Class 9 | Science | Chapter 14| Natural Resources | NCERT Solutions Page 193 1. How is our atmosphere different from the atmospheres on Venus and Mars? Earth's atmosphere Venus and mars atmosphere It is a mixture of nitrogen, oxygen, carbon dioxide and small amount of other gases. It mainly consist of carbon dioxide. Life is possible in earth's … [Read more...] about Chapter 14 Natural Resources
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Chapter 13 Why do we fall ill ?
Class 9 | Science | Chapter 13| Why do we fall ill | NCERT Solutions Page 178 1. State any two conditions essential for good health. Answer: Health is a state of complete physical, mental and social well being. The two conditions essential for good health are 1) We need food for health and food will have to earn by doing work.For this, opportunity to do work … [Read more...] about Chapter 13 Why do we fall ill ?
Chapter 12 Sound
Class 9 | Science | Chapter 12 |Sound| NCERT Solutions Page 162 1. How does the sound produced by a vibrating object in a medium reach your ear? Answer: When an object vibrates it forces the neighbouring particles of the medium to vibrate.These vibrating particles then forces the particles adjacent to them to vibrate.In this way, vibrations produced by an vibrating … [Read more...] about Chapter 12 Sound
Chapter 11 Work and Energy
Class 9 | Science | Chapter 11 |Work and Energy| NCERT Solutions Question Answers, Page 148 1. A force of 7 N acts on an object. The displacement is, say 8 m, in the direction of the force (Fig. 11.3). Let us take it that the force acts on the object through the displacement. What is the work done in this case? Answer: Work done = Force × Displacement W= F × … [Read more...] about Chapter 11 Work and Energy
Chapter 10 Gravitation
Class 9 | Science | Chapter 10 |Gravitation| NCERT Solutions Question Answers, Page 134 1. State the universal law of gravitation. Answer: This law states that every body in the universe attracts every other body with a force which is directly proportional to the product of their masses and inversely proportional to square of distance between them. G m1 … [Read more...] about Chapter 10 Gravitation
Chapter 9 Force and Law of Motion
Class 9 | Science | Chapter 9 |Force and Law of Motion| NCERT Solutions Question Answers Page 118 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 rupees coin and a one-rupee coin? Answer : Inertia is the measure of mass of the body.The greater is the mass of a body, greater is … [Read more...] about Chapter 9 Force and Law of Motion
Chapter 8 Motion
Class 9 | Science | Chapter 8 |Motion| NCERT Solutions Page 100 1. An object has moved through a distance. Can it have zero displacement? If yes, support your answer with an example. Answer: Displacement is the shortest distance between initial and final position of body along with direction.Yes, an object moved through a distance can have zero displacement. For Ex: … [Read more...] about Chapter 8 Motion
Chapter 7 Diversity in Living Organisms
Class 9 | Science | Chapter 7 |Diversity in Living Organisms| NCERT Solutions Page 80 1. Why do we classify organisms? Answer: There are millions of organism or species on earth.It is very difficult to study all of them one by one.The method of arranging organism into groups or sets on the basis of similarities and differences is called classification. Classification … [Read more...] about Chapter 7 Diversity in Living Organisms
Chapter 6 Tissues
Class 9 | Science | Chapter 6 |Tissues| NCERT Solutions Page 69 1. What is a tissue? Answer: Tissue is a group of cells that are similar in structure and are organised together to perform a specific task. 2. What is the utility of tissues in multi-cellular organisms? Answer: In multicellular organisms, cells are grouped to form tissues. These tissues are … [Read more...] about Chapter 6 Tissues
Chapter 4 Structure of the Atom
Class 9 | Science | Chapter 4|Structure of the Atom | NCERT Solutions Page 47 1. What are canal rays? Answer: Canal rays are positively charged radiations. These rays consist of positively charged particles known as protons. They were discovered by Gold stein in 1886. 2. If an atom contains one electron and one proton, will it carry any charge or … [Read more...] about Chapter 4 Structure of the Atom