1

IIT-JEE 1985

MCQ (Single Correct Answer)
The radius of an atomic nucleus is of the order of
A
10-10 cm
B
10-13 cm
C
10-15 cm
D
10-8 cm
2

IIT-JEE 1985

MCQ (Single Correct Answer)
Bohr Model can explain
A
the spectrum of hydrogen atom only
B
spectrum of an atom or ion containing one electron only
C
the spectrum of the hydrogen molecule
D
the solar spectrum
3

IIT-JEE 1984

MCQ (Single Correct Answer)
Which electronic level would allow the hydrogen atom to absorb a photon but not to emit a photon?
A
3s
B
2p
C
2s
D
1s
4

IIT-JEE 1984

MCQ (Single Correct Answer)
Correct set of four quantum numbers for the valence (outermost) electron of rubidium (Z = 37) is
A
5, 0, 0, $$ + {1 \over 2}$$
B
5, 1, 0, $$ + {1 \over 2}$$
C
5, 1, 1, $$ + {1 \over 2}$$
D
6, 0, 0, $$ + {1 \over 2}$$

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