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Science Delhi Set 1 2012-2013 CBSE (English Medium) Class 10 Question Paper Solution

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Science [Delhi Set 1]
Marks: 90 Academic Year: 2012-2013
Date: March 2013
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[1] 1

Write the number of vertical columns in the modern periodic table. What are these columns called?

Concept: Periodic Properties
Chapter: [0.05] Periodic Classification of Elements
[1] 2

Explain the following:- Speciation

Concept: Speciation
Chapter: [0.09] Heredity and Evolution
[1] 3

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

Concept: Waste Separation Exercise
Chapter: [0.15] Our Environment
[2] 4

“The chromosomes number of the sexually reproducing parents and their offspring is the same.” Justify this statement. 

Concept: Sexual Reproduction in Animals
Chapter: [0.08] How do Organisms Reproduce?
[2] 5

“A ray of light incident on a rectangular glass slab immersed in any medium emerges parallel to itself.” Draw labelled ray diagram to justify the statement. 


Concept: Refraction of Light Through a Rectangular Glass Slab
Chapter: [0.1] Light - Reflection and Refraction
[2] 6

We often observe domestic waste decomposing in the bylanes of our homes. List four ways to make the residents aware that the improper disposal of wastes is harmful to the environment and also for their own health.

Concept: Waste and Its Categories
Chapter: [0.15] Our Environment
[2] 7

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

Concept: Water Management (Conservation of Water) - Fresh Water Management
Chapter: [0.16] Sustainable Management of Natural Resources
[3] 8

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: Ethanol
Chapter: [0.04] Carbon and its Compounds
[3] 9

Why homologous series of carbon compounds are so called? Write chemical formula of two consecutive members of a homologous series and state the part of these compounds that determines their (i) physical properties, and (ii) chemical properties.

Concept: Homologous Series of Carbon Compound
Chapter: [0.04] Carbon and its Compounds
[3] 10

Given below are some elements of the modern periodic table. Atomic number of the element is given in parentheses.

A(4), B(9), C(14), D(19), E(20)

(a) Select the element that has one electron in the outermost shell. Also, write the electronic configuration of this element.

(b) Which two elements amongst these belong to the same group? Give reasons for your answer.

(c) Which two elements amongst these belong to the same period? Which one of the two has bigger atomic radius?

Concept: Periodic Properties
Chapter: [0.05] Periodic Classification of Elements
[3] 11

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: Periodic Properties
Chapter: [0.05] Periodic Classification of Elements
[3] 12

Explain the process of regeneration in Planaria.

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

How the process of regeneration in Planaria process different from reproduction?

Concept: Asexual Reproduction in Plant
Chapter: [0.08] How do Organisms Reproduce?
[3] 13

Write two examples of sexually transmitted diseases caused by virus.

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

Write two examples of sexually transmitted diseases caused by bacteri.

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

Explain how the transmission of virus and bacteria diseases be prevented?

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
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[3] 15

"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
Chapter: [0.09] Heredity and Evolution
[3] 16

Mention the types of mirrors used as (i) rear view mirrors, (ii) shaving mirrors. List two reasons to justify your answers in each case.

Concept: Spherical Mirrors
Chapter: [0.1] Light - Reflection and Refraction
[3] 17

An object of height 6 cm is placed perpendicular to the principal axis of a concave lens of focal length 5 cm. Use lens formula to determine the position, size and nature of the image if the distance of the object from the lens is 10 cm. 

Concept: Magnification Due to Spherical Lenses
Chapter: [0.1] Light - Reflection and Refraction
[3] 18

State the difference in colours of the sun observed during sunrise/sunset and noon. Give explanation for each.

Concept: Applications of Scattering of Light
Chapter: [0.11] The Human Eye and the Colourful World
[3] 19

What is an ecosystem ?

Concept: Ecosystem
Chapter: [0.15] Our Environment

List two main components of ecosystem?

Concept: Food Chain
Chapter: [0.15] Our Environment

We do not clean natural ponds or lakes but an aquarium needs to be cleaned regularly. Why is it so ? Explain.

Concept: Food Chain
Chapter: [0.15] Our Environment
[5] 20

Define the term ‘isomers’.

Concept: Nomenclature of Organic Compounds (IUPAC)
Chapter: [0.04] Carbon and its Compounds

Draw two possible isomers of the compound with molecular formula C3H6O and write their names.

Give the electron dot structures of the above two compounds.

 

Concept: Chains, Branches and Rings of Carbon Compound
Chapter: [0.04] Carbon and its Compounds
[5] 21

List three distinguish features between sexual and asexual types of reproduction, in tabular form.

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

Explain why variations are observed in the offsprings of sexually reproducing organisms?

