the energy produced is stored in the form of phosphate compuund i.e. ADP and ATP. When the phosphate compounds from either ATP or ADP is split off, a relatively large amount of energy is liberated. This energy is used in growth and reproductive processes.

Question: 25

Define Protein

Answer: 25

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proteins are also very important organic compounds. The hair, nail , flesh of human beings, animals, birds and fishes are made up of proteins.

Question: 26

Write the uses of Coke.

Answer: 26

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1- Coke is used as a fuel in industries.

Question: 27

Uses of Neon.

Answer: 27

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Advertising Sings: Neon glows red when electricity is passed through is and so it finds a used in advertising sign.

Question: 28

Use of Randon

Answer: 28

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Randon is used in the treatment of cancer.

Question: 29

Use of Argon

Answer: 29

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Light bulbs: Argon is used to fill electric light bulbs and various types of fluorescent and phototubes.

Question: 30

Uses of Helium.

Answer: 30

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1- Weather ballons: Heliium is very light gas, so it is used as an alternatively to hydrogen in weather ballons.

Question: 31

Use of Sodium

Answer: 31

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Sodium Lamps: It is used in sodium vapour lamps for street lighting.

Question: 32

Write use of Ethene gas.

Answer: 32

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Ethene gas can be used to help to ripen fruits especially bananas before they are said.Crates of green bananas are left to ripen in special ripening rooms high in concentration of the ethene gas.

Question: 33

Define Fats and Oils.

Answer: 33

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Fats and oils are carbon containing compounds which mainly acts as reserved food material.

Question: 34

What is hydrocarbon

Answer: 34

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Hydrocarbons are the simplest organic compounds, which are made up of only two elements i.e. hydrogen and carbon.

Question: 35

Use of Potassium.

Answer: 35

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In glass industry: Potassium in the from of potassium carbonate and potassium nitrate, is used in the preparation of glass.

Question: 36

Use Chlorine

Answer: 36

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Chlorien gas is very poisonous but it has many beneficial uses in daily life.

Question: 37

Write the propeties of water.

Answer: 37

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1- Water is clear colourless and ordourless liquid.

Question: 38

Use of Magnesium

Answer: 38

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Because of its low density Mg is used in preparing light but rough alloys such as magnalium . These alloys are used for the construction of cars, aircrafts and moving parts of machines.

Question: 39

Use of Krypton.

Answer: 39

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Krypton is used of fill fluorescent light and photographic flash lamps.

Question: 40

Use of Calcium.

Answer: 40

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1- Calcium is a componet of cell wall in plant cells.

Question: 41

Use of Iodine:

Answer: 41

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Iodine is used n making dyes for colour photographjy.

General-science Chapters

9th Class Chapter 2 General science Short Questions

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