Chapter 16 Floatation
Chapter 16 Floatation TEXT BOOK QUESTIONS Question 1. Why is it difficult to hold a school bag having a strap made of a thin and strong string ? Answer: It is painful to hold a heavy bag having strap made of a strong and thin string. When we hold a heavy bag having strap made of […]
Chapter 15 Improvement in Food Resources
Chapter 15 Improvement in Food Resources TEXT BOOK QUESTIONS Question 1. What do we get from cereals, pulses, fruits and vegetables ? Answer: Cereals: Mostly carbohydrates Pulses: Mostly proteins Fruits: Vitamins, minerals, organic acids. Vegetables: Vitamins, minerals, small quantities of proteins, carbohydrates and oil. Question 2. How do biotic and abiotic factors adversely affect crop […]
Chapter 14 Natural Resources
Chapter 14 Natural Resources TEXT BOOK QUESTIONS Question 1. How is our atmosphere different from the atmosphere of Venus and Mars ? Answer: Atmosphere over Earth Atmosphere over Venus and Mars 1. Nitrogen and Oxygen. It contains nitrogen and oxygen. The two are absent 2. Carbon Dioxide. Carbon dioxide content is little (0-03%). Carbon dioxide […]
Chapter 13 Why Do we Fall Ill
Chapter 13 Why Do we Fall Ill TEXT BOOK QUESTIONS Question 1. State any two conditions essential for good health. Complete physical fitness free from any disease. Perfect mental (and social) well being. Answer: State any two conditions essential for being free of disease. Non-overcrowded living conditions, safe drinking water and clean environment. Balanced diet, […]
Chapter 12 Sound
Chapter 12 Sound TEXT BOOK QUESTIONS Question 1. Explain how sound is produced by your school bell. Or Sound is produced when your school bell […]
Chapter 11 Work, Power and Energy
Chapter 11 Work, Power and Energy TEXT BOOK QUESTIONS Question 1. A force of 7 N acts on an object. The displacement is say 8 m in the direction of the force. Let us take it that the force acts on the object through the displacement. What is the work done in this case ? […]
Chapter 10 Gravitation
Chapter 10 Gravitation TEXT BOOK QUESTIONS Question 1. State the universal law of gravitation. (CBSE Sample Paper, CBSE 2010, 2011, 2012, 2013, 2015) Answer: The force of attraction between two particles or objects is directly proportional to the product of the masses of the objects and inversely proportional to the square of the distance between […]
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 […]