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Science All India Set 2 2014-2015 CBSE Class 10 Question Paper Solution

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Science [All India Set 2]
Marks: 90Academic Year: 2014-2015
Date: March 2015

[1]1

Write the number of covalent bonds in the molecule of propane, C3H8.

Concept: Carbon: a Versatile Element - Chains, Branches and Rings of Carbon Compound
Chapter: [0.011000000000000001] Carbon Compounds
[1]2

Where is DNA found in a cell ?

Concept: Reproduction in Plant
Chapter: [0.022000000000000002] Reproduction [0.022000000000000002] Reproduction
[1]3

The first trophic level in a food chain is always a green plant. Why ?

Concept: Food Chain
Chapter: [0.052000000000000005] Our Environment
[2]4

The absolute refractive indices of glass and water are 4/3 and 3/2, respectively. If the speed of light in glass is 2 × 108 m/s, calculate the speed of light in

(a) vacuum (b) water

Concept: Refractive Index
Chapter: [0.03] Natural Phenomena
[2]5

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: The Environment - Our Waste to the Environment
Chapter: [0.052000000000000005] Our Environment
[2]6

List any two advantages associated with water stored in the ground.

Concept: Natural Resources - Water for All - Water Harvesting
Chapter: [0.051] Management of Natural Resources
[3]7

What is meant by homologous series of carbon compounds?

Concept: Carbon: a Versatile Element - Homologous Series of Carbon Compound
Chapter: [0.011000000000000001] Carbon Compounds

Classify the following carbon compounds into two homologous series and name them.

C3H4, C3H6, C4H6, C4H8, C5H8, C5H10

Concept: Carbon: a Versatile Element - Homologous Series of Carbon Compound
Chapter: [0.011000000000000001] Carbon Compounds
[3]8

List two tests for experimentally distinguishing between an alcohol and a carboxylic acid and describe how these tests are performed.

Concept: Chemical Properties of Carbon Compound
Chapter: [0.011000000000000001] Carbon Compounds [0.011000000000000001] Carbon Compounds [0.011000000000000001] Carbon Compounds [0.011000000000000001] Carbon Compounds
[3]9

The elements 4Be, 12Mg and 20Ca, each having two valence electrons in their valence shells, are in periods 2, 3 and 4 respectively of the modern periodic table. Answer the following questions associated with these elements, giving reason in each case:

(a) In which group should they be?

(b) Which one of them is least reactive?

(c) Which one of them has the largest atomic size?

Concept: Periodic Properties
Chapter: [0.013000000000000001] Periodic Classification of Elements
[3]10

Taking the example of an element of atomic number 16, explain how the electronic configuration of the atom of an element relates to its position in the modern periodic table and how valency of an element is calculated on the basis of its atomic number.

Concept: Periodic Properties
Chapter: [0.013000000000000001] Periodic Classification of Elements
[3]11

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

Concept: Sexual Reproduction in Animals
Chapter: [0.022000000000000002] Reproduction
[3]12

List four points of significance of reproductive health in a society. Name any two areas related to the reproductive health which have improved over the past 50 years in our country.

Concept: Reproductive Health - Need and Methods of Family Planning
Chapter: [0.022000000000000002] Reproduction
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[3]13

What are chromosomes?

Concept: Sexual Reproduction in Animals
Chapter: [0.022000000000000002] Reproduction

Explain how in sexually reproducing organisms the number of chromosomes in the progeny is maintained.

Concept: Sexual Reproduction in Animals
Chapter: [0.022000000000000002] Reproduction
[3]14

A pea plant with blue colour flower denoted by BB is cross-bred with a pea plant with white flower denoted by ww.

(a) What is the expected colour of the flowers in their F1 progeny?

(b) What will be the percentage of plants bearing white flower in F2 generation, when the flowers of F1 plants were selfed?

(c) State the expected ratio of the genotype BB and Bw in the F2 progeny.

Concept: Rules for the Inheritance of Traits - Mendel’S Contributions
Chapter: [0.021] Heredity and Evolution
[3]15

Explain the following:- Speciation

Concept: Speciation
Chapter: [0.021] Heredity and Evolution

List four factors responsible for speciation.

Concept: Speciation
Chapter: [0.021] Heredity and Evolution

Explain the following:- Natural Selection

Concept: Concepts of Evolution
Chapter: [0.021] Heredity and Evolution
[3]16

What is meant by scattering of light? Use this phenomenon to explain why the clear sky appears blue or the Sun appears reddish at sunrise.

