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IIT JEE Advanced 2010 Paper 1

Paragraph Type
This section contains 2 paragraphs. Based on the first paragraph 2 multiple choice questions and based on the second paragraph 3 multiple choice questions have to be answered. Each of these questions has 4 choices (A), (B), (C) and (D) out of which ONLY ONE is correct.
Paragraph for Questions 14 and 15:
Electrical resistance of certain materials, known as superconductors, changes abruptly from a non- zero value to zero as their temperature is lowered below a critical temperature Tc (0). An interesting property of superconductors is that their critical temperature becomes smaller than Tc(0), if they are placed in a magnetic field, that is, the critical temperature Tc(B) is a function of the magnetic field strength B. The dependence of Tc(B) on B is shown in the figure.

Question : 15

Total: 84

A superconductor has Tc (0) = 100K. When a magnetic field of 7.5 T is applied, its Tc decreases to 75 K. For this material, one can definitely say that when

B = 5 T , Tc B = 80K
B = 5 T , 75 K < Tc B <100K
B =10 T , 75K < Tc <100K
B = 10, Tc = 70 c K

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