NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1212 - 1216 of 2142
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Question number: 1212
» Properties of Solids & Liquids » Elastic Behavior
Question
A wire of cross sectional area 4mm 2 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 × 10 11 N/m 2.
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 220 N |
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| b. | 120 KN |
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| c. | 160 N |
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| d. | 120 N |
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Question number: 1213
» Wave Optics » Young's Double Slit Experiment
Question
The intensity of the light coming from one of the slits in a young’s double slit experiment is double the intensity from the other slit. Find the ratio of the maximum intensity to the minimum intensity in the interference fringe pattern observed.
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 9: 1 |
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| b. | 34: 1 |
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| c. | 4: 1 |
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| d. | 16: 1 |
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Question number: 1214
» Wave Optics » Wavefront
Question
When a wave of wavelength 0.2 cm is made incident normally on a slit of width 0.004m, then the semi-angular width of central maximum of diffraction pattern will be
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 0° |
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| b. | 30° |
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| c. | 60° |
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| d. | 90° |
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Question number: 1215
» Properties of Solids & Liquids » Heat Transfer » Conduction
Question
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 30°C. Then the difference of temperature at the two surfaces of A will be
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 12°C |
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| b. | 10°C |
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| c. | 24°C |
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| d. | 18°C |
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Question number: 1216
» Properties of Solids & Liquids » Surface Energy and Surface Tension
Question
A film of water is formed between two straight parallel wires of length 15 cm each separated by 0.5 cm. If their separation is increased by 1 mm while still maintaining their parallelism, how much work will have to be done (Surface tension of water = 70 × 10 -2 N/m)
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 2.16 × 10 -5 Joule |
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| b. | 1.44 × 10 -5 Joule |
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| c. | 7.22 × 10 -6 Joule |
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| d. | 5.76 × 10 -5 Joule |
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