1
AIPMT 2007
+4
-1
Which one of the following represents forward bias diode ?
A
B
C
D
2
AIPMT 2007
+4
-1
In the following circuit, the output Y for all possible inputs A and B is expressed by the truth table.

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
+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

A
an insulator
B
a metal
C
an n-type semiconductor
D
a p-type semiconductor.
4
AIPMT 2007
+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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