Lakhmir Singh Biology Class 10 Solutions Life Processes Lakhmir Singh Biology Class 10 Solutions Page No:23 Question 1:Which is the basic requirement of living organisms for obtaining energy ?Solution :Food is the basic requirement of living organisms for obtaining energy. Question 2:Which of the following type of energy is used by living organisms to perform vital life …
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Lakhmir Singh Chemistry Class 10 Solutions Periodic Classification Of Elements Lakhmir Singh Chemistry Class 10 Solutions Page No:281 Question 1:(a) On what basis did Mendeleev arrange the elements in his periodic table ?(B) On what basis are they arranged now ?Solution :(a) Mendeleev arrange the element in his periodic table on the basis of atomic masses.(b) …
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Lakhmir Singh Chemistry Class 10 Solutions Carbon and Its Compounds Lakhmir Singh Chemistry Class 10 Solutions Page No:220 Question 1:Name the element whose one of the allotropic forms is buckminsterfullerene.Solution :Carbon Question 2:What are the two properties of carbon which lead to the formation of a large number of carbon compounds ?Solution :Catenation(Self linking of carbon …
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Lakhmir Singh Chemistry Class 10 Solutions Metals And Non-metals Lakhmir Singh Chemistry Class 10 Solutions Page No:131 Question 1:Name one metal and one non-metal which exist in liquid state at room temperature.Solution :Metal – Mercury.Non metal – Bromine. Question 2:Why are metals called electropositive elements whereas non-metals are called electronegative elements ?Solution :Metals are electropositive …
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Lakhmir Singh Chemistry Class 10 Solutions Acids,Bases And Salts Lakhmir Singh Chemistry Class 10 Solutions Page No:66 Question 1:What colour do the following indicators turn when added to a base or alkali (such as sodium hydroxide) ?(a) methyl orange(b) litmus(c) red cabbage extractSolution :(a) Yellow.(b) Blue.(c) Green. Question 2:What colours do the following indicators turn when …
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Lakhmir Singh Chemistry Class 10 Solutions Chemical Reactions And Equations Lakhmir Singh Chemistry Class 10 Solutions Page No:18 Question 1:Why is respiration considered an exothermic process ?Solution :Respiration is an exothermic process because energy is produced during this process. Question 2:On what basis is a chemical equation balanced ?Solution :A balanced chemical equation has equal number …
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Lakhmir Singh Physics Class 10 Solutions The Human Eyes And The Colorful World Lakhmir Singh Physics Class 10 Solutions Page No:269 Question 1:What kind of lens is present in the human eye ?Solution :Convex lens Question 2:Name two parts of the eye which refract light rays (or bend light rays)Solution :Two parts which refract light rays …
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Lakhmir Singh Physics Class 10 Solutions Refraction Of Light Lakhmir Singh Physics Class 10 Solutions Page No:219 Question 1:If a ray of light goes from a rarer medium to a denser medium, will it bend towards the normal or away from it ?Solution :It will bend towards the normal. Question 2:If a ray of light goes …
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Lakhmir Singh Physics Class 10 Solutions Reflection of Light Lakhmir Singh Physics Class 10 Solutions Page No:173 Question 1:What happens when a ray of light falls normally (or perpendicularly) on the surface of a plane mirror ?Solution :As ray of light falls normally on mirror, this means that angle of incidence is 0o. From second law …
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Lakhmir Singh Physics Class 10 Solutions Sources Of Energy Lakhmir Singh Physics Class 10 Solutions Page No:121 Question 1:Name a non-renewable source of energy other than fossil fuels.Solution :Nuclear fuels (like uranium) Question 2:Define calorific value of a fuel.Solution :The amount of heat produced by burning 1 gram of a fuel completely is known as its …
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