Concept: Some Natural Phenomena Due to Sunlight
Chapter: [0.03] Natural Phenomena
[3]17

If the image formed by a mirror for all positions of the object placed in front of it is always erect and diminished, what type of mirror is it? Draw a ray diagram to justify your answer. Where and why do we generally use this type of mirror?

Concept: Concave Mirror
Chapter: [0.03] Natural Phenomena [0.03] Natural Phenomena
[3]18

What is an ecosystem ?

Concept: Concept of Eco-System
Chapter: [0.052000000000000005] Our Environment

List two main components of ecosystem?

Concept: Food Chain
Chapter: [0.052000000000000005] 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: [0.052000000000000005] Our Environment
[5]19

What are fossils ?

Concept: Evolution and Classification - Fossils
Chapter: [0.021] Heredity and Evolution

How fossils formed ?

Concept: Evolution and Classification - Fossils
Chapter: [0.021] Heredity and Evolution

Describe in brief two methods of determining the age of fossils.

Concept: Evolution and Classification - Fossils
Chapter: [0.021] Heredity and Evolution

State any one role of fossils in the study of the process of evolution.

Concept: Evolution and Classification - Fossils
Chapter: [0.021] Heredity and Evolution
[5]20
[2]20.1

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: [0.022000000000000002] Reproduction
[3]20.2

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: [0.022000000000000002] Reproduction

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

Concept: Human Reproductive System
Chapter: [0.022000000000000002] Reproduction
[5]21

What is meant by a power of a lens? Define its SI unit. 

Concept: Refraction at Spherical Surfaces and by Lenses - Power of a Lens
Chapter: [0.03] Natural Phenomena

You have two lenses A and B of focal lengths +10 cm and –10 cm, respectively. State the nature and power of each lens. Which of the two lenses will form a virtual and magnified image of an object placed 8 cm from the lens? Draw a ray diagram to justify your answer

Concept: Refraction at Spherical Surfaces and by Lenses - Power of a Lens
Chapter: [0.03] Natural Phenomena
[5]22

Write the importance of ciliary muscles in the human eye. Name the defect of vision that arises due to gradual weakening of the ciliary muscles. What types of lenses are required by the person suffering from this defect to see the objects clearly?

Akshay, sitting in the last row in his class, could not see clearly the words write on the blackboard. When the teacher noticed it, he announced if any student sitting in the front row could volunteer to exchange his seat with Akshay. Salman immediately agreed to exchange his seat with Akshay. He could now see the words written on the blackboard clearly. The teacher thought it fit to send the message to Akshay’s parents advising them to get his eyesight checked.

In the context of the above event, answer the following questions:-

(a) Which defect of vision is Akshay suffering from? Which type of lens is used to correct this defect?

(b) State the values displayed by the teacher and Salman.

(c) In your opinion, in what way can Akshay express his gratitude towards the teacher and Salman?

Concept: Eye Defect and Its Correction: Myopia Or Near-sightedness
Chapter: [0.03] Natural Phenomena
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[5]23

One half of a convex lens of focal length 10 cm is covered with a black paper. Can such a lens produce an image of a complete object placed at a distance of 30 cm from the lens? Draw a ray diagram to justify your answer. A 4 cm tall object is placed perpendicular to its principal axis of a convex lens of focal length 20 cm. The distance of the object from the lens is 15 cm. Find the nature, position and the size of the image.

Concept: Spherical Mirrors
Chapter: [0.03] Natural Phenomena
[5]24

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

Concept: Soap
Chapter: [0.011000000000000001] Carbon Compounds

Describe in brief the cleansing action of soap.

Concept: Soap
Chapter: [0.011000000000000001] Carbon Compounds

Why do soaps not form lather in hard water?

Concept: Soap
Chapter: [0.011000000000000001] Carbon Compounds

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

Concept: Soap
Chapter: [0.011000000000000001] Carbon Compounds
[1]25

Given below is the list of vegetables available in the market. Select from these the two vegetables having homologous structures:

Potato, sweet potato, ginger, radish, tomato, carrot, okra (Lady’s finger)

(A) Potato and sweet potato

(B) Radish and carrot

(C) Okra and sweet potato

(D) Potato and tomato

Concept: Evolution and Classification - Tracing Evolutionary Relationships
Chapter: [0.021] Heredity and Evolution
[1]26

A student was asked to observe and identify the various parts of an embryo of a red kidney bean seed. He identified the parts and listed them as under:

I. Tegmen

II. Testa

III. Cotyledon

IV. Radicle

V. Plumule

The correctly identified parts among these are

(A) I, II and III

(B) II, III and IV

(C) III, IV and V

(D) I, III, IV and V

Concept: Sexual Reproduction in Flowering Plants
Chapter: [0.022000000000000002] Reproduction
[1]27

A student traces the path of a ray of light through a triangular glass prism for different values of angle of incidence. On analyzing the ray diagrams, which one of the following conclusions is he likely to draw?

