Here we present the CBSE Class 9 Science Solved Practice Paper 2018-2019 to help students prepare for the upcoming mid-term exams or the periodic tests. This practice paper has been designed to contain most of the important questions from Class 9 Science. We have also provided appropriate answers to all the questions given in this practice paper. These answers will help you understand the criteria about the word limit and inclusion of key concepts to write perfect solutions the exams and grab high scores.
Structure of CBSE Class 9 Science Solved Practice Paper 2018-2019: Set-I
Students may download the complete CBSE Class 9 Science practice paper and practice it later whenever they get a grasp of all basic concepts and fundamentals explained in the subject.
Some of the sample questions from CBSE Class 9 Science Solved Practice Paper 2018-2019: Set-I are given below:
(ii) Buoyant force
Ans. (i) The states of matter that can flow due to less intermolecular force of attraction and have no fixed shape, are called as fluids. For example: Liquids and gases.
(ii) Buoyant force: It is the upward force exerted by any fluid upon a body placed in it.
Q. List any three properties on the basis of which a colloidal solution can be recognized.
Ans. Following are the properties that can help distinguish a colloidal solution: (Write any three)
(i) The particles in a colloidal solution are too small to be viewed by naked eyes. These particles can be observed only through an ultra microsope.
(ii) Particles of a colloidal solution do not settle down when left undisturbed.
(iii) Colloidal solutions cannot be filtered using a filter paper.
(iv) Colloidal solution is heterogeneous a solution.
Q. How would you confirm that a colourless liquid given to you is pure water?
Ans. Pure water has a fixed boiling point of 100oC under standard atmospheric pressure. This fact can be used to confirm that a colourless liquid given to us is water as follows : We take the colourless liquid in a distillation flask fitted with a thermometer. Let us heat the flask with a gas burner till the liquid starts boiling. If all the colourless liquid distils over (or boils off) at the same temperature of 100oC, without leaving behind any residue in the distillation flask, it will be pure water.
Q. Name the adaptation of fish which helps it in each of the following:
(i) Swimming in water,
Ans. (a) Streamlined body shape and fins helps the fish to swim in water
(b) Fish has developed special structures called gills which absorbs the dissolved oxygen in water and help it in breathing.
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In order to get good marks in Science it’s quite important that students do a lot of practice of the concepts and theories lerarned in the subject. So, students must solve more and more practice papers to write their exam well and score optimum marks.