1
JEE Main 2021 (Online) 26th August Morning Shift
+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
+4
-1
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
+4
-1
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) 25th July Evening Shift
+4
-1
The spin only magnetic moments (in BM) for free Ti3+, V2+ and Sc3+ ions respectively are

(At.No. Sc : 21, Ti : 22, V : 23)
A
3.87, 1.73, 0
B
1.73, 3.87, 0
C
1.73, 0, 3.87
D
0, 3.87, 1.73
JEE Main Subjects
Physics
Mechanics
Electricity
Optics
Modern Physics
Chemistry
Physical Chemistry
Inorganic Chemistry
Organic Chemistry
Mathematics
Algebra
Trigonometry
Coordinate Geometry
Calculus
EXAM MAP
Joint Entrance Examination