At a temperature of about 1 K, aluminium is a conductor insulator photoconductor

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Question
At a temperature of about 1 K, aluminium is a
Options
A. conductor
B. insulator
C. photoconductor
D. superconductor

Correct Answer

superconductor

Materials and Components problems

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3. In a specimen of silicon steel, a field strength of 200 A/m causes a flux density of 0.5 T. In a specimen of cast iron, the same H would cause B to be
Options
A. 0.5 T
B. less than 0.5 T
C. more than 0.5 T
D. 0.5 T or more or less

5. As per Bohr's postulate, only those circular orbits are stable for which the angular momentum is equal to an integer times .
Options
A. True
B. False

6. For a multiplate capacitor having n plates, A as area of each plate, the capacitance is proportional to
Options
A. n A
B. (n - 1) A
C. (n + 1) A
D.

9. The electric dipole moment of a neutral system of point charges Q₁, Q₂.... is Q_ir_i . The charges Q_i
Options
A. must be all positive
B. must be all negative
C. must be such that Q_i = 0
D. either (a) or (b)

10. If m, v, r are the mass, velocity and radius of orbit of electron and h is Planck's constant, quantum condition for electron's orbit is
Options
A.
B.
C.
D.

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