Read and download free pdf of CBSE Class 9 Science Matter in Our Surroundings Assignment Set A. Get printable school Assignments for Class 9 Science. Class 9 students should practise questions and answers given here for Chapter 1 Matter In Our Surroundings Science in Class 9 which will help them to strengthen their understanding of all important topics. Students should also download free pdf of Printable Worksheets for Class 9 Science prepared as per the latest books and syllabus issued by NCERT, CBSE, KVS and do problems daily to score better marks in tests and examinations
Assignment for Class 9 Science Chapter 1 Matter In Our Surroundings
Class 9 Science students should refer to the following printable assignment in Pdf for Chapter 1 Matter In Our Surroundings in Class 9. This test paper with questions and answers for Class 9 Science will be very useful for exams and help you to score good marks
Chapter 1 Matter In Our Surroundings Class 9 Science Assignment
Exercises
Exam Questions NCERT Class 9 Science Chapter 1 Matter in Our Surroundings
Question: What is humidity?
Ans : The air holds water vapour, this air with water is called humid air and the amount of water vapour present in the air is called humidity.
Question: Name the state of water at 100 degree Celsius, zero degree Celsius and 4 degree Celsius.
Ans : The state of water at 100 degree Celsius is gas, at 0 degree Celsius it is solid and at 4 degree Celsius it is liquid.
Question: Is it possible to turn a liquid into vapour without heating?
Ans : Yes, by the process of evaporation as evaporization of water occur below the boiling point under atmospheric pressure.
Question Why is water liquid at room temperature?
Ans : At room temperature, the molecules of water have some intermolecular force of attraction and the room temperature cannot provide sufficient heat for these molecules to overcome their force of attraction and therefore, remain in liquid phase.
Question: Cotton is solid but it floats on water. Why?
Ans : Cotton has large number of pores where air is trapped. This process reduces cotton’s density and increase the volume. Therefore, cotton floats on water. But, when these pores get filled with water, it starts sinking.
Question: What is normal atmospheric pressure?
Ans : The atmospheric pressure at sea level is 1 atmosphere and taken as the normal atmospheric pressure.
Question: Give two examples of diffusion.
Ans : Milk drops dissolved in water and perfume sprayed in a room.
Question: On a hot sunny day, why do people sprinkle water on the roof or open grounds?
Ans : During hot sunny day, the surface of roof or ground absorbs large amount of heat and remains hot. On sprinkling water on these surfaces, the water absorbs large amount of heat from the surface of roof and water evaporates thereby causing cooling effect.
Question: Discuss the factors which affect evaporation.
Ans : There are four factors which affect evaporation.
(i) Surface area : Escaping of particles from liquid state to vapour state depends on surface area.
Therefore, the rate of evaporation increases with surface area.
(ii) Temperature : Rise in temperature, rise the kinetic energy of substance and therefore, chance of escaping of particles is great from liquid to vapour state.
(iii) Wind : The rate of evaporation increases with speed of wind.
(iv) Humidity : Humidity is the amount of vapour present in the air. At fixed temperature air can’t hold more than fixed amount of water vapour.
Therefore, the evaporation rate decreases if humidity increases in air.
Please click the link below to download CBSE Class 9 Science Matter in Our Surroundings Assignment Set A
CBSE Class 9 Science Matter in Our Surroundings Assignment Set A |
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More Study Material
CBSE Class 9 Science Chapter 1 Matter In Our Surroundings Assignment
We hope you liked the above assignment for Chapter 1 Matter In Our Surroundings which has been designed as per the latest syllabus for Class 9 Science released by CBSE. Students of Class 9 should download and practice the above Assignments for Class 9 Science regularly. We have provided all types of questions like MCQs, short answer questions, objective questions and long answer questions in the Class 9 Science practice sheet in Pdf. All questions have been designed for Science by looking into the pattern of problems asked in previous year examinations.
Assignment for Science CBSE Class 9 Chapter 1 Matter In Our Surroundings
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Chapter 1 Matter In Our Surroundings Assignment Science CBSE Class 9
All questions and their answers for the assignment given above for Class 9 Science have been developed as per the latest curriculum and books issued for the current academic year. The students of Class 9 can rest assured that the best teachers have designed the questions of Science so that you are able to revise the entire syllabus if you do the assignments. Lot of MCQ questions for Class 9 Science have also been given in the worksheets and assignments for regular use. All study material for Class 9 Science students have been given on studiestoday.
Chapter 1 Matter In Our Surroundings Assignment CBSE Class 9 Science
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CBSE Science Class 9 Chapter 1 Matter In Our Surroundings Assignment
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