Board Paper of Class 10 2013 Science Delhi(SET 2) - 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 horizontal rows are there in the modern periodic table and what are they called?
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- Question 2
List any two factors that could lead to speciation. (1)
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- Question 3
Mention one negative effect of our affluent life style on the environment.
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- Question 4
Mention the two functions of human testis. (2)
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- Question 5
Every one of us can do something to reduce our consumption of various natural resources. List four such activities based on 3-R approach.
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- Question 6
“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 7
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 8
Name the oxidising agent used for the conversion of ethanol to ethanoic acid. Distinguish between ethanol and ethanoic acid on the basis of (i) litmus test, (ii) reaction with sodium carbonate
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- Question 9
(a) Differentiate between alkanes and alkenes. Name and draw the structure of one member of each.
(b) Alkanes generally burn with clean flame. Why?
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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
An element X (atomic number 17) reacts with an element Y (atomic number 20) to form a compound.
(a) Write the position of these elements in the modern periodic table.
(b) Write the formula of the compound formed.
Justify your answer in each case.
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- Question 12
“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 13
Tabulate two distinguishing features between acquired traits and inherited traits with one example of each. (3)
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- Question 14
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 15
(a) Explain the process of regeneration in Planaria. (3)
(b) How is regeneration different from reproduction?
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- Question 16
An object of height 5 cm is placed perpendicular to the principal axis of a concave lens of focal length 10 cm. Use lens formula to determine the position, size and nature of the image if the distance of the object from the lens is 20 cm. (3)
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- Question 17
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 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) Write the function of placenta in human females. (5)
(b) List four ways of preventing pregnancy. State two advantages of using such preventive methods.
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- Question 21
(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 22
(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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- Question 23
State Snell’s law of refraction of light. Write an expression to relate refractive index of a medium with speed of light in vacuum.
The refractive index of a medium ‘a’ with respect to medium ‘b’ is 2/3 and the refractive index of medium ‘b’ with respect to medium ‘c’ is 4/3. Find the refractive index of medium ‘c’ with respect to medium ‘a’. (5)
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- Question 24
(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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