1
AIPMT 2010 Mains
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
The decay constant of a radio isotope is $$\lambda $$. If A1 and A2 are its activities at times t1 and t2 respectively, the number of nuclei which have decayed during the time (t1 $$-$$ t2)
A
A1t1 $$-$$ A2t2
B
A1 $$-$$ A2
C
(A1 $$-$$ A2)/$$\lambda $$
D
$$\lambda ({A_1} - {A_2})$$
2
AIPMT 2010 Mains
MCQ (Single Correct Answer)
+4
-1
The binding energy per nucleon in deuterium and helium nuclei are 1.1 MeV and 7.0 MeV, respectively. When two deuterium nuclei fuse to form a helium nucleus the energy released in the fusion is
A
23.6 MeV
B
2.2 MeV
C
28.0 MeV
D
30.2 MeV
3
AIPMT 2010 Mains
MCQ (Single Correct Answer)
+4
-1
The following figure shows a logic gate circuit with two inputs A and B and the output Y. The voltage waveforms of A, B and Y are as given.

AIPMT 2010 Mains Physics - Semiconductor Electronics Question 65 English

The logic gate is
A
NOR gate
B
OR gate
C
AND gate
D
NAND gate
4
AIPMT 2010 Mains
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
For transistor action
(1)  Base, emitter and collector regions should have similar size and doping concentrations.
(2)  The base region must be vety thin and lightly doped.
(3)  The emitter-base junction is forward biased and base-collector junction is reverse biased.
(4)  Both the emitter-base junction as well as the base-collector junction are forward biased.

Which one of the following pairs of statements is correct?
A
(4) and (1)
B
(1) and (2)
C
(2) and (3)
D
(3) and (4)
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