Satellites and Services : MCQs
23. Which country operates the largest number of military and defence satellites?
A. Russia
B. China
C. United States
D. India
Answer: C. United States Explanation: The United States operates the largest number of military and defence satellites, with a total of around 235 as of 2021.
24. Which of the following is NOT an application of military and defence satellites?
A. Navigation
B. Communication
C. Intelligence gathering
D. Agriculture monitoring
Answer: D. Agriculture monitoring Explanation: Military and defence satellites are primarily used for navigation, communication, and intelligence gathering.
25. Which type of satellite is used for missile warning and detection?
A. Geosynchronous satellite
B. Low Earth orbit satellite
C. Medium Earth orbit satellite
D. Polar orbit satellite
Answer: A. Geosynchronous satellite
Explanation: Geostationary satellites are used for missile warning and detection due to their ability to provide continuous coverage of a specific region. These satellites help by detecting missile launches, space launches and nuclear detonations. These satellites use an infrared sensor to detect heat from missile and booster plumes against the Earth's background.
26. Which of the following is an example of a remote sensing satellite?
A. Hubble Space Telescope
B. Chandra X-ray Observatory
C. Landsat
D. Voyager 1
Answer: C. Landsat
Explanation: Landsat is a remote sensing satellite that collects images of Earth's surface to monitor land use, vegetation cover, and changes in the environment.
27. Which type of remote sensing uses reflected sunlight to gather data about Earth's surface?
A. Passive remote sensing
B. Active remote sensing
C. Infrared remote sensing
D. Microwave remote sensing
Answer: A. Passive remote sensing
Explanation: Passive remote sensing relies on sensors that detect natural radiation, such as sunlight, that is reflected or emitted by Earth's surface.
28. Which of the following is an application of remote sensing in agriculture?
A. Monitoring forest fires
B. Mapping ocean currents
C. Identifying crop health
D. Observing weather patterns
Answer: C. Identifying crop health Explanation: Remote sensing data can be used to monitor crops and identify areas of stress or disease, allowing farmers to take targeted action to improve yields.
29. Which of the following is a space exploration satellite that has been sent to study Mars?
A. Kepler Space Telescope
B. Cassini-Huygens
C. Mars Reconnaissance Orbiter
D. New Horizons
Answer: C. Mars Reconnaissance Orbiter
Explanation: The Mars Reconnaissance Orbiter is a NASA satellite that has been orbiting Mars since 2006, studying the planet's surface and atmosphere.
30. What type of remote sensing technology uses radar to gather data about Earth's surface?
A. Passive remote sensing
B. Active remote sensing
C. Infrared remote sensing
D. Microwave remote sensing
Answer: B. Active remote sensing
Explanation: Active remote sensing uses sensors that emit energy, such as radar, to gather information about Earth's surface.
31. Which of the following is an example of a remote sensing application in oceanography?
A. Monitoring forest fires
B. Mapping ocean currents
C. Identifying crop health
D. Observing weather patterns
Answer: B. Mapping ocean currents
Explanation: Remote sensing data can be used to map ocean currents, monitor sea surface temperature, and study the distribution of marine life.
32. Which space exploration satellite was launched to study the outer planets of our solar system?
A. Kepler Space Telescope
B. Cassini-Huygens
C. Mars Reconnaissance Orbiter
D. New Horizons
Answer: D. New Horizons
Explanation: New Horizons is a NASA satellite that was launched in 2006 to study the outer planets of our solar system, including Pluto.
33. Which of the following is a remote sensing application in environmental monitoring?
A. Monitoring forest fires
B. Mapping ocean currents
C. Identifying crop health
D. Observing weather patterns
Answer: A. Monitoring forest fires
Explanation: Remote sensing data can be used to monitor forest fires, track changes in vegetation cover, and study the effects of climate change.
34. Which space exploration satellite was launched to study the sun and its effects on Earth's atmosphere?
A. Solar Dynamics Observatory
B. Chandra X-ray Observatory
C. Hubble Space Telescope
D. Spitzer Space Telescope
Answer: A. Solar Dynamics Observatory
Explanation: The Solar Dynamics Observatory is a NASA satellite that was launched in 2010 to study the sun and its effects on Earth's atmosphere.
35. What is the main application of remote sensing in geology?
A. Identifying crop health
B. Mapping ocean currents
C. Studying land use and vegetation cover
D. Mapping mineral deposits and geological structures
Answer: D. Mapping mineral deposits and geological structures
Explanation: Remote sensing technology is used extensively in the field of geology to study the Earth's surface and subsurface structures. By analyzing data from satellite sensors and aerial platforms, geologists can identify mineral deposits and geological structures such as faults, folds, and volcanoes. This information can be used for mineral exploration, hazard assessment, and geological mapping. Remote sensing can also be used to identify and monitor changes in land use and vegetation cover, as well as to study ocean currents and the atmosphere.
