CBSE Class 10 SA 2 Science paper of 2017 board based exam is available for download. With this article, students can download the complete question paper in PDF format. CBSE Class 10 Science 2017 board exam was held on 22 March 2017.
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General Instructions for CBSE 10th SA 2 Science Paper
(i). The question paper comprises two sections, A and B. You are to attempt both the sections.
(ii). All questions are compulsory.
(iii). There is no choice in any of the question.
(iv). All questions of Section-A and B are to be attempted separately.
(v). Question numbers 1 to 3 in Section-A are one mark question. They are to be answered in one word or in one sentence.
(vi). Question numbers 4 to 6 in Section- A are two marks questions. These are to be answered in 30 words each.
(vii). Question numbers 7 to 18 in Section-A are three marks questions. These are to be answered in about 50 words each.
(viii). Question numbers 19 to 24 in Section-A are 5 marks questions. These are to be answered in 70 words each.
(ix). Question numbers 25 to 33 in Section- B are multiple choice questions based on practical skills.
Each question is a one mark question. You are to select one most appropriate response out of the four provided to you.
(x). Question numbers 34 to 36 in Section B are two marks questions based on practical skills. These are to be answered in brief.
Some randomly selection questions from the question paper
Q. Write the molecular formula of first two members of homologous series having functional group – OH.
Q. How does plasmodium reproduce. Is this method sexual or asexual?
Q. Why is a lake considered to be a natural ecosystem?
Q. An object is placed at a distance of 12 cm in front of a concave mirror of radius of curvature 30 cm. List four characteristics of the image formed by the mirror.
Q. How do advantages of exploiting natural resources with short term gains in mind differ from the advantages of managing our resources with a long-term perspective?
Q. What is meant by wildlife? How is it important for us?
Q. The molecular formula of two carbon compounds are C4H8 and C3H8. Which one of the two is most likely to show addition reaction? Justify your answer. Also give the chemical equation to explain the process of addition reaction in this case.
Q. Write the names given to the vertical columns and horizontal rows in the Modern Periodic Table. How does the metallic character of elements very on moving down a vertical column? How does the size of atomic radius vary on moving left to right in a horizontal row? Given reason in support of your answer in the above two cases.
Q. An element P (atomic number 20) reacts with an element Q (atomic number 17) to form a compound. Answer the following questions giving reason:
Write the position of P and Q in the Modern Periodic Table and the molecular formula of the compound formed when P reacts with Q.
Q. How did Mendel’s experiments show that different traits are inherited independently? Explain.
Q. Explain with the help of an example each, how the following provide evidences in favour of evolution:
(a) Homologous organs
(b) Analogous organs
Q. What happens when:
(a) Accidently, Planaria gets cut into many pieces?
(b) Bryophyllum leaf falls on the wet soil?
(c) On maturation sporangia of Rhizopus bursts?
Q. List any four steps involved in sexual reproduction and write its two advantages.
Q. State the changes that take place in the uterus when:
(a) Implantation of embryo has occurred.
(b) Female gamete/ egg is not fertilized.
Q. The image of a candle flame placed at a distance of 30 cm from a mirror is formed on a screen placed in front of the mirror at a distance of 60 cm from its pole. What is the nature of the mirror? Find its local length. If the height of the flame is 2.4 cm, find the height of its image. State whether the image formed is erect or inverted.
Q. Write about power of accommodation of human eye. Explain why the image distance in the eye does not change when we change the distance of an object from the eye?
Q. You have been selected to talk on “ozone layer and its protection” in the school assembly on ‘Environment Day.’
(a) Why should ozone layer be protected to save the environment?
(b) List any two ways that you would stress in your talk to bring in awareness amongst your fellow friends that would also help in protection of ozone layer as well as the environment.