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Science All India Set 2 2016-2017 CBSE Class 10 Question Paper Solution

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Science [All India Set 2]
Marks: 90Academic Year: 2016-2017
Date & Time: 21st March 2017, 12:30 pm
Duration: 3h

[1]1

Write the molecular formula of the 2nd and 3rd member of the homologous series whose first member is ethene. 

Concept: Carbon: a Versatile Element
Chapter: [0.011000000000000001] Carbon Compounds [0.011000000000000001] Carbon Compounds
[1]2

Newly formed DNA copies may not be identical at times. Give one reason.

Concept: Human Reproductive System
Chapter: [0.022000000000000002] Reproduction
[1]3

In the following food chain, plants provide 500 J of energy to rats. How much energy will be available to hawks from snakes?

Plants → Rats → Snakes → Hawks 

Concept: Food Chain
Chapter: [0.052000000000000005] Our Environment
[2]4

An object is placed at a distance of 15 cm from a convex lens of focal length 20 cm. List four characteristics (nature, position, etc.) of the image formed by the lens.

Concept: Convex Lens
Chapter: [0.03] Natural Phenomena [0.03] Natural Phenomena
[2]5

Why do you think there should be equitable distribution of resources? What forces would be working against an equitable distribution of our resources?

Concept: Natural Resources - Need to Manage Our Resources
Chapter: [0.051] Management of Natural Resources
[2]6

Why must we conserve our forests? 

Concept: Natural Resources - Forests and Wild Life - Sustainable Management
Chapter: [0.051] Management of Natural Resources

List two factors responsible for causing deforestation

Concept: Natural Resources - Forests and Wild Life - Sustainable Management
Chapter: [0.051] Management of Natural Resources
[3]7

Write the number of periods and groups in the Modern Periodic Table.

Concept: The Modern Periodic Table
Chapter: [0.013000000000000001] Periodic Classification of Elements

How does the metallic character of elements in  Modern Periodic Table vary on moving from left to right in a period, and (ii) down a group?Give reason to justify your answer.

Concept: The Modern Periodic Table
Chapter: [0.013000000000000001] Periodic Classification of Elements
[3]8

Na, Mg and Al are the elements of the same period of Modern Periodic Table having, one, two and three valence electrons respectively. Which of these elements (i) has the largest atomic radius, (ii) is least reactive? Justify your answer stating reason for each case.

Concept: Periodic Properties
Chapter: [0.013000000000000001] Periodic Classification of Elements
[3]9

Complete the following chemical equations : C2H5OH`("Conc."H_2SO_4)/(443K)`>

Concept: Ethanoic Acid
Chapter: [0.011000000000000001] Carbon Compounds

Complete the following chemical equations: C2H5OH+O2

Concept: Ethanoic Acid
Chapter: [0.011000000000000001] Carbon Compounds

Complete the following chemical equations : C2H5OH + Na →

Concept: Ethanoic Acid
Chapter: [0.011000000000000001] Carbon Compounds
[3]10

Explain esterification reaction with the help of a chemical equation. Describe an activity to show esterification.

Concept: Soap
Chapter: [0.011000000000000001] Carbon Compounds
[3]11

With the help of two suitable examples, explain why certain experiences and traits earned by people during their lifetime are not passed on to their next generations. When can such traits be passed on?

Concept: Heredity - Inherited Traits
Chapter: [0.021] Heredity and Evolution
[3]12

How are the areas of study – evolution and classification – interlinked?

Concept: Evolution and Classification - Introduction
Chapter: [0.021] Heredity and Evolution
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[3]13

Write the importance of sexual reproduction in nature.

Concept: Sexual Reproduction in Animals
Chapter: [0.022000000000000002] Reproduction
[3]14

Describe reproduction by spores in Rhizopus

Concept: Reproduction in Plant - Modes of Reproduction Used by Multicellular Organisms - Spore Formation
Chapter: [0.022000000000000002] Reproduction
[3]15

List any four methods of contraception used by humans. State in brief two advantages of adopting such preventive methods.

Concept: Human Reproductive System
Chapter: [0.022000000000000002] Reproduction
[3]16

Draw ray diagrams to show the formation of three times magnified (a) real, and (b) virtual image of an object by a converging lens. Mark the positions of O, F and 2F in each diagram.

Concept: Sign Convention for Spherical Lenses
Chapter: [0.03] Natural Phenomena
[3]17

What is a dispersion of white light?

Concept: Dispersion by a Prism
Chapter: [0.03] Natural Phenomena

State the cause of dispersion of white light

Concept: Dispersion by a Prism
Chapter: [0.03] Natural Phenomena

Draw a ray diagram to show the dispersion of white light by a glass prism.

