Board Paper of Class 10 2016 Science (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 name and structure of an aldehyde with four carbon atoms in its molecule. VIEW SOLUTION
- Question 2
List two functions of ovary of human female reproductive system. VIEW SOLUTION
- Question 3
In a food chain of frog, grass, insect and snake, assign trophic level to frog. VIEW SOLUTION
- Question 4
The refractive indices of glass and water with respect to air are 3/2 and 4/3, respectively. If speed of light in glass is 2 × 108 m/s, find the speed of light in water. VIEW SOLUTION
- Question 5
List four stakeholders which may be helpful in the conservation of forests. VIEW SOLUTION
- Question 6
The construction of large dams leads to social and environmental problems. List two problems of each category. VIEW SOLUTION
- Question 7
The positions of eight elements in the Modern Periodic Table are given below where atomic numbers of elements are given in the parenthesis.
Period No. 2 Li (3) Be (4) 3 Na (11) Mg (12) 4 K (19) Ca (20) 5 Rb (37) Sr (38) (i) Write the electronic configuration of Ca.
VIEW SOLUTION
(ii) Predict the number of valence electrons in Rb.
(iii) What is the number of shells in Sr?
(iv) Predict whether K is a metal or a non-metal.
(v) Which one of these elements has the largest atom in size?
(iv) Arrange Be, Ca, Mg and Rb in the increasing order of the size of their respective atoms.
- Question 8
Write three different chemical reactions showing the conversion of ethanoic acid to sodium ethanoate. Write a balanced chemical equation in each case. Write the names of the reactants and the products other than ethanoic acid and sodium ethanoate in each case. VIEW SOLUTION
- Question 9
An element 'X' belong to 3rd period and group 13 of the Modern Periodic Table.
(a) Determine the number of valence electrons and the valency of 'X'.
(b) What is the molecular formula of the compound formed when 'X' reacts with an element 'Y'? (atomic number = 8).
(c) Write the name and formula of the compound formed when 'X' combines with chlorine. VIEW SOLUTION
- Question 10
An element 'X' has mass number 35 and number of neutrons 18. Write atomic number and electronic configuration of 'X'. Also, write group number, period number and valency of 'X'. VIEW SOLUTION
- Question 11
(a) List two reasons for the appearance of variations among the progeny formed by sexual reproduction.
(b)
(i) Name the part marked 'A' in the diagram.
(ii) How does 'A' reaches part 'B'?
(iii) State the importance of the part 'C'.
(iv) What happens to the part marked 'D' after fertilisation is over? VIEW SOLUTION
- Question 12
Define reproduction. How does it help in providing stability to the population of species? VIEW SOLUTION
- Question 13
Explain the term "Regeneration" as used in relation to reproduction of organisms. Describe briefly how regeneration is carried out in multicellular organisms like Hydra. VIEW SOLUTION
- Question 14
"Two areas of study namely 'evolution' and 'classification' are interlinked". Justify this statement. VIEW SOLUTION
- Question 15
How does Mendel's experiment show that traits are inherited independently? VIEW SOLUTION
- Question 16
The activities of man have adverse effects on all forms of living organisms in the biosphere. Unlimited exploitation of nature by man disturbed the delicate ecological balance between the living and the non-living components of the biosphere. The unfavourable conditions created by man himself threatened the survival not only of himself, but also of the entire living organisms on the mother earth. One of your classmates is an active member of the 'Eco-club' of your school which is creating environmental awareness amongst the school students, spreading the same in the society and also working hard for preventing environmental degradation of the surroundings.
(a) Why is it necessary to conserve our environment?
(b) State the importance of green and blue dust-bins in the safe disposal of the household waste.
(c) List two values exhibited by your classmate who is an active member of the Eco-club of your school. VIEW SOLUTION
- Question 17
The image formed by a spherical mirror is real, inverted and is of magnification −2. If the image is at a distance of 30 cm from the mirror, where is the object placed? Find the focal length of the mirror. List two characteristics of the image formed if the object is moved 10 cm towards the mirror. VIEW SOLUTION
- Question 18
Describe an activity to show that the colours of white light splitted by a glass prism can be recombined to get white light by another identical glass prism. Also, draw a ray diagram to show the recombination of the spectrum of white light. VIEW SOLUTION
- Question 19
It is desired to obtain an erect image of an object using concave mirror of focal length 12 cm.
(i) What should be the range of distance of an object placed in front of the mirror?
(ii) Will the image be smaller or larger than the object? Draw a ray diagram to show the formation of image in this case.
(iii) Where will the image of this object be if it is placed 24 cm in front of the mirror? Draw a ray diagram for this situation to justify your answer.
Show the positions of the pole, the principal focus and the centre of curvature in the above ray diagrams. VIEW SOLUTION
- Question 20
Define evolution. How does it occur? Describe how fossils provide us evidences in support of evolution. VIEW SOLUTION
- Question 21
What is placenta? Describe its structure. State its functions in case of a pregnant human female. VIEW SOLUTION
- Question 22
A carbon compound 'P', on heating with excess conc. H2SO4, forms another carbon compound 'Q', which, on addition of hydrogen in the presence of nickel catalyst, forms a saturated carbon compound 'R'. One molecule of 'R', on combustion, forms two molecules of carbon dioxide and three molecules of water. Identify P, Q and R and write chemical equations for the reactions involved. VIEW SOLUTION
- Question 23
What is atmospheric refraction? Use this phenomenon to explain the following natural events:
(a) Twinkling of stars
(b) Advanced sunrise and delayed sunset
Draw diagrams to illustrate your answer.
VIEW SOLUTION
- Question 24
(a) Define focal length of a divergent lens.
(b) A divergent lens of focal length 30 cm forms the image of an object of size 6 cm on the same side as the object at a distance of 15 cm from its optical centre. Use lens formula to determine the distance of the object from the lens and the size of the image formed.
(c) Draw a ray diagram to show the formation of image in the above situation. VIEW SOLUTION
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