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  9. Q71

UKPSC PCS 2010 · Question 71 of 138

The heat required in calories to convert 1 gram of ice at 0º C to string at 1º C is approximately

Science

  1. A80
  2. B336
  3. C720Correct
  4. D620

Answer: C. 720

Explanation

80 (fusion) + 100 (heating to 100C) + 540 (vaporisation) = 720 calories.

Source: UKPSC Lower PCS Prelims 2010 (Combined Lower Subordinate Services Exam), held 2011

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