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Red Light is used as a dancer signal because

A. it is pleasing to the eye

B. it has a traditional colour

C. it is easily distinguishable

D. it is most sensitive to the human eye

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  13. At what temperature do the Fahrenheit and Celsius scales give the same reading?
  14. In the fuse of an electrical installation blows out
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  16. Water has maximum density at
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  18. A star contains
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  20. A radio set that uses valves does not start operating immediately when it is switched on whereas a set…
  21. The cover of a solar cooker is made of glass because
  22. The attraction of unlike molecules at the common surface is known as
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  25. The neutron, one of the constituent particles of which the nuclei of atoms are composed was discovered…
  26. The function of a moderator in a nuclear reactor is
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