Concept: Dispersion by a Prism
Chapter: [0.03] Natural Phenomena
[3]18

Water is an elixir of life, a very important natural resource. Your Science teacher wants you to prepare a plan for a formative assessment activity, "How to save water, the vital natural resource". Write any two ways that you will suggest to bring awareness in your neighbourhood, on 'how to save water'.

Concept: Natural Resources - Overview of Natural Resource Management
Chapter: [0.051] Management of Natural Resources

Name and explain any one way by which the underground water table does not go down further.

Concept: Natural Resources - Overview of Natural Resource Management
Chapter: [0.051] Management of Natural Resources
[5]19

A student suffering from myopia is not able to see distinctly the objects placed beyond 5 m. List two possible reasons due to which this defect of vision may have arisen. With the help of ray diagrams, explain

(i) why the student is unable to see distinctly the objects placed beyond 5 m from his eyes.

(ii) the type  of the corrective lens used to restore proper vision and how this defect is corrected by the use of this lens.

(b) If, in this case, the numerical value of the focal length of the corrective lens is 5 m, find the power of the lens as per the new Cartesian sign convention

Concept: Eye Defect and Its Correction: Myopia Or Near-sightedness
Chapter: [0.03] Natural Phenomena
[5]20

Analyse the following observation table showing variation of image-distance (v) with object-distance (u) in case of a convex lens and answer the questions that follow without doing any calculations : 

S. No. Object-Distance
u (cm)
Image-Distance
v (cm)
1 –100 +25
2 –60 +30
3 –40 +40
4 –30 +60
5 –25 +100
6 –15 +120

(a) What is the focal length of the convex lens? Give reason to justify your answer.

(b) Write the serial number of the observation which is not correct. On what basis have you arrived at this conclusion?

(c) Select an appropriate scale and draw a ray diagram for the observation at S.No. 2. Also find the approximate value of magnification. 

Concept: Convex Lens
Chapter: [0.03] Natural Phenomena [0.03] Natural Phenomena
[5]21

 If the image formed by a mirror for all positions of the object placed in front of it is always diminished, erect and virtual, state the type of the mirror and also draw a ray diagram to justify your answer. Write one use such mirrors are put to and why.

Concept: Convex Mirror
Chapter: [0.03] Natural Phenomena [0.03] Natural Phenomena
[5]22

List three distinguishing features, in tabular form, between acquired traits and the inherited traits.

Concept: Evolution - Acquired and Inherited Traits
Chapter: [0.021] Heredity and Evolution

With the help of suitable examples, explain why certain traits cannot be passed on to the next generation. What are such traits called?

Concept: Evolution - Acquired and Inherited Traits
Chapter: [0.021] Heredity and Evolution
[5]23

List two functions ovary of human female reproductive system.

Concept: Human Reproductive System
Chapter: [0.022000000000000002] Reproduction

Write the functions of the following parts in a human female reproductive system : Uterus

Concept: Human Reproductive System
Chapter: [0.022000000000000002] Reproduction

Write the functions of the following parts in a human female reproductive system: Fallopian tube

Concept: Human Reproductive System
Chapter: [0.022000000000000002] Reproduction
[5]24

Why are certain compounds called hydrocarbons? Write the general formula for homologous series of alkanes, alkenes and alkynes and also draw the structure of the first member of each series. Write the name of the reaction that converts alkenes into alkanes and also write a chemical equation to show the necessary conditions for the reaction to occur.

Concept: Carbon: a Versatile Element - Saturated and Unsaturated Carbon Compounds
Chapter: [0.011000000000000001] Carbon Compounds
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[1]25

A student requires hard water for an experiment in his laboratory which is not available in the neighbouring area. In the laboratory there are some salts, which when dissolved in distilled water can convert it into hard water. Select from the following groups of salts, a group, each salt of which when dissolved in distilled water will make it hard.
(A) Sodium chloride, Potassium chloride
(B) Sodium sulphate, Potassium sulphate
(C) Sodium sulphate, Calcium sulphate
(D) Calcium sulphate, Calcium chloride

Concept: Soap
Chapter: [0.011000000000000001] Carbon Compounds
[1]26

While studying the saponification reaction, what do you observe when you mix an equal amount of colourless vegetable oil and 20% aqueous solution of NaOH in a beaker?
(A) The colour of the mixture has become dark brown
(B) A brisk effervescence is taking place in the beaker
(C) The outer surface of the beaker has become hot
(D) The outer surface of the beaker has become cold

Concept: Soap
Chapter: [0.011000000000000001] Carbon Compounds
[1]27

When you add a few drops of acetic acid to a test-tube containing sodium bicarbonate powder, which one of the following is your observation?

