1
NEET 2017
MCQ (Single Correct Answer)
+4
-1
A spherical black body with a radius of 12 cm radiates 450 watt power at 500 K. If the radius were halved and the temperature doubled, the power radiated in watt would be
A
450
B
1000
C
1800
D
225
2
NEET 2017
MCQ (Single Correct Answer)
+4
-1
Two rods A and B of different materials are welded together as shown in figure. Their thermal conductivities are K1 and K2. The thermal conductivity of the composite will be

NEET 2017 Physics - Properties of Matter Question 76 English
A
$${{3\left( {{K_1} + {K_2}} \right)} \over 2}$$
B
$${K_1} + {K_2}$$
C
$$2\left( {{K_1} + {K_2}} \right)$$
D
$${{{K_1} + {K_2}} \over 2}$$
3
NEET 2016 Phase 2
MCQ (Single Correct Answer)
+4
-1
A body cools from a temperature 3T to 2T in 10 minutes. The room temperature is T. Assume that Newton's law of cooling is applicable. The temperature of the body at the end of next 10 minutes will be
A
$${7 \over 4}\,$$ T
B
$${3 \over 2}$$ T
C
$${4 \over 3}$$ T
D
T
4
NEET 2016 Phase 2
MCQ (Single Correct Answer)
+4
-1
Two identical bodies are made of a material for which the heat capacity increases with temperature. One of these is at 100oC, while the other one is at 0oC. If the two bodies are brought into contact, then, assuming no heat loss, the final common temperature is
A
50 oC
B
more than 50 oC
C
less than 50 oC but greater than 0 oC
D
0 oC
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