1
AIPMT 2012 Prelims
MCQ (Single Correct Answer)
+4
-1
Electron in hydrogen atom first jumps from third excited state to second excited state and then from second excited to the first excited state. The ratio of the wavelengths $$\lambda $$1 : $$\lambda $$2 emitted in the two cases is
A
$${7 \over 5}$$
B
$${27 \over 20}$$
C
$${27 \over 5}$$
D
$${20 \over 7}$$
2
AIPMT 2012 Prelims
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
If the nuclear radius of 27Al is 3.6 fermi, the approximate nuclear radius of 64Cu in fermi is
A
2.4
B
1.2
C
4.8
D
3.6
3
AIPMT 2012 Prelims
MCQ (Single Correct Answer)
+4
-1
Two ideal diodes are connected to a battery as shown in the circuit. The current supplied by the battery is

AIPMT 2012 Prelims Physics - Semiconductor Electronics Question 84 English
A
0.75 A
B
zero
C
0.25 A
D
0.5 A
4
AIPMT 2012 Prelims
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
In a CE transistor amplifier, the audio signal voltage across the collector resistance of 2 k$$\Omega $$ is 2 V. If the base resistance is 1 k$$\Omega $$ and the current amplification of the transistor is 100, the input signal voltage is
A
0.1 V
B
1.0 V
C
1 mV
D
10 mV
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