CBSE Class 9 OTBA Science Sample Question Paper

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Sample Question Papers for Class 9 Science

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Answer the following 
 
1 Name the conditions of the atmosphere that provides excellent conditions to support and sustain life.
A The atmosphere comprising of mainly Nitrogen, Oxygen, Carbon dioxide and water vapour provides excellent conditions to support and sustain life.
 
2 What are pollutants?
A The undesired components which contaminate air are called pollutants.
 
3 Name the gas that is necessary for the survival of life on earth.
A Carbon dioxide is necessary for the survival of life on earth.
 
4 `Name the phenomenon that is essential to maintain and keep the earth’s atmosphere warm.
A Photosynthesis
 
5 What is the cause for the depletion of ozone layer?
A The use of refrigerators and air conditioners, fire extinguishers, aerosol sprays like deodorants etc. results in release of CFCs and N2O in the atmosphere which is responsible for depletion of ozone layer
 
6 Give the consequences of depletion of ozone layer
A UV radiations enter into the atmosphere causing damage to all kinds of life on earth.
 
7 What is NAMP?
A NAMP stands for National Air Quality Monitoring Programmer.
 
8 What is the significance of PM10?
A PM10 is the term used to describe tiny particles in the air, made up of a complex mixture of soot, organic and inorganic materials having particle size less than or equal to 10 microns diameter(10 microns is equal to one hundredth part of a millimeter)
 
9 What do PTI and IST stand for?
A Press Trust of India, and Indian Standard Time
 
10 What is the place of Air pollution in taking lives of people in India?
A Air pollution is the fifth largest killer in India taking 6.2 lakh lives per year.

 Answer the following 

1 Name the five most critically polluted regions in the country.
A Delhi, Ghaziabad, Gwalior, West Singbhum district in Jharkhand and Raipur are the five most critically polluted regions in the country.
 
2 How acid rain is is formed?
A The oxides of sulphur, carbon, and nitrogen released into the atmosphere from chimneys of Industries and exhaust of vehicles react with water of the rains and oxygen from air to form acids. Dissolved acids make the rain acidic in nature.
 
3 What is the affect of acid rains on the environment?
A Acid rains are very harmful for both, living and nonliving things. Acid rains damage crops, pollute soil and water, ruin the harvest, damage aquatic life and erode buildings.
 
4 Name the undesirable components which contaminate and cause air pollution
A The harmful Ozone in the lower atmosphere, Carbon monoxide, Nitrogen dioxide,Solid or liquid matter that is suspended in the air, Sulfur dioxide, Lead,Arsenic,asbestos, benzene and dioxin, Green House gasses Carbon dioxide methane and nitrous oxide are the components which cause air pollution.
 
5 What is the effect of carbon monoxide on the life on earth?
A • It makes the body parts hard to get the necessary oxygen
• More exposure makes people feel dizzy and tired
• High concentrations is fatal
People suffering from heart disease are hospitalized more often.
 
6 What is the importance of Earth Day? When is it celebrated
A To give awareness to the people towards keeping the planet Earth non polluted, Earth Day is celebrated on April 22 every year.
 
7 What is Global warming?
A Increase in the levels of CO2 due to excessive burning of fossil fuels and other carbon containing fuels which results in excessive heating of the earth’s surface is called Global Warming. 
 
8 What are the greenhouse gases present in the earth’s atmosphere in their order of abundance in the atmosphere
A Water vapour, Carbon dioxide, methane, nitrous oxide, ozone, chlorofluorocarbons. 
 
9 What made the Governments of different nations take up the problem of air pollution to a central stage? 
A Smog which surrounded the city of London in the year 1952 resulted in the loss of about 4000 human lives and many others suffering from serious breathing problems .This made Governments of different nations to take-up the problem of air pollution to a central stage. 
 
10 Visibility is very low during winters. Why?
A Smog is a mixture of smoke dust particles and fog. The smoke emitted from the exhaust of the vehicles settles over fog in winter and reduces the visibility 
 
11 What is the effect of Air toxics on the Human beings?
A Air toxics can impair lung function and neurodevelopment, or aggravate existing conditions, such as asthma. Infants who were born premature or growth-retarded may be particularly vulnerable to additional environmental affects.. 
 
12 From picture no. 5 name the diseases affecting children of 0 to 5 years.
A Diseases affecting children in the age from 0 to 5 years are High respiratory rate, Respiratory death cough bronchitis wheeze and ear infections 
 
13 From picture no 5 name the diseases affecting children of 6 to 12 years.
A Chronic cough and bronchitis, Reduced lung function, wheezing and asthma attacks,.

 

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