Tiêu đề VIII Science QP.pdf ✅

9. Knives, needles, saws are made sharp or pointed to: A. decrease pressure B. increase pressure C. can’t say D. none of these OR All the objects present in universe are bounded with a force called_______. A. Electrostatic force B. Muscular force C. Gravitational force D. Contact force 1 10. The easiest way to move a heavy wooden crate is to: A. place it on a trolley B. tie a rope on one end and pull C. push it D. none of these 1 Section – B: Very Short Answer Type Questions 11. a) Name the bacteria that has a symbiotic relationship with above plant. b) What is the role of this bacteria. 2 12. Match the organisms in Column A with their action in Column B: Column A Column B i. Lactobacillus a) causing AIDS ii. Yeast b) causing malaria iii. A protozoan c) baking of bread iv. A virus d) fixing nitrogen e) setting of curd 2 13. a) What does the above figure illustrate? b) If you drill another similar hole at point X then the stream of water that will come out of this hole will have less pressure or more pressure as compared to the streams of water shown in the figure. 2 14. Expand PCRA. What are its advices? Write any two. OR Why should we use coal and petroleum very judiciously? 2