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Living science Heat and its effect questions with answer Ratna Sagar Publication For CPS Samastipur A. MUCUPLE-CHICE QUESTIONS: Choose the most appropriate answer. 1. Heat causes  a. change of state. b. change of temperature. c. expansion. d. all of these Ö 2. Heat causes expansion because  . heat occupies space.        b. of increase in the movement of molecules Ö c. matter tries to escape from the heat. .  d. none of the above is true—it is not yet known why heat causes expansion. 3. Which of these will expand the most on heating?         a. gold              b. water            C. mercury        d. air Ö 4. 0 0 C is the same temperature as  a. 0 °F b. 212 "F. c. 32 °F Ö  d. 100 °F. 5. A bimetallic strip is made of metals M1 and M2. On cooling through the same temperature, M 1 contracts more than M 2  When the strip is heated, it will a. bend towards M 1 .      b. bend towards M 2 . Ö     c. not bend at all.          d. direction of bending

MORE TO KNOW  1. Australian scientists have invented a way of removing wool from Sheep without shearing.  The new wool harvest technology is called Bioclip . 2. Pure silk is one of the finest natural fi bres and is said to be the “queen of fi bres” 3. It is believed that silk was fi rst discovered in China by the Empress Si Ling Chi 4. India is the world’s second largest producer of Silk.    Kancheepuram, Siruvanthadu,Thirubhuvanam and Arani are famous for silk in Tamil Nadu. 5. The types of silk are  1. Mulberry silk             2. Tassar silk                 3. Eri silk         4. Muga silk                  6. Composition of Honey.     Sugar - 75%           Water - 17%       Minerals - 8% 7. There are three kinds of bees in a bee hive.  a.. The queen bee ( fertile female bee).       b. The drones (fertile malebees)    c. The workers (sterile female bees) 8 The rearing of honey bees to produce honey in large scale is kno

Solution of chapter Heat and Temperature Basic science Class 7 A. Answer these question in not more than 20 words 1. Give an example to show that heat is a form of energy? Answer: When we heat a pan of water, the water boils and at its temperature rises. The energy for this rise in temperature comes from heat. This shows that heat is a form of energy. 2. What is temperature? Name the scale used to measure it? Answer: Temperature of a body is the measure of the hotness or coldness of the body. Celsius and Fahrenheit are the scales used to measure temperature. Thermometry is branch of physics which deals with the measurement of temperature. 3. If hotness and coldness of a body is relative, how do we measure its degree of hotness? Answer: We measure the degree of hotness or coldness of a body by measuring its temperature and comparing with standard temperature scale. 4. Mention three things that heat causes in substance? Answer: Following are the three changes that hea

Nutrition in animals  Holozoic nutrition: It is a method of nutrition that involves the ingestion of liquid or solid organic material. It involves different steps namely, ingestion, digestion, absorption, assimilation and egestion. Human beings exhibit holozoic mode of nutrition involving five basic steps. Digestion: Digestion is the process by which complex food is broken down into simple absorbable form. Digestion of food starts from mouth and ends in small intestine Digestive system is made up of alimentary canal and associated glands. Digestive system in human beings: Digestive system in human beings is formed by alimentary canal and digestive glands. Parts of alimentary canal: It comprises different parts like mouth, oesophagus, stomach, small intestine and large intestine. It starts with mouth and ends with anus.  ingestion   The process of taking in food through mouth is called as ingestion. Mastication Teeth help in the process of mastication. Mastication is the proc

Wind Storm and Cyclone :Natural Phenomena: 7th class Hots Questions Question: 1. Why are people advised not to stand near fast moving train? Ans: When train moves with high speed it creates region of lower pressure . This low pressure push man towards the train Question: 2. Why are holes made in huge hoardings? Explain their usefulness. Ans: Holes are made in huge hoardings to reduce air pressurecausing it to flutter or blown away. Question: 3. in winter regions near, why does wind blow from land to sea? Ans:. In winter the sea become warmer quickly than the land. So In winter monsoon blows from land to sea Question: 4. Why are things colorful in appearance? Ans: The colour of object is colour that is reflected. Thus different coulor makes things colourfull. Question: 5. Fill the missing word in the blank spaces in the following statements: (a) Wind is moving air. (b) Winds are generated due to uneven heating on the earth. (c) Near the earth’s surface warm ai

Question: What do you understand by animal nutrition? Answer : Animal nutrition includes requirement of nutrients, mode of intake of food, and its utilization in the body. Question:  What are the main steps of digestion in humans? Answer :  The main steps of digestion in humans are --- (1)  Ingestion (2)  Digestion (3)  Absorption (4)  Assimilation (5)  Egestion Question: What is digestion? Answer :  The breakdown of complex components of food such as carbohydrates into simpler substances is called digestion Question: Name the process of taking in food? Answer :  Ingestion. Question: What are the different modes of taking food into the body in different organisms. Answer : Bees and humming-birds suck the nectar of plants Bees and   humming-birds suck the nectar of plants Snakes like the python swallow the animals they prey upon. Some aquatic animals filter tiny food particles floating nearby and feed upon them. Question: What are