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Chapter 8: Force and Laws of Motion Intext Exercise 1: Question 1: Which of the following has more inertia: (a) a rubber ball and a stone of the same size? Answer: The inertia of an object is measured by its mass. Heavier or more massive objects offer larger inertia. Stone is heavier than the rubber ball […]

Chapter 7: Motion Question 1: An object has moved through a distance. Can it have zero displacement? If yes, support your answer with an example.Answer: Yes. An object can have zero displacement if it has moved through a distance. Displacement is defined as the shortest distance from the initial point to the final point.Hence, if

Chapter 6: Tissues Intext Questions: Question 1: What is a tissue?Answer: Tissue is a collection of cells with comparable structures that are placed in order to fulfil a given activity.Question 2: What is the utility of tissues in multicellular organisms?Answer: Tissues in multicellular organisms are differentiated to perform a specific function at a given location,

Chapter 5: The Fundamenta Unit of Life Question 1: Who discovered cells and how?Answer: Cells were discovered by Robert Hooke in 1665. He observed the honeycomb-like structure in a cork slice using a basic microscope.Question 2: Why is cell called the structural and functional unit of life?Answer: All living organisms are made up of a

Chapter 4: Structure of the Atom Intext Exercise 1  

Chapter 3: Atoms and Molecules Intext Exercise 1 Question: In a reaction, 5.3g of sodium carbonate reacted with 6g of ethanoic acid. The products were 2.2g of carbon dioxide, 0.9g water and 8.2g of sodium ethanoate. Show that these observations are in agreement with the law of conservation of mass.  Sodium Carbonate + ethanoic acid

Chapter 2: Is Matter Around Us Pure Excercise 1: Question 1: What is meant by a pure substance?Answer: The type of substance consisting of a single type of particle of the same chemical nature is called a pure substance. It can be classified as elements or compounds.Question 2: List the points of difference between homogeneous

Chapter 1: Matters In Our Surroundings Excercise 1: Question 1: Which of the following are the matter?Chair, air, love, smell, hate, almonds, thought, cold, cold drink, smell of perfume.Answer: Matter is anything that occupies space and has some mass. There are three states of matter called Solid, Liquid and Gas. On the basis of these

CHAPTER 12 Exercise 12.1: Question 1: A survey conducted by an organisation for the cause of illness and death among the women between the ages 15−44 (in years) worldwide, found the following figures (in %): S. No. Causes Female Fatality rate (%) 1 Repriductive health conditions 31.8 2 Neuropsychiatric conditions 24.4 3 Injuries 12.4 4

CHAPTER 11 Exercise 11.1: Question 1: Diameter of the base of a cone is (10.5space cm) and its slant height is (10space cm). Find its curved surface area. [Assume (pi=frac{22}{7})] Answer:  We are Given the Following: The slant height ((l)) of the cone (=10space cm) The diameter of the base of cone (=10.5space cm) So,