One of four words is a class to which the other three belong. Identify the class.
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___ is not related to gases.
Calculate the time period (in seconds) of a sound wave of wavelength 5m travelling with a speed of 500 m/s.
___ is known as a disease mostly caused by occupational health hazards.
What is the valency of magnesium?
Which cricketer is not in the list of ICC Cricket Hall of Fame?
A series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series.
NOA, PQB, RSC, ?
Who has the distinction of serving as the Chief Justice of India, President and the Vice president?