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 […]
Chapter 7 Conservation of Plants and Animals
Chapter 7 Conservation of Plants and Animals Textbook Questions Question 1. Fill in the blanks. (a) A place where animals are protected in their natural habitat is called ______ (b) Species found only in a particular area is known as ______ (c) Migratory birds fly to faraway places because of ________ changes. Answer: (a) Wildlife […]
Chapter 6 Combustion and Flame
Chapter 6 Combustion and Flame Textbook Questions Question 1. List conditions under which combustion can take place. Answer: Combustion can take place in the presence of: (a) a combustible substance. (b) oxygen, that is, the supporter of combustion. (c) attainment of ignition temperature of the substance. Question 2. Fill in the blanks. (a) Burning of […]
Chapter 5 Materials Coal and Petroleum
Chapter 5 Materials Coal and Petroleum Textbook Questions Question 1. What are the advantages of using CNG and LPG as fuels? Answer: The advantages of using CNG and LPG as fuels are: They burn with a smokeless flame and so does not cause any pollution. They leave no ash on burning. They are easy to […]
Chapter 4 Materials Metals and Non Metals
Chapter 4 Materials Metals and Non Metals Textbook Questions Question 1. Which of the following can be beaten into thin sheets? (a) Zinc (b) Phosphorus (c) Sulphur (d) Oxygen Answer: (a) Zinc Question 2. Which of the following statements is correct? (a) All metals are ductile. (b) All non-metals are ductile. (c) Generally, metals are […]