1
JEE Main 2020 (Online) 3rd September Evening Slot
+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
+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
+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
+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)
A
1, 1, 0, 1
B
0, 1, 0, 0
C
1, 0, 1, 1
D
0, 0, 1, 0
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