Jagranjosh brings here the CBSE Class 9 Science Solved Practice Paper 2017-2018: Set-II, for the class 9 annual exams 2018. This practice paper has been designed as per the new examimation pattern that covers the complete syllabus of CBSE Class 9 Science.
For Class 9, question papers are generally set by the school teachers which is why the level of questions in the question papers may vary from school to school. But despite the variations in the level of question papers set by CBSE schools, there are some common questions and topics which are picked by various schools frequently. CBSE Class 9 Science Solved Practice Paper: Set-II, will make you familiar with such important questions that will ultimately help you prepare better for the annual exam 2018 which will be conducted as per the new assessment structure.
Some of the sample questions from CBSE Class 9 Science Solved Practice Paper : Set-II are given below:
Q. Why do fish go in deep waters during day light?
During day time, the shallow water is warmer and hence it has less dissolved oxygen. Therefore fish tend to go in deep water during day time.
Q. Why is it difficult to classify bacteria ? Give two reasons.
It is difficult to classify bacteria because :
(i) These organisms do not have a well defined nucleus or organelles and do not have multicellular body designs.
(ii) Mode of nutrition of these organisms can be either autotrophic or heterotrophic.
Q. (a) Define the term scintillations?
(b) Write postulates of Rutherford’s Nuclear Model of atom?
(a) Scintillations are bright flashes produced through the α -particles in Rutherford model of an atom. When these particles passed through a slit and strikes against the gold foil, they get scattered and produce bright flashes known as scintillations.
(b) The main postulates of Rutherford’s Nuclear Model of atom are as follows:
(i) An atom is made up of two parts, nucleus and extra nuclear part. Nucleus is the center of the atom with positive charge. Extra nuclear part means the space around the nucleus in which the electrons are distributed.
(ii) The whole mass of the atom is located in the nucleus. Since the electrons have negligible mass, the mass of the atom is mainly due to protons.
(iii) The electrons revolve around the nucleus in well defined orbits.
(iv) An atom is electrically neutral because number of protons and electrons is equal.
(v) Most of the atom is empty space.
Q. What mass of sodium sulphate will react with 5.22 g of barium chloride to produce 6.10 g of sodium chloride and 2.80 g of barium sulphate? Which law did you use to calculate your answer?
Mass of barium chloride = 5.22 g
Mass of sodium chloride = 6.10 g
Mass of barium sulphate = 2.80 g
Let mass of sodium sulphate = x g
Now, total mass of reactants = total mass of products
Here, Mass Mass of sodium sulphate + Mass of barium chloride
= Mass of sodium chloride + Mass of barium sulphate
⟹ x g + 5.22 g = 6.10 g + 2.80 g
⟹ x = 8.90 – 5.22 = 3.68 g
Thus, required mass of sodium sulphate = 3.68 g
Law of conservation of mass is used here.
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Students are always advised to solve more and more practice papers as it would help you to track your preparedness, letting you know your strong and weak areas. Thus, solving a good practice paper which provides a bunch of really good questions, definitely gives an edge to your preparation level.
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