1
MCQ (Single Correct Answer)

AIPMT 2000

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
MCQ (Single Correct Answer)

AIPMT 2000

The relation between $$\lambda $$ and T1/2 as (T1/2 $$ \to $$ half life)
A
T1/2 = $${{\ln 2} \over \lambda }$$
B
T1/2 ln2 = $$\lambda $$
C
T1/2 = $${1 \over \lambda }$$
D
($$\lambda $$ + T1/2) = ln2

Explanation

The relation is :

T1/2 = $${{\ln 2} \over \lambda }$$
3
MCQ (Single Correct Answer)

AIPMT 2000

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.
4
MCQ (Single Correct Answer)

AIPMT 2000

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.

EXAM MAP

Joint Entrance Examination

JEE Advanced JEE Main

Medical

NEET

Graduate Aptitude Test in Engineering

GATE CE GATE ECE GATE ME GATE IN GATE EE GATE CSE GATE PI