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Science Delhi Set 2 2016-2017 CBSE (English Medium) Class 10 Question Paper Solution

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

[1]1

Write the molecular formula of first two members of homologous series having functional group −Br.

Concept: Homologous Series of Carbon Compound
Chapter: [0.011000000000000001] Carbon Compounds
[1]2

How does Planaria reproduce? Is this method sexual or asexual?

Concept: Asexual Reproduction in Plant
Chapter: [0.022000000000000002] Reproduction
[1]3

Why is forest considered a natural ecosystem?

Concept: Case Study: Ganga Pollution and Ganga Action Plan
Chapter: [0.051] Management of Natural Resources
[2]4

An object is placed at a distance of 40 cm in front of a convex mirror of radius of curvature 40 cm. List four characteristics of the image formed by the mirror.

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

Why is sustainable management of natural resources necessary?

Concept: Sustainability of Natural Resources
Chapter: [0.051] Management of Natural Resources

Out of the two-reuse and recycle-which, in your opinion, is better to practise? Give reason.

Concept: Case Study: Ganga Pollution and Ganga Action Plan
Chapter: [0.051] Management of Natural Resources
[2]6

Explain giving example where active involvement of local people lead to efficient management of forest.

Concept: Stakeholders of Forest
Chapter: [0.051] Management of Natural Resources
[3]7

Complete the following chemical equations :CH3COOH + Na2CO3 →

Concept: Ethanoic Acid
Chapter: [0.011000000000000001] Carbon Compounds

Complete the following chemical equations : CH4 + O2 →

Concept: Chemical Properties of Carbon Compound
Chapter: [0.011000000000000001] Carbon Compounds

Complete the following chemical equations : C2H5OH + Na →

Concept: Ethanoic Acid
Chapter: [0.011000000000000001] Carbon Compounds
[3]8

Two carbon compounds X and Y have the molecular formula C3H6 and C4H10 respectively. Which one of the two is most likely to show addition reaction? Justify your answer. Also give the chemical equation to explain the process of addition reaction in this case.

Concept: Chemical Properties of Carbon Compound
Chapter: [0.011000000000000001] Carbon Compounds
[3]9

An element P (atomic number 20) reacts with an element Q (atomic number 17) to form a compound. Answer the following questions giving reason:

Write the position of P and Q in the Modern Periodic Table and the molecular formula of the compound formed when P reacts with Q.

Concept: History of Periodic Table: Early Attempts at the Classification of Elements
Chapter: [0.013000000000000001] Periodic Classification of Elements
[3]10

Write the names given to the vertical columns and horizontal rows in the Modern Periodic Table. How does the metallic character of elements vary on moving down a vertical column? How does the size of atomic radius vary on moving left to right in a horizontal row? Give reason in support of your answer in the above two cases.

Concept: The Modern Periodic Table
Chapter: [0.013000000000000001] Periodic Classification of Elements
[3]11

Mention the total number of chromosomes along with the sex chromosomes that are present in a human female and a human male. Explain how in sexually producing organisms the number of chromosomes in the progeny remains the same as that of the parents.

Concept: Human Reproductive System
Chapter: [0.022000000000000002] Reproduction
[3]12

State the changes that take place in the uterus when Implantation of embryo has occurred

Concept: Human Reproductive System
Chapter: [0.022000000000000002] Reproduction

State the changes that take place in the uterus when Female gamete/egg is not fertilised

Concept: Human Reproductive System
Chapter: [0.022000000000000002] Reproduction
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[3]13

What happens when a Planaria gets cut into two pieces?

Concept: Asexual Reproduction in Plant
Chapter: [0.022000000000000002] Reproduction

What happens when Bryophyllum leaf falls on the wet soil?

Concept: Asexual Reproduction in Plant
Chapter: [0.022000000000000002] Reproduction

What happens when On maturation sporangia of Rhizopus bursts?

Concept: Asexual Reproduction in Plant
Chapter: [0.022000000000000002] Reproduction
[3]14

"Natural selection and speciation leads to evolution." Justify this statement.

