1
WB JEE 2020
MCQ (Single Correct Answer)
+1
-0.25
Change Language
A common emitter transistor amplifier is connected with a load resistance of 6 k$$\Omega $$ . When a small AC signal of 15 mV is added to the base-emitter voltage, the alternating base current is 20$$\mu $$A and the alternating collector current is 1.8 mA. What is the voltage gain of the amplifier?
A
90
B
640
C
900
D
720
2
WB JEE 2020
MCQ (Single Correct Answer)
+1
-0.25
Change Language
WB JEE 2020 Physics - Electronic Devices Question 18 English
In the circuit shown, the value of $$\beta $$ of the transistor is 48. If the supplied base current is 200 $$\mu $$A, what is the voltage at the terminal Y?
A
0.2 V
B
0.5 V
C
4 V
D
4.8 V
3
WB JEE 2020
MCQ (Single Correct Answer)
+1
-0.25
Change Language
The frequency v of the radiation emitted by an atom when an electron jumps from one orbit to another is given by v = k$$\delta $$E, where k is a constant and $$\delta $$E is the change in energy level due to the transition. Then, dimension of k is
A
$${\left[ {M{L^2}{T^{ - 2}}} \right]}$$
B
the same dimension of angular momentum
C
$${\left[ {M{L^2}{T^{ - 1}}} \right]}$$
D
$$\left[ {{M^{ - 1}}{L^{ - 2}}T} \right]$$
4
WB JEE 2020
MCQ (Single Correct Answer)
+1
-0.25
Change Language
Consider the vectors $$A = \hat i + \hat j - \hat k$$ ,$$B = 2\hat i - \hat j + \hat k$$ and $$C = {1 \over {\sqrt 5 }}\left( {\hat i - 2\hat j + 2\hat k} \right)$$ . What is the value of C. (A$$ \times $$ B) ?
A
1
B
0
C
3$${\sqrt 2 }$$
D
18$${\sqrt 5 }$$
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