1
AIPMT 2014
MCQ (Single Correct Answer)
+4
-1
Change Language
The barrier potential of a p-n junction depends on
(1)   type of semiconductor material
(2)   amount of doping

(3)   temperature

Which one of the following is correct ?
A
(1) and (2) only
B
(2) only
C
(2) and (3) only
D
(1), (2) and (3)
2
AIPMT 2014
MCQ (Single Correct Answer)
+4
-1
Change Language
Copper of fixed volume V is drawn into wire of length $$l$$. When this wire is subjected to a constant force F, the extension produced in the wire is $$\Delta $$$$l$$. Which of the following graphs is a straight line ?
A
$$\Delta $$$$l$$ versus 1/$$l$$
B
$$\Delta $$$$l$$ versus $$l$$2
C
$$\Delta $$$$l$$ versus 1/$$l$$2
D
$$\Delta $$$$l$$ versus $$l$$
3
AIPMT 2014
MCQ (Single Correct Answer)
+4
-1
Change Language
A certain number of spherical drops of a liquid of radius r coalesce to form a single drop of radius R and volume V. If T is the surface tension of the liquid, then
A
energy = 4VT $$\left( {{1 \over r} - {1 \over R}} \right)$$ is released.
B
energy = 3VT$$\left( {{1 \over r} + {1 \over R}} \right)$$ is absorbed.
C
energy = 3VT$$\left( {{1 \over r} - {1 \over R}} \right)$$ is released
D
energy is neither released nor absorbed.
4
AIPMT 2014
MCQ (Single Correct Answer)
+4
-1
Change Language
Steam at 100oC is passed into 20 g of water at 10oC. When water acquires a temperature of 80oC, the mass of water present will be
[Take specific heat of water = 1 cal g$$-$$1 oC$$-$$1 and latent heat of steam = 540 cal g$$-$$1]
A
24 g
B
31.5 g
C
42.5 g
D
22.5 g