# Science Delhi Set 3 2016-2017 CBSE Class 10 Question Paper Solution

Science [Delhi Set 3]
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 – OH

Concept: Carbon: a Versatile Element - Homologous Series of Carbon Compound
Chapter: [0.011000000000000001] Carbon Compounds
[1]2

How does Plasmodium reproduce. Is this method sexual or asexual?

Concept: Reproduction in Plant - Modes of Reproduction Used by Single Organisms - Fission
Chapter: [0.022000000000000002] Reproduction
[1]3

Why is a lake considered to be a natural ecosystem?

Concept: Concept of Eco-System
Chapter: [0.052000000000000005] Our Environment
[2]4

An object is placed at a distance of 12 cm in front of a concave mirror of radius of curvature 30 cm. List four characteristics of the image formed by the mirror.

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

How do advantages of exploiting natural resources with short term gains in mind differ from the advantages of managing our resources with a long-term perspective?

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

What is meant by wildlife?

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

How is wildlife important for us?

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

Complete the following chemical equations: C2H5OH+O2

Concept: Ethanoic Acid
Chapter: [0.011000000000000001] Carbon Compounds

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

Concept: Ethanoic Acid
Chapter: [0.011000000000000001] Carbon Compounds

Complete the following chemical equations: CH3COOH+NaHCO3

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

The molecular formula of two carbon compounds are C4H8 and C3H8. 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 [0.011000000000000001] Carbon Compounds [0.011000000000000001] Carbon Compounds [0.011000000000000001] Carbon Compounds
[3]9

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]10

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: Periodic Classification of Elements
Chapter: [0.013000000000000001] Periodic Classification of Elements
[3]11

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

Concept: Rules for the Inheritance of Traits - Mendel’S Contributions
Chapter: [0.021] Heredity and Evolution
[3]12

Explain with an example for the given, how the following provides evidence in favor of evolution in organisms :

Homologous organs

Concept: Evolution and Classification - Tracing Evolutionary Relationships
Chapter: [0.021] Heredity and Evolution

Explain with an example for the given, how the following provides evidence in favor of evolution in organisms :

Analogous organs

Concept: Evolution and Classification - Tracing Evolutionary Relationships
Chapter: [0.021] Heredity and Evolution

Explain with an example for the given, how the following provides evidence in favor of evolution in organisms :

Fossils

Concept: Evolution and Classification - Tracing Evolutionary Relationships
Chapter: [0.021] Heredity and Evolution
[3]13

What happens when a Planaria gets cut into two pieces?

Concept: Reproduction in Plant - Modes of Reproduction Used by Multicellular Organisms - Fragmentation
Chapter: [0.022000000000000002] Reproduction

What happens when On maturation sporangia of Rhizopus bursts?

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

What happens when Bryophyllum leaf falls on the wet soil?

Concept: Reproduction in Plant - Modes of Reproduction Used by Multicellular Organisms - Vegetative Propagation
Chapter: [0.022000000000000002] Reproduction
[3]14

List any four steps involved in sexual reproduction .

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

Advantages of  sexual reproduction.

Concept: Sexual Reproduction in Animals
Chapter: [0.022000000000000002] Reproduction
[3]15

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
[3]16

The image of a candle flame placed at a distance of 30 cm from a mirror is formed on a screen placed in front of the mirror at a distance of 60 cm from its pole. What is the nature of the mirror? Find its focal length. If the height of the flame is 2.4 cm, find the height of its image. State whether the image formed is erect or inverted

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

Define the term: Power of accommodation of the eye.

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

Explain why the image distance in the eye does not change when we change the distance of an object from 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

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

Concept: Rules for the Inheritance of Traits - Mendel’S Contributions
Chapter: [0.021] Heredity and Evolution

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

Concept: Rules for the Inheritance of Traits - Mendel’S Contributions
Chapter: [0.021] Heredity and Evolution
[5]20

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
[5]21

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

Concept: Dispersion by a 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 by a 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: Some Natural Phenomena Due to Sunlight
Chapter: [0.03] Natural Phenomena
[5]22

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 [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 [0.03] 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 −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 [0.03] Natural Phenomena
[5]24

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

Concept: Soap
Chapter: [0.011000000000000001] Carbon Compounds

Describe in brief the cleansing action of soap.

Concept: Soap
Chapter: [0.011000000000000001] Carbon Compounds

Why do soaps not form lather in hard water?

Concept: Soap
Chapter: [0.011000000000000001] Carbon Compounds
[1]25

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]26

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 by a Prism
Chapter: [0.03] Natural Phenomena
[1]27

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 [0.03] Natural Phenomena
[1]28

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 [0.03] Natural Phenomena
[1]29

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]30

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
[1]31

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]32

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: Evolution and Classification - Tracing Evolutionary Relationships
Chapter: [0.021] Heredity and Evolution
[1]33

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: Reproduction in Plant - Modes of Reproduction Used by Multicellular Organisms - Vegetative Propagation
Chapter: [0.022000000000000002] Reproduction
[1]34

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: Reproduction in Plant - Modes of Reproduction Used by Single Organisms - Fission
Chapter: [0.022000000000000002] Reproduction
[1]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: [0.03] Natural Phenomena [0.03] Natural Phenomena
[1]36

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

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