18 . In which of the following materials speed of sound is maximum?                           (   )

 

(a) Iron (b) Sea water (c) Fresh water (d) Air

 

19. Which of the following cannot be charged easily by friction?                                   (   )

 

(a) A plastic scale (b) An inflated balloon (c) A copper rod (d) A woollen cloth

 

20. The splitting of white light into its seven constituent colours is called                     (   )

 

(a) Dispersion (b) Reflection (c) Refraction (d) Rectilinear propagation

18.

19.(c) A COPPER ROD

20.(a) DISPERSION 
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18) Iron 
19) A copper rod
20) Dispersion
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18-a
19-c
20-a
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19-A COPPER ROD
20-DISPERSION
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Q-18-a. Q-19-c. Q-20-a
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In which of the following materials speed of sound is maximum
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