1
JEE Main 2020 (Online) 3rd September Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
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.
2
JEE Main 2020 (Online) 3rd September Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
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
3
JEE Main 2020 (Online) 3rd September Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A particle is moving unidirectionally on a horizontal plane under the action of a constant power supplying energy source. The displacement (s) - time (t) graph that describes the motion of the particle is (graphs are drawn schematically and are not to scale) :
A
JEE Main 2020 (Online) 3rd September Evening Slot Physics - Work Power & Energy Question 94 English Option 1
B
JEE Main 2020 (Online) 3rd September Evening Slot Physics - Work Power & Energy Question 94 English Option 2
C
JEE Main 2020 (Online) 3rd September Evening Slot Physics - Work Power & Energy Question 94 English Option 3
D
JEE Main 2020 (Online) 3rd September Evening Slot Physics - Work Power & Energy Question 94 English Option 4
4
JEE Main 2020 (Online) 3rd September Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Two sources of light emit X-rays of wavelength 1 nm and visible light of wavelength 500 nm, respectively. Both the sources emit light of the same power 200 W. The ratio of the number density of photons of X-rays to the number density of photons of the visible light of the given wavelengths is :
A
$${1 \over {500}}$$
B
500
C
250
D
$${1 \over {250}}$$
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