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Science Delhi Set 1 2013-2014 CBSE Class 10 Question Paper Solution

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Science
Delhi Set 1
2013-2014 March
Marks: 90

[1]1

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

Concept: Position of Elements and Trends in the Modern Periodic Table
Chapter: [1.03] Periodic Classification of Elements
[1]2

Give the respective scientific terms used for studying the mechanism by which variations are created and inherited

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

Give the respective scientific terms used for studying the development of new type of organisms from the existing ones.

Concept: Basic Concepts of Evolution
Chapter: [2.01] Heredity and Evolution
[1]3

Water is a valuable resource. List two ways, that you would suggest every family member to save this resource.

Concept: Natural Resources - Water for All - Water Harvesting
Chapter: [5.01] Management of Natural Resources
[2]4

List two advantages of vegetative propagation.

Concept: Reproduction - Modes of Reproduction Used by Multicellular Organisms - Vegetative Propagation
Chapter: [2.02] Reproduction
[2]5

Draw a ray diagram to show the path of the reflected ray corresponding to an incident ray of light parallel to the principal axis of a convex mirror and show the angle of incidence and angle of reflection on it.

Concept: Representation of Images Formed by Spherical Mirrors Using Ray Diagrams - Concave Mirror
Chapter: [3] Natural Phenomena
[2]6

Why is Government of India imposing a ban on the use of polythene bags? Suggest two alternatives to these bags and explain how this ban is likely to improve the environment.

Concept: Biodegradable and Non-biodegradable Substances
Chapter: [5.02] Our Environment
[2]7

What is meant by biodiversity? List two advantages of conserving forests and wild life.

Concept: Natural Resources - Forests and Wild Life - Stakeholders
Chapter: [5.01] Management of Natural Resources
[3]8

State the meaning of functional group in a carbon compound.

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

Write the functional group present in (i) ethanol and (ii) ethanoic acid and also draw their structures.

Concept: Versatile Nature of Carbon - Nomenclature of Carbon Compounds
Chapter: [1.01] Carbon Compounds
[3]9

Write the name and general formula of a chain of hydrocarbons in which an addition reaction with hydrogen is possible. State the essential condition for an addition reaction. Stating this condition, write a chemical equation giving the name of the reactant and the product of the reaction.

Concept: Versatile Nature of Carbon - Chains, Branches and Rings
Chapter: [1.01] Carbon Compounds
[3]10

Based on the group valency of elements state the formula lot the following giving justification for each :-

(i) Oxides of 1st group elements,

(ii) Halides of the elements of group 13, and

(iii) Compounds formed when an element of group 2 combines with, an element of group 16.

Concept: Position of Elements and Trends in the Modern Periodic Table
Chapter: [1.03] Periodic Classification of Elements
[3]11
[1]11.1

Define the term : Valency

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

Define the term : Atomic size

Concept: Position of Elements and Trends in the Modern Periodic Table
Chapter: [1.03] Periodic Classification of Elements
[2]11.2

How do the valency and the atomic size of the elements vary while going from left to right along a period in the modern periodic table?

Concept: Position of Elements and Trends in the Modern Periodic Table
Chapter: [1.03] Periodic Classification of Elements
[3]12

Explain the process of regeneration in Planaria.

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

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]14
[2]14.1

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

Concept: Evolution by Stages
Chapter: [2.01] Heredity and Evolution
[1]14.2

Insects, octopus, planaria and vertebrates possess eyes. Can we group these animals together on the basis of eyes that they possess ? Justify your answer giving reason.

Concept: Evolution and Classification - Introduction
Chapter: [2.01] Heredity and Evolution
[3]15

A cross was made between pure breeding pea plants one with round and green seeds and the other with wrinkled and yellow seeds.

(a) Write the phenotype of F1 progeny. Give reason for your answer.

(b) Write the different types of F2 progeny obtained along with their ration when F1 progeny was selfed.

