1
AIEEE 2008
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
A working transistor with its three legs marked $$P,Q$$ and $$R$$ is tested using a multi-meter. No conduction is found between $$P$$ and $$Q$$. By connecting the common (negative) terminal of the multi-meter to $$R$$ and the other (positive) terminal to $$P$$ or $$Q,$$ some resistance is seen on the multi-meter. Which of the following is true for the transistor?
A
It is an $$npn$$ transistor with $$R$$ as base
B
It is an $$pnp$$ transistor with $$R$$ as collector
C
It is an $$pnp$$ transistor with $$R$$ as emitter
D
It is an $$npn$$ transistor with $$R$$ as collector
2
AIEEE 2008
MCQ (Single Correct Answer)
+4
-1
In the circuit below, $$A$$ and $$B$$ represent two inputs and $$C$$ represents the output. AIEEE 2008 Physics - Semiconductor Question 178 English

The circuit represents

A
NOR gate
B
AND gate
C
NAND gate
D
OR gate
3
AIEEE 2007
MCQ (Single Correct Answer)
+4
-1
Carbon, silicon and germanium have four valence electrons each. At room temperature which one of the following statements is most appropriate ?
A
The number of free electrons for conduction is significant only in $$Si$$ and $$Ge$$ but small in $$C.$$
B
The number of free conduction electrons is significant in $$C$$ but small in $$Si$$ and $$Ge.$$
C
The number of free conduction electrons is negligibly small in all the three.
D
The number of free electrons for conduction is significant in all the three
4
AIEEE 2007
MCQ (Single Correct Answer)
+4
-1
If in a $$p$$-$$n$$ junction diode, a square input signal of $$10$$ $$V$$ is applied as shown AIEEE 2007 Physics - Semiconductor Question 179 English

Then the output signal across $${R_L}$$ will be

A
AIEEE 2007 Physics - Semiconductor Question 179 English Option 1
B
AIEEE 2007 Physics - Semiconductor Question 179 English Option 2
C
AIEEE 2007 Physics - Semiconductor Question 179 English Option 3
D
AIEEE 2007 Physics - Semiconductor Question 179 English Option 4
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