Current Electricity | Practice MCQs Physics for Mdcat | mosaicbro.com
Current Electricity | Practice MCQs Physics for Mdcat
7 of 85 questions
(Page 6 of 13)
Filter by Category
Quiz Settings
(Max: 85 questions available)
(0 for no time limit)
Hold Ctrl/Cmd to select multiple categories. If none selected, all questions will be considered.
00:00
Question 1 of 0
Your Score: 0%
0
Correct
0
Incorrect
0
Unanswered
Review Answers:
36
The resistance of a conductor at absolute zero is:
Correct Answer:A
Explanation:
For superconductors, resistance drops to zero at absolute zero.
37
A good electrical conductor has:
Correct Answer:A
Explanation:
Good conductors have low resistivity ($\rho$) and high conductivity ($\sigma$).
38
Resistivity of the typical metal increases:
Correct Answer:A
Explanation:
Metals show increased resistivity with temperature due to lattice vibrations.
39
The resistivity of a class of elements at critical temperature “T_c” falls to zero, such elements (or materials) are called:
Correct Answer:B
Explanation:
Superconductors exhibit zero resistivity below their critical temperature.
40
The temperature at which the value of resistivity falls to zero is called:
Correct Answer:C
Explanation:
Critical temperature ($T_c$) is the threshold for superconductivity.
41
The phenomenon that the resistance of a metal falls exactly to zero at a few degrees above absolute zero is called:
Correct Answer:C
Explanation:
Superconductivity is the phenomenon of zero resistance below $T_c$.
42
In a laboratory of Zurich, two scientists Bednorz and Mueller observed that certain ceramic materials exhibit super-conductivity at much higher temperature, that is at:
Correct Answer:C
Explanation:
Bednorz and Mueller discovered high-temperature superconductivity in ceramics at ~40K.