Selected MCQ

Current Question
Which nearby star system had four rocky exoplanets confirmed around it by 2025?
  • A. Barnard's Star
  • B. Proxima Centauri
  • C. Sirius
  • D. Vega
Correct Answer: A
Explanation:
Four small rocky planets were confirmed around Barnard's Star (though none are in the habitable zone).
Related Question 1
What is the Goldilocks zone around a star?
  • A. Region where liquid water could exist
  • B. Area with intense radiation
  • C. Outer space boundary
  • D. Planet formation zone
Correct Answer: A
Explanation:
The Goldilocks (habitable) zone is where conditions may allow liquid water.
Related Question 2
What method do astronomers use when they detect exoplanets by observing a star's light dimming at regular intervals?
  • A. Radial velocity method
  • B. Transit method
  • C. Direct imaging
  • D. Astrometry
Correct Answer: B
Explanation:
The transit method identifies exoplanets by periodic dips in a star's brightness as a planet crosses its face.
Related Question 3
What type of celestial object is often referred to as a "baby star" still in formation?
  • A. White dwarf
  • B. Brown dwarf
  • C. Protostar
  • D. Red giant
Correct Answer: C
Explanation:
A protostar is a very young star still forming from a collapsing gas cloud.
Related Question 4
Which of the following is NOT a dwarf planet in our solar system?
  • A. Pluto
  • B. Eris
  • C. Haumea
  • D. Titan
Correct Answer: D
Explanation:
Titan is a large moon of Saturn, not classified as a dwarf planet.
Related Question 5
In robot path planning, what is the role of the A* (A star) algorithm?
  • A. Mapping 3D environment
  • B. Optimal path search on a graph of possible moves
  • C. Real-time motion control
  • D. Image processing
Correct Answer: B
Explanation:
A* is a pathfinding algorithm that efficiently finds optimal paths on graphs or grids.