GATE (Graduate Aptitude Test in Engineering) Physics: Questions 279 - 281 of 659

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Question 279

Appeared in Year: 2010

Question

MCQ▾

To detect trace amount of a gaseous species in a mixture of gases, the preferred probing tools is –

Choices

Choice (4)Response

a.

ESR spectroscopy

b.

Laser spectroscopy

c.

NMR spectroscopy

d.

Ionization spectroscopy with – rays

Question 280

Appeared in Year: 2010

Question

MCQ▾

The thermal conductivity of a given material reduces when it undergoes a transition from its normal state to the superconducting state. The reason is

Choices

Choice (4)Response

a.

The heat capacity increases on transition to the superconducting state leading to a reduction in thermal conductivity.

b.

Upon the formation of Cooper pairs, the lattice becomes less efficient in heat transfer

c.

The Cooper pairs cannot transfer energy to the lattice

d.

The electrons in the normal state lose their ability to transfer heat because of their coupling to Cooper pairs

Question 281

Appeared in Year: 2010

Question

Match List-Ⅰ List-Ⅱ▾

Match the reaction on the left with the associated interactions on the right.

List-ⅠList-Ⅱ
(A)

(i)

(B)

(ii)

(C)

(iii)

Electromagnetic

Choices

Choice (4)Response
  • (A)
  • (B)
  • (C)

a.

  • (iii)
  • (ii)
  • (i)

b.

  • (iii)
  • (i)
  • (ii)

c.

  • (i)
  • (ii)
  • (iii)

d.

All of the above

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