Materials And Components - Study Mode
[#116] Which of the following pairs of crystal structure possesses the same atomic packing density?
Correct Answer
(C) face centered cubic & hexagonal close packed
[#117] Super conductivity can be destroyed by
Correct Answer
(D) by increasing temperature
[#118] The electrical conductivity of a semiconductor increases with increase in temperature because
Correct Answer
(B) The carrier concentration increases
[#119] As temperature falls below the transition temperature, the value of critical magnetic field of superconductor
Correct Answer
(B) Increases
[#120] Which of the following statements are correct for superconductors? 1. A substance loses its electrical resistance below certain temperature. 2. Superconducting elements have greater electrical resistivity at room temperature. 3. On adding impurities to super conducting elements its transition temperature is increased.
Correct Answer
(C) 1 and 3 only