NEET Physics: Questions 1843 - 1847 of 2142
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Question number: 1843
» Communication System » Basic Elements of Communication System
Question
The phenomenon by which light travels in an optical fibers
Choices
| Choice (4) | Response | |
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| a. | Transmission |
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| b. | Total internal reflection |
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| c. | Refraction |
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| d. | Re-reflection |
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Question number: 1844
» Gravitation » Orbital Velocity of a Satellite
Question
A satellite has to revolve round the earth in a circular orbit of radius 8 ⨯ 10 3 km. The velocity of projection of the satellite in this orbit will be -
Choices
| Choice (4) | Response | |
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| b. |
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| c. |
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Question number: 1845
» Oscillations and Waves » Doppler Effect in Sound
Question
A whistle sends out 256 waves in a second. If the whistle approaches the observer with velocity 1/3 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. | 300 |
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| c. | 200 |
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| d. | 192 |
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Question number: 1846
» Gravitation » Kepler's Laws of Planetary Motion
Question
The Jupiter s period of revolution round the Sun is 10 times that of the Earth. Assuming the planetary orbits are circular, how many times the distance between the Jupiter and Sun exceeds that between the Earth and the sun.
Choices
| Choice (4) | Response | |
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| a. | 5.242 |
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| b. | 2.242 |
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| c. | 4.641 |
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| d. | 4.242 |
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Question number: 1847
» Experimental Skills » Potentiometer
Question
The potential gradient of a potentiometer can be increased by which of the following operation?
Choices
| Choice (4) | Response | |
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| a. | By increasing the area of cross-section of potentiometer wire. |
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| b. | By decreasing the current through it. |
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| c. | By using a wire of material of low specific resistance. when A is decreased, k will increase. |
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| d. | By decreasing the area of cross-section of the potentiometer wire. |
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