1

JEE Main 2021 (Online) 16th March Evening Shift

Numerical

+4

-1

The number of orbitals with n = 5, m

_{1}= +2 is ___________. (Round off to the Nearest Integer).Your input ____

2

JEE Main 2021 (Online) 16th March Morning Shift

Numerical

+4

-1

When light of wavelength 248 nm falls on a metal of threshold energy 3.0 eV, the de-Broglie wavelength of emitted electrons is _______$$\mathop A\limits^o $$. (Round off to the Nearest Integer).

[ Use : $$\sqrt 3 $$ = 1.73, h = 6.63 $$\times$$ 10

m

[ Use : $$\sqrt 3 $$ = 1.73, h = 6.63 $$\times$$ 10

^{$$-$$34}Jsm

_{e}= 9.1 $$\times$$ 10^{$$-$$31}kg; c = 3.0 $$\times$$ 10^{8}ms^{$$-$$1}; 1eV = 1.6 $$\times$$ 10^{$$-$$19}J]Your input ____

3

JEE Main 2021 (Online) 26th February Evening Shift

Numerical

+4

-1

A ball weighing 10 g is moving with a velocity of 90 ms

[Given : h = 6.63 $$\times$$ 10

^{$$-$$1}. If the uncertainty in its velocity is 5%, then the uncertainty in its position is ___________ $$\times$$ 10^{$$-$$33}m. (Rounded off to the nearest integer)[Given : h = 6.63 $$\times$$ 10

^{$$-$$34}Js]Your input ____

4

JEE Main 2021 (Online) 24th February Morning Slot

Numerical

+4

-1

English

Hindi

A proton and a Li

The value of x is ______. (Rounded off to the nearest integer)

[Mass of Li

^{3+}nucleus are accelerated by the same potential. If $$\lambda _{Li}$$ and $$\lambda _p$$ denote the de Broglie wavelengths of Li^{3+}and proton respectively, then the value of $${{{\lambda _{Li}}} \over {{\lambda _p}}}$$ is x $$ \times $$ 10^{-1}.The value of x is ______. (Rounded off to the nearest integer)

[Mass of Li

^{3+}= 8.3 mass of proton]Your input ____

Questions Asked from Structure of Atom (Numerical)

Number in Brackets after Paper Indicates No. of Questions

JEE Main 2023 (Online) 1st February Morning Shift (1) JEE Main 2023 (Online) 30th January Morning Shift (1) JEE Main 2023 (Online) 29th January Evening Shift (1) JEE Main 2023 (Online) 25th January Evening Shift (1) JEE Main 2022 (Online) 29th July Morning Shift (1) JEE Main 2022 (Online) 28th July Evening Shift (1) JEE Main 2022 (Online) 26th July Evening Shift (1) JEE Main 2022 (Online) 26th July Morning Shift (1) JEE Main 2022 (Online) 25th July Evening Shift (1) JEE Main 2022 (Online) 28th June Morning Shift (1) JEE Main 2022 (Online) 27th June Evening Shift (1) JEE Main 2022 (Online) 27th June Morning Shift (1) JEE Main 2022 (Online) 25th June Morning Shift (1) JEE Main 2021 (Online) 1st September Evening Shift (1) JEE Main 2021 (Online) 31st August Evening Shift (1) JEE Main 2021 (Online) 31st August Morning Shift (1) JEE Main 2021 (Online) 27th August Evening Shift (1) JEE Main 2021 (Online) 27th August Morning Shift (1) JEE Main 2021 (Online) 26th August Evening Shift (1) JEE Main 2021 (Online) 25th July Evening Shift (1) JEE Main 2021 (Online) 25th July Morning Shift (1) JEE Main 2021 (Online) 22th July Evening Shift (1) JEE Main 2021 (Online) 20th July Evening Shift (1) JEE Main 2021 (Online) 20th July Morning Shift (1) JEE Main 2021 (Online) 17th March Evening 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) 26th February Evening Shift (1) JEE Main 2021 (Online) 24th February Morning Shift (1) JEE Main 2020 (Online) 2nd September Evening Slot (1)