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Science Delhi Set 3 2010-2011 CBSE Class 10 Question Paper Solution

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Science [Delhi Set 3]
Marks: 80Date: 2010-2011 March

[1]1

What are the various steps of food chain called?

Concept: Components of Eco System - Food Chains and Webs
Chapter: [5.02] Our Environment
[1]2

What is the function of ozone in the upper atmosphere?

Concept: Ozone Layer
Chapter: [5.02] Our Environment
[1]3

Write the electron dot structure of ethane molecule, C2H6.

Concept: Versatile Nature of Carbon - Nomenclature of Carbon Compounds
Chapter: [1.01] Carbon Compounds
[1]4

What makes the earth’s atmosphere a heterogeneous mixture?

Concept: Our Environment Questions
Chapter: [5.02] Our Environment
[2]5

List any four characteristics of a good fuel.

Concept: Alternative or Non-conventional Sources of Energy - Nuclear Energy
Chapter: [5.03] Sources of Energy
[2]6

What are non-renewable resources of energy? Give two examples of such resources.

Concept: Renewable Versus Non-renewable Sources
Chapter: [5.03] Sources of Energy
[2]7

How do you calculate the possible valency of an element from the electronic configuration of its atoms?

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

Calculate the valency of element X whose atomic number is 9.

Concept: Position of Elements and Trends in the Modern Periodic Table
Chapter: [1.03] Periodic Classification of Elements
[2]8

On the basis of electronic configuration, how will you identify the first and the last element of a period?

Concept: Position of Elements and Trends in the Modern Periodic Table
Chapter: [1.03] Periodic Classification of Elements
[2]9

State the two laws of reflection of light.

Concept: Velocity of Light
Chapter: [3] Natural Phenomena
[2]10

The stars appear higher from horizon than they actually are. Explain why it is so.

Concept: Atmospheric Refraction
Chapter: [3] Natural Phenomena
[2]11

Explain why the planets do not twinkle but the stars twinkle.

Concept: Atmospheric Refraction
Chapter: [3] Natural Phenomena
[2]12

Write two differences between binary fission and multiple fission in a tabular form.

Concept: Reproduction - Modes of Reproduction Used by Single Organisms - Fission
Chapter: [2.02] Reproduction
[2]13

Why is DNA copying an essential part of the process of reproduction?

Concept: Reproduction - Introduction
Chapter: [2.02] Reproduction
[3]14

Explain the following:- Speciation

Concept: Speciation
Chapter: [2.01] Heredity and Evolution

Explain the following:- Natural Selection

Concept: Basic Concepts of Evolution
Chapter: [2.01] Heredity and Evolution
[3]15

How is the equal genetic contribution of male and female parents ensured in the progeny?

Concept: Rules for the Inheritance of Traits - Mendel’s Contributions
Chapter: [2.01] Heredity and Evolution
[3]16

Out of HCl and CH3COOH, which one is a weak acid and why? Describe an activity to support your answer.

Concept: Concept of Acids, Bases and Salts
Chapter: [1.04] Acids, Bases and Salts
[3]17

Two elements X and Y belong to group 1 and 2 respectively in the same period of periodic table. Compare them with respect to:

(i) the number of valence electrons in their atoms

(ii) their valencies

(iii) metallic character

(iv) the sizes of their atoms

(v) the formulae of their oxides

(vi) the formulae of their chlorides

Concept: Periodic Classification of Elements Questions
Chapter: [1.03] Periodic Classification of Elements
[3]18

Draw the ray diagram and also state the position, the relative size and the nature of image formed by a concave mirror when the object is placed at the centre of curvature of the mirror.

Concept: Reflection of Light - Image Formation by Spherical Mirrors - Concave Mirror
Chapter: [3] Natural Phenomena
[3]19

The refractive index of diamond is 2.42. What is the meaning of this statement?

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

Name a liquid whose mass density is less than that of water but it is optically denser than water.

Concept: Refraction of Light - Refractive Index
Chapter: [3] Natural Phenomena
[3]20

What eye defect is hypermetropia? Describe with a ray diagram how this defect of vision can be corrected by using an appropriate lens.

Concept: Defects of Vision and Their Correction
Chapter: [3] Natural Phenomena
[3]21

Write two examples of sexually transmitted diseases caused by virus.

