Properties of Solids & Liquids-Heat Transfer [NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 1 - 4 of 46
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Question 1
Question MCQ▾
A wall is made up of two layers A and B. The thickness of the two layers is the same, but materials are different. The thermal conductivity of A is double than that of B. In thermal equilibrium the temperature difference between the two ends is 36°C. Then the difference of temperature at the two surfaces of A will be
Choices
Choice (4) | Response | |
---|---|---|
a. | 12°C | |
b. | 6°C | |
c. | 18°C | |
d. | 24°C |
Question 2
Question MCQ▾
While measuring the thermal conductivity of a liquid, we keep the upper part hot and lower part cool, so that
Choices
Choice (4) | Response | |
---|---|---|
a. | Heat conduction is easier downwards | |
b. | It is easier and more convenient to do so | |
c. | Convection may be stopped | |
d. | Radiation may be stopped |
Question 3
Question MCQ▾
Four rods of identical cross-sectional area and made from the same metal form the sides of square. The temperature of two diagonally opposite points are T and √ 2T respectively in the steady state. Assuming that only heat conduction takes place, what will be the temperature difference between other two points
Choices
Choice (4) | Response | |
---|---|---|
a. | ||
b. | ||
c. | 0 | |
d. | All of the above |
Question 4
Question Assertion-Reason▾
Assertion(Ꭺ)
The absorbance of a perfect black body is unity.
Reason(Ꭱ)
A perfect black body when heated emits radiations of all possible wavelengths at that temperature.
Choices
Choice (4) | Response | |
---|---|---|
a. | Ꭺ is false but Ꭱ is true | |
b. | Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ | |
c. | Both Ꭺ and Ꭱ are false | |
d. | Ꭺ is true but Ꭱ is false |