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Science All India Set 1 2008-2009 CBSE Class 10 Question Paper Solution

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Science [All India Set 1]
Marks: 60Date: 2008-2009 March

[1]1

In electrolysis of water, why is the volume of gas collected over one electrode double that of gas collected over the other electrode?

Concept: Balanced Chemical Equation
Chapter: [1.05] Chemical Reactions
[1]2

What effect does an increase in concentration of H+ (aq.) in a solution have on the pH of solution?

Concept: Chemical Reactions - Types of Chemical Reactions - Combination
Chapter: [1.05] Chemical Reactions
[1]3

Complete the following chemical equations : C2H5OH + Na →

Concept: Important Carbon Compounds - Ethanoic Acid (Acetic acid)
Chapter: [1.01] Carbon Compounds
[1]4

Draw a schematic diagram of an electric circuit consisting of a battery of two cells each of 1.5 V, 5 Ω, 10 Ω and 15 Ω resistors and a plug key, all connected in series.

Concept: Electric Current and Circuit
Chapter: [4.02] Effects of Current
[1]5

When is the force experienced by a current-carrying conductor placed in a magnetic field largest?

Concept: Magnetic Field Due to a Current carrying Straight Conductor
Chapter: [4.01] Magnetic Effects of Current
[1]6

Name the rule for finding the direction of magnetic field produced by a straight current-carrying conductor.

Concept: Magnetic Field Due to a Current carrying Straight Conductor
Chapter: [4.01] Magnetic Effects of Current
[2]7

(i) Name the products formed when sodium hydrogen carbonate is heated.

(ii) Write the chemical equation for the reaction involved in the above.

Concept: Chemicals from Common Salt - Baking Soda
Chapter: [1.04] Acids, Bases and Salts
[2]8

(i) What is observed when a solution of potassium iodide is added to a solution of lead nitrate taken in a test tube?
(ii) What type of reaction is this?
(iii) Write a balanced chemical equation to represent the above reaction.

Concept: Chemical Reactions - Types of Chemical Reactions - Double Displacement
Chapter: [1.05] Chemical Reactions
[2]9

What does an electric circuit mean?

Concept: Electric Current and Circuit
Chapter: [4.02] Effects of Current

Distinguish between an open and a closed circuit.

Concept: Electric Current and Circuit
Chapter: [4.02] Effects of Current
[2]10

Calculate the resistance of an electric bulb which allows a 10 A current when connected to a 220 V power source.

Concept: Electric Power
Chapter: [4.02] Effects of Current
[3]11

What is periodicity in properties of elements with reference to the Modern Periodic Table? 

Concept: The Modern Periodic Table
Chapter: [1.03] Periodic Classification of Elements

Why do all the elements of the same group have similar properties?

Concept: The Modern Periodic Table
Chapter: [1.03] Periodic Classification of Elements

How will the tendency to gain electrons change as we go from left to right across a period? Why?

 

Concept: The Modern Periodic Table
Chapter: [1.03] Periodic Classification of Elements
[3]12

Distinguish between esterification and saponification reactions of organic compounds.

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

With a labelled diagram describe an activity to show the formation of an ester.

Concept: Important Carbon Compounds - Ethanol
Chapter: [1.01] Carbon Compounds
[3]13

For which position of the object does a convex lens form a virtual and erect image? Explain with the help of a ray diagram.

Concept: Refraction of Light - Image Formation in Lenses Using Ray Diagrams - Convex Lens
Chapter: [3] Natural Phenomena
[3]14

 Define the term ‘volt’.

Concept: Electric Potential Difference
Chapter: [4.02] Effects of Current

State the relation between work, charge and potential difference for an electric circuit.

Concept: Electric Current and Circuit
Chapter: [4.02] Effects of Current

Calculate the potential difference between the two terminals of a battery if 100 joules of work is required to transfer 20 coulombs of charge from one terminal of the battery to the other.

