Chapter 9 Force and Laws of Motion
Chapter 9 Force and Laws of Motion TEXT BOOK QUESTIONS Question 1. Which of the following has more inertia ? (a) a rubber ball and a stone of the same size ? (b) a bicycle and a train ? (c) a five rupee coin and a one- rupee coin ? (CBSE 2011, 2013) Answer: (a) […]
Chapter 8 Motion
Chapter 8 Motion TEXT BOOK QUESTIONS Question 1. An object has moved through a distance. Can it have zero displacement ? If yes, support your answer with an example. (CBSE 2015) Answer: Yes, The displacement of the object can be zero. Let a boy completes one round of a circular track in 5 minutes. The […]
Chapter 7 Diversity in Living Organisms
Chapter 7 Diversity in Living Organisms TEXT BOOK QUESTIONS Question 1. Why do we classify organisms ? (CCE 2012) Answer: Identification is not possible without any system of classification. Classification helps in bringing out similarities and dissimilarities amongst organisms. Relationships are built up with the help of classification. They indicate the evolutionary pathways. Organisms of […]
Chapter 6 Tissues
Chapter 6 Tissues TEXT BOOK QUESTIONS Question 1. What is a tissue ? Answer: Tissue is a group of related cells that have a common origin and perform a common function. Question 2. What is the utility of tissues in multicellular organisms ? Answer: Division of Labour: Tissues bring about division of labour in multicellular […]
Chapter 5 The Fundamental Unit of Life
Chapter 5 The Fundamental Unit of Life TEXT BOOK QUESTIONS Question 1. Who discovered cell, and how ? Answer: Robert Hooke (1665). He thinly pared a piece of cork and observed it under his self made primitive microscope. The scientist found that cork possesses a number of small box-like structures which he named cells (cellulae […]
Chapter 4 Structure of the Atom
Chapter 4 Structure of the Atom IN TEXT PROBLEMS Question 1. What are canal rays ? Answer: Canal rays also called anode rays, are seen moving from the anode towards the cathode in the specially designed discharge tube. However, they do not originate from the anode. Question 2. If an atom contains one electron and […]
Chapter 3 Atoms and Molecules
Chapter 3 Atoms and Molecules IN TEXT PROBLEMS Question 1. In a reaction, 5.3 g of sodium carbonate reacted with 6.0 g of ethanoic acid. The products were 2.2 g of carbon dioxide, 0.9 g of water and 8.2 g of sodium ethanoate. Show that these observations are in agreement with the law of conservation […]
Chapter 2 Is Matter Around Us Pure
Chapter 2 Is Matter Around Us Pure In Text Questions Question 1. What is meant by a pure substance? Answer: In terms of science, a pure substance may be defined as a single substance or matter which cannot be separated into other kinds of matter by any physical process. All pure elements and compounds are […]
Chapter 1 Matter in Our Surroundings
Chapter 1 Matter in Our Surroundings IN TEXT PROBLEMS Question 1. Which of the following are matter ? Chair, air, love, smell, hate, almonds, thought, cold, cold drink, smell of perfume. Answer: Chair, air, smell, almonds, cold drink, smell of perfume are matter. Please note that the smell whether pleasant or foul is due to […]
Chapter 15 Probability Ex 15.1 eng
Chapter 15 Probability Ex 15.1 Question 1. In a cricket match, a batswoman hits a boundary 6 times out of 30 balls she plays. Find the probability that she did not hit a boundary. Solution: Question 2. 1500 families with 2 children were selected randomly, and the following data were recorded Compute the probability of […]