What are ultrasonic waves?

(A) Sound waves having frequancy higher than audio frequancy range
(B) Sound waves having frequancy shorter than audio frequancy range
(C) Sound waves produced in a vacume
(D) None of these

Mercury is commonly used as a thermometric fluid rather than water because?

(A) Spacific heat of mercury is less than water
(B) Spacific heat of mercury is more than water
(C) Mercury has grater visibility than water
(D) None of these

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