Concept: Electric Potential Difference
Chapter: [4.02] Effects of Current
[5]15 | Attempt one of the following
[5]15.1

Distinguish between ionic and covalent compounds under the following properties:

(i) Strength of forces between constituent elements

(ii) Solubility of compounds in water

(iii) Electrical conduction in substances

Concept: Metals and Nonmetals - Formation and Properties of Covalent Compounds
Chapter: [1.02] Metals and Non Metals

Explain how the following metals are obtained from their compounds by the reduction process:

(i) Metal M which is in the middle of the reactivity series.

(ii) Metal N which is high up in the reactivity series.

Give one example of each type

Concept: Occurrence of Metals - Refining of Metals
Chapter: [1.02] Metals and Non Metals
[5]15.2

Distinguish between ‘roasting’ and ‘calcination’. Which of these two is used for sulphide ores and why?

Concept: Occurrence of Metals - Extraction of Metals
Chapter: [1.02] Metals and Non Metals

Write a chemical equation to illustrate the use of aluminium for joining cracked railway lines.

Concept: Metals and Nonmetals - Chemical Properties of Metals - Metals React with Solutions of Other Metal Salts
Chapter: [1.02] Metals and Non Metals

Name the anode, the cathode and the electrolyte used in the electrolytic refining of impure copper.

Concept: Occurrence of Metals - Extraction of Metals
Chapter: [1.02] Metals and Non Metals
[5]16

What is a dispersion of white light?

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

State the cause of dispersion of white light

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

Draw a ray diagram to show the dispersion of white light by a glass prism.

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

A glass prism is able to produce the spectrum when white light passes through it, but a glass slab doesn’t produce any spectrum. Explain why it is so. 

Concept: Dispersion by a Prism
Chapter: [3] Natural Phenomena
[1]17

Which compounds are responsible for the depletion of ozone layer?

Concept: Ozone Layer
Chapter: [5.02] Our Environment
[1]18

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

Concept: Reproduction - Introduction
Chapter: [2.02] Reproduction
[1]19

Where does digestion of fat take place in our body?

Concept: Nutrition - Nutrition in Human Beings
Chapter: [2.04] Life Processes
[2]20

How is charcoal obtained from wood? 

 

 
Concept: Improvements in the Technology for Using Conventional Sources of Energy
Chapter: [5.03] Sources of Energy

Why is charcoal considered a better fuel than wood?

Concept: Improvements in the Technology for Using Conventional Sources of Energy
Chapter: [5.03] Sources of Energy
[2]21

Describe how hydro-energy can be converted into electrical energy.

Concept: Conventional Sources of Energy - Hydro Power Plants
Chapter: [5.03] Sources of Energy

Write any two limitations of hydro-energy.

Concept: Conventional Sources of Energy - Hydro Power Plants
Chapter: [5.03] Sources of Energy
[2]22

What is Chipko movement?

Concept: Natural Resources - Forests and Wild Life - Sustainable Management
Chapter: [5.01] Management of Natural Resources

Why should we conserve forests?

Concept: Natural Resources - Forests and Wild Life - Sustainable Management
Chapter: [5.01] Management of Natural Resources
[2]23

Suggest any four changes that you would like to be incorporated in the life-style of students of your age to move towards a sustainable use of available resources.

Concept: Sustainability of Natural Resources
Chapter: [5.01] Management of Natural Resources
[2]24

Describe the role of the following in human beings:

(i) Seminal vesicles

(ii) Prostate gland

Concept: Reproduction in Human Beings
Chapter: [2.02] Reproduction
[3]25

What is phototropism?

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

How does phototropism occur in plants?

Concept: Coordination in Plants - Movement Due to Growth
Chapter: [2.03] Control and Co-ordination in Animals and Plants

Describe an activity to demonstrate phototropism.

Concept: Sexual Reproduction in Flowering Plants
Chapter: [2.02] Reproduction
[3]26

Explain how the sex of the child is determined at the time of conception in human beings.

Concept: Reproduction in Human Beings
Chapter: [2.02] Reproduction
[5]27

Draw a sectional view of the human heart and label on it Aorta, Pulmonary arteries, Vena cava, Left ventricle.

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

Describe double circulation in human beings. Why is it necessary?

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

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