A stone is of 1 kg is thrown with a velocity of 20 m\s across the frozen surface of a lake and comes to rest after travelling a distance of 50 m . What is the force of friction between the stone and the ice .
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September 2023
A batsman hits a cricket ball which then rolls on the roof on a level ground . After covering a short distance the ball comes to rest . The ball slows to stop because [a] The batsman did not hit the ball hard enough . [b] Velocity is propotional to...
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September 2023
A truck starts from rest and rolls down a hill with a constant acceleration . It travels a distance of 400m in 20 sec . Find its acceleration . Find the force acting on it if its mass is 7 tonnes .
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September 2023
Which condition out of the following will increase the evaporation of water? a) Increase in temperature of water b) decrease in temperature of water c) less exposed surface area of water d) adding common salt to water
Evaporation is a surface phenomenon . Explain .
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September 2023
Give reasons for the following:- a) Our palm feels cold when we put some acetone or petrol or perfume on it. b) We able to sip hot tea or milk faster from a saucer rather than a cup. c) We wear cotton clothes in summer. d) We see water droplets...
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December 2022
What happens when a red blood cell is kept in hypotonic and in hypertonic solution
Differentiate between Homogeneous and Heterogeneous mixtueres
What is an impure substance . Give examples
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December 2022
Classify the following as Chemical or Physical changes Cutting of trees, melting of a butter in a pan, rusting of almirah, boiling of water to form steam, passing of electric current through water and the water breaking down into hydrogen and oxygen gases, dissolving common salt in water, making a...
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December 2022
Burning of a candle is both physical as well as a chemical change . Explain .
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December 2022
Tincture of iodine has antiseptic properties . This solution is made by Dissolving i] Iodine in potassium iodine ii] Iodine in vaseline iii] Iodine in water iv] Iodine in alchol
Why is air called a mixture and water as compounds . Explain .
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December 2022
Which of the following materials fall in the category of a pure substance and impure substances. Also, classify as elements, Compound and Mixture. Ice, milk, iron, hydrochloride acid, calcium oxide, mercury, brick, wood, air, sodium, soil, sugar solution, silver, calcium carbonate, tin, silicon, carbon dioxide, soap, methane, blood and coal...
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December 2022
Classify each of the following as a homogeneous mixture Soda water , Ice , Wood , Air , Soil , Vineager and Filtered tea
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December 2022
What do we mean by Tyndall Effect . Why does an aqueous solution of copper sulphate does not show Tyndall Effect .
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December 2022
i] How does the solubility of solid in a liquid vary with temperature and pressure.ii] How does the solubility of gases in liquid vary with temperature and pressure.
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December 2022
Tincture of iodine has antiseptic properties . This solution is made by Dissolving i] ii] Iodine in vaseline
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December 2022
What happens when a red blood cell is kept in hypo-tonic and hyper tonic solution
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December 2022
To make a saturated solution, 36 g of sodium chloride is dissolved in 100 g of water at 293 K. Find its concentration in terms of mass by mass percentage of solution .
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December 2022
5g of sugar is dissolved in 250 ml of solution. Calculate the concentration in terms of mass by volume percentage of the solution.
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December 2022
What is meant by the concentration of solution What are various ways in which the concentration of solution can be expressed