1
JEE Main 2020 (Online) 6th September Morning Slot
Numerical
+4
-0
Change Language
Set A has m elements and set B has n elements. If the total number of subsets of A is 112 more than the total number of subsets of B, then the value of m.n is ______.
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2
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
3
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
4
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$$\omega $$
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