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

A spherical mirror produces an image of magnification -1 on a screen placed at a distance of 50 cm from the mirror.

(a) Write the type of mirror.

(b) Find the distance of the image from the object.

(c) What is the focal length of the mirror?

(d) Draw the ray diagram to show the image formation in this case.

Concept: Lens Formula and Magnification
Chapter: [3] Natural Phenomena
[3]17

State the laws of refraction of light.

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

If the speed of light in vacuum is 3 × 108 ms−1, find the speed of light in a medium of absolute refractive index 1.5.

Concept: Refraction of Light - Refraction Through a Rectangular Glass Slab
Chapter: [3] Natural Phenomena
[3]18

Explain giving reason why the sky appears blue to an observer from the surface of the earth? What will the colour of the sky be for an astronaut staying in the international space station orbiting the earth? Justify your answer giving reason.

Concept: Some Natural Phenomena Due to Sunlight
Chapter: [3] Natural Phenomena
[3]19

"Our food grains such as wheat and rice, the vegetables and fruits and even meat are found to contain varying amounts of pesticide residues." State the reason to explain how and why it happens?

Concept: Components of Eco System - Food Chains and Webs
Chapter: [5.02] Our Environment
[5]20

State the reason why carbon can neither form C4+ cations nor C4 anions but forms covalent compound.

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

state the reason to explain why covalent compounds "are bad conductors of electricity".

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

State the reason to explain why covalent compounds "have low melting and boiling points."

Concept: Bonding in Carbon - Covalent Bond
Chapter: [1.01] Carbon Compounds
[5]21
[1]21.1

Give one example each of a unisexual and a bisexual flower.

Concept: Sexual Reproduction in Flowering Plants
Chapter: [2.02] Reproduction
[2]21.2

Mention the changes a flower undergoes after fertilisation.

Concept: Sexual Reproduction in Flowering Plants
Chapter: [2.02] Reproduction
[2]21.3

How does the amount of DNA remain constant though each new generation is a combination of DNA copies of two individuals?

Concept: Reproduction - Introduction
Chapter: [2.02] Reproduction
[5]22
[3]22.1

Name the respective part of human female reproductive system:-

(i) that produces eggs,

(ii) where fusion of eggs and sperm takes place, and

(iii) where zygote gets implanted.

Concept: Reproduction in Human Beings
Chapter: [2.02] Reproduction
[2]22.2

Describe in brief what happens to the zygote after it gets implanted.

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

A student wants to project the image of a candle flame on the walls of school laboratory by using a lens:-

(a) Which type of lens should be use and why?

(b) At what distance in terms of focal length 'F' of the lens should be place the candle flame so as to get (i) a magnified, and (ii) a diminished image respectively on the wall?

(c) Draw ray diagram to show the formation of the image in each case?

Concept: Refraction of Light - Image Formation by Lenses - Convex Lens
Chapter: [3] Natural Phenomena
[5]24
[3]24.1

List three common refractive defects of vision. Suggest the way of correcting these defects.

Concept: Defects of Vision and Their Correction
Chapter: [3] Natural Phenomena
[2]24.2

About 45 lac people in the developing countries are suffering from corneal blindness. About 30 lac children below the age of 12 years suffering from this defect can be cured by replacing the defective cornea with the cornea of a donated eye. How and why can students of your age involve themselves to create awareness about this fact among people?

Concept: Defects of Vision and Their Correction
Chapter: [3] Natural Phenomena
[1]25

When you add about 2 ml of acetic acid to a test tube containing an equal amount of distilled water and leave the test tube to settle after shaking its contents, what will you observe in the test tube after about 5 minutes?

