1
AIEEE 2004
MCQ (Single Correct Answer)
+4
-1
A piece of copper and another of germanium are cooled from room temperature to $$77K,$$ the resistance of
A
copper increases and germanium decreases
B
each of them decreases
C
each of them increases
D
copper decreases and germanium increases
2
AIEEE 2004
MCQ (Single Correct Answer)
+4
-1
The work function of a substance is $$4.0$$ $$eV.$$ The longest wavelength of light that can cause photo-electron emission from this substance is approximately.
A
$$310$$ $$nm$$
B
$$400$$ $$nm$$
C
$$540$$ $$nm$$
D
$$220$$ $$nm$$
3
AIEEE 2004
MCQ (Single Correct Answer)
+4
-1
When $$p$$-$$n$$ junction diode is forward biased then
A
both the depletion region and barrier height are reduced
B
the depletion region is widened and barrier height is reduced
C
the depletion region is reduced and barrier height is increased
D
both the depletion region and barrier height are increased
4
AIEEE 2004
MCQ (Single Correct Answer)
+4
-1
The manifestation of band structure in solids is due to
A
Bohr's correspondence principle
B
Pauli's exclusion principle
C
Heisenberg's uncertainty principle
D
Boltzmann's law

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