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JEE Mains Previous Years Questions with Solutions

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1

JEE Main 2021 (Online) 31st August Morning Shift

MCQ (Single Correct Answer)
Two particles A and B having charges 20$$\mu$$C and $$-$$5$$\mu$$C respectively are held fixed with a separation of 5 cm. At what position a third charged particle should be placed so that it does not experience a net electric force?

A
At 5 cm from 20 $$\mu$$C on the left side of system
B
At 5 cm from $$-$$5 $$\mu$$C on the right side
C
At 1.25 cm from $$-$$5 $$\mu$$C between two charges
D
At midpoint between two charges

Explanation

Null point is possible only right side of $$-$$5 $$\mu$$C



$${E_N} = + {{k( - 5\mu C)} \over {{x^2}}} + {{k(20\mu C)} \over {{{(5 + x)}^2}}} = 0$$

x = 5 cm

$$\therefore$$ Option (b) is correct.
2

JEE Main 2021 (Online) 27th August Evening Shift

MCQ (Single Correct Answer)
For full scale deflection of total 50 divisions, 50 mV voltage is required in galvanometer. The resistance of galvanometer if its current sensitivity is 2 div/mA will be :
A
1$$\Omega$$
B
5$$\Omega$$
C
4$$\Omega$$
D
2$$\Omega$$

Explanation

$${I_{\max }} = {{50} \over 2} = 25$$ mA

$$R = {V \over I} = {{50mV} \over {25mA}} = 2\Omega $$
3

JEE Main 2021 (Online) 27th August Evening Shift

MCQ (Single Correct Answer)
The Colour coding on a carbon resistor is shown in the given figure. The resistance value of the given resistor is :

A
(5700 $$\pm$$ 285) $$\Omega$$
B
(7500 $$\pm$$ 750) $$\Omega$$
C
(5700 $$\pm$$ 375) $$\Omega$$
D
(7500 $$\pm$$ 375) $$\Omega$$

Explanation

R = 75 $$\times$$ 102 $$\pm$$ 5% of 7500

R = (7500 $$\pm$$ 375) $$\Omega$$
4

JEE Main 2021 (Online) 26th August Evening Shift

MCQ (Single Correct Answer)
If you are provided a set of resistances 2$$\Omega$$, 4$$\Omega$$, 6$$\Omega$$ and 8$$\Omega$$. Connect these resistances so as to obtain an equivalent resistance of $${{46} \over 3}$$$$\Omega$$.
A
4$$\Omega$$ and 6$$\Omega$$ are in parallel with 2$$\Omega$$ and 8$$\Omega$$ in series
B
6$$\Omega$$ and 8$$\Omega$$ are in parallel with 2$$\Omega$$ and 4$$\Omega$$ in series
C
2$$\Omega$$ and 6$$\Omega$$ are in parallel with 4$$\Omega$$ and 8$$\Omega$$ in series
D
2$$\Omega$$ and 4$$\Omega$$ are in parallel with 6$$\Omega$$ and 8$$\Omega$$ in series

Explanation

Questions Asked from Electrostatics

On those following papers in MCQ (Single Correct Answer)
Number in Brackets after Paper Indicates No. of Questions
JEE Main 2021 (Online) 31st August Morning Shift (1)
JEE Main 2021 (Online) 27th August Evening Shift (2)
JEE Main 2021 (Online) 26th August Evening Shift (1)
JEE Main 2021 (Online) 26th August Morning Shift (1)
JEE Main 2021 (Online) 27th July Evening Shift (2)
JEE Main 2021 (Online) 27th July Morning Shift (1)
JEE Main 2021 (Online) 25th July Evening Shift (1)
JEE Main 2021 (Online) 22th July Evening Shift (2)
JEE Main 2021 (Online) 20th July Morning Shift (2)
JEE Main 2021 (Online) 18th March Morning Shift (1)
JEE Main 2021 (Online) 17th March Morning Shift (1)
JEE Main 2021 (Online) 16th March Evening Shift (1)
JEE Main 2021 (Online) 16th March Morning Shift (1)
JEE Main 2021 (Online) 24th February Evening Shift (1)
JEE Main 2021 (Online) 24th February Morning Shift (1)
JEE Main 2020 (Online) 6th September Morning Slot (1)
JEE Main 2020 (Online) 5th September Evening Slot (1)
JEE Main 2020 (Online) 4th September Morning Slot (2)
JEE Main 2020 (Online) 3rd September Morning Slot (1)
JEE Main 2020 (Online) 9th January Morning Slot (2)
JEE Main 2020 (Online) 8th January Evening Slot (1)
JEE Main 2020 (Online) 8th January Morning Slot (3)
JEE Main 2020 (Online) 7th January Morning Slot (2)
JEE Main 2019 (Online) 12th April Evening Slot (1)
JEE Main 2019 (Online) 12th April Morning Slot (1)
JEE Main 2019 (Online) 10th April Evening Slot (2)
JEE Main 2019 (Online) 10th April Morning Slot (4)
JEE Main 2019 (Online) 9th April Evening Slot (2)
JEE Main 2019 (Online) 9th April Morning Slot (3)
JEE Main 2019 (Online) 8th April Evening Slot (3)
JEE Main 2019 (Online) 8th April Morning Slot (1)
JEE Main 2019 (Online) 12th January Evening Slot (1)
JEE Main 2019 (Online) 12th January Morning Slot (2)
JEE Main 2019 (Online) 11th January Evening Slot (1)
JEE Main 2019 (Online) 11th January Morning Slot (2)
JEE Main 2019 (Online) 10th January Evening Slot (2)
JEE Main 2019 (Online) 10th January Morning Slot (1)
JEE Main 2019 (Online) 9th January Evening Slot (3)
JEE Main 2019 (Online) 9th January Morning Slot (2)
JEE Main 2018 (Online) 16th April Morning Slot (2)
JEE Main 2018 (Offline) (2)
JEE Main 2018 (Online) 15th April Evening Slot (3)
JEE Main 2018 (Online) 15th April Morning Slot (3)
JEE Main 2017 (Online) 9th April Morning Slot (2)
JEE Main 2017 (Online) 8th April Morning Slot (2)
JEE Main 2017 (Offline) (2)
JEE Main 2016 (Online) 10th April Morning Slot (2)
JEE Main 2016 (Online) 9th April Morning Slot (2)
JEE Main 2016 (Offline) (2)
JEE Main 2015 (Offline) (2)
JEE Main 2014 (Offline) (2)
JEE Main 2013 (Offline) (3)
AIEEE 2012 (3)
AIEEE 2011 (2)
AIEEE 2010 (2)
AIEEE 2009 (4)
AIEEE 2008 (2)
AIEEE 2007 (4)
AIEEE 2006 (3)
AIEEE 2005 (5)
AIEEE 2004 (4)
AIEEE 2003 (6)
AIEEE 2002 (5)

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