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# Science Delhi Set 1 2016-2017 CBSE (English Medium) Class 10 Question Paper Solution

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Science [Delhi Set 1]
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 first two members of homologous series having functional group -Cl.

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

Name the method by which Spirogyra reproduces under favourable conditions. Is this method sexual or asexual?

Concept: Asexual Reproduction - Asexual Reproduction in Plant
Chapter: [0.08] How do Organisms Reproduce?
[1] 3

What is an ecosystem ?

Concept: Ecosystem
Chapter: [0.15] Our Environment
[2] 4

An object is placed at a distance of 30 cm in front of a convex mirror of focal length 15 cm. Write four characteristics of the image formed by the mirror.

Concept: Convex Mirror
Chapter: [0.1] Light - Reflection and Refraction
[2] 5

What is meant by "sustainable management"?

Concept: Conservation of Forest
Chapter: [0.16] Sustainable 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: [0.16] Sustainable Management of Natural Resources
[2] 6

Management of forest and wild life resources is a very challenging task. Why? Give any two reasons.

Concept: Overview of Natural Resource Management
Chapter: [0.16] Sustainable Management of Natural Resources
[3] 7

Two carbon compounds X and Y have the molecular formula C4H8 and C5H12 respectively. Which one of these is most likely to show addition reaction? Justify your answer. Also give the chemical equation to explain the process of addition in this case.

Concept: Chemical Properties of Carbon Compound
Chapter: [0.04] Carbon and its Compounds
[3] 8

Complete the following chemical equations:CH3COOC2H5+NaOH→

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

Complete the following chemical equations :CH3COOH+NaOH→

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

Complete the following chemical equations:

C2H5OH+CH3COOH("conc."H_2SO_4)/>

Concept: Ethanoic Acid
Chapter: [0.04] Carbon and its 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: [0.05] 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: History of Periodic Table: Early Attempts at the Classification of Elements
Chapter: [0.05] Periodic Classification of Elements
[3] 11

What happens when a Planaria gets cut into two pieces?

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

What happens when Bryophyllum leaf falls on the wet soil?

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

What happens when On maturation sporangia of Rhizopus bursts?

Concept: Asexual Reproduction - Asexual Reproduction in Plant
Chapter: [0.08] How do Organisms Reproduce?
[3] 12

State the basic requirement for sexual reproduction?

Concept: Sexual Reproduction in Animals
Chapter: [0.08] How do Organisms Reproduce?

Write the importance of sexual reproduction in nature.

Concept: Sexual Reproduction in Animals
Chapter: [0.08] How do Organisms Reproduce?
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[3] 13

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

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

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

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

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

Concept: Evolution
Chapter: [0.09] Heredity and Evolution
[3] 15

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

Homologous organs

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

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

Analogous organs

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

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

Fossils

Concept: Evidence of Organic Evolution
Chapter: [0.09] Heredity and Evolution
[3] 16

An object 4 cm in height, is placed at 15 cm in front of a concave mirror of focal length 10 cm. At what distance from the mirror should a screen be placed to obtain a sharp image of the object. Calculate the height of the image.

Concept: Concave Mirror
Chapter: [0.1] Light - Reflection and Refraction
[3] 17

Due to gradual weakening of ciliary muscles and diminishing flexibility of the eye lens a certain defect of vision arises. Write the name of this defect. Name the type of lens required by such persons to improve the vision. Explain the structure and function of such a lens.

Concept: Concave Lens
Chapter: [0.1] Light - Reflection and Refraction
[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: [0.15] Our Environment
[5] 19

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

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

Describe in brief the cleansing action of soap.

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

Why do soaps not form lather in hard water?

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

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

Concept: Soap
Chapter: [0.04] Carbon and its Compounds
[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: [0.08] How do Organisms Reproduce?

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: [0.08] How do Organisms Reproduce?

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

Concept: Human Reproductive System
Chapter: [0.08] How do Organisms Reproduce?
[5] 21

How did Mendel interpret his results to show that traits may be dominant or recessive? Describe briefly.

Concept: Heredity
Chapter: [0.09] Heredity and Evolution

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

Concept: Heredity
Chapter: [0.09] Heredity and Evolution
[5] 22

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: [0.1] Light - Reflection and Refraction
[5] 23

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: [0.1] Light - Reflection and Refraction

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: [0.1] Light - Reflection and Refraction
[5] 24

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

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

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

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

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: [0.11] The Human Eye and the Colourful World
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[1] 25

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: [0.04] Carbon and its Compounds
[1] 26

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: [0.04] Carbon and its Compounds
[1] 27

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: [0.04] Carbon and its Compounds
[1] 28

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 - Asexual Reproduction in Plant
Chapter: [0.08] How do Organisms Reproduce?
[1] 29

Which of the following is a correct set of homologous organs?

(a) Forelimbs of frog, bird and lizard

(b) Spine of cactus and thorn of bougainvillea

(c) Wings of bat and wings of butterfly

(d) Wings of a bird and wings of a bat

Concept: Evidence of Organic Evolution
Chapter: [0.09] Heredity and Evolution
[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: [0.1] Light - Reflection and Refraction
[1] 31

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: [0.1] Light - Reflection and Refraction
[1] 32

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 Light Through Prism and Formation of Spectrum
Chapter: [0.11] The Human Eye and the Colourful World
[1] 33

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: [0.11] The Human Eye and the Colourful World
[2] 34

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: [0.04] Carbon and its Compounds
[2] 35

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 - Asexual Reproduction in Plant
Chapter: [0.08] How do Organisms Reproduce?
[2] 36

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

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