1
AIPMT 2011 Mains
MCQ (Single Correct Answer)
+4
-1
An electron in the hydrogen atom jumps from excited state n to the ground state. The wavelength so emitted illuminates a photosensitive material having work function 2.75 eV. If the stopping potential of the photoelectron is 10 V, then the value of n is
A
2
B
3
C
4
D
5
2
AIPMT 2011 Prelims
MCQ (Single Correct Answer)
+4
-1
The wavelength of the first line of Lyman series for hydrogen atom is equal to that of the second line of Balmer series for a hydrogen like ion. The atomic number Z of hydrogen like ion is
A
3
B
4
C
1
D
2
3
AIPMT 2011 Prelims
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
The half life of a radioactive isotope X is 50 years. It decays to another element Y which is stable. The two elements X and Y were found to be in the ratio of 1 : 15 in a sample of a given rock. The age of the rock was estimated to be
A
150 years
B
200 years
C
250 years
D
100 years
4
AIPMT 2011 Prelims
MCQ (Single Correct Answer)
+4
-1
The power obtained in a reactor using U235 disintegration is 1000 kW. The mass decay of U235 per hour is
A
10 microgram
B
20 microgram
C
40 microgram
D
1 microgram
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