Properties of Solids & Liquids (NEET Physics): Questions 83 - 86 of 188
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Question number: 83
» Properties of Solids & Liquids » Heat Transfer » Radiation
Question
Consider two hot bodies B 1 and B 2 which have temperature 100° C and 80° C respectively at t = 0. The temperature of surroundings is 40° C. The ratio of the respective rates of cooling R 1 and R 2 of these two bodies at t = 0 will be,
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | R 1: R 2 = 3: 2 |
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| b. | R 1: R 2 = 2: 3 |
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| c. | R 1: R 2 = 5: 4 |
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| d. | R 1: R 2 = 4: 5 |
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Question number: 84
» Properties of Solids & Liquids » Thermal Expansion
Question
A rod of length 20 cm is made of metal. It expands by 0.075 cm when its temperature is raised from 0°C to 100°C. Another rod of a different metal B having the same length expands by 0.045 cm for the same change in temperature. A third rod of the same length is composed of two parts, one of metal A and the other of metal B. This rod expands by 0.060 cm for the same change in temperature. The portion made of metal A has the length
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 10 cm |
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| b. | 15 cm |
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| c. | 18 cm |
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| d. | 20 cm |
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Question number: 85
» Properties of Solids & Liquids » Modulus of Rigidity
Question
The compressibility of water is 5 × 10 -10 m 2 /N. If it is subjected to a pressure of 20 MPa the fractional decrease in volume will be -
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 7.5 ×10 -3 |
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| b. | 5.0 × 10 -3 |
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| c. | 1.5 × 10 -2 |
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| d. | 3.3 × 10 -5 |
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Question number: 86
» Properties of Solids & Liquids » Thermal Expansion
Question
Density of a substance at 0°C is 10 gm/cc and at 100°C, its density is 9.7 gm/cc. The coefficient of linear expansion of the substance will be
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 10 2 |
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| b. | 10 -3 |
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| c. | 10 -4 |
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| d. | 10 -2 |
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