Exercise: Materials And Components

Questions for: Materials And Components

Consider the following statement: In case of a superconductor
  1. B = 0
  2. μr is high
  3. diamagnetism is high
  4. transition temperature varies with isotopic mass.
Of the above statements
A:
1 and 2 are correct
B:
2, 3, 4 are correct
C:
1, 3, 4 are correct
D:
2, 4 are correct
Answer: C
No answer description is available. Let's discuss.
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As per Matthiessen's rule, the total resistivity r of a conductor can be written as r = ri + aT, where ri and a are constants and T is absolute temperature. At very low temperatures
A:
aT = 0
B:
aT > ri
C:
aT ∼ ri
D:
aT < ri
Answer: D

At very low temperatures a T → 0. Since resistivity has a finite value even at low temperature, a T < ri.

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The relation between thermal conductivity K (W/m/°C), heat flow density Q (watt/m2) and dT/dx (°C per metre) is
A:
Q = K(dT/dx)
B:
Q = - K(dT/dx)
C:
K = Q(dT/dx)
D:
dT/dx = - QK
Answer: B
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If a metal specimen has n valence electrons per m3 each having charge e and mass m and t is the relaxations time, the conductivity is
A:
B:
C:
D:
Answer: B
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Magnetic hysteresis phenomenon is explained by
A:
motion of domain walls
B:
motion of domain walls and domain rotation
C:
domain rotation
D:
none of the above
Answer: B
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