1
JEE Main 2020 (Online) 6th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
In the figure shown, the current in the 10 V battery is close to : JEE Main 2020 (Online) 6th September Evening Slot Physics - Current Electricity Question 174 English
A
0.36 A from negative to positive terminal
B
0.42 A from positive to negative terminal
C
0.71 A from positive to negative terminal
D
0.21 A from positive to negative terminal
2
JEE Main 2020 (Online) 6th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
Consider the force F on a charge 'q' due to a uniformly charged spherical shell of radius R carrying charge Q distributed uniformly over it. Which one of the following statements is true for F, if 'q' is placed at distance r from the centre of the shell?
A
$${1 \over {4\pi {\varepsilon _0}}}{{qQ} \over {{R^2}}} > F > 0$$ for r < R
B
$$F = {1 \over {4\pi {\varepsilon _0}}}{{qQ} \over {{r^2}}}$$ for r > R
C
$$F = {1 \over {4\pi {\varepsilon _0}}}{{qQ} \over {{r^2}}}$$ for all r
D
$$F = {1 \over {4\pi {\varepsilon _0}}}{{qQ} \over {{R^2}}}$$ for r < R
3
JEE Main 2020 (Online) 6th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
Two planets have masses M and 16 M and their radii are $$a$$ and 2$$a$$, respectively. The separation between the centres of the planets is 10$$a$$. A body of mass m is fired from the surface of the larger planet towards the smaller planet along the line joining their centres. For the body to be able to reach at the surface of smaller planet, the minimum firing speed needed is :
A
$$2\sqrt {{{GM} \over a}} $$
B
$$\sqrt {{{G{M^2}} \over {ma}}} $$
C
$${3 \over 2}\sqrt {{{5GM} \over a}} $$
D
$$4\sqrt {{{GM} \over a}} $$
4
JEE Main 2020 (Online) 6th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
Given the masses of various atomic particles
mp = 1.0072 u, mn = 1.0087 u, me = 0.000548 u,
$${m_{\overline v }}$$ = 0, md = 2.0141 u, where p $$ \equiv $$ proton, n $$ \equiv $$ neutron,
e $$ \equiv $$ electron, $$\overline v $$ $$ \equiv $$ antineutrino and d $$ \equiv $$ deuteron. Which of the following process is allowed by momentum and energy conservation?
A
n + n $$ \to $$ deuterium atom
(electron bound to the nucleus)
B
n + p $$ \to $$ d + $$\gamma $$
C
p $$ \to $$ n + e+ + $$\overline v $$
D
e+ + e- $$ \to $$ $$\gamma $$
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