UGC NET Physical Sciences Model Paper

PHYSICAL SCIENCES
This Test Booklet will contain 65 (20 Part `A‟+20 Part `B+25 Part „C‟) Multiple Choice Questions (MCQs). Candidates will be required to answer 15 in part „A‟, 20 in Part „B‟ and 10 questions in Part C respectively(No. of question to attempt may vary from exam to exam). In case any candidate answers more than 15, 20 and 10 questions in Part A, B and C respectively only first 15, 20 and 10 questions in Parts A, B and C respectively will be evaluated. Each questions in Part `A‟ carries two marks, Part „B‟ 3.5 marks and Part „C‟ 5 marks respectively. There will be negative marking @25% for each wrong answer. Below each question, four alternatives or responses are given. Only one of these alternatives is the „CORRECT‟ answer to the question.

1.A piece of metal of heat capacity 500 JK–1assumed to be independent of temperature is at 500 K. The metal piece is cooled to 300K in two steps: it is first plunged into a liquid bath at 400 K. After cooling it is plunged into a colder liquid bath at 300 K. The metal piece is then heated to 500 K in two steps: it is plunged into a liquid bath at 400 K first and then into a liquid bath at 500 K. During the cooling-heating process, the metal piece and the liquid baths gain or lose entropy. The total change in entropy of the system (the metal piece and the liquid baths) is
1. 1500 ln (5/3)JK-1
2. Zero
3. –200 JK–1
4. +200JK

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