Concept: Sexual Reproduction in Animals
Chapter: [0.08] How do Organisms Reproduce?
[5] 22

(a) Identify A, B and C in the given diagram and write their functions.

(b) Mention the role of gamete and zygote in sexually reproducing organisms.

Concept: Sexual Reproduction in Flowering Plants
Chapter: [0.08] How do Organisms Reproduce?
[5] 23

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

Concept: Refractive Index
Chapter: [0.1] Light - Reflection and Refraction

The refractive indices of water and glass with respect to air are 4/3 and 3/2 respectively. If the speed of light in glass is 2 × 108ms−1, find the speed of light in (i) air, (ii) water.

Concept: Refractive Index
Chapter: [0.1] Light - Reflection and Refraction
[5] 24

A person cannot read newspaper placed nearer than 50 cm from his eyes. Name the defect of vision he is suffering from. Draw a ray diagram to illustrate this defect. List its two possible causes. Draw a ray diagram to show how this defect may be corrected using a lens of appropriate focal length.

Concept: Eye Defect and Its Correction: Myopia Or Near-sightedness
Chapter: [0.11] The Human Eye and the Colourful World

We see advertisements for eye donation on television or in newspapers. Write the importance of such advertisements.

Concept: Human Eye: Structure of the Eye
Chapter: [0.11] The Human Eye and the Colourful World
[1] 25

A student takes 2 mL acetic acid in a dry test tube and adds a pinch of sodium hydrogen carbonate to it. He makes the following observations:

I. A colourless and odourless gas evolves with a brisk effervescence.

II. The gas turns lime water milky when passed through it.

III. The gas burns with an explosion when a burning splinter is brought near it.

IV. The gas extinguishes the burning splinter that is brought near it.

The correct observations are:

(A) I, II, and III

(B) II, III and IV

(C) III, IV and I

(D) IV, I and II

Concept: Ethanoic Acid
Chapter: [0.04] Carbon and its Compounds
[1] 26

In an experiment to study the properties of acetic acid a student takes about 2 mL of acetic acid in a dry test tube. He adds about 2 mL of water to it and shakes the test tube well. He is likely to observe that:

(A) the acetic acid dissolves readily in water

(B) the solution becomes light orange

(C) water floats over the surface of acetic acid

(D) acetic acid floats over the surface of water

Concept: Ethanoic Acid
Chapter: [0.04] Carbon and its Compounds
[1] 27

A student prepared 20% sodium hydroxide solution in a beaker containing water. The observations noted by him are given below. 

I. Sodium hydroxide is in the form of pellets.

II. It dissolves in water readily.

III. The beaker appears cold when touched from outside.

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

The correct observations are:

(A) I, II, and III

(B) II, III and IV

(C) III, IV and I

(D) I, II and IV

Concept: Chemicals from Common Salt (Uses of Salt) - Preparation and Uses of Sodium Hydroxide
Chapter: [0.02] Acids, Bases and Salts
[1] 28

Read the following statements: 

I. When a red litmus paper is dipped into reaction mixture of a saponification reaction, it turns blue and the reaction is exothermic.

II. When a blue litmus paper is dipped into reaction mixture of a saponification reaction, its colour does not change and the reaction is exothermic.

III. When a red litmus paper is dipped into reaction mixture of a saponification reaction, its colour does not change and the reaction is endothermic.

IV. When a blue litmus paper is dipped into reaction mixture of a saponification reaction, its colour does not change and the reaction is endothermic.

Which of the above statements are correct:

(A) I, and II

(B) II and III

(C) III and IV

(D) I and IV

Concept: Properties of Acids
Chapter: [0.02] Acids, Bases and Salts
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[1] 29

Hard water required for an experiment is not available in a school laboratory. However, following salts are available in the laboratory. Select the salts which may be dissolved in water to make it hard for the experiment.

(1)

Calcium Sulphate

(2)

Sodium Sulphate

(3)

Calcium Chloride

(4)

Potassium Sulphate

(5)

Sodium Hydrogen Carbonate

(6)

Magnesium Chloride

(A) 1, 2 and 4

(B) 1, 3 and 6

(C) 3, 5 and 6

(D) 2, 4 and 5

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

A student focussed the image of a distant object using a device ‘X’ on a white screen ‘S’ as shown in the figure. If the distance of the screen from the device is 40 cm, select the correct statement about the device.

(A) The device X is a convex lens of focal length 20 cm.

(B) The device X is a concave mirror of focal length 40 cm.

(C) The device X is a convex mirror of radius of curvature 40 cm.

(D) The device X is a convex lens of focal length 40 cm.

