Chapter 13 Sound
Chapter 13 Sound Textbook Questions Question 1. Choose the correct answer. Sound can travel through (a) gases only (b) solids only (c) liquids only (d) solids, liquids, and gases Answer: (d) solids, liquids, and gases. Question 2. Voice of which of the following is likely to have a minimum frequency? (a) Baby girl (b) Baby […]
Chapter 18 Pollution of Air And Water
Chapter 18 Pollution of Air And Water Textbook Questions Question 1. What are the different ways in which water gets contaminated? Answer: Following are the ways by which water gets contaminated: People dispose of garbage in the water. Many industries discharge their harmful chemicals directly into rivers and streams. Chemical fertilisers, pesticides and weedicides used […]
Chapter 17 Stars and The Solar System
Chapter 17 Stars and The Solar System Textbook Questions Choose the correct answer in Questions 1-3. Question 1. Which of the following is NOT a member of the solar system? (a) An asteroid (b) A satellite (c) A constellation (d) A comet Answer: (c) A constellation Question 2. Which of the following is NOT a […]
Chapter 16 Light
Chapter 16 Light Textbook Questions Question 1. Suppose you are in a dark room. Can you see objects in the room? Can you see objects out¬side the room? Explain. Answer: When we are in a dark room then we cannot see objects in the room. We can see the objects outside the room, because out […]
Chapter 15 Some Natural Phenomena
Chapter 15 Some Natural Phenomena Textbook Questions Select the correct option in Questions 1 and 2. Question 1. Which of the following cannot be changed easily by friction? (a) A plastic scale (b) A copper rod (c) An inflated balloon (d) A woollen cloth Answer: (b) A copper rod Question 2. When a glass rod […]
Chapter 14 Chemical Effects of Electric Current
Chapter 14 Chemical Effects of Electric Current Textbook Questions Question 1. Fill in the blanks. (a) Most liquids that conduct electricity are solutions of ______ , ______ and ______ (b) The passage of an electric current through a solution causes _______ effects. (c) If you pass current through copper sulphate solution, copper gets deposited on […]
Chapter 11 Force and Pressure
Chapter 11 Force and Pressure Textbook Questions Question 1. Give two examples each of the situations in which you push or pull to change the state of motion of objects. Answer: (i) Push: We close drawer by pushing. We move a wooden box by pushing. (ii) Pull: We draw water from a well by pulling […]
Chapter 10 Reaching The Age of Adolescence
Chapter 10 Reaching The Age of Adolescence Textbook Questions Question 1. What is the term used for secretions of endocrine glands responsible for changes taking place in the body? Answer: Hormones Question 2. Define adolescence. Answer: The period of life, when the body undergoes changes, leading to reproductive maturity, is called adolescence. The period of […]
Chapter 9 Reproduction in Animals
Chapter 9 Reproduction in Animals Textbook Questions Question 1. Explain the importance of reproduction in organisms. Answer: Reproduction is a vital phenomenon on this planet earth which is essential for existence and continuity of life and species on it, generation after generation. Question 2. Describe the process of fertilisation in human beings. Answer: In the […]
Chapter 8 Cell Structure and Functions
Chapter 8 Cell Structure and Functions Textbook Questions Question 1. Indicate whether the following statements are True (T) or False (F). (a) Unicellular organisms have a one-celled body. (b) Muscle cells are branched. (c) The basic living unit of an organism is an organ. (d) Amoeba has an irregular shape. Answer: (a) True (b) True […]