1
AIPMT 2006
MCQ (Single Correct Answer)
+4
-1
A black body at 1227oC emits radiations with maximum intensity at a wavelength of 5000 $$\mathop A\limits^ \circ$$. If the temperature of the body is increased by 1000oC, the maximum intensity will be observed at
A
3000 $$\mathop A\limits^ \circ$$
B
4000$$\mathop A\limits^ \circ$$
C
5000$$\mathop A\limits^ \circ$$
D
6000$$\mathop A\limits^ \circ$$
2
AIPMT 2005
MCQ (Single Correct Answer)
+4
-1
Which of the following rods, (given radius r and length $$l$$) each made of the same material and whose ends are maintained at the same temperature will conduct most heat ?
A
r = r0, $$l$$ = $$l$$0
B
r = 2r0, $$l$$ = $$l$$0
C
r = r0, $$l$$ = 2$$l$$0
D
r = 2r0, $$l$$ = 2$$l$$0
3
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
$${\lambda _m}\, \propto \,{T^{ - 1}}$$
4
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
$${4 \over 3}K$$
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