Concept: Speciation
Chapter: [0.021] Heredity and Evolution
[3]15

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

Concept: Evolution
Chapter: [0.021] Heredity and Evolution
[3]16

A 3 cm tall object is placed 18 cm in front of a concave mirror of focal length 12 cm. At what distance from the mirror should a screen be placed to see a sharp image of the object on the screen. Also calculate the height of the image formed.

Concept: Concave Mirror
Chapter: [0.03] Natural Phenomena
[3]17

With the help of ciliary muscles the human eye can change its curvature and thus alter the focal length of its lens. State the changes that occur in the curvature and focal length of the eye lens while viewing (a) a distance object, (b) nearby objects.

Concept: Human Eye: Structure of the Eye
Chapter: [0.03] Natural Phenomena

Explain, why a normal eye is not able to see distinctly the objects placed closer than 25 cm, without putting any strain on the eye.

Concept: Human Eye: Structure of the Eye
Chapter: [0.03] Natural Phenomena
[3]18

You have been selected to talk on 'ozone layer and its protection" in the school assembly on 'Environment Day.' 

(a) Why should ozone layer be protected to save the environment?
(b) List any two ways that you would stress in your talk to bring in awareness amongst your fellow friends that would also help in protection of ozone layer as well as the environment.

Concept: Ozone Layer Depletion
Chapter: [0.052000000000000005] Our Environment
[5]19

Draw a ray diagram to explain the term angle of deviation.

Concept: Dispersion of White Light Through Prism
Chapter: [0.03] Natural Phenomena

 Why do the component colours of incident white light split into a spectrum while passing through a glass prism, explain

Concept: Dispersion of White Light Through Prism
Chapter: [0.03] Natural Phenomena

Answer the following question:
What is a rainbow? Draw a labelled diagram to show the formation of a rainbow.

Concept: Applications of Scattering of Light
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 −90 +18
2 −60 +20
3 −30 +30
4 −20 +60
5 −18 +90
6 −10 +100


(a) What is the focal length of the convex lens? Give reason in support of your answer.
(b) Write the serial number of that observation which is not correct. How did you arrive at this conclusion?
(c) Take an appropriate scale to draw ray diagram for the observation at S. No. 4 and find the approximate value of magnification.

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

To construct a ray diagram we use two rays which are so chosen that it is easy to know their directions after reflection from the mirror. List two such rays and state the path of these rays after reflection in case of concave mirrors. Use these two rays and draw ray diagram to locate the image of an object placed between pole and focus of a concave mirror.

Concept: Concave Mirror
Chapter: [0.03] Natural Phenomena

A concave mirror produces three times magnified image on a screen. If the object is placed 20 cm in front of the mirror, how far is the screen from the object.

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

Both soap and detergent are some type of salts. What is the difference between them?

Concept: Soap
Chapter: [0.011000000000000001] Carbon Compounds

Why do soaps not form lather in hard water?

Concept: Soap
Chapter: [0.011000000000000001] Carbon Compounds

List two problems that arise due to the use of detergents instead of soaps.

Concept: Soap
Chapter: [0.011000000000000001] Carbon Compounds
[5]23

How do Mendel’s experiments show that the traits may be dominant or recessive 

Concept: Heredity
Chapter: [0.021] Heredity and Evolution

How do Mendel's experiment show that traits are inherited independently?

Concept: Heredity
Chapter: [0.021] Heredity and Evolution
[5]24

Name the human male reproductive organ that produces sperms and also secretes a hormone. Write the functions of the secreted hormone.

Concept: Human Reproductive System
Chapter: [0.022000000000000002] Reproduction

Name the parts of the human female reproductive system where

i. fertilisation takes place

ii. implantation of the fertilised egg occurs

Concept: Human Reproductive System
Chapter: [0.022000000000000002] Reproduction

Explain how the embryo gets nourishment inside the mother’s body.

Concept: Human Reproductive System
Chapter: [0.022000000000000002] Reproduction
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[1]25

Four students A, B, C and D reported the following set of organs to be homologous. Who is correct ?

