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Science All India Set 3 2016-2017 CBSE Class 10 Question Paper Solution

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Science [All India Set 3]
Marks: 90Date: 2017-03-21
Duration: 3h

[1]1

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

Concept: Versatile Nature of Carbon - Homologous Series
Chapter: [1.01] Carbon Compounds
[1]2

Give the importance of variation in survival of species.

Concept: Sexual Reproduction
Chapter: [2.02] Reproduction
[1]3

In the following food chain, 20,000 J of energy was available to the plants. How much energy would be available to man in this chain?    
Plants → Sheep → Man

Concept: Components of Eco System - Food Chains and Webs
Chapter: [5.02] Our Environment
[2]4

An object is placed at a distance of 15 cm from a concave lens of focal length 30 cm. List four characteristics (nature, position, etc.) of the image formed by the lens.

Concept: Refraction of Light - Image Formation by Lenses - Convex Lens
Chapter: [3] Natural Phenomena
[2]5

You being an environmentalist are interested in contributing towards the conservation of natural resources. List four activities that you can do on your own.

Concept: Introduction to Our Environment
Chapter: [5.02] Our Environment
[2]6

Why are coal and petroleum categorised as natural resources? Give a reason as to why they should be used judiciously.

Concept: Natural Resources - Coal and Petroleum
Chapter: [5.01] Management of Natural Resources
[3]7

Distinguish between esterfication and saponification reaction with the help of the chemical equations for each. 

Concept: Soaps and Detergents
Chapter: [1.01] Carbon Compounds

State one use of esterfication process.

Concept: Soaps and Detergents
Chapter: [1.01] Carbon Compounds

State one use of saponification process. 

Concept: Soaps and Detergents
Chapter: [1.01] Carbon Compounds
[3]8

Give the structural formula of ethanol.

Concept: Important Carbon Compounds - Ethanol
Chapter: [1.01] Carbon Compounds

Write the name and structural formula of the compound obtained when ethanol is heated at 443 K with excess of conc. H2SO4. Also write chemical equation for the reaction stating the role of conc. H2SO4 in it.

Concept: Important Carbon Compounds - Ethanol
Chapter: [1.01] Carbon Compounds
[3]9

What is periodicity in properties of elements with reference to the Modern Periodic Table? 

Concept: The Modern Periodic Table
Chapter: [1.03] Periodic Classification of Elements

Why do all the elements of the same group have similar properties?

Concept: The Modern Periodic Table
Chapter: [1.03] Periodic Classification of Elements

How does the tendency of elements to gain electrons change as we move from left to right in a period? State the reason of this change.

Concept: The Modern Periodic Table
Chapter: [1.03] Periodic Classification of Elements
[3]10

Write the electronic configuration of two elements X and Y whose atomic numbers are 20 and 17 respectively. Write the molecular formula of the compound formed when element X reacts with element Y. Draw the electron-dot structure of the product and also state the nature of the bond formed between both the elements.

Concept: Periodic Classification of Elements Introduction
Chapter: [1.03] Periodic Classification of Elements
[3]11

How did Mendel explain that it is possible that a trait is inherited but not expressed in an organism?

Concept: Rules for the Inheritance of Traits - Mendel’s Contributions
Chapter: [2.01] Heredity and Evolution
[3]12

What is an organic evolution? 

Concept: Human Evolution
Chapter: [2.01] Heredity and Evolution

Organic Evolution cannot be equated with progress. Explain with the help of a suitable example.

Concept: Human Evolution
Chapter: [2.01] Heredity and Evolution
[3]13

List the two types of reproduction. Which one of the two is responsible for bringing in more variations in its progeny and how?

Concept: Reproduction in Human Beings
Chapter: [2.02] Reproduction
[3]14

What is vegetative propagation? 

Concept: Reproduction - Modes of Reproduction Used by Multicellular Organisms - Vegetative Propagation
Chapter: [2.02] Reproduction

List two advantages of vegetative propagation.

Concept: Reproduction - Modes of Reproduction Used by Multicellular Organisms - Vegetative Propagation
Chapter: [2.02] Reproduction

State two disadvantages of vegetative propagation?

Concept: Reproduction - Modes of Reproduction Used by Multicellular Organisms - Vegetative Propagation
Chapter: [2.02] Reproduction
[3]15

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

Concept: Reproduction in Human Beings
Chapter: [2.02] Reproduction
[3]16

"A lens can form a magnified erect image as well as magnified inverted image of an object placed in front of it." State the nature of this lens and draw ray diagrams to justify the above statement. Mark the positions of O, F and 2F in the diagram.

Concept: Refraction of Light - Image Formation by Lenses - Convex Lens
Chapter: [3] Natural Phenomena
[3]17

What is a dispersion of white light?

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

State the cause of dispersion of white light

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

Describe an activity to show that colours of white light splitted by a glass prism can be recombined to get white light by another identical glass prism. Also draw ray diagram to show the recombination of the spectrum of white light.

Concept: Dispersion by a Prism
Chapter: [3] 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: [5.01] 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: [5.01] Management of Natural Resources
[5]19

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

Concept: Evolution - Acquired and Inherited Traits
Chapter: [2.01] 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: [2.01] Heredity and Evolution
[5]20

List two functions ovary of human female reproductive system.

Concept: Reproduction in Human Beings
Chapter: [2.02] Reproduction

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

Concept: Reproduction in Human Beings
Chapter: [2.02] Reproduction

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

Concept: Reproduction in Human Beings
Chapter: [2.02] Reproduction
[5]21

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: Versatile Nature of Carbon - Saturated and Unsaturated Carbon Compounds
Chapter: [1.01] Carbon Compounds
[5]22

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: Defects of Vision and Their Correction
Chapter: [3] Natural Phenomena
[5]23

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: Refraction of Light - Image Formation by Lenses - Convex Lens
Chapter: [3] Natural Phenomena
[5]24

 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: Representation of Images Formed by Spherical Mirrors Using Ray Diagrams - Convex Mirror
Chapter: [3] Natural Phenomena

Define the radius of curvature of spherical mirrors.

Concept: Representation of Images Formed by Spherical Mirrors Using Ray Diagrams - Convex Mirror
Chapter: [3] Natural Phenomena

Find the nature and focal length of a spherical mirror whose radius of curvature is +24 cm.

Concept: Representation of Images Formed by Spherical Mirrors Using Ray Diagrams - Convex Mirror
Chapter: [3] Natural Phenomena
[1]25

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: [3] Natural Phenomena
[1]26

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: [3] Natural Phenomena
[1]27

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: Refraction of Light - Image Formation by Lenses - Convex Lens
Chapter: [3] Natural Phenomena
[1]28

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: Representation of Images Formed by Spherical Mirrors Using Ray Diagrams - Convex Mirror
Chapter: [3] Natural Phenomena
[1]29

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: Soaps and Detergents
Chapter: [1.01] Carbon Compounds
[1]30

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: Important Carbon Compounds - Ethanoic Acid (Acetic acid)
Chapter: [1.01] Carbon Compounds
[1]31

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: Soaps and Detergents
Chapter: [1.01] Carbon Compounds
[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: [2.01] 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: Versatile Nature of Carbon - Homologous Series
Chapter: [1.01] Carbon Compounds
[2]34

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

Concept: Reproduction - Modes of Reproduction Used by Single Organisms - Fission
Chapter: [2.02] Reproduction
[2]35

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: Refraction of Light - Image Formation by Lenses - Convex Lens
Chapter: [3] Natural Phenomena
[2]36

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: Soaps and Detergents
Chapter: [1.01] Carbon Compounds

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