1
NEET 2013
MCQ (Single Correct Answer)
+4
-1
A piece of iron is heated in a flame. It first becomes dull red then becomes reddish yellow and finally turns to white hot. The correct explanation for the above observation is possible by using
A
Kirchhoff's Law
B
Newton's Law of cooling
C
Stefan's Law
D
Wien's displacement Law
2
NEET 2013
MCQ (Single Correct Answer)
+4
-1
The molar specific heats of an ideal gas at constant pressure and volume are denoted by Cp and Cv, respectively. If  $$\gamma $$ = $${{{C_p}} \over {{C_v}}}$$ and R is the universal gas constant, then Cv is equal to
A
$${{\left( {\gamma - 1} \right)} \over R}$$
B
$$\gamma R$$
C
$${{1 + \gamma } \over {1 - \gamma }}$$
D
$${R \over {\left( {\gamma - 1} \right)}}$$
3
NEET 2013
MCQ (Single Correct Answer)
+4
-1
The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied?
A
length = 200 cm, diameter = 2 mm
B
length = 300 cm, diameter = 3 mm
C
length = 50 cm, diameter = 0.5 mm
D
length = 100 cm, diameter = 1 mm
4
NEET 2013
MCQ (Single Correct Answer)
+4
-1
The wettability of a surface by a liquid depends primarily on
A
density
B
angle of contact between the surface and the liquid
C
viscosity
D
surface tension
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