(A) Wings of a bat and a butterfly

(B) Wings of a pigeon and a bat

(C) Wings of a pigeon and a butterfly

(D) Forelimbs of cow, a duck and a lizard

Concept: Evidence of Evolution
Chapter: [0.021] Heredity and Evolution
[1]26

A student while observing an embryo of a gram seed listed various parts of the embryo as listed below : 
Testa, Micropyle, Cotyledon, Tegmen, Plumule, Radicle. On examining the list the teacher commented that only three parts are correct. Select these three correct parts :

(a) Cotyledon, Testa, Plumule

(b) Cotyledon, Plumule, Radicle

(c) Cotyledon, Tegmen, Radicle

(d) Cotyledon, Micropyle, Plumule

Concept: Asexual Reproduction in Plant
Chapter: [0.022000000000000002] Reproduction
[1]27

The correct sequencing of angle of incidence, angle of emergence, angle of refraction and lateral displacement shown in the following diagram by digits 1, 2, 3 and 4 is:

(a) 2, 4, 1, 3
(b) 2, 1, 4, 3
(c) 1, 2, 4, 3
(d) 2, 1, 3, 4

Concept: Atmospheric Refraction
Chapter: [0.03] Natural Phenomena
[1]28

In the following diagram the correctly marked angles are : 

(a) ∠A and ∠e

(b) ∠i, ∠A and ∠D

(c) ∠A ∠r and ∠e

(b) ∠A ∠r and ∠D

Concept: Dispersion of White Light Through Prism
Chapter: [0.03] Natural Phenomena
[1]29

If you focus the image of a distant object, whose shape is given below, on a screen using a convex lens, the shape of the image of this object on the screen would be:

(a)

(b)

(c)

(d)

Concept: Convex Lens
Chapter: [0.03] Natural Phenomena
[1]30

Three students A, B and C focussed a distant building on a screen with the help of a concave mirror. To determine focal length of the concave mirror they measured the distances as given below:
Student A : From mirror to the screen
Student B : From building to the screen
Student C : From building to the mirror
Who measured the focal length correctly ;
(a) Only A
(b) Only B
(c) A and B
(d) B and C

Concept: Concave Mirror
Chapter: [0.03] Natural Phenomena
[1]31

For preparing soap in the laboratory we require an oil and a base. Which of the following combinations of an oil and a base would be best suited for the preparation of soap?

(a) Castor oil and calcium hydroxide

(b) Turpentine oil and sodium hydroxide

(c) Castor oil and sodium hydroxide

(d) Mustard oil and calcium hydroxide

Concept: Ethanoic Acid
Chapter: [0.011000000000000001] Carbon Compounds
[1]32

A student took four test tubes P, Q, R and S and filled about 8 mL of distilled water in each. After that he dissolved an equal amount of Na2SO4 in P, K2SO4 in Q, CaSO4 in R and MgSO4 in S. On adding an equal amount of soap solution and shaking each test tube well, a good amount of lather will be obtained in the test tubes:

(a) P and Q
(b) P and R
(c) P, Q and S
(d) Q, R and S

Concept: Soap
Chapter: [0.011000000000000001] Carbon Compounds
[1]33

You have four test tubes, A, B, C and D containing sodium carbonate, sodium chloride, lime water and blue litmus solutions respectively. Out of these the material of which test tube/ test tubes would be suitable for the correct test of acetic/ethanoic acid?

(a) only A
(b) A and B
(c) B and C
(d) A and D

Concept: Ethanoic Acid
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
[2]35

A gas is liberated immediately with a brisk effervescence, when you add acetic acid to sodium hydrogen carbonate powder in a test tube. Name the gas and describe the test that confirms the identity of the gas. 

Concept: Ethanoic Acid
Chapter: [0.011000000000000001] Carbon Compounds
[2]36

Name the type of asexual reproduction in which two individuals are formed from a single parent and the parental identity is lost. Draw the initial and the final stages of this type of reproduction. State the event with which this reproduction starts.

Concept: Asexual Reproduction in Plant
Chapter: [0.022000000000000002] Reproduction
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