Board Paper of Class 10 2015 Science All India(SET 3) - 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 butane, C4H10. VIEW SOLUTION
- Question 2
Name two simple organisms having the ability of regeneration. VIEW SOLUTION
- Question 3
Which of the following are always at the second trophic level of food chains? VIEW SOLUTION
- Question 4
Draw a ray diagram to show the path of the reflected ray corresponding to an incident ray of light parallel to the principal axis of a convex mirror and show the angle of incidence and angle of reflection on it. VIEW SOLUTION
- Question 5
Why is sustainable management of natural resources necessary? Out of the two – reuse and recycle – which, in your opinion, is better to practise? Give reason. VIEW SOLUTION
- Question 6
What is meant by bio-diversity? List two advantages of conserving forests and wild life. VIEW SOLUTION
- Question 7
Write the name and general formula of a chain of hydrocarbons in which an addition reaction with hydrogen is possible. State the essential condition for an addition reaction. Stating this condition, write a chemical equation giving the name of the reactant and the product of the reaction. 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
Given below are some elements of the modern periodic table. Atomic number of the element is given in the parentheses :
A(4), B(9), C(14), D(19), E(20)(a) Select the element that has one electron in the outermost shell, Also write the electronic configuration of this element.
(b) Which two elements amongst these belong to the same group ? Give reason for your answer.(c) Which two elements amongst these belong to the same period ? Which one of the two has bigger atomic radius?
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
- Question 12
List any four methods of contraceptions used by humans. state in brief two advantages of adopting such preventive methods. 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
- Question 15
Explain with an example for each how the following provides evidences in favour of evolution in organism:
(a) Homologous organs
(b) Analogous organs
(c) Fossils VIEW SOLUTION
- Question 16
With the help of scattering of light, explain the reason for the difference in colours of the sun as it appears during the sunset/sunrise and noon. VIEW SOLUTION
- Question 17
An object of height 5 cm is placed perpendicular to the principal axis of a concave lens of focal length 10 cm. If the distance of the object from the optical centre of the lens is 20 cm, determine the position, nature and size of the image formed using the lens formula. VIEW SOLUTION
- Question 18
Differentiate between biodegradable and non-biodegradable substances with the help of one example each. List two changes in habit that people must adopt to dispose non-biodegradable waste, for saving the environment. VIEW SOLUTION
- Question 19
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 20
(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 21
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 22
How do Mendel's experiments show that the
(a) traits may be dominant or recessive,(b) traits are inherited independently ?
VIEW SOLUTION
- Question 23
(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 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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