1
AIPMT 2007
MCQ (Single Correct Answer)
+4
-1
Which one of the following represents forward bias diode ?
A
AIPMT 2007 Physics - Semiconductor Electronics Question 109 English Option 1
B
AIPMT 2007 Physics - Semiconductor Electronics Question 109 English Option 2
C
AIPMT 2007 Physics - Semiconductor Electronics Question 109 English Option 3
D
AIPMT 2007 Physics - Semiconductor Electronics Question 109 English Option 4
2
AIPMT 2007
MCQ (Single Correct Answer)
+4
-1
In the following circuit, the output Y for all possible inputs A and B is expressed by the truth table.

AIPMT 2007 Physics - Semiconductor Electronics Question 62 English
A
$$\matrix{ A & B & Y \cr 0 & 0 & 1 \cr 0 & 1 & 1 \cr 1 & 0 & 1 \cr 1 & 1 & 0 \cr } $$
B
$$\matrix{ A & B & Y \cr 0 & 0 & 1 \cr 0 & 1 & 0 \cr 1 & 0 & 0 \cr 1 & 1 & 0 \cr } $$
C
$$\matrix{ A & B & Y \cr 0 & 0 & 0 \cr 0 & 1 & 1 \cr 1 & 0 & 1 \cr 1 & 1 & 1 \cr } $$
D
$$\matrix{ A & B & Y \cr 0 & 0 & 0 \cr 0 & 1 & 0 \cr 1 & 0 & 0 \cr 1 & 1 & 1 \cr } $$
3
AIPMT 2007
MCQ (Single Correct Answer)
+4
-1
In the energy band diagram of a material shown below, the open circles and filled circles denote holes and electrons respectively. The material is

AIPMT 2007 Physics - Semiconductor Electronics Question 60 English
A
an insulator
B
a metal
C
an n-type semiconductor
D
a p-type semiconductor.
4
AIPMT 2007
MCQ (Single Correct Answer)
+4
-1
For a cubic crystal structure which one of the following relations indicating the cell characteristics is correct ?
A
a $$ \ne $$ b $$ \ne $$ c  and  $$\alpha $$ = $$\beta $$ = $$\gamma $$ = 90o
B
a = b = c  and  $$\alpha $$ $$ \ne $$ $$\beta $$ $$ \ne $$ $$\gamma $$ = 90o
C
a = b = c  and  $$\alpha $$ = $$\beta $$ = $$\gamma $$ = 90o
D
a $$ \ne $$ b $$ \ne $$ c  and  ;$$\alpha $$ $$ \ne $$ $$\beta $$ $$ \ne $$  and  $$\gamma $$ = 90o
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