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CBSE Class 9 Science Exam 2018: Important questions for latest exam format

Feb 7, 2018 17:25 IST
    CBSE Class 9 Science: Important questions
    CBSE Class 9 Science: Important questions

    In this article we are providing important questions for CBSE class 9 Science exam 2018 to help you prepare easily and effectively for the final exam.

    All the questions have been prepared by our experts by following the past year exam trend and the latest syllabus. Here you will find the questions picked from every important topic of CBSE class 9 Science. Each question has been provided with an appropriate solution designed in a simple language which is easy to understand.

    Find below the important questions for different categories in CBSE Class 9 Science Annual Exam 2018:

    Important Very Short Answer Type Questions:

    Here we provide a set of questions which should be prepared for the 1 mark and 2 marks answer type questions:

    • Question numbers 1 and 2 in Section-A are one mark question. They are to be answered in one word or in one sentence.
    • Question numbers 3 to 5 in Section- A are two marks questions. These are to be answered in 30 words each.

    Some sample questions from the set of Important Very Short Answer Type Questions for CBSE Class 9 Science Exam, are given below:

    Q. Mention two uses of isotopes in the field of medicine.

    Ans.

    (i) An isotope of cobalt is used in the treatment of cancer.

    (ii) An isotope of iodine is used in the treatment of goitre.

    Q. Who discovered vaccine for the first time?

    Ans.

    Edward Jenner discovered vaccine for the first time.

    Q. Why do fish go in deep waters during day light?

    Ans.

    During day time, the shallow water is warmer and hence contains less dissolved oxygen. Therefore fish tend to go in deep water during day time.

    Get here the complete set of CBSE Class 9 Science: Important Very Short Answer Type Questions

    Important Short Answer Type Questions:

    Here you will get important questions to be prepared for 3 marks answer type questions asked in CBSE class 9 Science paper.

    • Question numbers 6 to 15 in Section- A are three marks questions. These are to be answered in about 50 words each.

    Some sample questions from the set of Important Short Answer Type Questions for CBSE Class 9 Science Exam, are given below:

    Q. (a) Name two properties of a substance to check its purity?

    (b) Alloys cannot be separated by physical means, though it is considered mixture, Why?

    Ans.

    (a) A pure substance has a fixed melting point or boiling point at constant pressure. The purity of a substance can be tested by checking its melting point or boiling point. If a substance is impure i.e. it contains traces of another substance, the melting and boiling point of that substance will change.

    (b) Alloys are homogeneous mixtures of metals and cannot be separated into their components by physical methods. But still, an alloy is considered as a mixture because it shows the properties of its constituents and can have variable composition.

    Q. Is it possible that an object is in the state of accelerated motion due to external force acting on it, but no work is being done by the force? Explain it with an example.

    Ans.      

    Yes, it is possible, if an object is moving in a circular path because in that case the centripetal force always acts perpendicular to the direction of displacement.

    For example: Consider the motion of earth around sun. The earth is constantly moving in a direction perpendicular to the gravitation pull of sun, hence work done by the gravitational force is zero.

    Get here the complete set of CBSE Class 9 Science: Important Short Answer Type Questions

    Important Long Answer Type Questions:

    Get here a collection of long answer type questions to be prepared for the 5 marks answer type questions:

    • Question numbers 16 to 21 in Section-A are 5 marks questions. These are to be answered in 70 words each.

    Some sample questions from the set of Important Long Answer Type Questions for CBSE Class 9 Science Exam, are given below:

    Q. (a) List any four properties of a colloid and mention any two properties in which colloids differ from suspension.

    (b) State what is Tyndall effect ? Which of the following solutions will show Tyndall effect ? Starch solution, sodium chloride solution, Tincture iodine, air

    Ans.

    (a)  Properties of a colloid (any four)
    (i) A colloid is a heterogeneous mixture.
    (ii) The size of particles of a colloid is too small to be individually seen by naked eyes. 
    (iii) Colloids are big enough to scatter a beam of light passing through it and make its path visible. 
    (iv) They do not settle down when left undisturbed, that is, a colloid is quite stable.
    (v) They cannot be separated from the mixture by the process of filtration. But, a special technique of separation known as centrifugation can be used to separate the colloidal particles.

    Two properties in which colloids differ from suspension are (ii) and (iii) as the particles of a suspension are large enough to be observed with a naked eye and these particles settle down well when the mixture is left undisturbed.

    (b) Tyndall effect is the phenomenon of scattering of a beam of light by the particles of a colloid.

    Starch solution and tincture iodine are colloid and thus will show Tyndall effect.

    Q. (a) What is immunisation ?

    (b) Define immunity and vaccination.

    (c) Define vaccine.

    (d) What type of diseases can be prevented through vaccination?

    Ans.

    (a) Immunisation: It is a process of inoculation (injecting) of substance (vaccine) into a healthy person in order to develop immunity against the disease.

    (b) Immunity: Immunity is the ability of a body to recognise, destroy and eliminate external disease-causing agents.

    Vaccination: Vaccination is the administration of antigenic material (a vaccine) to stimulate an individual's immune system to develop immunity to a pathogen.

    (c) Vaccine: A vaccine is a solution containing the disease-causing organisms in a diluted or weakened form. It may have organisms in living or even dead form.This does not actually cause the disease but this would prevent any subsequent exposure to the infecting microbe from turning into actual disease.

    (d) Protection against diseases like smallpox, rabies, polio, diphtheria, chickenpox and hepatitis is provided through vaccination. It has been possible to eradicate smallpox from all regions of the world through a massive vaccination programme.

    Get here the complete set of CBSE Class 9 Science: Important Long Answer Type Questions

    We suggest you to go through the CBSE class 9 Important Questions and solve them before you see their Answers. Practicing these questions will help you prepare well for the annual exams and score high marks.

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