Properties of Solids & Liquids (NEET Physics): Questions 45 - 47 of 188
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Question number: 45
» Properties of Solids & Liquids » Surface Energy and Surface Tension
Which of the following statements are true in case when two water. drops coalesce and make a bigger drop?
(1) Energy is released.
(2) Energy is absorbed.
(3) The surface area of the bigger drop is smaller than the sum of the surface areas of both the drops.
(4) The surface area of the bigger drop is greater than the sum of the surface areas of both the drops.
select the correct answers and mark it according to the following codes:
1, 2 and 3 are correct
1 and 2 are correct
1 and 3 are correct
2 and 4 are correct
Question number: 46
» Properties of Solids & Liquids » Heat Transfer » Convection
A composite metal bar of uniform section is made up of length 15 cm of copper, 10 cm of nickel and 5 cm of aluminum. Each part being in perfect thermal contact with the adjoining part. The copper end of the composite rod is maintained at 100°C and the aluminum end at 0°C. The whole rod is covered with belt so that there is no heat loss occurs at the sides. If K Cu = 2K al and K a1 = 3K Ni, then what will be the temperatures of Cu - Ni and Ni - Al junctions respectively,
30°C and 50°C
50°C and 30°C
23.33°C and 78.8°C
83.33°C and 20°C
Question number: 47
» Properties of Solids & Liquids » Terminal Velocity
An incompressible liquid flows through a horizontal tube as shown in trite following fig. Then the velocity v of the fluid is