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Science Delhi Set 3 2014-2015 CBSE Class 10 Question Paper Solution

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Science [Delhi Set 3]
Marks: 90Date: 2014-2015 March

[1]1

Write the name and formula of the 2nd member of homologous series having general formula CnH2n – 2.

Concept: Versatile Nature of Carbon - Homologous Series
Chapter: [1.01] Carbon Compounds
[1]2

Explain the following:- Speciation

Concept: Speciation
Chapter: [2.01] Heredity and Evolution

List four factors responsible for speciation.

Concept: Speciation
Chapter: [2.01] Heredity and Evolution
[1]3

Why should biodegradable and non-biodegradable wastes be discarded in two separate dustbins?

Concept: Biodegradable and Non-biodegradable Substances
Chapter: [5.02] Our Environment
[2]4

List four specific characteristics of the images of the objects formed by convex mirrors.

Concept: Reflection of Light - Image Formation by Spherical Mirrors - Concave Mirror
Chapter: [3] Natural Phenomena
[2]5

List two advantages associated with water harvesting at the community level.

Concept: Natural Resources - Water for All - Water Harvesting
Chapter: [5.01] Management of Natural Resources
[2]6

Everyone of us can do something to reduce our personal consumption of various natural resources. List four such activities based on 3-R approach.

Concept: Natural Resources - Conservation and Judicious Use of Natural Resources
Chapter: [5.01] Management of Natural Resources
[3]7

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: Important Carbon Compounds - Ethanol
Chapter: [1.01] Carbon Compounds
[3]8

With the help of an example, explain the process of hydrogenation. Mention the essential conditions for the reaction and state the change in physical property with the formation of the product.

Concept: Chemical Properties of Carbon Compounds - Addition Reaction
Chapter: [1.01] Carbon Compounds
[3]9

From the following elements :

4Be; 9F; 19K; 20Ca

(i) Select the element having one electron is the outermost shell.

(ii) two elements of the same group.

Write the formula of and mention the nature of the compound formed by the union of 19K and element X(2, 8, 7).

Concept: Position of Elements and Trends in the Modern Periodic Table
Chapter: [1.03] Periodic Classification of Elements
[3]10

Write the number of periods the Modern Periodic Table has. State the changes in valency and metallic character of elements as we move from left to right in a period. Also state the changes, if any, in the valency and atomic size of elements as we move down a group.

Concept: Position of Elements and Trends in the Modern Periodic Table
Chapter: [1.03] Periodic Classification of Elements
[3]11

List any four methods of contraception used by humans. State in brief two advantages of adopting such preventive methods.

Concept: Reproduction in Human Beings
Chapter: [2.02] Reproduction
[3]12
[2]12.1

Name the following : Thread like non-reproductive structures present in Rhizopus.

Concept: Reproduction - Modes of Reproduction Used by Multicellular Organisms - Spore Formation
Chapter: [2.02] Reproduction

Name the following : 'Blobs' that develop at the tips of the non-reproductive threads in Rhizopus.

Concept: Reproduction - Modes of Reproduction Used by Multicellular Organisms - Spore Formation
Chapter: [2.02] Reproduction
[1]12.2

Explain how non-reproductive structures protect themselves and what is the function of the structures released from the 'blobs' in Rhizopus.

Concept: Reproduction - Modes of Reproduction Used by Multicellular Organisms - Spore Formation
Chapter: [2.02] Reproduction
[3]13

Name the parts A, B and C shown in the diagram and write their functions.

Concept: Sexual Reproduction in Flowering Plants
Chapter: [2.02] Reproduction
[3]14

Planaria, insects, octopus and vertebrates all have eyes. Can we group eyes of these animals together to establish a common evolutionary origin? Justify your answer.

Concept: Evolution by Stages
Chapter: [2.01] Heredity and Evolution

"Birds have evolved from reptiles" State evidence to prove the statement.

Concept: Evolution by Stages
Chapter: [2.01] Heredity and Evolution
[3]15

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

Concept: Evolution - Acquired and Inherited Traits
Chapter: [2.01] Heredity and Evolution
[3]16

To construct ray diagrams, two rays of light are generally so chosen that it is easy to determine their directions after reflection from a mirror. Choose two such rays and state the path/direction of these rays after reflection from a concave mirror. Use these two rays to find the position and nature of the image of an object placed at a distance of 8 cm from a concave mirror of focal length 12 cm.

