CBSE ADDA

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