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 objects … [Read more...] about Chapter 12 Sound
solutions
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 × S W = … [Read more...] about Chapter 11 Work and Energy
Chapter 5 The Fundamental Unit of Life
Class 9 Science Chapter 5 The Fundamental Unit of Life NCERT Solutions Page 59 1. Who discovered cells, and how? Answer: Cells were discovered in 1665 by an English Botanist, Robert Hooke. He used a primitive microscope to observe cells in a cork slice. 2. Why is the cell called the structural and functional unit of ? Answer: Cell is the smallest unit of life … [Read more...] about Chapter 5 The Fundamental Unit of Life
Chapter 9 Reproduction in Animals
Class 8 Science Chapter 9 | Reproduction in Animals NCERT Solutions 1. Explain the importance of reproduction in organisms. The production of new organism from the existing organism of the same species is known as reproduction. Reproduction is the creation of new living things. It is essential for the survival of species on this earth. So, living organism produce more … [Read more...] about Chapter 9 Reproduction in Animals
Chapter 8 Cell Structure and Functions
Class 8 Science Chapter 8 | Cell Structure and Functions NCERT Solutions 1. Indicate whether the following statements are True (T) or False (F). (a) Unicellular organisms have one-celled body. (T/F) (b) Muscle cells are branched. (T/F) (c) The basic living unit of an organism is an organ. (T/F) (d) Amoeba has irregular shape. (T/F) Answer: (a) Unicellular organisms … [Read more...] about Chapter 8 Cell Structure and Functions