1
JEE Main 2021 (Online) 26th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Given below are two statements.

Statement I : According to Bohr's model of an atom, qualitatively the magnitude of velocity of electron increases with decrease in positive charges on the nucleus as there is no strong hold on the electron by the nucleus.

Statement II : According to Bohr's model of an atom, qualitatively the magnitude of velocity of electron increases with decrease in principal quantum number.

In the light of the above statements, choose the most appropriate answer from the options given below :
A
Both Statement I and Statement II are false
B
Both Statement I and Statement II are true
C
Statement I is false but Statement II is true
D
Statement I is true but Statement II is false
2
JEE Main 2021 (Online) 27th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
If the Thompson model of the atom was correct, then the result of Rutherford's gold foil experiment would have been :
A
All of the $$\alpha$$-particles pass through the gold foil without decrease in speed.
B
$$\alpha$$-particles are deflected over a wide range of angles.
C
All $$\alpha$$-particles get bounced back by 180$$^\circ$$
D
$$\alpha$$-particles pass through the gold foil deflected by small angles and with reduced speed.
3
JEE Main 2021 (Online) 27th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Given below are two statements :

Statement I : Rutherford's gold foil experiment cannot explain the line spectrum of hydrogen atom.

Statement II : Bohr's model of hydrogen atom contradicts Heisenberg' uncertainty principle.

In the light of the above statements, choose the most appropriate answer from the options given below :
A
Statement I is false but statement II is true.
B
Statement I is true but statement II is false.
C
Both statement I and statement II are false.
D
Both statement I and statement II are true.
4
JEE Main 2021 (Online) 20th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Outermost electronic configuration of a group 13 element, E, is 4s2, 4p1. The electronic configuration of an element of p-block period-five placed diagonally to element, E is :
A
[Kr] 3d10 4s2 4p2
B
[Ar] 3d10 4s2 4p2
C
[Xe] 5d10 6s2 6p2
D
[Kr] 4d10 5s2 5p2
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