NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1874 - 1877 of 2247
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Question number: 1874
» Communication System » Propagation of Electromagnetic Waves in the Atmosphere
Question
Assertion (Ꭺ)
Television signals are not received through sky-wave propagation.
Reason (Ꭱ)
The ionosphere reflects electromagnetic waves of frequencies greater than a certain critical frequency.
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 false |
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| d. | Ꭺ is false but Ꭱ is true |
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Question number: 1875
» Gravitation » Escape Velocity
Question
Gas escapes from the surface of a planet because it acquires an escape velocity. The escape velocity will depend on which of the following factors:
(1) Mass of the planet
(2) Radius of the planet
(3) Mass of the particle escaping
(4) Temperature of the planet
Select the correct answers with mark it according to the following codes:
Choices
| Choice (4) | Response | |
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| a. | 1 and 2 are correct |
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| b. | 1.2 and 3 are correct |
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| c. | 1 and 3 are correct |
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| d. | 1 and 4 are correct |
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Question number: 1876
» Gravitation » Energy
Question
Two satellites P and Q of same mass are revolving near the earth surface in the equatorial plane. The satellite P moves in the direction of rotation of earth whereas Q moves in the opposite direction. The ratio of their kinetic energies with respect to a frame attached to earth will be –
Choices
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Question number: 1877
» Gravitation » Gravitational Potential
Question
Two satellites S 1 and S 2 revolve round a planet in the same direction in circular orbits. Their periods of revolutions are 1 hour and 6 hour respectively. The radius of S 1 is 1.5 ⨯ 10 5 km. The velocity of S 2 with respect to S 1 will be
Choices
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