Concept: Representation of Images Formed by Spherical Mirrors Using Ray Diagrams - Concave Mirror
Chapter: [3] Natural Phenomena
[3]17

With the help of a labelled diagram, explain why the sun appears reddish at the sun-rise and the sun-set.

Concept: Some Natural Phenomena Due to Sunlight
Chapter: [3] Natural Phenomena
[3]18

After the examinations Rakesh with his friends went on a picnic to a nearby park. All friends carried cooked food packed in plastic bags or plastic cans. After eating the food some friends collected the leftover food and plastic bags etc and planned to dispose them off by burning. Rakesh immediately checked them and suggested to segregate the leftover food and peels of fruits from the plastic materials and respectively dispose them off separately in the green and red dustbins placed in the corner of the park.

(a) In your opinion, is burning plastic an ecofriendly method of waste disposal? Why? State the advantage of method suggested by Rakesh.

(b) How can we contribute in maintaining the parks and roads neat and clean?

Concept: Biodegradable and Non-biodegradable Substances
Chapter: [5.02] Our Environment
[5]19

"A convex lens can form a magnified erect as well as magnified inverted image of an object placed in front of it." Draw ray diagram to justify this statement stating the position of the object with respect to the lens in each case.

Concept: Refraction of Light - Image Formation in Lenses Using Ray Diagrams - Convex Lens
Chapter: [3] Natural Phenomena

An object of height 4 cm is placed at a distance of 20 cm from a concave lens of focal length 10 cm. Use lens formula to determine the position of the image formed.

Concept: Lens Formula and Magnification
Chapter: [3] Natural Phenomena
[5]20
[3]20.1

State the laws of refraction of light. 

Concept: Refraction of Light - Refraction Through a Rectangular Glass Slab
Chapter: [3] Natural Phenomena

Explain the term absolute refractive index of a medium and write an expression to relate it with the speed of light in vacuum.

Concept: Refraction of Light - Refraction Through a Rectangular Glass Slab
Chapter: [3] Natural Phenomena
[2]20.2

The absolute refractive indices of two media 'A' and 'B' are 2.0 and 1.5 respectively. If the speed of light in medium 'B' is 2 × 108 m/s, calculate the speed of light in:

(i) vacuum,

(ii) medium 'A'.

Concept: Refraction of Light - Refractive Index
Chapter: [3] Natural Phenomena
[5]21

A student is unable to see clearly the words written on the blackboard placed at a distance of approximately 4 m from him. Name the defect of vision the boy is suffering from. Explain the method of correcting this defect.

Draw ray diagram for the:-

(i) defect of vision and also

(ii) for its correction.

Concept: Defects of Vision and Their Correction
Chapter: [3] Natural Phenomena
[5]22

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

(i) Ovary

(ii) Oviduct

(iii) Uterus

Concept: Reproduction in Human Beings
Chapter: [2.02] Reproduction

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

Concept: Reproduction in Human Beings
Chapter: [2.02] Reproduction
[5]23

How many pairs of chromosomes are present in human beings? Out of these how many are sex chromosomes ? How many types of sex chromosomes are found in human beings?

Concept: Reproduction in Human Beings
Chapter: [2.02] Reproduction

"The sex of a newborn child is a matter of chance and none of the parents may be considered responsible for it". Draw a flow chart showing determination of sex of a newborn to justify this statement.

Concept: Sex Determination - Sex Determination in Humans
Chapter: [2.01] Heredity and Evolution
[5]24

Explain why carbon forms compounds mainly by covalent bond.

Concept: Bonding in Carbon - Covalent Bond
Chapter: [1.01] Carbon Compounds

Explain in brief two main reasons for carbon forming a large number of compounds.

Concept: Versatile Nature of Carbon - Saturated and Unsaturated Carbon Compounds
Chapter: [1.01] Carbon Compounds

Why does carbon form strong bonds with most other elements ?

