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

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Science [Foreign 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 first two members of the homologous series having functional group  .

 

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

 

Concept: Human Reproductive System
Chapter: [0.08] How do Organisms Reproduce?
Where does fertilisation occur in a human female? 
Concept: Human Reproductive System
Chapter: [0.08] How do Organisms Reproduce?
[1] 3
List any two abiotic components of an ecosystem.  
 

 

Concept: Carbon: a Versatile Element
Chapter: [0.04] Carbon and its Compounds
[2] 4
Redraw the following diagram on your answer-sheet and show the path of the reflected ray. Also mark the angle of incidence (∠i) and the angle of reflection (∠r) on the diagram. 

 

Concept: Convex Mirror
Chapter: [0.1] Light - Reflection and Refraction
[2] 5
Suggest any two ways by which the balance between the environment and industrial development is maintained so as to help undisturbed survival of the organisms on the Earth. 

 

 

Concept: The Environment
Chapter: [0.15] Our Environment
[2] 6
Where and how did "Chipko Andolan" start in our country? How did this movement ultimately benefit the local people? 

 

 

Concept: Case Study: Ganga Pollution and Ganga Action Plan
Chapter: [0.16] Sustainable Management of Natural Resources
[3] 7
Explain, giving reason, why carbon neither forms C4+ cations nor C4− anions, but forms covalent compounds which are bad conductors of electricity and have low melting point and low boiling point. 
Concept: The Covalent Bond
Chapter: [0.03] Metals and Non Metals [0.04] Carbon and its Compounds
[3] 8
What are hydrocarbons? Write the general formula of (i) saturated hydrocarbons, and (ii) unsaturated hydrocarbons and draw the structure of one hydrocarbon of each type. How can an unsaturated hydrocarbon be made saturated?
Concept: Saturated and Unsaturated Carbon Compounds
Chapter: [0.04] Carbon and its Compounds
[3] 9
Why is atomic number considered to be a more appropriate parameter than atomic mass for the classification of elements in a periodic table? How does the metallic character of elements vary as we move (i) from left to right in a period, and (ii) top to bottom in a group in the modern periodic table? Give reasons to justify your answers.

 

 

Concept: Mendeleev’s Periodic Table
Chapter: [0.05] Periodic Classification of Elements
[3] 10
The atomic number of an element is 12.  (3)

(a) Write its electronic configuration and determine its valency.

(b) Is it more reactive or less reactive than Ca (atomic number 20)? Justify your answer giving reason.

(c) Is it a metal or a non-metal?

(d) Write the formula of its oxide.

 

Concept: Mendeleev’s Periodic Table
Chapter: [0.05] Periodic Classification of Elements
[3] 11
Name the two types of mammalian gametes. How are these different from each other? Name the type of reproduction they are involved in. Write the advantage of this type of reproduction. 
Concept: Sexual Reproduction in Animals
Chapter: [0.08] How do Organisms Reproduce?
[3] 12
How do variations arise in organisms? "Variation is useful for the survival of species." Justify this statement with the help of an example.
Concept: Accumulation of Variation During Reproduction
Chapter: [0.08] How do Organisms Reproduce? [0.09] Heredity and Evolution
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[3] 13
What is contraception? Name any two methods. How does the use of these methods have a direct effect on the health and prosperity of a family? State any three points.
Concept: Human Reproductive System
Chapter: [0.08] How do Organisms Reproduce?
[3] 14
List any three factors and mention how they could lead to the rise of a new species. 
Concept: Speciation
Chapter: [0.09] Heredity and Evolution
[3] 15
What are fossils? How do they act as an evidence for organic evolution?
Concept: Paleobotany
Chapter: [0.09] Heredity and Evolution
[3] 16
The magnification of an image formed by a lens is −1. If the distance between the object and its image is 60 cm, what is the distance of the object from the optical centre of the lens? Find the nature and focal length of the lens. If the object is displaced 20 cm towards the optical centre of the lens, where would the image be formed and what would be its nature? Draw a ray diagram to justify your answer.
Concept: Magnification Due to Spherical Lenses
Chapter: [0.1] Light - Reflection and Refraction
[3] 17

Using the phenomenon of scattering of light, explain why there is a difference in the colour of the sun as it appears during sunrise and at noon.

