1
AIPMT 2004
MCQ (Single Correct Answer)
+4
-1
If $$\lambda $$m denotes the wavelength at which the radioactive amission from a black body at a temperature TK is maximum, then
A
$${\lambda _m}\, \propto \,{T^4}$$
B
$${\lambda _m}$$ is independent of T
C
$${\lambda _m}$$ $$ \propto $$ T
D
$${\lambda _m}\, \propto \,{T^{ - 1}}$$
2
AIPMT 2003
MCQ (Single Correct Answer)
+4
-1
Consider a compound slab consisting of two different materials having equal thicknesses and thermal conductivities K and 2K, respectively. The equivalent thermal conductivity of the slab is
A
$${2 \over 3}K$$
B
$$\sqrt 2 K$$
C
3 K
D
$${4 \over 3}K$$
3
AIPMT 2002
MCQ (Single Correct Answer)
+4
-1
Unit of Stefan's constant is
A
watt m2 K4
B
watt m2/K4
C
watt/m2 K
D
watt/m2K4
4
AIPMT 2002
MCQ (Single Correct Answer)
+4
-1
Consider two rods of same length and different specific heats (S1, S2), conductivities (K1, K2) and area of cross-sections (A1, A2) and both having temperatures T1 and T2 at their ends. If rate of loss of heat due to conduction is equal, then
A
K1A1 = K2A2
B
$${{{K_1}{A_1}} \over {{S_1}}} = {{{K_2}{A_2}} \over {{S_2}}}$$
C
K2A1 = K1A2
D
$${{{K_2}{A_1}} \over {{S_2}}} = {{{K_1}{A_2}} \over {{S_1}}}$$
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