Concept: Convex Lens
Chapter: [0.1] Light - Reflection and Refraction
[1] 31

A student obtained a sharp image of a burning candle, placed at the farther end of a laboratory table, on a screen using a concave mirror. For getting better value of focal length of the mirror, the subject teacher suggested him for focusing a well illuminated distant object. What should the student do?

(A) He should move the mirror away from the screen.

(B) He should move the mirror slightly towards the screen.

(C) He should move the mirror as well as the screen towards the newly selected object.

(D) He should move only the screen towards the newly selected object.

Concept: Spherical Mirrors
Chapter: [0.1] Light - Reflection and Refraction
[1] 32

After tracing the path of rays of light through a glass slab for three different angles of incidence, a student measured the corresponding values angle of refraction r and angle of emergence e and recorded them in the table given below: 

S. No.

i

i

e

I

30°

20°

31°

II

40°

25°

40°

III

50°

31°

49°

The correct observations are:

(A) I and II

(B) II and III

(C) I and III

(D) I, II and III

Concept: Refraction of Light Through a Rectangular Glass Slab
Chapter: [0.1] Light - Reflection and Refraction
[1] 33

Select from the following the best set-up for tracing the path of a ray of light through a rectangular 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] 34

While performing the experiment to trace the path of a ray of light passing through a glass prism, four students marked the incident ray and the emergent ray in their diagrams in the manner shown below. 

(A) I

(B) II

(C) III

(D) IV

Concept: Dispersion of Light Through Prism and Formation of Spectrum
Chapter: [0.11] The Human Eye and the Colourful World
[1] 35

In an experiment to trace the path of a ray of light through a glass prism for different values of angle of incidence a student would find that the emergent ray: 

(A) is parallel to the incident ray

(B) perpendicular to the incident ray

(C) is parallel to the refracted ray

(D) bends at an angle to the direction of incident ray

Concept: Dispersion of Light Through Prism and Formation of Spectrum
Chapter: [0.11] The Human Eye and the Colourful World
[1] 36

The diagrams showing the correct path of the ray after passing through the lens are:

I II
III IV

II and III only

I and II only

I, II and III

I, II and IV

Concept: Concave Lens
Chapter: [0.1] Light - Reflection and Refraction
[1] 37

Out of the five incident rays shown in the figure find the three rays that are obeying the laws of refraction and may be used for locating the position of image formed by a convex lens:

(A) 1, 2 and 3

(B) 2, 3 and 4

(C) 3, 4 and 5

(D) 1, 2 and 4

Concept: Convex Lens
Chapter: [0.1] Light - Reflection and Refraction
[1] 38

A student after observing a slide showing different stages of binary fission in Amoeba draws the following diagrams. However these diagrams are not in proper sequence:

The correct sequence is:

(A) I, V, IV, III, II

(B) I, III, IV, V, II

(C) I, V, III, IV, II

(D) I, IV, V, III, II

Concept: Asexual Reproduction in Plant
Chapter: [0.08] How do Organisms Reproduce?
[1] 39

Select the correct statements for the process of budding in yeast:

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

II. A parent cell divides into two daughter cells, here the parental identity is lost.

III. Before detaching from the parent body a bud may form another bud.

IV. A bud when detaches from the parent body grows into a new individual.

(A) I, II and III

(B) II, III and IV

(C) III, IV and I

(D) IV, I and II

Concept: Asexual Reproduction in Plant
Chapter: [0.08] How do Organisms Reproduce?
[1] 40

Study the different conclusions drawn by students of a class on the basis of observations of preserved/available specimens of plants and animals.

I. Potato and sweet potato are analogous organs in plants.

II. Wings of insects and wings of birds are homologous organs in animals.

III. Wings of insects and wings of bats are analogous organs in animals.

IV. Thorns of citrus and tendrils of cucurbita are analogous organs in plants.

The correct conclusions are:

(A) I, and II

(B) II and IV

(C) I and III

(D) III and IV

Concept: Homologous Series of Carbon Compound
Chapter: [0.04] Carbon and its Compounds
[1] 41

You have potato, carrot, radish, sweet potato, tomato and ginger bought from the market in your jute bag. Identify two vegetables to represent the correct homologous structures.

(A) Potato and tomato

(B) Carrot and tomato

(C) Potato and sweet potato

(D) Carrot and radish

Concept: Evidence of Organic Evolution
Chapter: [0.09] Heredity and Evolution
[1] 42

In the figure, the parts marked A, B and C are sequentially:


(A) Plumule, Radicle and Cotyledon

(B) Radicle, Plumule and Cotyledon

(C) Plumule, Cotyledon and Radicle

(D) Radicle, Cotyledon and Plumule

Concept: Sexual Reproduction in Flowering Plants
Chapter: [0.08] How do Organisms Reproduce?
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CBSE previous year question papers Class 10 Science with solutions 2012 - 2013

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