1
NEET 2013
+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
$${R \over {\left( {\gamma - 1} \right)}}$$
2
NEET 2013
+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
3
NEET 2013
+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
4
AIPMT 2012 Mains
+4
-1
A slab of stone of area 0.36 m2 and thickness 0.1 m is exposed on the lower surface to steam at 100oC. A block of ice at 0oC rests on the upper surface of the slab. In one hour 4.8 kg of ice is melted. The thermal conductivity of slab is
(Given latent heat of fusion of ice = 3.36 $$\times$$ 105 J kg$$-$$1)
A
1.24 J/m/s/oC
B
1.29 J/m/s/oC
C
2.05 J/m/s/oC
D
1.02 J/m/s/oC
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