1
JEE Main 2020 (Online) 6th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
You are given that Mass of $${}_3^7Li$$ = 7.0160u,
Mass of $${}_2^4He$$ = 4.0026u
and Mass of $${}_1^1H$$ = 1.0079u.
When 20 g of $${}_3^7Li$$ is converted into $${}_2^4He$$ by proton capture, the energy liberated, (in kWh), is :
[Mass of nucleon = 1 GeV/c2]
A
6.82 $$ \times $$ 105
B
4.5 $$ \times $$ 105
C
8 $$ \times $$ 106
D
1.33 $$ \times $$ 106
2
JEE Main 2020 (Online) 6th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
If the potential energy between two molecules is given by
U = $$ - {A \over {{r^6}}} + {B \over {{r^{12}}}}$$,
then at equilibrium, separation between molecules, and the potential energy are :
A
$${\left( {{{2B} \over A}} \right)^{1/6}}$$, $$ - {{{A^2}} \over {4B}}$$
B
$${\left( {{{2B} \over A}} \right)^{1/6}}, - {{{A^2}} \over {2B}}$$
C
$${\left( {{B \over A}} \right)^{1/6}},0$$
D
$${\left( {{B \over {2A}}} \right)^{1/6}}, - {{{A^2}} \over {2B}}$$
3
JEE Main 2020 (Online) 6th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A satellite is in an elliptical orbit around a planet P. It is observed that the velocity of the satellite when it is farthest from the planet is 6 times less than that when it is closest to the planet. The ratio of distances between the satellite and the planet at closest and farthest points is:
A
1 : 2
B
1 : 3
C
1 : 6
D
3 : 4
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 99 English
A
JEE Main 2020 (Online) 6th September Morning Slot Physics - Capacitor Question 99 English Option 1
B
JEE Main 2020 (Online) 6th September Morning Slot Physics - Capacitor Question 99 English Option 2
C
JEE Main 2020 (Online) 6th September Morning Slot Physics - Capacitor Question 99 English Option 3
D
JEE Main 2020 (Online) 6th September Morning Slot Physics - Capacitor Question 99 English Option 4
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