Board Paper of Class 10 2013 Science Delhi(SET 1) - Solutions
(i) The question paper comprises of two Sections, A and B. You are to attempt both the sections.
(ii) All questions are compulsory.
(iii) All question of Section-A and all questions of Section-B are to be attempted separately.
(iv) Question numbers 1 to 3 in Section-A are one mark questions. These are to be answered in one word or in one sentence.
(v) Question numbers 4 to 7 in Sections-A are two marks questions. These are to be answered in about 30 words each.
(vi) Question number 8 to 19 in Section-A are three marks questions. These are to be answered in about 50 words each.
(vii) Question numbers 20 to 24 in Section-A are five marks questions. These are to be answered in about 70 words each.
(viii) Question numbers 25 to 42 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.
- Question 1
How many vertical columns are there in the modern periodic table and what are they called?
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- Question 2
What is speciation? (1)
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- Question 3
Why should biodegradable and non-biodegradable wastes be discarded in two separate dust bins?
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- Question 4
“The chromosomes number of the sexually reproducing parents and their offspring is the same.” Justify this statement. (2)
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- Question 5
“A ray of light incident on a rectangular glass slab immersed in any medium emerges parallel to itself.” Draw labelled ray diagram to justify the statement. (2)
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- Question 6
We often observe domestic waste decomposing in the bylanes of residential colonies. Suggest ways to make people realise that the improper disposal of waste is harmful to the environment.
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- Question 7
List and explain any two advantages associated with water harvesting at community level.
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- Question 8
Write the name and the structural formula of the compound formed when ethanol is heated at 443 K with excess of cone. H2SO4. State the role of conc. H2SO4 in this reaction. Write chemical equation for the reaction.
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- Question 9
Why homologous series of carbon compounds are so called? Write chemical formula of two consecutive members of a homologous series and state the part of these compounds that determines their (i) physical properties, and (ii) chemical properties.
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- Question 10
Given below are some elements of the modern periodic table: (3)
4Be, 9Fe, 14Si, 19K, 20Ca
(i) Select the element that has one electron in the outermost shell and write its electronic configuration.
(ii) Select two elements that belong to the same group. Give reason for your answer.
(iii) Select two elements that belong to the same period. Which one of the two has bigger atomic size?
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- Question 11
Write the number of periods the modern periodic table has. How do the valency and metallic character of elements vary on moving from left to right in a period? How do the valency and atomic size of elements vary down a group?
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- Question 12
(a) Explain the process of regeneration in Planaria. (3)
(b) How is regeneration different from reproduction?
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- Question 13
Write two examples each of sexually transmitted diseases caused by (i) virus, (ii) bacteria. Explain how the transmission of such diseases be prevented? (3)
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- Question 14
Tabulate two distinguishing features between acquired traits and inherited traits with one example of each. (3)
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- Question 15
“The sex of a newborn child is a matter of chance and none of the parents may be considered responsible for it.” Justify this statement with the help of flow chart showing determination of sex of a newborn. (3)
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- Question 16
Mention the types of mirrors used as (i) rear view mirrors, (ii) shaving mirrors. List two reasons to justify your answers in each case. (3)
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- Question 17
An object of height 6 cm is placed perpendicular to the principal axis of a concave lens of focal length 5 cm. Use lens formula to determine the position, size and nature of the image if the distance of the object from the lens is 10 cm. (3)
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- Question 18
State the difference in colors of the sun observed during sunrise/sunset and noon. Give an explanation for each.
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- Question 19
(a) What is an ecosystem? List its two main components.
(b) We do not clean ponds or lakes, but an aquarium needs to be cleaned regularly. Explain.
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- Question 20
(a) Define the term ‘isomers’.
(b) Draw two possible isomers of the compound with molecular formula C3H6O and write their names.
(c) Give the electron dot structures of the above two compounds.
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- Question 21
(a) List three distinguishing features between sexual and asexual types of reproduction. (5)
(b) Explain why variations are observed in the offsprings of sexually reproducing organisms?
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- Question 22
(a) Identify A, B and C in the given diagram and write their functions. (5)
(b) Mention the role of gamete and zygote in sexually reproducing organisms.
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- Question 23
(a) State the laws of refraction of light. Give an expression to relate the absolute refractive index of a medium with speed of light in vacuum. (5)
(b) The refractive indices of water and glass with respect to air are 4/3 and 3/2 respectively. If the speed of light in glass is 2 × 108 ms−1, find the speed of light in (i) air, (ii) water.
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- Question 24
(a) A person cannot read newspaper placed nearer than 50 cm from his eyes. Name the defect of vision he is suffering from. Draw a ray diagram to illustrate this defect. List its two possible causes. Draw a ray diagram to show how this defect may be corrected using a lens of appropriate focal length.
(b) We see advertisements for eye donation on television or in newspapers. Write the importance of such advertisements.
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