1
AIPMT 2009
MCQ (Single Correct Answer)
+4
-1
The ionization energy of the electron in the hydrogen atom in its ground state is 13.6 eV. The atoms are excited to higher energy levels to emit radiations of 6 wavelengths, Maximum wavelength of emitted radiation corresponds to the transition between
A
n = 3 to n = 1 states
B
n = 2 to n = 1 states
C
n = 4 to n = 3 states
D
n = 3 to n = 2 states
2
AIPMT 2009
MCQ (Single Correct Answer)
+4
-1
The symbolic representation of four logic gates are given below

AIPMT 2009 Physics - Semiconductor Electronics Question 68 English

The logic symbols for OR, NOT and NAND gates are respectively
A
(iv), (i), (iii)
B
(iv), (ii), (i)
C
(i), (iii), (iv)
D
(iii), (iv), (ii)
3
AIPMT 2009
MCQ (Single Correct Answer)
+4
-1
A p-n photodiode is fabricated from a semiconductor with a band gap of 2.5 eV. It can detect a signal of wavelength
A
4000 nm
B
6000 nm
C
4000 $$\mathop A\limits^ \circ $$
D
6000 $$\mathop A\limits^ \circ $$
4
AIPMT 2009
MCQ (Single Correct Answer)
+4
-1
Sodium has body centred packing. Distance between two nearest atoms is 3.7 $$\mathop A\limits^ \circ $$. The lattice parameter is
A
4.3 $$\mathop A\limits^ \circ $$
B
3.0 $$\mathop A\limits^ \circ $$
C
8.6 $$\mathop A\limits^ \circ $$
D
6.8 $$\mathop A\limits^ \circ $$
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