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Science All India Set 3 2016-2017 CBSE (English Medium) Class 10 Question Paper Solution

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Science [All India Set 3]
Marks: 90 Academic Year: 2016-2017
Date & Time: 21st March 2017, 12:30 pm
Duration: 3h
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[1] 1

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

Concept: Homologous Series of Carbon Compound
Chapter: [0.04] Carbon and its Compounds
[1] 2

Give the importance of variation in survival of species.

Concept: Sexual Reproduction in Animals
Chapter: [0.08] How do Organisms Reproduce?
[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: Food Chain
Chapter: [0.15] 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: Convex Lens
Chapter: [0.1] Light - Reflection and Refraction
[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: The Environment
Chapter: [0.15] 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: Petroleum
Chapter: [0.16] Sustainable Management of Natural Resources
[3] 7

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

Concept: Soap
Chapter: [0.04] Carbon and its Compounds

State one use of esterfication process.

Concept: Soap
Chapter: [0.04] Carbon and its Compounds

State one use of saponification process. 

Concept: Soap
Chapter: [0.04] Carbon and its Compounds
[3] 8

Give the structural formula of ethanol.

Concept: Ethanol
Chapter: [0.04] Carbon and its 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: Ethanol
Chapter: [0.04] Carbon and its Compounds
[3] 9

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

Concept: The Modern Periodic Table
Chapter: [0.05] Periodic Classification of Elements

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

Concept: The Modern Periodic Table
Chapter: [0.05] 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: [0.05] 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: History of Periodic Table: Early Attempts at the Classification of Elements
Chapter: [0.05] 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: Heredity
Chapter: [0.09] Heredity and Evolution
[3] 12

What is an organic evolution? 

Concept: Human Evolution
Chapter: [0.09] Heredity and Evolution

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

Concept: Human Evolution
Chapter: [0.09] Heredity and Evolution
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[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: Human Reproductive System
Chapter: [0.08] How do Organisms Reproduce?
[3] 14

What is vegetative propagation? 

Concept: Asexual Reproduction - Asexual Reproduction in Plant
Chapter: [0.08] How do Organisms Reproduce?

List two advantages of vegetative propagation.

Concept: Asexual Reproduction - Asexual Reproduction in Plant
Chapter: [0.08] How do Organisms Reproduce?

State two disadvantages of vegetative propagation?

Concept: Asexual Reproduction - Asexual Reproduction in Plant
Chapter: [0.08] How do Organisms Reproduce?
[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: [0.08] How do Organisms Reproduce?
[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: Convex Lens
Chapter: [0.1] Light - Reflection and Refraction
[3] 17

What is a dispersion of white light?

Concept: Dispersion of Light Through Prism and Formation of Spectrum
Chapter: [0.11] The Human Eye and the Colourful World

State the cause of dispersion of white light

Concept: Dispersion of Light Through Prism and Formation of Spectrum
Chapter: [0.11] The Human Eye and the Colourful World

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 of Light Through Prism and Formation of Spectrum
Chapter: [0.11] The Human Eye and the Colourful World
[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: Overview of Natural Resource Management
Chapter: [0.16] Sustainable Management of Natural Resources

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

Concept: Overview of Natural Resource Management
Chapter: [0.16] Sustainable Management of Natural Resources
[5] 19

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

Concept: Evolution
Chapter: [0.09] 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
Chapter: [0.09] Heredity and Evolution
[5] 20

List two functions ovary of human female reproductive system.

Concept: Human Reproductive System
Chapter: [0.08] How do Organisms Reproduce?

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

Concept: Human Reproductive System
Chapter: [0.08] How do Organisms Reproduce?

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

Concept: Human Reproductive System
Chapter: [0.08] How do Organisms Reproduce?
[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: Saturated and Unsaturated Carbon Compounds
Chapter: [0.04] Carbon and its 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: Eye Defect and Its Correction: Myopia Or Near-sightedness
Chapter: [0.11] The Human Eye and the Colourful World
[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: Convex Lens
Chapter: [0.1] Light - Reflection and Refraction
[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: Convex Mirror
Chapter: [0.1] Light - Reflection and Refraction

Define the radius of curvature of spherical mirrors.

Concept: Convex Mirror
Chapter: [0.1] Light - Reflection and Refraction

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

Concept: Convex Mirror
Chapter: [0.1] Light - Reflection and Refraction
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[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 of Light Through Prism and Formation of Spectrum
Chapter: [0.11] The Human Eye and the Colourful World
[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 Through a Rectangular Glass Slab
Chapter: [0.1] Light - Reflection and Refraction
[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: Convex Lens
Chapter: [0.1] Light - Reflection and Refraction
[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: Convex Mirror
Chapter: [0.1] Light - Reflection and Refraction
[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: Soap
Chapter: [0.04] Carbon and its 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: Ethanoic Acid
Chapter: [0.04] Carbon and its 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: Soap
Chapter: [0.04] Carbon and its 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
Chapter: [0.09] 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: Homologous Series of Carbon Compound
Chapter: [0.04] Carbon and its Compounds
[2] 34

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

Concept: Asexual Reproduction - Asexual Reproduction in Plant
Chapter: [0.08] How do Organisms Reproduce?
[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: Convex Lens
Chapter: [0.1] Light - Reflection and Refraction
[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: Soap
Chapter: [0.04] Carbon and its Compounds

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