(A) The emergent ray is parallel to the incident ray.

(B) The emergent ray bends at an angle to the direction of the incident ray.

(C) The emergent ray and the refracted ray are at right angles to each other.

(D) The emergent ray is perpendicular to the incident ray.

Concept: Dispersion by a Prism
Chapter: [0.03] Natural Phenomena
[1]28

A student traces the path of a ray of light through a rectangular glass slab for the different values of angle of incidence. He observes all possible precautions at each step of the experiment. At the end of the experiment, on analyzing the measurements, which of the following conclusions is he likely to draw?

(A) ∠i = ∠e < ∠r

(B) ∠i < ∠e < ∠r

(C) ∠i > ∠e > ∠r

(D) ∠i = ∠e > ∠r

Concept: Refraction of Light - Refraction Through a Rectangular Glass Slab
Chapter: [0.03] Natural Phenomena
[1]29

A student obtains a sharp image of the distant window (W) of the school laboratory on the screen (S) using the given concave mirror (M) to determine its focal length. Which of the following distances should he measure to get the focal length of the mirror?

(A) MW

(B) MS

(C) SW

(D) MW–MS

Concept: Spherical Mirrors
Chapter: [0.03] Natural Phenomena
[1]30

A student used a device (X) to obtain/focus the image of a well illuminated distant building on a screen (S) as shown below in the diagram. Select the correct statement about the device (X).

(A) This device is a concave lens of focal length 8 cm.

(B) This device is a convex mirror of focal length 8 cm.

(C) This device is a convex lens of focal length 4 cm.

(D) This device is a convex lens of focal length 8 cm.

Concept: Spherical Mirrors
Chapter: [0.03] Natural Phenomena
[1]31

A student takes about 4 ml of distilled water in four test tubes marked P, Q, R and S. He then dissolves in each test tube an equal amount of one salt in one test tube, namely sodium sulphate in P, potassium sulphate in Q, calcium sulphate in R and magnesium sulphate in S. After that he adds an equal amount of soap solution in each test tube. On shaking each of these test tubes well, he observes a good amount of lather (foam) in the test tube marked

(A) P and Q

(B) Q and R

(C) P, Q and S

(D) P, R and S

Concept: Soap
Chapter: [0.011000000000000001] Carbon Compounds
[1]32

What do we observe on pouring acetic acid on red and blue litmus papers?

(A) Red litmus remains red and blue litmus turns red.

(B) Red litmus turns blue and blue litmus remains blue.

(C) Red litmus turns blue and blue litmus turns red.

(D) Red litmus becomes colourless and blue litmus remains blue.

Concept: Chemical Properties of Acids and Bases
Chapter: [0.013999999999999999] Acids, Bases and Salts
[1]33

While preparing soap a small quantity of common salt is generally added to the reaction mixture of vegetable oil and sodium hydroxide. Which one of the following may be the purpose of adding common salt?

(A) To reduce the basic nature of the soap

(B) To make the soap neutral

(C) To enhance the cleansing power of the soap

(D) To favour the precipitation of the soap

Concept: Soap
Chapter: [0.011000000000000001] Carbon Compounds
[2]34

A 4 cm tall object is placed on the principal axis of a convex lens. The distance of the object from the optical centre of the lens is 12 cm and its sharp image is formed at a distance of 24 cm from it on a screen on the other side of the lens. If the object is now moved a little away from the lens, in which way (towards the lens or away from the lens) will he have to move the screen to get a sharp image of the object on it again? How will the magnification of the image be affected?

Concept: Spherical Mirrors
Chapter: [0.03] Natural Phenomena
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[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 (Uses of Salt) - Preparation and Uses of Baking Soda
Chapter: [0.013999999999999999] Acids, Bases and Salts
[2]36

Students were asked to observe the permanent slides showing different stages of budding in yeast under high power of a microscope.

(A) Which adjustment screw (coarse/fine) were you asked to move to focus the slides?

(B) Draw three diagrams in correct sequence showing budding in yeast.

Concept: Reproduction in Plant - Modes of Reproduction Used by Single Organisms - Budding
Chapter: [0.022000000000000002] Reproduction
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CBSE previous year question papers Class 10 Science with solutions 2014 - 2015

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