(A) A white precipitate settling at its bottom

(B) A clear colourless solution

(C) A layer of water over the layer of acetic acid

(D) A layer of acetic acid over the layer of water

Concept: Important Carbon Compounds - Ethanoic Acid (Acetic acid)
Chapter: [1.01] Carbon Compounds
[1]26

A student adds a few drops of ethanoic acid to test tubes X, Y and Z containing aqueous solutions of sodium chloride, sodium hydroxide and sodium carbonate, respectively. If he now brings a burning splinter near the mouth of the test tubes immediately after adding ethanoic acid in each one of them, in which of the test tube or test tubes the flame will be extinguished?

(A) X and Y

(B) Y and Z

(C) X and Z

(D) only Z

Concept: Important Carbon Compounds - Ethanoic Acid (Acetic acid)
Chapter: [1.01] Carbon Compounds
[1]27

In order to study saponification reaction, we first prepare 20% solution of sodium hydroxide. If we record the temperature of this solution just after adding sodium hydroxide flakes to water and also test its nature using litmus, it may be concluded that the process of making this solution is

(A) exothermic and the solution is alkaline

(B) endothermic and the solution is alkaline

(C) endothermic and the solution is acidic

(D) exothermic and the solution is acidic

Concept: Important Carbon Compounds - Ethanoic Acid (Acetic acid)
Chapter: [1.01] Carbon Compounds
[1]28

While studying saponification reaction for the preparation of soap, a teacher suggested to a student to add a small quantity of common salt to the reaction mixture. The function of common salt in this reaction is to

(A) reduce the alkalinity of the soap

(B) reduce the acidity of the soap

(C) enhance the cleansing capacity of soap

(D) favour precipitation of soap

Concept: Important Carbon Compounds - Ethanoic Acid (Acetic acid)
Chapter: [1.01] Carbon Compounds
[1]29

A student takes about 6 ml of distilled water in each of the four test tubes P, Q, R and S. He then dissolves an equal amount of four different salts namely, sodium chloride in 'P', potassium chloride in 'Q', calcium chloride in 'R' and magnesium chloride in 'S'. Next, he then adds 10 drops of soap solution to each test tube and shakes its contents. The test tubes in which scum (insoluble substance) is formed with soap are:

(A) P and Q

(B) Q and R

(C) R and S

(D) Q and S

Concept: Important Carbon Compounds - Ethanoic Acid (Acetic acid)
Chapter: [1.01] Carbon Compounds
[1]30

A student has obtained the image of a distant object with a concave mirror to determine its focal length. If he has selected a well-illuminated red building as object, which of the following correctly describes the features of the image formed?

(A) Virtual, inverted and diminished image in red shade

(B) Real, erect and diminished image in pink shade

(C) Real, inverted and diminished image in red shade

(D) Virtual, erect and enlarged image in red shade

Concept: Reflection of Light - Image Formation by Spherical Mirrors - Concave Mirror
Chapter: [3] Natural Phenomena
[1]31

A student has obtained an image of a distant object on a screen to determine the focal length F1 of the given lens. His teacher, after checking the image, gave him another lens of  focal length F2 and asked him to focus the same object on the same screen. The student found that to obtain a sharp image, he has to move the lens away from the screen. From this finding, we may conclude that both the lenses given to the student were :

(A) Concave and F1 < F2

(B) Convex and F1 < F2

(C) Convex and F1 > F2

(D) Concave and F1 > F2

Concept: Lens Formula and Magnification
Chapter: [3] Natural Phenomena
[1]32

Study the following four experimental set-ups I, II, III and IV for the experiment, "To trace the path of a ray of light through a rectangular glass slab."

Which of the marked set-ups is likely to give best results (P1 and P2 are the positions of pins fixed on the incident ray)?

(A) I

(B) II

(C) III

(D) IV

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

On the basis of the experiment, "To trace the path of a ray of light through a rectangular glass slab", students of a class arrived at which one of the following conclusions?

(A) Angle of incidence is greater than the angle of emergence.

(B) Angle of emergence is smaller than the angle of refraction.

(C) Emergent ray is parallel to the refracted ray.