(A) No reaction takes place

(B) A colourless gas with pungent smell is released with brisk effervescence

(C) A brown coloured gas is released with brisk effervescence

(D) Formation of bubbles of a colourless and odourless gas

Concept: Ethanoic Acid
Chapter: [0.011000000000000001] Carbon Compounds
[1]28

Study the following ray diagram:

In this diagram, the angle of incidence, the angle of emergence and the angle of deviation respectively have been represented by

(A) y, p, z

(B) x, q, z

(C) p, y, z

(D) p, z, y

Concept: Dispersion by a Prism
Chapter: [0.03] Natural Phenomena
[1]29

A student very cautiously traces the path of a ray through a glass slab for different values of the angle of incidence (∠i). He then measures the corresponding values of the angle of refraction (∠r) and the angle of emergence (∠e) for every value of the angle of incidence. On analysing these measurements of angles, his conclusion would be

(A) ∠i > ∠r  > ∠e

(B) ∠i = ∠e  > ∠r

(C) ∠i < ∠r  < ∠e

(D) ∠i = ∠e  < ∠r

Concept: Refraction of Light - Refraction Through a Rectangular Glass Slab
Chapter: [0.03] Natural Phenomena
[1]30

Study the given ray diagrams and select the correct statement from the following:

(A) Device X is a concave mirror and device Y is a convex lens, whose focal lengths are 20 cm and 25 cm respectively.
(B) Device X is a convex lens and device Y is a concave mirror, whose focal lengths are 10 cm and 25 cm respectively.
(C) Device X is a concave lens and device Y is a convex mirror, whose focal lengths are 20 cm and 25 cm respectively.
(D) Device X is a convex lens and device Y is a concave mirror, whose focal lengths are 20 cm and 25 cm respectively.

 

Concept: Convex Lens
Chapter: [0.03] Natural Phenomena [0.03] Natural Phenomena
[1]31

A student obtains a blurred image of a distant object on a screen using a convex lens. To obtain a distinct image on the screen he should move the lens 
(A) away from the screen
(B) towards the screen
(C) to a position very far away from the screen
(D) either towards or away from the screen depending upon the position of the object

Concept: Convex Mirror
Chapter: [0.03] Natural Phenomena [0.03] Natural Phenomena
[1]32

To perform an experiment to identify the different parts of an embryo of a dicot seed, first of all you require a dicot seed. Select dicot seeds from the following group:
Wheat, Gram, Maize, Pea, Barley, Ground-nut
(A) Wheat, Gram and Pea
(B) Gram, Pea and Ground-nut
(C) Maize, Pea and Barley
(D) Gram, Maize and Ground-nut 

Concept: Heredity - Inherited Traits
Chapter: [0.021] Heredity and Evolution
[1]33

The following vegetables are kept in a basket :

Potato, Tomato, Radish, Brinjal, Carrot, Bottle-gourd

Which two of these vegetables correctly represent the homologous structures?

(A) Carrot and Tomato

(B) Potato and Brinjal

(C) Radish and Carrot

(D) Radish and Bottle-gourd

Concept: Carbon: a Versatile Element - Homologous Series of Carbon Compound
Chapter: [0.011000000000000001] Carbon Compounds
[2]34

A student places a candle flame at a distance of about 60 cm from a convex lens of focal length 10 cm and focuses the image of the flame on a screen. After that he gradually moves the flame towards the lens and each time focuses the image on the screen.  

(a) In which direction-toward or away from the lens, does he move the screen to focus the image?
(b) How does the size of the image change?
(c) How does the intensity of the image change as the flame moves towards the lens?
(d) Approximately for what distance between the flame and the lens, the image formed on the screen is inverted and of the same size?

Concept: Convex Lens
Chapter: [0.03] Natural Phenomena [0.03] Natural Phenomena
[2]35

Mention the essential material (chemicals) to prepare soap in the laboratory. Describe in brief the test of determining the nature (acidic/alkaline) of the reaction mixture of saponification reaction. 

Concept: Soap
Chapter: [0.011000000000000001] Carbon Compounds
[2]36

Draw in sequence (showing the four stages), the process of binary fission in Amoeba.

Concept: Reproduction in Plant - Modes of Reproduction Used by Single Organisms - Fission
Chapter: [0.022000000000000002] Reproduction
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