NEET (National Eligibility cum Medical Entrance Test) Physics: Questions 321 - 324 of 2142
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Question number: 321
» Kinematics » Motion in a Plane
Question
A man whirls a stone round his head on the end of a string 4.0 metre long. Can the string be in a horizontal, plane? If the stone has a mass of 0.4 kg and the string will break, if the tension in it exceeds 8 N. The smallest angle the string can make with the horizontal and the speed of the stone will respectively be (Take g = 10 m/sec 2)
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 45°, 8.2 m/s |
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| b. | 60°, 7.7 m/s |
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| c. | 60°, 8.7 m/s |
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| d. | 30°, 7.7 m/s |
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Question number: 322
» Kinematics » Average Speed and Instantaneous Velocity
Question
A disc of mass 5 gm is kept horizontally in air by firing bullets of mass 10 g each at the rate of 20/s. If the bullets rebound with same speed. The velocity with which the bullets are fired is –
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 9.28 cm/s |
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| b. | 1.25 cm/s |
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| c. | 1.96 cm/s |
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| d. | 4.89 cm/s |
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Question number: 323
» Laws of Motion » Force and Inertia
Question
A cane filled with water is revolved in a vertical circle of diameter 2 m and the water does not fall down n maximum period of revolution must be –
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 14.15 |
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| b. | 4.02 |
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| c. | 1.45 |
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| d. | 2.006 |
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Question number: 324
» Properties of Solids & Liquids » Temperature
Question
The temperature-time variation graphs, as obtained by four students 1, 2, 3 and 4 are as shown. The graphs, likely to be wrong are
Choices
| Choice (4) | Response | |
|---|---|---|
| a. |  Temperature → Time - Choice A shows the curve of temperature → time. |
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| b. |  Temperature → Time -Choice B shows the curve of temperature → time. |
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| c. |  Temperature → Time -Choice C shows the curve of temperature → time. |
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| d. |  Temperature → Time - Choice D shows the curve of temperature → time. |
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