CBSE Annual Examinations for all Class 9 students are set to begin from the last week of February or first week of March, as scheduled by different CBSE schools according to their preferences. So, before the start of exams, all class 9 students must revise their course by solving various practice papers or sample papers. Working on different problems based on important conceptual topics will help to boost your confidence level for the annual exams and help you score good marks.
Jagranjosh brings here the CBSE Class 9 Science Solved Practice Paper 2018-2019: Set-II. This practice paper has been designed as per the latest examination pattern that covers the complete syllabus of CBSE Class 9 Science.
Students must solve the CBSE Class 9 Science Practice Paper that provided paper in a stipulated time period and then match their answers with the solutions provided here. Solving the Class 9 Science practice paper that provided here, will surely progress your question solving speed and accuracy.
Few questions from the 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.
Get the complete practice paper by clicking over the following link:
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.
Also refer the links given below to access useful stuff for CBSE Class 9 Annual Exam 2019:
- NCERT Solutions for Class 9 Science
- CBSE Class 9 Maths, Science, English, Hindi and Social Science Question Papers
- CBSE Class 9 Exam 2019: Examination pattern and question paper design for all subjects
- CBSE Class 9 Mathematics Sample Paper 2019
- CBSE Class 9 Syllabus 2019: All Subjects