Concept: Applications of Scattering of Light
Chapter: [0.11] The Human Eye and the Colourful World
[3] 18

Your mother always thought that fruit juices are very healthy for everyone. One day she read in the newspaper that some brands of fruit juices in the market have been found to contain certain level of pesticides in them. She got worried as pesticides are injurious to our health.
(a) How would you explain to your mother about fruit juices getting contaminated with pesticides?
(b) It is said that when these harmful pesticides enter our body as well as in the bodies of other organisms they get accumulated and beyond a limit cause harm and damage to our organs. Name the phenomenon and write about it.

Concept: Food Chain
Chapter: [0.15] Our Environment
[5] 19

What are fossils? How are fossils formed and how is their age determined? State the importance of fossils in the study of evolution.

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

Give one example each of unisexual and bisexual flowers. Differentiate between the two types of pollination that occur in flowers. What happens when a pollen lands on a suitable stigma? Write about the events that occur till the seed formation in the ovary.

Concept: Sexual Reproduction in Flowering Plants
Chapter: [0.08] How do Organisms Reproduce?
[5] 21

What are esters? How are esters prepared? Write the chemical equation for the reaction involved. What happens when an ester reacts with sodium hydroxide? Write the chemical equation for the reaction and also state the name and use of this reaction.

Concept: Properties of Acids
Chapter: [0.02] Acids, Bases and Salts
[5] 22

Write the function of the following part of the human eye: Cornea

Concept: Human Eye: Structure of the Eye
Chapter: [0.11] The Human Eye and the Colourful World

Write the function of the following part of the human eye:- iris

Concept: Human Eye: Structure of the Eye
Chapter: [0.11] The Human Eye and the Colourful World

Write the function of the following part of the human eye: crystalline lens

Concept: Human Eye: Structure of the Eye
Chapter: [0.11] The Human Eye and the Colourful World

Write the function of the following part of the human eye: ciliary muscles

Concept: Human Eye: Structure of the Eye
Chapter: [0.11] The Human Eye and the Colourful World

Write the function of retina in human eye.

Concept: Human Eye: Structure of the Eye
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 –60 +12
2 –30 +15
3 –20 +20
4 –15 +30
5 –12 +60
6 –9 +90

(a) What is the focal length of the convex lens? State reason for your answer.
(b) For what object-distance (u) is the corresponding image-distance (v) not correct? How did you arrive at this conclusion?
(c) Choose an appropriate scale to draw a ray diagram for the observation at S. No. 4 and find the approximate value of magnification.

Concept: Convex Lens
Chapter: [0.1] Light - Reflection and Refraction
[5] 24

Define the following terms in the context of spherical mirrors :
(i) Pole

(ii) Centre of curvature

(iii) Radius of curvature

(iv) Principal axis

Concept: Spherical Mirrors
Chapter: [0.1] Light - Reflection and Refraction

Draw ray diagrams to show the principal focus of a convex mirror.

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

Draw ray diagrams to show the principal focus of a concave mirror.

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

In the following diagram. MM' is a concave mirror and AB is an object. Draw on your answer-sheet a ray diagram to show the formation of image of this object.

Concept: Concave Mirror
Chapter: [0.1] Light - Reflection and Refraction
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[1] 25

In the following diagram, the correctly marked angles are

(A) All
(B) Only ∠i and ∠A
(C) ∠i, ∠r and ∠A
(D) ∠i, ∠A and ∠D

Concept: Dispersion of Light Through Prism and Formation of Spectrum
Chapter: [0.11] The Human Eye and the Colourful World
[1] 26

When you focus the image of a distant flag, whose shape is given below, on a screen using a convex lens, the shape of the image as it appears on the screen is

(A)

(B)

(C)

(D)

