RRB Technician Grade 3 practice question
The echo of the sound of a boy standing in front of a mountain is heard after 0.2 s. What is the distance of the mountain from the boy when speed of the sound is 342 m/s?
From a RRB Technician Grade 3 Science practice set · Science
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Correct answer: (A) 34.2 m
Distance = (speed x time)/2 = (342 x 0.2)/2 = 34.2 m, since sound travels to the mountain and back.
हिंदी में प्रश्न
संस्पर्श लेंस (कॉन्टेक्ट लेंस) सामान्यतः किससे बनते हैं? A. टेफ़लोन B. हाइड्रोजेल C. नायलॉन D. माइका
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (A) 34.2 m
दूरी = (चाल x समय)/2 = (342 x 0.2)/2 = 34.2 मीटर, क्योंकि ध्वनि पहाड़ तक जाकर वापस आती है।
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