English Medium
Academic Year: 2008-2009
Date: March 2009
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In electrolysis of water, why is the volume of gas collected over one electrode double that of gas collected over the other electrode?
Chapter: [0.01] Chemical Reactions and Equations
What effect does an increase in concentration of H+ (aq.) in a solution have on the pH of solution?
Chapter: [0.01] Chemical Reactions and Equations
Complete the following chemical equations : C2H5OH + Na →
Chapter: [0.04] Carbon and its Compounds
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.
Chapter: [0.11] Electricity
When is the force experienced by a current-carrying conductor placed in a magnetic field largest?
Chapter: [0.12] Magnetic Effects of Electric Current
Name the rule for finding the direction of magnetic field produced by a straight current-carrying conductor.
Chapter: [0.12] Magnetic Effects of Electric Current
(i) Name the products formed when sodium hydrogen carbonate is heated.
(ii) Write the chemical equation for the reaction involved in the above.
Chapter: [0.02] Acids, Bases and Salts
(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.
Chapter: [0.01] Chemical Reactions and Equations
What does an electric circuit mean?
Chapter: [0.11] Electricity
Distinguish between an open and a closed circuit.
Chapter: [0.11] Electricity
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Calculate the resistance of an electric bulb which allows a 10 A current when connected to a 220 V power source.
Chapter: [0.11] Electricity
What is periodicity in properties of elements with reference to the Modern Periodic Table?
Chapter: [0.05] Periodic Classification of Elements
Why do all the elements of the same group have similar properties?
Chapter: [0.05] Periodic Classification of Elements
How will the tendency to gain electrons change as we go from left to right across a period? Why?
Chapter: [0.05] Periodic Classification of Elements
Distinguish between esterification and saponification reactions of organic compounds.
Chapter: [0.04] Carbon and its Compounds
With a labelled diagram describe an activity to show the formation of an ester.
Chapter: [0.04] Carbon and its Compounds
For which position of the object does a convex lens form a virtual and erect image? Explain with the help of a ray diagram.
Chapter: [0.09] Light - Reflection and Refraction
State the relation between work, charge and potential difference for an electric circuit.
Chapter: [0.11] Electricity
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.
Chapter: [0.11] Electricity
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
Chapter: [0.03] Metals and Non Metals [0.04] Carbon and its Compounds
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
Chapter: [0.03] Metals and Non Metals
Distinguish between ‘roasting’ and ‘calcination’. Which of these two is used for sulphide ores and why?
Chapter: [0.03] Metals and Non Metals
Write a chemical equation to illustrate the use of aluminium for joining cracked railway lines.
Chapter: [0.03] Metals and Non Metals
Name the anode, the cathode and the electrolyte used in the electrolytic refining of impure copper.
Chapter: [0.03] Metals and Non Metals
Define the term dispersion of white light.
Chapter: [0.1] The Human Eye and the Colourful World
State the cause of dispersion of white light
Chapter: [0.1] The Human Eye and the Colourful World
Draw a ray diagram to show the dispersion of white light.
Chapter: [0.1] The Human Eye and the Colourful World
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.
Chapter: [0.1] The Human Eye and the Colourful World
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Which compounds are responsible for the depletion of ozone layer?
Chapter: [0.13] Our Environment
Why is DNA copying an essential part of the process of reproduction?
Chapter: [0.07] How do Organisms Reproduce?
Where does digestion of fat take place in our body?
Chapter: [0.05] Life Processes
How is charcoal obtained from wood?
Chapter: [0.14] Sources of Energy
Why is charcoal considered a better fuel than wood?
Chapter: [0.14] Sources of Energy
Describe how hydro-energy can be converted into electrical energy.
Chapter: [0.14] Sources of Energy
Write any two limitations of hydro-energy.
Chapter: [0.14] Sources of Energy
What is Chipko movement?
Chapter: [0.16] Sustainable Management of Natural Resources
Why should we conserve forests?
Chapter: [0.16] Sustainable Management of Natural Resources
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.
Chapter: [0.16] Sustainable Management of Natural Resources
Describe the role of the following in human beings:
(i) Seminal vesicles
(ii) Prostate gland
Chapter: [0.07] How do Organisms Reproduce?
What is phototropism?
Chapter: [0.07] How do Organisms Reproduce?
How does phototropism occur in plants?
Chapter: [0.06] Control and Co-ordination
Describe an activity to demonstrate phototropism.
Chapter: [0.07] How do Organisms Reproduce?
Explain how the sex of the child is determined at the time of conception in human beings.
Chapter: [0.07] How do Organisms Reproduce?
Draw a sectional view of the human heart and label on it Aorta, Pulmonary arteries, Vena cava, Left ventricle.
Chapter: [0.05] Life Processes
Describe double circulation in human beings.
Chapter: [0.05] Life Processes
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