Properties of Solids & Liquids [NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 46 - 48 of 453
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Question 46
Question MCQ▾
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 KCu = 2Kal and Ka1 = 3KNi, then what will be the temperatures of Cu - Ni and Ni - Al junctions respectively,
Choices
Choice (4) | Response | |
---|---|---|
a. | 50°C and 30°C | |
b. | 30°C and 50°C | |
c. | 83.33°C and 20°C | |
d. | 23.33°C and 78.8°C |
Question 47
Question MCQ▾
An incompressible liquid flows through a horizontal tube as shown in trite following fig. Then the velocity v of the fluid is
Choices
Choice (4) | Response | |
---|---|---|
a. | 2.25 m/s | |
b. | 1.0 m/s | |
c. | 3.0 m/s | |
d. | 1.5 m/s |
Question 48
Question MCQ▾
A wire of cross sectional area 4mm2 is just stretched between two fixed points at a temperature of 20°C. Determine the tension when the temperature falls to 20°C. Coefficient of linear expansion a = 10-5 /°C and Y = 2 × 1011 N/m2 .
Choices
Choice (4) | Response | |
---|---|---|
a. | 220 N | |
b. | 160 N | |
c. | 120 N | |
d. | 120 KN |