1
JEE Main 2021 (Online) 20th July Evening Shift
Numerical
+4
-1
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A body of mass 'm' is launched up on a rough inclined plane making an angle of 30$$^\circ$$ with the horizontal. The coefficient of friction between the body and plane is $${{\sqrt x } \over 5}$$ if the time of ascent is half of the time of descent. The value of x is __________.
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2
JEE Main 2021 (Online) 20th July Evening Shift
Numerical
+4
-1
Change Language
In the given figure switches S1 and S2 are in open condition. The resistance across ab when the switches S1 and S2 are closed is _____________ $$\Omega$$.

JEE Main 2021 (Online) 20th July Evening Shift Physics - Current Electricity Question 151 English
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3
JEE Main 2021 (Online) 20th July Evening Shift
Numerical
+4
-1
Change Language
Two bodies, a ring and a solid cylinder of same material are rolling down without slipping an inclined plane. The radii of the bodies are same. The ratio of velocity of the centre of mass at the bottom of the inclined plane of the ring to that of the cylinder is $${{\sqrt x } \over 2}$$. Then, the value of x is _____________.
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4
JEE Main 2021 (Online) 20th July Evening Shift
Numerical
+4
-1
Change Language
For the forward biased diode characteristics shown in the figure, the dynamic resistance at ID = 3 mA will be __________ $$\Omega$$.

JEE Main 2021 (Online) 20th July Evening Shift Physics - Semiconductor Question 86 English
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