1
IIT-JEE 2002 Screening
MCQ (Single Correct Answer)
+2
-0.5
If the nitrogen atom has electronic configuration 1s7, it would have energy lower than that of the normal ground state configuration 1s22s22p3, because the electrons would be closer to the nucleus. Yet 1s7 is not observed because it violates
A
Heisenberg uncertainty principle
B
Hund's rule
C
Pauli exclusion principle
D
Bohr postulate of stationary orbits
2
IIT-JEE 2001 Screening
MCQ (Single Correct Answer)
+1
-0.25
The wavelength associated with a golf ball weighing 200 g and moving at speed of 5 m/h is of the order
A
10-10 m
B
10-20 m
C
10-30 m
D
10-40 m
3
IIT-JEE 2001 Screening
MCQ (Single Correct Answer)
+1
-0.25
The quantum numbers +1/2 and -1/2 for the electron spin represent
A
rotation of the electron in clockwise and anticlockwise direction respectively
B
rotation of the electron in anticlockwise and clockwise direction respectively
C
magnetic moment of the electron pointing up and down respectively
D
two quantum mechanical spin states which have no classical analogue
4
IIT-JEE 2000 Screening
MCQ (Single Correct Answer)
+1
-0.25
The electronic configuration of an element is 1s2, 2s2 2p6, 3s2 3p6 3d5, 4s1 This represents its
A
excited state
B
ground state
C
cationic form
D
anionic form
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