NEET Physics: Questions 1848 - 1854 of 2098
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Question number: 1848
» Gravitation » Escape Velocity
Question
Acceleration due to gravity on a planet is 12 times the value on the earth. Escape velocity for the planet and the earth are V p and V e respectively. The ratio of the radii of the planet and the earth is 2: 1, then –
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Question number: 1849
» Oscillations and Waves » Doppler Effect in Sound
Question
A whistle sends out 210 waves in a second. If the whistle approaches the observer with velocity 1/4 of the velocity of sound in air, the number of waves per second the observer will receive
Choices
| Choice (4) | Response | |
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| a. | 384 |
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| b. | 320 |
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| c. | 182 |
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| d. | 280 |
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Question number: 1850
» Communication System » Sky and Space Wave Propagation
Question
Maximum usable frequency (MUF) in F-region layer is x, when the critical frequency is 55 MHz and the angle of incidence is 60°. Then x is (cos 70° = 0.34)
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| Choice (4) | Response | |
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| a. | 120 MHz |
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| b. | 110 MHz |
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| c. | 109 MHz |
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| d. | 150 MHz |
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Passage
Read the passage given below and answer the questions that follow:
The electron density of a layer of ionosphere at a height 150 km from the earth’s surface is 9 ⨯ 10 9 per m 3. For the sky transmission from this layer up to a range of 250 km,
Question number: 1851 (1 of 3 Based on Passage) Show Passage
» Communication System » Sky and Space Wave Propagation
Question
The critical frequency of the layer is
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| Choice (4) | Response | |
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| a. | 2.7 Hz |
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| b. | 2 Hz |
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| c. | 2.7 MHz |
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| d. | 2.78 kHz |
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Question number: 1852 (2 of 3 Based on Passage) Show Passage
» Communication System » Bandwidth of Signals
Question
Maximum usable frequency is,
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| Choice (4) | Response | |
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| a. | 3.5 Hz |
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| b. | 3.5 ⨯ 10 6 HZ |
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| c. | 3.5 ⨯ 10 10 Hz |
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| d. | 3.5 ⨯ 10 3 Hz |
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Question number: 1853 (3 of 3 Based on Passage) Show Passage
» Communication System » Basic Elements of Communication System
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Angle of incidence of this layer is
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| d. | 0 0 |
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Question number: 1854
» Experimental Skills » P-N Junction Diode
Question
Four diodes shown in the following diagrams, which one is reverse biased?
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| Choice (4) | Response | |
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| a. |  Diagram of Diode and Resistance Choice A Figure shows the circuit diagram, in which pn-junction diode connected with resistance between two different potential. |
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| b. |  Diagram of Diode and Resistance Choice B Figure shows the circuit diagram, in which pn-junction diode connected with resistance between two different potential. |
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| c. |  Diagram of Diode and Resistance Choice C Figure shows the circuit diagram, in which pn-junction diode connected with resistance between two different potential. |
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| d. |  Diagram of Diode and Resistance Choice D Figure shows the circuit diagram, in which pn-junction diode connected with resistance between two different potential. |
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