(D) Incident ray and emergent ray are parallel to each other.

Concept: Refraction of Light - Refraction Through a Rectangular Glass Slab
Chapter: [3] Natural Phenomena
[1]34

The path of a ray of light passing through a glass prism is shown below:

In this diagram, the angle of prism, angle of incidence, angle of emergence and angle of deviation, respectively, have been represented by:

(A) O, Y, Z and N,

(B) P, Y, M and Z,

(C) O, X, M and Z,

(D) P, X, Z and N.

Concept: Dispersion by a Prism
Chapter: [3] Natural Phenomena
[1]35

A student is observing a diagram showing the path of a ray of light passing through a glass prism. He would find that for all angles of incidence the ray of light bends:

(A) towards the normal while entering the prism and away from the normal while emerging from the prism

(B) away from the normal while entering the prism and towards the normal while emerging from the prism

(C) away from the normal while entering as well as while emerging from the prism

(D) towards the normal while entering as well as while emerging from the prism

Concept: Dispersion by a Prism
Chapter: [3] Natural Phenomena
[1]36

A student was asked by his teacher to find the image distance for various object distance in case of a given convex lens. He performed the experiment with all precautions and noted down his observations in the following table:

S. No.

Object distance

(cm)

Image distance

(cm)

1 60 15
2 48 16
3 36 21
4 24 24
5 18 36
6 16 48

After checking the observations table the teacher pointed out that there is a mistake in recording the image distance in one of the observations. Find the serial number of the observations having faulty image distance.

(A) 2

(B) 3

(C) 5

(D) 6

Concept: Lens Formula and Magnification
Chapter: [3] Natural Phenomena
[1]37

A student has obtained a magnified image of a flame on a screen using a convex lens. To draw the corresponding ray diagram to show the image formation, which of the following two rays whose paths after refraction are shown, should he select ?

(A) I and II

(B) II and III

(C) III and IV

(D) I and III

Concept: Refraction of Light - Image Formation in Lenses Using Ray Diagrams - Convex Lens
Chapter: [3] Natural Phenomena
[1]38

Study the following diagrams showing various stages of binary fission in Amoeba:

The correct sequence of these diagrams should be:

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

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

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

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

Concept: Reproduction - Modes of Reproduction Used by Single Organisms - Fission
Chapter: [2.02] Reproduction
[1]39

Identify the figures showing the process of budding in yeast.

(A) I, II and III

(B) II, III and IV

(C) I, II and IV

(D) III, IV and I

Concept: Reproduction - Modes of Reproduction Used by Single Organisms - Budding
Chapter: [2.02] Reproduction
[1]40

Which one of the following pairs of vegetables is an example of homologous structures?

(A) Potato and sweet potato

(B) Carrot and radish

(C) Carrot and tomato

(D) Tomato and radish

Concept: Evolution and Classification - Tracing Evolutionary Relationships
Chapter: [2.01] Heredity and Evolution
[1]41

Four students P, Q, R and S differently reported the following set of organs to be analogous :

P. Forelimb of a frog and forelimb of a lizard

Q. Forelimb of a bird and forelimb of a human

R. Wings of a parrot and wings of a butterfly

S. Wings of a bird and wings of a bat

The two students who have reported correctly are :

(A) P and Q

(B) Q and R

(C) R and S

(D) P and S

Concept: Evolution and Classification - Tracing Evolutionary Relationships
Chapter: [2.01] Heredity and Evolution
[1]42

You are asked by your teacher to study the different parts of an embryo of a gram seed. Given below are the steps to be followed for the experiment:

I. Soak the gram seeds in plain water and keep them overnight.

II. Cut open a soaked seed and observe its different parts.

III. Take some dry gram seeds in a petri dish.

IV. Drain the excess water.

V. Cover the soaked seeds with a wet cotton cloth and leave them for a day.

The correct sequence of these steps is :

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

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

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

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

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

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