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1

AIPMT 2000

MCQ (Single Correct Answer)
The life span of atomic hydrogen is
A
fraction of one second
B
one year
C
one hour
D
one day

Explanation

Atomic hydrogen is unstable and it has life period of a fraction of a second.
2

AIPMT 2000

MCQ (Single Correct Answer)
When an electron does transition from n = 4 to n = 2, then emitted line spectrum will be
A
first line of Lyman series
B
second line of Balmer series
C
first line of Balmer series
D
second line of Paschen series.

Explanation

Jump to second orbit leads to Balmer series. The jump from 4th orbit shall give rise to second line of Balmer series.
3

AIPMT 2000

MCQ (Single Correct Answer)
Nuclear fission is best explained by
A
liquid droplet theory
B
Yukawa $$\pi $$-meson theory
C
independent particle model of the nucleus
D
proton-proton cycle.

Explanation

According to liquid drop model of nucleus, an excited nucleus breaks into lighter nuclei just like an excited drop breaks into tiny drops.
4

AIPMT 2000

MCQ (Single Correct Answer)
For the given reaction, the particle X is
$$_6{C^{11}} \to {}_5{B^{11}} + {\beta ^ + } + X$$
A
neutron
B
anti neutrino
C
neutrino
D
proton

Explanation

The particle X is neutrino.

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