General Science Test 21

General Science

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1. A smoked metal ball, when dipped in water appears to shine brightly. Which of the following phenomena of light is responsible for this ?


2. Why does a dead body float in water after some time ?


3. Why the hair of a painting brush stick together when taken out of water ?


4. Why human breath is visible in winter but not in summer


5. Why steam causes more severe burns than boiling water ?


6. Why a small space is left between each of the two rails of a railway line ?


7. Why water, to which alcohol is addz!d, ii applied on the forehead of a person having high fever ‘?


8. Why a clean and dry needle floats when put gently on the surface of water ?


9. lee floats on water but sinks in alcohol why


10. Why is it more comfortable to swim in sea water than in river ?


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