68. Oxygengas is filled in a vessel. If pressure is doubled, temperature becomes four times. How many times its density will become
(a) 2 (b) 4
(c) 1/4 (d) 1/2
Answer-d
(9)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (126)