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 (1962)** = first transatlantic TV transmission satellite (USA). • **Global comms pioneer** — NASA-AT&T partnership; Europe-North America live broadcast. • 💡 Wrong-option analysis: B (France): Symphonie; C (UK): Ariel; D (USSR): Molniya later.
Which satellite is known as India's 'Eye in the Sky' for its all-weather surveillance capabilities?
Correct Answer: A. RISAT
• **RISAT (Radar Imaging)** = Synthetic Aperture Radar; all-weather surveillance. • **24/7 capability** — clouds/darkness penetration; border, disaster, agriculture monitoring. • 💡 Wrong-option analysis: B (GSAT): comm satellite; C (INSAT): weather; D (Oceansat): ocean biology.
What is the primary purpose of the Galileo satellite constellation?
Correct Answer: B. European global navigation
• **Galileo constellation** = EU's independent global navigation system. • **Civil positioning alternative** — to GPS and GLONASS; high-precision worldwide. • 💡 Wrong-option analysis: A (weather): meteorological satellites; C (Moon): lunar missions; D (UN military): national systems, not UN-controlled.
Which Indian satellite was the first to explore the Moon's surface?
Correct Answer: A. Chandrayaan-1
• **Chandrayaan-1 (2008)** = India's lunar probe; water discovery on Moon. • **Impact Probe lunar crash** — South Pole observations; planetary exploration prestige. • 💡 Wrong-option analysis: B (Mangalyaan): Mars mission; C (Aryabhata): first satellite; D (Astrosat): space telescope.
What does 'LEOP' stand for in satellite mission operations?
Correct Answer: B. Launch and Early Orbit Phase
• **LEOP phase** = post-separation deployment and health check critical period. • **System deployment** — solar panels, antennas activation; stabilization before final orbit. • 💡 Wrong-option analysis: A (observation point): earth observation location; C (electronic probe): equipment type; D (lunar entry): moon landing phase.
Which type of satellite is used to provide direct-to-home (DTH) television services?
Correct Answer: B. Communication Satellite
• **Communication satellites (GEO)** = relay TV signals to household dishes. • **Continental coverage** — single satellite spans continent; GSAT/INSAT Indian DTH. • 💡 Wrong-option analysis: A (polar): global mapping orbit; C (MEO): navigation orbit; D (sun-sync): earth observation.
Which satellite was launched by ISRO to study the Sun?
Correct Answer: B. Aditya-L1
• **Aditya-L1 mission** = India's dedicated solar atmosphere observatory. • **L1 positioning** — unobstructed Sun view; studies flares and space weather. • 💡 Wrong-option analysis: A (Astrosat): multi-wavelength cosmic; C (Mangalyaan): Mars; D (Gaganyaan): human spaceflight.
What is the function of an 'Attitude Control' system in a satellite?
Correct Answer: A. Controlling the satellite's orientation in space
• **Attitude control system** = keeps antennas/sensors precisely aimed. • **Thrust/reaction wheels** — small maneuvers maintain orientation for comms and power. • 💡 Wrong-option analysis: B (weight measurement): mass property; C (cost): budget item; D (temperature): thermal management.
Which country launched the 'BeiDou' navigation satellite system?
Correct Answer: C. China
• **BeiDou system (2020)** = China's independent global navigation constellation. • **GPS competitor** — high-accuracy positioning and messaging; space independence goal. • 💡 Wrong-option analysis: A (Japan): indigenous is minimal; B (Korea): limited; D (India): NavIC regional only.
What is the primary purpose of 'Resourcesat' satellites?
Correct Answer: B. Mapping and managing natural resources
• **Resourcesat series** = agriculture, forests, groundwater earth observation. • **National development data** — yield estimation, drought monitoring for policy. • 💡 Wrong-option analysis: A (underwater mines): sonar detection; B (sports): communications; D (broadcasting): separate system.