Board Paper of Class 10 2015 Science (SET 2) - Solutions
(i) The questions paper comprises two section, A and B. You are to attempt both the sections.
(ii) All questions are compulsory.
(iii) There is no choice in any of the questions.
(iv) All questions of Section−A and all questions of Section−B are to be attempted separately.
(v) Question numbers 1 to 3 in Section−A are one mark questions. These are to be answered in one word or one sentence.
(vi) Question numbers 4 to 6 Section−A are two marks questions. These are to be answered in about 30 words each.
(vii) Question numbers 7 to 18 in Section−A are three marks questions. There are to be answered in about 50 words each.
(viii) Question numbers 19 to 24 in Section−A are five marks questions. These are to be answered in about 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.
(ii) All questions are compulsory.
(iii) There is no choice in any of the questions.
(iv) All questions of Section−A and all questions of Section−B are to be attempted separately.
(v) Question numbers 1 to 3 in Section−A are one mark questions. These are to be answered in one word or one sentence.
(vi) Question numbers 4 to 6 Section−A are two marks questions. These are to be answered in about 30 words each.
(vii) Question numbers 7 to 18 in Section−A are three marks questions. There are to be answered in about 50 words each.
(viii) Question numbers 19 to 24 in Section−A are five marks questions. These are to be answered in about 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.
- Question 1
Write the number of covalent bonds in the molecule of propane, C3H8. VIEW SOLUTION
- Question 2
Where is DNA found in a cell ? VIEW SOLUTION
- Question 3
The first trophic level in a food chain is always a green plant. Why ? VIEW SOLUTION
- Question 4
The absolute refractive indices of glass and water are 4/3 and 3/2 respectively. If the speed of light in glass is 2 × 108 m/s, calculate the speed of light in (i) vacuum, (ii) water. VIEW SOLUTION
- Question 5
We often observe domestic waste decomposing in the bylanes of our homes. List four ways to make the residents aware that the improper disposal of wastes is harmful to the environment and also for their own health. VIEW SOLUTION
- Question 6
List any two advantages associated with water stored in the ground. VIEW SOLUTION
- Question 7
What is meant by homologous series of carbon compounds?
Classify the following carbon compounds into two homologous series and name them.
C3H4, C3H6, C4H6, C4H8, C5H8, C5H10 VIEW SOLUTION
- Question 8
List two tests for experimentally distinguishing between an alcohol and a carboxylic acid and describe how these tests are performed. VIEW SOLUTION
- Question 9
The elements 4Be, 12Mg and 20Ca, each having two valence electrons in their valence shells, are in periods 2, 3 and 4 respectively of the modern periodic table. Answer the following questions associated with these elements, giving reason in each case:
(a) In which group should they be?
(b) Which one of them is least reactive?
(c) Which one of them has the largest atomic size? VIEW SOLUTION
- Question 10
Taking the example of an element of atomic number 16, explain how the electronic configuration of the atom of an element relates to its position in the modern periodic table and how valency of an element is calculated on the basis of its atomic number. VIEW SOLUTION
- Question 11
List three distinguish features between sexual and asexual types of reproduction, in tabular form. VIEW SOLUTION
- Question 12
List four points of significance of reproductive health in a society. Name any two areas related to reproductive health which have improved over the past 50 years in our country. VIEW SOLUTION
- Question 13
What are chromosomes? Explain how is sexually reproducing organisms the number of chromosomes in the progeny in maintained. VIEW SOLUTION
- Question 14
A pea plant with blue colour flower denoted by BB is cross-bred with a pea plant with white flower denoted by ww.
(a) What is the expected colour of the flowers in their F1 progeny?
(b) What will be the percentage of plants bearing white flower in F2 generation, when the flowers of F1 plants were selfed?
(c) State the expected ratio of the genotype BB and Bw in the F2 progeny. VIEW SOLUTION
- Question 15
- Question 16
What is meant by scattering of light ? Use this phenomenon to explain why the clear sky appears blue or the sun appears reddish at sunrise. VIEW SOLUTION
- Question 17
If the image formed by a mirror for all positions of the object placed in front of it is always erect and diminished, what type of mirror is it ? Draw a ray diagram to justify your answer. Where and why do we generally use this type of mirror ? VIEW SOLUTION
- Question 18
What is an ecosystem ? List its two main components.
We do not clean natural ponds or lakes but an aquarium needs to be cleaned regularly. Why is it so ? Explain. VIEW SOLUTION
- Question 19
What are fossils ? How are they formed ? Describe in brief two methods of determining the age of fossils. State any one role of fossils in the study of the process of evolution. VIEW SOLUTION
- Question 20
(a) Name the human male reproductive organ that produces sperms and also secretes a hormone. Write the functions of the secreted hormone.
(b) Name the parts of the human female reproductive system where
(i) fertilisation takes place.
(ii) implantation of the fertilised egg occurs.
Explain how the embryo gets nourishment inside the mother's body. VIEW SOLUTION
- Question 21
(a) What is meant by power of a lens ? Define its S.I. unit.
(b) You have two lenses A and B of focal lengths +10 cm and −10 cm respectively. State the nature and power of each lens.
(c) Which of the two lenses will form a virtual and magnified image of an object placed 8 cm from the lens ?
(d) Draw a ray diagram to justify your answer. VIEW SOLUTION
- Question 22
Write the importance of ciliary muscles in the human eye. Name the defect of vision that arises due to gradual weakening of the ciliary muscles in old age. What type of lenses are required by the persons suffering from this defect to see the objects clearly ?
Akshay, sitting in the last row in his class, could not see clearly the words written on the blackboard. When the teacher noticed it, he announced if any student sitting in the front row could volunteer to exchange his seat with Akshay. Salman immediately agreed to exchange his seat with Akshay. He could now see the words written on the blackboard clearly. The teacher thought it fit to send the message to Akshay's parents advising them to get his eyesight checked.
In the context of the above event, answer the following questions:
(a) Which defect of vision is Akshay suffering from ? Which type of lens is used to correct this defect ?
(b) State the values displayed by the teacher and Salman.
(c) In your opinion, in what way can Akshay express his gratitude towards the teacher and Salman ? VIEW SOLUTION
- Question 23
One half of a convex lens of focal length 10 cm is covered with a black paper. Can such a lens produce an image of a complete object placed at a distance of 30 cm from the lens ? Draw a ray diagram to justify your answer.
A 4 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 20 cm. The distance of the object from the lens is 15 cm. Find the nature, position and size of the image. VIEW SOLUTION
- Question 24
Both soap and detergent are some type of salts. What is the difference between them ? Describe in brief the cleansing action of soap. Why do soaps not form lather in hard water ? List two problems that arise due to the use of detergents instead of soaps. VIEW SOLUTION
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