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

Write two examples of sexually transmitted diseases caused by bacteri.

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

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

Concept: Reproduction in Human Beings
Chapter: [2.02] Reproduction
[3]22

Explain Mendel’s law of independent inheritance. Give one example.

Concept: Rules for the Inheritance of Traits - Mendel’s Contributions
Chapter: [2.01] Heredity and Evolution
[5]23 | Attempt one of the following
[5]23.1

If the image formed by a lens is diminished in size and erect, for all positions of the object, what type of lens is it?

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

Name the point on the lens through which a ray of light passes undeviated.

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

An object is placed perpendicular to the principal axis of a convex lens of focal length 20 cm. The distance of the object from the lens is 30 cm. Find (i) the position (ii) the magnification and (iii) the nature of the image formed.

Concept: Refraction of Light - Image Formation by Lenses - Convex Lens
Chapter: [3] Natural Phenomena
[5]23.2

One-half of a convex lens is covered with a black paper. Will this lens produce a complete image of the object? Verify your answer experimentally. Explain your observations.

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

An object 5 cm high is held 25 cm away from a converging lens of focal length 10 cm.

(i) Draw the ray diagram and

(ii) Calculate the position and size of the image formed.

(iii) What is the nature of the image?

Concept: Refraction of Light - Sign Convention for Spherical Lenses
Chapter: [3] Natural Phenomena
[5]24 | Attempt one of the following
[5]24.1

Draw a diagram of the longitudinal section of a flower and label on it sepal, petal, ovary and stigma.

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

Write the names of male and female reproductive parts of a flower.

Concept: Sexual Reproduction in Flowering Plants
Chapter: [2.02] Reproduction
[5]24.2

What is fragmentation in organisms?

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

Name a multicellular organism which reproduces by fragmentation method.

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

What is regeneration in organism?

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

Describe regeneration in Planaria with the help of a suitable diagram.

Concept: Reproduction - Modes of Reproduction Used by Multicellular Organisms - Regeneration
Chapter: [2.02] Reproduction
[5]25 | Attempt one of the following
[5]25.1

In a tabular form, differentiate between ethanol and ethanoic acid under the following heads:

(i) Physical state

(ii) Taste

(iii) NaHCO3 test

(iv) Ester test

Concept: Important Carbon Compounds - Ethanol
Chapter: [1.01] Carbon Compounds

Write a chemical reaction to show the dehydration of ethanol.

Concept: Important Carbon Compounds - Ethanol
Chapter: [1.01] Carbon Compounds
[5]25.2

What is a soap?

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

Why are soaps not suitable for washing clothes when the water is hard?

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

Explain the action of soap in removing an oily spot from a piece of cloth.

Concept: Soaps and Detergents
Chapter: [1.01] Carbon Compounds
[1]26

A student was given two permanent slides, one of binary fission in Amoeba and other of budding in yeast. He was asked to identify any one difference in the nucleus of the two. One such difference, he identified correctly was

(1) Presence of one nucleus in Amoeba, two in yeast cell and one in bud. 

(2) Presence of two nuclei in centrally constricted Amoeba, one in yeast cell and one in its bud.

(3) Presence of two distant nuclei in Amoeba, one in yeast cell and two in bud.

(4) Presence of a single nucleus each in Amoeba, yeast cell and its attached bud.

Concept: Reproduction - Modes of Reproduction Used by Single Organisms - Fission
Chapter: [2.02] Reproduction
[1]27

Binary fission is observed in which one of the following figures?

Concept: Reproduction - Modes of Reproduction Used by Single Organisms - Fission
Chapter: [2.02] Reproduction
[1]28

To determine the percentage of water absorbed by raisins, raisins are soaked in water for: 

(1) 30 seconds

(2) 10 minutes

(3) 2 to 3 hours 

(4) 24 hours

Concept: Concept of Transportation
Chapter: [2.04] Life Processes
[1]29

Raisins are wiped off gently before final weighing with help of

(1) a filter paper

(2) a cotton piece

(3) a cloth piece

(4) a polythene piece

Concept: Concept of Transportation
Chapter: [2.04] Life Processes
[1]30

The step(s) necessary for determining the percentage of water absorbed by raisins is/are:

(1) Raisins should be completely immersed in water 

(2) Raisins should be soaked in water for sufficient time

(3) Gently wipe dry the soaked raisins

(4) All of the above steps. 

