RRB NTPC CBT-1 previous year question
The angle of elevation of the top of a building from a point 40 m away is 45°. What is the height of the building?
Asked in RRB NTPC 2026 — 16 June Shift 1 · Quantitative Aptitude
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Correct answer: (B) 40 m
At 45 degrees elevation, the height of the building equals the horizontal distance from the observation point, since tan(45°)=1. So height = 40 m.
हिंदी में प्रश्न
40 m दूर स्थित एक बिंदु से किसी भवन के शीर्ष का उन्नयन कोण 45 है। भवन की ऊँचाई कितनी है?
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सही उत्तर: (B) 30
45 डिग्री उन्नयन कोण पर, भवन की ऊँचाई प्रेक्षण बिंदु से क्षैतिज दूरी के बराबर होती है, क्योंकि tan(45°)=1। अतः ऊँचाई = 40 मीटर।
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