SONAR
SONAR is a Environment concept from the MPSC syllabus, tested in 7 past MPSC questions across 5 exam years between 2013 and 2022. Below are those real questions with their correct answers and explanations, plus the concepts worth being comfortable with first.
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लेसरच्या सहाय्याने पर्यावरण सनियंत्रण करण्याच्या तंत्राला काय म्हणतात ? The laser system which is used for monitoring the environment is called
Lidar (Light Detection and Ranging) is a remote sensing method that uses light in the form of a pulsed laser to measure ranges and monitor environmental parameters.
श्रव्यातीत तरंग असे तरंग आहेत की ते Ultrasonic waves are those waves which
Ultrasonic waves have frequencies above the human hearing range (greater than 20 kHz), hence they cannot be heard by human beings.
हृदयांच्या ठोकळ्यांचे तंत्रज्ञान यावर आधारित आहे The echocardiography technique is based on
Echocardiography uses high-frequency sound waves (ultrasonic waves) to produce live images of the heart's structure and functions.
समुद्राची खोली काढण्यासाठी या तंत्राचा वापर करतात : To determine the depth of sea this technique is used :
SONAR (Sound Navigation and Ranging) uses ultrasonic waves to measure distances and determine the depth of the sea by timing the echo return.
लेसर किरण पृथ्वीवरून चंद्रकड सोडूननंतर चंद्राच्या पृष्ठभागापासून परावर्तित होऊन पृथ्वीवर परत येण्यास 2.56 सेकंद लागतात. तर चंद्राच्या पृथ्वीभोवतीच्या परिभ्रमण कक्षेची त्रिज्या किती ? A laser light beamed at the Moon takes 2.56 s to return to earth after reflection at the Moon's surface. How much is the radius of the lunar orbit around the Earth ?
Time taken for round trip is 2.56 s, so time to reach the moon (t) = 2.56 / 2 = 1.28 s. Distance (Radius) = Speed of light * time = (3 × 10⁸) × 1.28 = 3.84 × 10⁸ m.