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1
AIPMT 2005
MCQ (Single Correct Answer)
+4
-1
Carbon, silicon and germanium atoms have four valence electrons each. Their valence and conduction bands are separated by energy band gaps represented by (Eg)C, (Eg)si and (Eg)Ge respectively. Which one of the following relationships is true in their case?
A
(Eg)C > (Eg)Si
B
(Eg)C < (Eg)Si
C
(Eg)C = (Eg)Si
D
(Eg)C < (Eg)Ge.
2
AIPMT 2005
MCQ (Single Correct Answer)
+4
-1
Copper has face centered cubic (fcc) lattice with interatomic spacing equal to 2.54 $$\mathop A\limits^ \circ $$. The value of lattice constant for this lattice is
A
2.54 $$\mathop A\limits^ \circ $$
B
3.59 $$\mathop A\limits^ \circ $$
C
1.27 $$\mathop A\limits^ \circ $$
D
5.08 $$\mathop A\limits^ \circ $$
3
AIPMT 2005
MCQ (Single Correct Answer)
+4
-1
In a p-n junction photo cell, the value of the photo-electromotive force profuced by monochromatic light is proportional to
A
The barrier voltage at the p-n junction.
B
The intensity of the light falling on the cell.
C
The frequency of the light falling on the cell.
D
The voltage applied at the p-n junction.
4
AIPMT 2004
MCQ (Single Correct Answer)
+4
-1
The peak voltage in the output of a half wave diode rectifier fed with a sinusoidal signal without filter is 10 V. The d.c. component of the output voltage is
A
(10/$$\sqrt 2 $$) V
B
$$\left( {{{10} \over \pi }} \right)V$$
C
10 V
D
(20/$$\pi $$) V
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