NEET Physics: Questions 206 - 210 of 2142
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Question number: 206
» Communication System » Propagation of Electromagnetic Waves in the Atmosphere
Question
The vernier constant of two vernier calipers A and B are 0.01 cm and 0.01 mm respectively. Which one can measure the length of an object more accurately?
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | Accuracy in measurement does not depend on vernier constant |
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| b. | Vernier B |
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| c. | Vernier A |
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| d. | All of the above |
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Question number: 207
» Communication System » Propagation of Electromagnetic Waves in the Atmosphere
Question
One cm on the main scale of a vernier calipers is divided into ten equal parts. If 20 divisions of vernier scale coincide with 8 small divisions of the main scale. What will be the least count of calipers?
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 0.05 cm |
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| b. | 0.06 cm |
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| c. | 0.04 cm |
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| d. | 0.01 cm |
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Question number: 208
» Electrostatics » Electrostatic Potential Energy
Question
Two identical charges are placed at the two corners of an equilateral triangle. The potential energy of the system is U. The work done in bringing an identical charge from Infinity to the third vertex is
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | zero |
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| b. | 2U |
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| c. | U |
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| d. | 3U |
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Question number: 209
» Electrostatics » Electric Charges
Assertion (Ꭺ)
Surface of a symmetrical conductor can be treated as equipotential surface.
Reason (Ꭱ)
Charges can easily flow in a conductor.
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ |
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| b. | Ꭺ is true but Ꭱ is false |
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| c. | Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ |
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| d. | Ꭺ is false but Ꭱ is true |
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Question number: 210
» Physics and Measurement » Dimensional Analysis and Its Applications
Question
In an experiment the angles are required to be measured using an instrument, 29 divisions of the main scale exactly coincide with the 30 divisions of the vernier scale. If the smallest division of the main scale is half- a degree (= 0.5°), then the least count of the instrument is:
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | half minute |
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| b. | one minute |
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| c. | one degree |
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| d. | half degree |
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