1

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 ____

2

JEE Main 2021 (Online) 25th February Evening Shift

Numerical

+4

-1

Electromagnetic radiation of wavelength 663 nm is just sufficient to ionise the atom of metal A. The ionization enegy of metal A in kJ mol

[h = 6.63 $$\times$$ 10

^{$$-$$1}is __________. (Rounded off to the nearest integer)[h = 6.63 $$\times$$ 10

^{$$-$$34}Js, c = 3.00 $$\times$$ 10^{8}ms^{$$-$$1}, N_{A}= 6.02 $$\times$$ 10^{23}mol^{$$-$$1}]Your input ____

3

JEE Main 2021 (Online) 25th February Evening Shift

Numerical

+4

-1

Among the following, number of metal/s which can be used as electrodes in the photoelectric cell is _________. (Integer answer)

(A) Li

(B) Na

(C) Rb

(D) Cs

(A) Li

(B) Na

(C) Rb

(D) Cs

Your input ____

4

JEE Main 2021 (Online) 24th February Morning Shift

Numerical

+4

-1

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

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