1
JEE Main 2020 (Online) 4th September Evening Slot
+4
-1
Identify the operation performed by the circuit given below :
A
AND
B
NAND
C
OR
D
NOT
2
JEE Main 2020 (Online) 4th September Morning Slot
+4
-1
Take the breakdown voltage of the
zener diode used in the given circuit as 6V.
For the input voltage shown in figure below,
the time variation of the output voltage is:
(Graphs drawn are schematic and not to scale)
A
B
C
D
3
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
4
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.
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Physics
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Modern Physics
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