1
JEE Main 2020 (Online) 3rd September Evening Slot
MCQ (Single Correct Answer)
+4
-1
If a semiconductor photodiode can detect a photon with a maximum wavelength of 400 nm, then its band gap energy is :

Planck’s constant h = 6.63 $$ \times $$ 10–34 J.s. Speed of light c = 3 $$ \times $$ 108 m/s
A
1.5 eV
B
2.0 eV
C
3.1 eV
D
1.1 eV
2
JEE Main 2020 (Online) 3rd September Evening Slot
MCQ (Single Correct Answer)
+4
-1
Which of the following will NOT be observed when a multimeter (operating in resistance measuring mode) probes connected across a component, are just reversed?
A
Multimeter shows NO deflection in both cases i.e. before and after reversing the probes if the chosen component is metal wire.
B
Multimeter shows a deflection, accompanied by a splash of light out of connected component in one direction and NO deflection on reversing the probes if the chosen component is LED.
C
Multimeter shows an equal deflection in both cases i.e. before and after reversing the probes if the chosen component is resistor.
D
Multimeter shows NO deflection in both cases i.e. before and after reversing the probes if the chosen component is capacitor.
3
JEE Main 2020 (Online) 3rd September Morning Slot
MCQ (Single Correct Answer)
+4
-1
When a diode is forward biased, it has a voltage drop of 0.5 V. The safe limit of current through the diode is 10 mA. If a battery of emf 1.5 V is used in the circuit, the value of minimum resistance to be connected in series with the diode so that the current does not exceed the safe limit is
A
50 $$\Omega $$
B
200 $$\Omega $$
C
300 $$\Omega $$
D
100 $$\Omega $$
4
JEE Main 2020 (Online) 2nd September Evening Slot
MCQ (Single Correct Answer)
+4
-1
In the following digital circuit, what will be the output at ‘Z’, when the
input (A, B) are (1, 0), (0, 0), (1, 1,), (0, 1) JEE Main 2020 (Online) 2nd September Evening Slot Physics - Semiconductor Question 117 English
A
1, 1, 0, 1
B
0, 1, 0, 0
C
1, 0, 1, 1
D
0, 0, 1, 0
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