Concept: Convex Lens
Chapter: [0.1] Light - Reflection and Refraction
[1] 27

An optical device has been given to a student and he determines its focal length by focusing the image of the sun on a screen placed 24 cm from the device on the same side as the sun. Select the correct statement about the device. 
(A) Convex mirror of focal length 12 cm
(B) Convex lens of focal length 24 cm
(C) Concave mirror of focal length 24 cm
(D) Convex lens of focal length 12 cm

Concept: Spherical Mirrors
Chapter: [0.1] Light - Reflection and Refraction
[1] 28

Select from the following the best experimental set-up for tracing the path of a ray of light through a glass slab:
(A) I

(B) II

(C) III

(D) IV

Concept: Refraction of Light Through a Rectangular Glass Slab
Chapter: [0.1] Light - Reflection and Refraction
[1] 29

You are asked to prepare hard water in your laboratory. Select a group from the following groups of salts, any salt of which you may dissolve in distilled water to obtain hard water.
(A) NaCl; Na2SO4; KCl
(B) NaCl; CaCl2; KCl
(C) CaCl2; CaSO4; MgSO4
(D) Na2SO4; CaSO4; MgSO4

Concept: Salts
Chapter: [0.02] Acids, Bases and Salts
[1] 30

If you take some distilled water in a test-tube, add an equal amount of acetic acid to it, shake the test-tube well and leave it undisturbed on the test-tube stand, then after about 5 minutes what would you observe?
(A) There is a layer of water over the layer of acetic acid.
(B) A precipitate is setting at the bottom of the test-tube.
(C) Bubbles of colourless gas are coming out of the test-tube.
(D) There is a clear, colourless transparent solutions in the test-tube.

Concept: Properties of Acids
Chapter: [0.02] Acids, Bases and Salts
[1] 31

Which one of the following sets of materials can be used to prepare soap? 

(A) Neem oil and calcium hydroxide

(B) Castor oil and sodium hydroxide

(C) Mineral oil and sodium hydroxide

(D) Neem oil and magnesium hydroxide

Concept: Soap
Chapter: [0.04] Carbon and its Compounds
[1] 32

Choose the correct statement(s) on budding in yeast from the following : 

I. A parent cell divides into two or more daughter cells and here the parent identity is lost.

II. In this the elongated nucleus divides to form two or more daughter nuclei.

III. A bud arises from a particular region on a parent body.

IV. After detaching from the parent body the bud grows into a new independent individual.

(A) I only

(B) III only

(C) II and III only

(D) III and IV only

Concept: Asexual Reproduction in Plant
Chapter: [0.08] How do Organisms Reproduce?
[1] 33

Select a set of homologous organs from the following: 
(A) Wings of a bat and wings of a butterfly
(B) Wings of a pigeon and wings of a bat
(C) Wings of a butterfly and wings of a pigeon
(D) Forelimbs of a duck, forelimbs of a cow and forelimbs of a lizard

Concept: Evidence of Organic Evolution
Chapter: [0.09] Heredity and Evolution
[2] 34

You have to perform the experiment, "To identify the different parts of an embryo of a gram seed." Describe the procedure that you would follow.

Concept: Sexual Reproduction in Flowering Plants
Chapter: [0.08] How do Organisms Reproduce?
[2] 35

Trace the path of a ray of light incident at an angle of 45° on a rectangular glass slab. Write the measure of the angle of refraction, the angle of emergence and the lateral displacement suffered by the ray as it passes through the slab. 

Concept: Refraction of Light Through a Rectangular Glass Slab
Chapter: [0.1] Light - Reflection and Refraction
[2] 36

If you are asked to report your observations about the following two properties of acetic acid, what would you report?
(i) Odour
(ii) Effect on litmus

Concept: Ethanoic Acid
Chapter: [0.04] Carbon and its Compounds

If you take a pinch of sodium hydrogen carbonate powder in a test-tube and add drop-by-drop acetic acid to it, what would you observe immediately? List any two main observations.

Concept: Ethanoic Acid
Chapter: [0.04] Carbon and its Compounds
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