1
JEE Main 2020 (Online) 6th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
An electron, a doubly ionized helium ion (He++) and a proton are having the same kinetic energy. The relation between their respective de-Broglie wavelengths $$\lambda $$e, $$\lambda $$He++ and $$\lambda $$p is :
A
$$\lambda $$e > $$\lambda $$He++ > $$\lambda $$p
B
$$\lambda $$e < $$\lambda $$p < $$\lambda $$He++
C
$$\lambda $$e > $$\lambda $$p > $$\lambda $$He++
D
$$\lambda $$e < $$\lambda $$He++ = $$\lambda $$p
2
JEE Main 2020 (Online) 6th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A screw gauge has 50 divisions on its circular scale. The circular scale is 4 units ahead of the pitch scale marking, prior to use. Upon one complete rotation of the circular scale, a displacement of 0.5mm is noticed on the pitch scale. The nature of zero error involved and the least count of the screw gauge, are respectively :
A
Positive, 0.1 mm
B
Positive, 0.1 $$\mu $$m
C
Positive, 10 $$\mu $$m
D
Negative, 2 $$\mu $$m
3
JEE Main 2020 (Online) 6th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Four point masses, each of mass m, are fixed at the corners of a square of side $$l$$. The square is rotating with angular frequency $$\omega $$, about an axis passing through one of the corners of the square and parallel to its diagonal, as shown in the figure. The angular momentum of the square about this axis is : JEE Main 2020 (Online) 6th September Morning Slot Physics - Rotational Motion Question 98 English
A
3m$$l$$2$$\omega $$
B
4m$$l$$2$$\omega $$
C
m$$l$$2$$\omega $$
D
2m$$l$$2$$\omega $$
4
JEE Main 2020 (Online) 6th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
For the given input voltage waveform Vin(t), the output voltage waveform V0(t), across the capacitor is correctly depicted by : JEE Main 2020 (Online) 6th September Morning Slot Physics - Capacitor Question 77 English
A
JEE Main 2020 (Online) 6th September Morning Slot Physics - Capacitor Question 77 English Option 1
B
JEE Main 2020 (Online) 6th September Morning Slot Physics - Capacitor Question 77 English Option 2
C
JEE Main 2020 (Online) 6th September Morning Slot Physics - Capacitor Question 77 English Option 3
D
JEE Main 2020 (Online) 6th September Morning Slot Physics - Capacitor Question 77 English Option 4
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