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Twelfth Grade (Grade 12) Science Questions

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Grade 12 Physics
Which orbit allows a satellite to remain over the same point on the Earth's surface at all times?
  1. Polar Orbit
  2. Geostationary Orbit (GEO)
  3. Low Earth Orbit (LEO)
  4. Elliptical Orbit
Grade 12 Physics
What is the primary advantage of Low Earth Orbit (LEO) satellites?
  1. Longer lifespan
  2. Shorter communication delay (lower latency)
  3. Better coverage of polar regions
  4. Lower signal strength
Grade 12 Physics
Which satellite orbit is best suited for global positioning systems (GPS)?
  1. Geostationary Orbit (GEO)
  2. Low Earth Orbit (LEO)
  3. Medium Earth Orbit (MEO)
  4. High Earth Orbit (HEO)
Grade 12 Physics
Which of the following is the most commonly used digital broadcasting standard in Europe?
  1. NTSC
  2. PAL
  3. DVB (Digital Video Broadcasting)
  4. SECAM
Grade 12 Physics
What is the key difference between analog and digital TV broadcasting?
  1. Analog uses FM, and digital uses AM
  2. Analog signals are continuous waves, while digital signals are binary data
  3. Digital TV has poorer quality than analog TV
  4. Analog TV requires more bandwidth than digital TV
Grade 12 Physics
Which frequency band is commonly used for FM radio broadcasting?
  1. Very High Frequency (VHF)
  2. Medium Frequency (MF)
  3. Ultra High Frequency (UHF)
  4. Low Frequency (LF)
Grade 12 Physics
Which of the following is a key factor limiting the range of FM radio transmission?
  1. Low frequency
  2. Ionospheric reflection
  3. Line-of-sight transmission
  4. Weak signal strength
Grade 12 Physics
In radio broadcasting, what is the function of the antenna at the transmitter?
  1. To receive radio waves from other stations
  2. To modulate the carrier wave
  3. To convert electrical signals into electromagnetic waves
  4. To amplify the audio signal
Grade 12 Physics
Which of the following is an example of a contact force?
  1. Gravity
  2. Electrostatic force
  3. Friction
  4. Magnetic force
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