1
AIPMT 2011 Mains
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Two radioactive nuclei P and Q, in a given sample decay into a stable nucleus R. At time t = 0. number of P species are 4 N0 and that of Q are N0. Half -life of P (for conversion to R) is 1 minute where as that of Q is 2 minutes. Initially there are no nuclei of R present in the sample. When number of nuclei of P and Q are equal, the number of nuclei of R present in the sample would be
A
2 N0
B
3 N0
C
$${{9{N_0}} \over 2}$$
D
$${{5{N_0}} \over 2}$$
2
AIPMT 2011 Mains
MCQ (Single Correct Answer)
+4
-1
Out of the following which one is not a possible energy for a photon to be emitted by hydrogen atom according to Bohr's atomic model?
A
0.65 eV
B
1.9 eV
C
11.1 eV
D
13.6 eV
3
AIPMT 2011 Mains
MCQ (Single Correct Answer)
+4
-1
A Zener diode, having breakdown voltage equal to 15 V, is used in a voltage regulator circuit shown in figure. The current through the diode is

AIPMT 2011 Mains Physics - Semiconductor Electronics Question 72 English
A
5 mA
B
10 mA
C
15 mA
D
20 mA
4
AIPMT 2011 Mains
MCQ (Single Correct Answer)
+4
-1
In the following figure, the diodes which are forward biased, are

AIPMT 2011 Mains Physics - Semiconductor Electronics Question 71 English
A
(A), (B) and (D)
B
(C) only
C
(C) and (A)
D
(B) and (D)
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