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 of atoms of different elements in the
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Class 10 Physics Lakhmir Singh And Manjit Kaur Solutions CHAPTER 6 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 are cornea and eye-lens. Question 3: Name the part of the eye
Class 10 Physics Lakhmir Singh and Manjit Kaur Solutions CHAPTER 5 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 from a denser medium to a
Class 10 Physics Lakhmir Singh and Manjit Kaur Solutions CHAPTER 4 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 of reflection, we know that
Class 10 Physics Lakhmir Singh and Manjit Kaur Solutions CHAPTER 3 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 calorific value. Question 3: “The calorific value of
Class 10 Physics Lakhmir Singh and Manjit Kaur Solutions CHAPTER 2 MAGNETIC EFFECTS OF ELECTRIC CURRENT
Lakhmir Singh Physics Class 10 Solutions Page No:73 Question 1: State any two properties of magnetic field lines. Solution : Prop of magnetic field lines: (i) The magnetic field lines originate from the north pole of a magnet and end at its south pole. (ii) The strength of magnetic field is indicated by the degree of closeness
Class 10 Physics Lakhmir Singh and Manjit Kaur Solutions CHAPTER 1 ELECTRICITY
Lakhmir Singh Physics Class 10 Solutions Page No:5 Question 1: By what other name is the unit joule/coulomb called ? Solution : Volt Question 2: Which of the following statements correctly defines a volt ? (a) a volt is a joule per ampere. (b) a volt is a joule per coulomb. Solution : (b) a volt is a joule per coulomb. Question
Class 9 Chemistry Lakhmir Singh and Manjit Kaur Solutions CHAPTER 4 STRUCTURE OF THE ATOM
Lakhmir Singh Class 9 CBSE Chemistry Text Book PAGE No 191 Answers Solution 01 Neutron is not present in ordinary hydrogen atom. Solution 02 J. J. Thomson Solution 03 Maximum of 2 e- can be accommodated in K shell of an atom. Solution 04 Maximum of 8 e- can be accommodated in L shell of an atom. Solution 05 Maximum
Class 9 Chemistry Lakhmir Singh and Manjit Kaur Solutions CHAPTER 3 ATOMS AND MOLECULES
Lakhmir Singh Class 9 CBSE Chemistry Text Book PAGE No 128 Solution 01 International Union of Pure and Applied Chemistry Solution 02 (a) Law of conservation of mass – Antonie Lavoisier (b) Law of constant proportions – Joseph Proust Solution 03 (a) Law of conservation of mass. (b) Law of constant proportions. Lakhmir Singh Class 9 CBSE Chemistry Text
Class 9 Chemistry Lakhmir Singh and Manjit Kaur Solutions CHAPTER 2 IS MATTER AROUND US PURE?
Lakhmir Singh Chemistry Text Book Page No – 56 Solution 01 False Solution 02 Milk, Paint, Glass Solution 03 Air is a mixture. Solution 04 Mercury is a liquid metal and bromine is a liquid non-metal. Solution 05 Sodium metal is soft and diamond is an extremely hard non-metal. Solution 06 Diamond is a non-metal which is good conductor of electricity. Solution 07 Mercury Solution