Concept: Concept of Transportation
Chapter: [2.04] Life Processes
[1]31

Rahim recorded the following sets of observations while tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence.

S. No.

Angle of incidence

Angle of refraction

Angle of emergence

I

45°

41°

45°

II

40°

38°

38°

III

45°

41°

40°

IV

41°

45°

41°

The correct observation is recorded at serial number: 

(1) I

(2) II 

(3) III 

(4) IV 

Concept: Refraction of Light - Refraction Through a Rectangular Glass Slab
Chapter: [3] Natural Phenomena
[1]32

Four students A, B, C and D traced the paths of incident ray and the emergent ray by fixing pins P and Q for incident ray and pins R and S for emergent ray for a ray of light passing through a glass slab.

The correct emergent ray was traced by the student: 

(1) A

(2) B

(3) C

(4) D

Concept: Refraction of Light - Refraction Through a Rectangular Glass Slab
Chapter: [3] Natural Phenomena
[1]33

Mohan obtained a sharp inverted image of a distant tree on the screen placed behind the lens. He then moved the screen and tried to look through the lens in the direction of the object. He would see: 

(1) a blurred image on the wall of the laboratory. 

(2) an erect image of the tree on the lens.

(3) no image as the screen has been removed 

(4) an inverted image of the tree at the focus of the lens.

Concept: Refraction at Spherical Surfaces and by Lenses - Power of a Lens
Chapter: [3] Natural Phenomena
[1]34

For finding the focal length of a convex lens by obtaining the image of a distant object, one should use as the object. 

(1) a well lit distant tree 

(2) window grill in the class room 

(3) any distant tree 

(4) a lighted candle kept at the other end of the table. 

Concept: Refraction of Light - Image Formation by Lenses - Convex Lens
Chapter: [3] Natural Phenomena
[1]35

To find the focal length of a concave mirror Rahul focuses a distant object with this mirror. The chosen object should be

(1) a tree

(2) a building

(3) a window

(4) the sun

Concept: Reflection of Light - Image Formation by Spherical Mirrors - Concave Mirror
Chapter: [3] Natural Phenomena
[1]36

The colour of an aqueous solution of zinc sulphate as observed in the laboratory is:

(1) Green 

(2) Yellow 

(3) Blue 

(4) Colourless

Concept: Chemical Reactions - Types of Chemical Reactions - Displacement
Chapter: [1.05] Chemical Reactions
[1]37

To show that zinc is a more active metal than copper, the correct procedure is to: 

(1) add dilute nitric acid on strips of both the metals. 

(2) observe transmission of heat through strips of zinc and copper. 

(3) prepare solution of zinc sulphate and hang strip of copper into it. 

(4) prepare solution of copper sulphate and hang strip of zinc into it. 

Concept: Chemical Reactions - Types of Chemical Reactions - Displacement
Chapter: [1.05] Chemical Reactions
[1]38

Acetic acid smells like: 

(1) a banana 

(2) vinegar 

(3) an orange

(4) a lemon 

Concept: Important Carbon Compounds - Ethanoic Acid (Acetic acid)
Chapter: [1.01] Carbon Compounds
[1]39

Acetic acid solution turns: 

(1) blue litmus red 

(2) red litmus blue 

(3) blue litmus colourless 

(4) red litmus colourless 

Concept: Important Carbon Compounds - Ethanoic Acid (Acetic acid)
Chapter: [1.01] Carbon Compounds
[1]40

On adding NaHCO3 to acetic acid, a gas is evolved which turns lime water milky due to the formation of:

(1) Calcium bicarbonate 

(2) Calcium hydroxide

(3) Calcium carbonate 

(4) Calcium acetate 

Concept: Important Carbon Compounds - Ethanoic Acid (Acetic acid)
Chapter: [1.01] Carbon Compounds
[1]41

A yeast cell in which budding occurs was seen to have: 

(1) one bud cell 

(2) two bud cell 

(3) three bud cell 

(4) a chain of bud cells 

Concept: Reproduction - Modes of Reproduction Used by Single Organisms - Budding
Chapter: [2.02] Reproduction

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