Ultraviolet rays
Ultraviolet rays is a Science & Technology concept from the MPSC syllabus, tested in 3 past MPSC questions (2015, 2016, 2021). Below are those real questions with their correct answers and explanations, plus the concepts worth being comfortable with first.
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अवरक्त प्रकाश किरणांची वारंवारिता ही जांभळ्या रंगाच्या प्रकाश किरणे पेक्षा ____________. Frequency of infrared light is ____________ than violet light.
Infrared light has longer wavelengths and lower frequency compared to violet light, which has the highest frequency in the visible spectrum.
पुढील दोन विधानांपैकी कोणते योग्य आहे ? अ. अतिनील किरणे किरकोळ गाठींवर उपयुक्त ठरतात. ब. अवरक्त किरणे रासायनिक द्रव्यांचे पृथक्करण करतात. Which one of the following two statements is correct ? a. Ultraviolet rays help in diagnosis of small tumours. b. Infrared rays help in analysis of chemical compounds.
(a)अतिनील किरणे किरकोळ गाठींवर उपयुक्त ठरतात. / Ultraviolet rays help in diagnosis of small tumours.
(b)अवरक्त किरणे रासायनिक द्रव्यांचे पृथक्करण करतात. / Infrared rays help in analysis of chemical compounds.
Ultraviolet rays are not used for diagnosing small tumours (X-rays, gamma rays or MRI are used), and infrared rays are used for studying molecular structure and thermal imaging rather than general chemical compound separation.
अतिनील किरणे _________ मधून आरपार जाऊ शकत नाहीत.
(a)कांच
(b)क्वार्ट्झ
(c)फ्लूओराईट
(d)रॉक सॉल्ट (सैंधव)
Ordinary glass absorbs ultraviolet (UV) rays and does not allow them to pass through. Quartz, fluorite, and rock salt are transparent to UV rays.