1
NEET 2013 (Karnataka)
+4
-1
Two metal rods 1 and 2 of same lengths have same temperature difference between their ends. Their thermal conductivities are K1 and K2 and cross sectional areas A1 and A2, respectively. If the rate of heat conduction in 1 is four times that in 2, then
A
K1A1 = 4K2A2
B
K1A1 = 2K2A2
C
4K1A1 = K2A2
D
K1A1 = K2A2
2
NEET 2013 (Karnataka)
+4
-1
A fluid is in streamline flow across a horizontal pipe of variable area of cross section. For this which of the following statements is correct?
A
The velocity is maximum at the narrowest part of the pipe and pressure is maximum at the widest part of the pipe.
B
Velocity and pressure both are maximum at the narrowest part of the pipe.
C
velocity and pressure both are maximum at the widest part of the pipe.
D
The velocity is minimum at the narrowest part of the pipe and the pressure is minimum at the widest part of the pipe.
3
NEET 2013 (Karnataka)
+4
-1
The density of water at 20oC is 998 kg/m3 and at 40oC is 992 kg/m3. The coefficient of volume expansion of water is
A
3 $$\times$$ 10$$-$$4/oC
B
2 $$\times$$ 10$$-$$4/oC
C
6 $$\times$$ 10$$-$$4/oC
D
10 $$\times$$ 10$$-$$4/oC
4
NEET 2013
+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
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