Concept: Versatile Nature of Carbon - Saturated and Unsaturated Carbon Compounds
Chapter: [1.01] Carbon Compounds
[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: Evolution and Classification - Tracing Evolutionary Relationships
Chapter: [2.01] Heredity and Evolution
[1]26

A student identified the various parts of an embryo of a gram seed and listed them as given below :

(I) Testa

(II) Plumule

(III) Radicle

(IV) Cotyledon

(V) Tegmen

Out of these the actual parts of the embryo are :

(A) I, II, III

(B) II, III, IV

(C) III, IV, V

(D) II, IV, V

Concept: Sexual Reproduction in Flowering Plants
Chapter: [2.02] Reproduction
[1]27

A student has obtained a point image of a distant object using the given convex lens. To find the focal length of the lens he should measure the distance between the :

(A) lens and the object only

(B) lens and the screen only

(C) object and the image only

(D) lens and the object and also between the object and the image

Concept: Lens Formula and Magnification
Chapter: [3] Natural Phenomena
[1]28

Study the following diagram and select the correct statement about the device 'X' :

(A) Device 'X' is a concave mirror of radius of curvature 12 cm

(B) Device 'X' is a concave mirror of focal length 6 cm

(C) Device 'X' is a concave mirror of focal length 12 cm

(D) Device 'X' is a convex of mirror of focal length 12 cm

Concept: Reflection of Light - Image Formation by Spherical Mirrors - Concave Mirror
Chapter: [3] Natural Phenomena
[1]29

After tracing the path of a ray of light through a glass prism a student marked the angle of incidence (∠i), angle of refraction (∠r) angle of emergence (∠e) and the angle of deviation (∠D) as shown in the diagram. The correctly marked angles are :

(A) ∠i and ∠r

(B) ∠i and ∠e

(C) ∠i, ∠e and ∠D

(D) ∠i, ∠r and ∠e

Concept: Dispersion by a Prism
Chapter: [3] Natural Phenomena
[1]30

Four students P, Q, R and S traced the path of a ray of light passing through a glass slab for an angle of incidence 40° and measured the angle of refraction. The values as measured them were 18°; 22°; 25° and 30° respectively. The student who has performed the experiment methodically is

(A) P

(B) Q

(C) R

(D) S

Concept: Refraction of Light - Refraction Through a Rectangular Glass Slab
Chapter: [3] Natural Phenomena
[1]31

Hard water is not available for an experiment. Some salts are given below :

(I) Sodium chloride

(II) Sodium sulphate

(III) Calcium chloride

(IV) Calcium sulphate

(V) Potassium chloride

(VI) Magnesium sulphate

Select from the following group of these salts, each member of which may be dissolved in water to make it hard.

(A) I, II, V

(B) I, III, V

(C) III, IV, VI

(D) II, IV, VI

Concept: Soaps and Detergents
Chapter: [1.01] Carbon Compounds
[1]32

A student Prepared 20% sodium hydroxide solution in a beaker to study saponification reaction. Some observations related to this are given below :

(I) Sodium hydroxide solution turns red litmus blue

(II) Sodium hydroxide readily dissolves in water

(III) The beaker containing solution appears cold when touched from outside

(IV) The blue litmus paper turns red when dipped into the solution

The correct observations are :-

(A) I, II and IV

(B) I, II and III

(C) only III and IV

(D) only I and II

Concept: Chemicals from Common Salt - Sodium Hydroxide
Chapter: [1.04] Acids, Bases and Salts
[1]33

A student adds 2 mL of acetic acid to a test tube containing 2 mL of distilled water. He then shakes the test tube well and leaves it to settle for some time. After about 5 minutes he observes that in the test tube there is :

(A) a clear transparent colourless solution

(B) a clear transparent pink solution

(C) a precipitate settling at the bottom of the test tube

(D) a layer of water the layer of acetic acid

Concept: Important Carbon Compounds - Ethanoic Acid (Acetic acid)
Chapter: [1.01] Carbon Compounds
[2]34

To find the image-distance for varying object-distances in case of a convex lens, a student obtains on a screen a sharp image of a bright object placed very far from the lens. After that he gradually moves the object towards the lens and each time focuses its image of the screen.

(a) In which direction – towards or away from the lens, does he move the screen to focus the object?

(b) What happens to the size of image – does it increase or decrease?

(c) What happen when he moves the object very close to the lens?

Concept: Refraction of Light - Image Formation by Lenses - Convex Lens
Chapter: [3] Natural Phenomena
[2]35

When you add sodium hydrogen carbonate to acetic acid in a test tube, a gas liberates immediately with brisk effervescence. Name this gas. Describe the method of testing this gas.

Concept: Chemicals from Common Salt - Baking Soda
Chapter: [1.04] Acids, Bases and Salts
[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: Reproduction - Modes of Reproduction Used by Single Organisms - Fission
Chapter: [2.02] Reproduction

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