NEET Physics: Questions 1407 - 1411 of 2142
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Question number: 1407
» Properties of Solids & Liquids » Heat Transfer » Radiation
Question
A body cools from 90° C to 50° C in 10 minutes. If the room temperature is 25° C and assuming Newton’s law of cooling to hold good, the temperature of the body at the end of the next 10 minutes will be
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 56.40° C |
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| b. | 34.61° C |
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| c. | 46.75° C |
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| d. | 42.85° C |
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Question number: 1408
» Properties of Solids & Liquids » Specific Heat Capacity
Question
A beaker contains 400 gm of water. The heat capacity the beaker is equal to that of 20 gm of water. The initial temperature of water in the beaker is 20°C. If 240 gm hot water at 92°C is poured in it, the final temperature (neglecting radiation loss) will be nearest to
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 12.58°C |
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| b. | 46.18°C |
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| c. | 6.348°C |
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| d. | 73.4°C |
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Question number: 1409
» Properties of Solids & Liquids » Surface Energy and Surface Tension
Question
Radius of a capillary tube is 4 × 10 -3 m. A liquid of weight 5.20 × 10 -4 N may remain in the capillary tube then the surface tension of liquid will be
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 2.3 × 10 -2 N/m |
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| b. | 20 N/m |
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| c. | 2.0 × 10 -2 N/m |
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| d. | 20 × 10 -3 N/m |
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Question number: 1410
» Properties of Solids & Liquids » Heat Transfer » Convection
Question
When fluids are heated from the bottom, convection currents are produced because
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | Heated fluid becomes less dense than the cold fluid above it |
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| b. | Molecular motion of fluid becomes aligned |
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| c. | Heated fluid becomes more dense than the cold fluid above it |
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| d. | Molecular collisions take place within the fluid |
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Question number: 1411
» Properties of Solids & Liquids » Young's Modulus
Question
For a given material, the Young’s modulus is 2.4 times that of rigidity modulus. Its Poisson’s ratio is
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 2 |
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| b. | 0.2 |
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| c. | 1.02 |
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| d. | 1.2 |
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