GENERAL THOUGHT QUESTIONS FOR 

 DISCUSSION AND REVIEW 



GROUP IV 



1. Mention one important value of science to you personally. Give at 

 least one good reason for your answer. 



2. Mention a fire hazard that may exist in (a) the home, (b) the school, 

 (c) some public meeting building. Tell what means should be taken to 

 eliminate each hazard. 



3. By aid of labeled drawings or blackboard sketches, tell how you have 

 proved the following statement: Water exerts pressure. State what 

 you did, tell step by step what happened, and give your conclusion. 



4. Do metals expand when heated? Give an illustration to prove your 

 answer. 



5. Why is it easier to tip over a canoe containing a standing person than 

 one containing a sitting person? 



6. Name six common instruments that use the principle of the lever. 

 State the class of lever in each case. 



7. Why does an electric bulb filled with gas get hotter than one contain- 

 ing a vacuum? 



8. How can a heavy boy and a light girl sit on a see-saw so that it will 

 balance exactly? 



9. Is it safe for an ocean-going steamer, loaded to full capacity, to ascend 

 a fresh water stream? Why? 



10. Why do we oil machinery? 



11. Why does an airplane motor sometimes stop when a very high eleva- 

 tion is reached? 



12. Why does the rear of an automobile get more dusty than the front? 



13. Show, by labeled drawing or blackboard sketch, how you have demon- 

 strated the action of some device that uses atmospheric pressure. Tell 

 briefly (a) what was done, (b) what happened, (c) your conclusions. 



14. Is it true or false that heat dries up water? Why? 



15. Complete this statement: Water rises in a coffee percolator because 



16. Is it true or false that there is less eyestrain in reading print on 

 glazed paper than on unglazed paper? Why? 



17. Why do some clouds look white and others very dark? 



18. What causes the sharp crack heard when a bat hits a ball? 



19. Show by labeled drawing, on paper or blackboard, how you have 

 demonstrated the circulation of water by convection currents. Tell 

 briefly (a) what was done, (b) what happened and (c) your con- 

 clusions. 



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