1
AIPMT 2014
MCQ (Single Correct Answer)
+4
-1
Certain quantity of water cools from 70oC to 60oC in the first 5 minutes and to 54oC in the next 5 minutes. The temperature of the surroundings is
A
45oC
B
20oC
C
42oC
D
10oC
2
NEET 2013 (Karnataka)
MCQ (Single Correct Answer)
+4
-1
If the ratio of diameters, lengths and Young's modulus of steel and copper wires shown in the figure are p, q and s respectively, then the corresponding ratio of increase in their lengths would be

A
$$\left( {{{5q} \over {7s{p^2}}}} \right)$$
B
$$\left( {{{7q} \over {5s{p^2}}}} \right)$$
C
$$\left( {{{2q} \over {5sp}}} \right)$$
D
$$\left( {{{7q} \over {5sp}}} \right)$$
3
NEET 2013 (Karnataka)
MCQ (Single Correct Answer)
+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
4
NEET 2013 (Karnataka)
MCQ (Single Correct Answer)
+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.
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