18. A mercury drop of 1 cm radius is broken into
106 small drops. The energy used will be (surface tension of mercury is 35 x10-3N/cm
(a) 4.4 x 10-3 j
(b) 2.2 x 10-4 j
(c) 8.8 x 10-4 j
(d) 104 j
Ans. a
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a