Satellites — Set 4
Technology · उपग्रह · Questions 31–40 of 50
Which country launched the first telecommunications satellite, Telstar 1?
Correct Answer: A. USA
Telstar 1 was launched by the USA in 1962 as a collaborative project between NASA and AT&T. It enabled the first live television transmission between Europe and North America. This satellite pioneered the modern era of global satellite communications.
Which satellite is known as India's 'Eye in the Sky' for its all-weather surveillance capabilities?
Correct Answer: A. RISAT
RISAT (Radar Imaging Satellite) uses Synthetic Aperture Radar to see through clouds and darkness. This makes it invaluable for border security, disaster management, and agriculture during the monsoon. It can provide high-resolution imagery regardless of lighting conditions.
What is the primary purpose of the Galileo satellite constellation?
Correct Answer: B. European global navigation
Galileo is the European Union's independent global satellite navigation system. It was designed to provide high-precision positioning data to civilians worldwide. It serves as an alternative to the US GPS and Russian GLONASS systems.
Which Indian satellite was the first to explore the Moon's surface?
Correct Answer: A. Chandrayaan-1
Chandrayaan-1 was launched in 2008 and is famous for discovering water molecules on the lunar surface. It carried an Impact Probe that deliberately crashed into the South Pole of the Moon. This mission significantly enhanced India's prestige in planetary exploration.
What does 'LEOP' stand for in satellite mission operations?
Correct Answer: B. Launch and Early Orbit Phase
LEOP is the most critical phase of a satellite mission immediately after it separates from the rocket. During this phase, engineers check the satellite's health and deploy its solar panels. Once stable, the satellite is moved into its final functional orbit.
Which type of satellite is used to provide direct-to-home (DTH) television services?
Correct Answer: B. Communication Satellite
Communication satellites in geostationary orbit relay high-frequency signals to household dishes. They allow broadcasters to cover entire continents with a single satellite. GSAT and INSAT are the main series used for DTH in India.
Which satellite was launched by ISRO to study the Sun?
Correct Answer: B. Aditya-L1
Aditya-L1 is India's first dedicated space mission to observe the Sun's atmosphere. It is placed at the Lagrange Point 1 (L1) of the Sun-Earth system to have an uninterrupted view. The mission helps in understanding solar flares and space weather.
What is the function of an 'Attitude Control' system in a satellite?
Correct Answer: A. Controlling the satellite's orientation in space
Attitude control ensures that the satellite's antennas and sensors are pointed precisely at their targets. It uses small thrusters or reaction wheels to adjust the satellite's position. Proper orientation is vital for maintaining communication and power levels.
Which country launched the 'BeiDou' navigation satellite system?
Correct Answer: C. China
BeiDou is China's global navigation satellite system, reaching full global coverage in 2020. It serves as a competitor to GPS and provides high-accuracy positioning and messaging. It is part of China's broader goal for independent space technology.
What is the primary purpose of 'Resourcesat' satellites?
Correct Answer: B. Mapping and managing natural resources
Resourcesat satellites provide data on agriculture, forest cover, and groundwater levels. They are a key part of India's remote sensing program for national development. The data helps in yield estimation and identifying drought-hit areas.