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Raghav9906
Can someone please explain Q2? I cannot find the info which marks D as the correct answer

Explanation

2. According to the passage, the radiation emitted by symbiotic stars is distinctive in that it

Difficulty Level: 650-700

Explanation

A. is visible on photographic plates:
The passage mentions that on photographic plates, only the giant star can be discerned, implying that the radiation from symbiotic stars is not directly visible on photographic plates. Therefore, option A is incorrect.

B. consists partly of visible waves:
The passage states that symbiotic stars register high radiation levels in the visible region of the spectrum, indicating that visible waves are indeed a component of the radiation emitted by symbiotic stars. Therefore, option B is partially correct.

C. cannot be detected by satellite-borne instruments:
The passage specifically mentions that evidence for the existence of the hot companion in symbiotic star systems has been supplied by satellite-borne instruments that can detect ultraviolet radiation. This contradicts option C, making it incorrect.

D. is sometimes higher at the extreme ends of the spectrum:
The passage describes the radiation from symbiotic stars as having a peculiar wavelength distribution. It mentions that these systems reach high radiation levels not only in the visible region but also at shorter (ultraviolet) and longer (infrared and radio) wavelengths. This supports the idea that the radiation can be higher at the extreme ends of the spectrum. Therefore, option D is correct.

E. emanates primarily from the larger star:
The passage states that the radiation in symbiotic star systems has been identified as coming from an invisible hot companion, which implies that the radiation does not primarily emanate from the larger star. Hence, option E is incorrect.

Answer: D
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