Welcome to the Exoplanet Discoveries MCQs with Answers. In this post, we are sharing Exoplanet Discoveries Multiple Choice Questions and Answers in Astronomy section for various competitive exams in Pakistan. Each question offers a chance to enhance your knowledge regarding Exoplanet Discoveries online MCQs Test.
Which method was first used to discover exoplanets?
a) Radial velocity
b) Transit photometry
c) Direct imaging
d) Gravitational microlensing
What is the name of the first exoplanet discovered orbiting a Sun-like star?
a) 51 Pegasi b
b) Proxima Centauri b
c) HD 209458 b
d) Gliese 581 g
Which space mission has been pivotal in discovering thousands of exoplanets using the transit method?
a) Hubble Space Telescope
b) Kepler Space Telescope
c) James Webb Space Telescope
d) Chandra X-ray Observatory
What does the radial velocity method measure to detect exoplanets?
a) Changes in a star’s light spectrum
b) Variations in a star’s brightness
c) The gravitational pull of an exoplanet
d) The position of an exoplanet relative to its star
Which of the following exoplanet discovery methods is based on the gravitational lensing effect?
a) Radial velocity
b) Direct imaging
c) Gravitational microlensing
d) Transit photometry
What was the first exoplanet discovered around a pulsar?
a) PSR B1257+12 b
b) 51 Pegasi b
c) HD 209458 b
d) Proxima Centauri b
Which planet discovery method involves measuring the dimming of a star’s light as a planet transits in front of it?
a) Transit photometry
b) Radial velocity
c) Direct imaging
d) Gravitational microlensing
Which exoplanet discovery technique uses the effect of a planet’s gravitational pull on its star to detect planets?
a) Radial velocity
b) Transit photometry
c) Direct imaging
d) Astrometry
Which of the following was a key milestone in the discovery of exoplanets?
a) The discovery of 51 Pegasi b
b) The launch of Hubble Space Telescope
c) The detection of gravitational waves
d) The discovery of the first black hole
Which space mission has used direct imaging to discover exoplanets?
a) Spitzer Space Telescope
b) Kepler Space Telescope
c) Gemini Planet Imager
d) Chandra X-ray Observatory
Which method of detecting exoplanets involves looking for periodic dips in a star’s brightness?
a) Transit method
b) Radial velocity method
c) Gravitational microlensing
d) Direct imaging
What was the first exoplanet discovered around a main-sequence star?
a) 51 Pegasi b
b) PSR B1257+12 b
c) HD 209458 b
d) Gliese 581 g
Which space telescope was the first to detect an exoplanet using the transit method?
a) Kepler Space Telescope
b) Hubble Space Telescope
c) Spitzer Space Telescope
d) Chandra X-ray Observatory
Which technique involves observing the wobble of a star due to the gravitational influence of an orbiting planet?
a) Radial velocity
b) Direct imaging
c) Transit photometry
d) Gravitational microlensing
Which of the following exoplanets was discovered by the radial velocity method?
a) 51 Pegasi b
b) Proxima Centauri b
c) HD 209458 b
d) Kepler-22 b
What is the main goal of the James Webb Space Telescope in terms of exoplanet research?
a) To study the atmospheres of exoplanets
b) To detect exoplanets using transit photometry
c) To directly image exoplanets
d) To map the Milky Way
Which of the following methods is best suited for detecting exoplanets that are very far from their host stars?
a) Direct imaging
b) Radial velocity
c) Transit photometry
d) Gravitational microlensing
Which of the following is a characteristic of “hot Jupiters,” a type of exoplanet?
a) They are large and orbit very close to their stars
b) They are small and orbit far from their stars
c) They have icy compositions
d) They are rocky planets
Which space observatory was specifically designed to find Earth-like exoplanets in the habitable zone?
a) Kepler Space Telescope
b) Spitzer Space Telescope
c) Hubble Space Telescope
d) Chandra X-ray Observatory
Which of the following techniques is used to find exoplanets by observing the star’s light bending around the planet?
a) Gravitational microlensing
b) Radial velocity
c) Direct imaging
d) Transit photometry
Which exoplanet discovery technique relies on measuring the change in a star’s light curve?
a) Transit photometry
b) Radial velocity
c) Direct imaging
d) Astrometry
The first exoplanet discovered orbiting a Sun-like star was found in which year?
a) 1995
b) 2000
c) 2003
d) 2010
Which space mission is focused on characterizing the atmospheres of exoplanets?
a) James Webb Space Telescope
b) Kepler Space Telescope
c) Spitzer Space Telescope
d) Hubble Space Telescope
Which exoplanet discovery method uses the star’s light to directly observe the planet?
a) Direct imaging
b) Transit photometry
c) Radial velocity
d) Gravitational microlensing
Which of the following exoplanets was discovered using the transit method?
a) HD 209458 b
b) 51 Pegasi b
c) Proxima Centauri b
d) PSR B1257+12 b
Which technique involves measuring the variations in the star’s light spectrum to detect exoplanets?
a) Radial velocity
b) Direct imaging
c) Gravitational microlensing
d) Transit photometry
What type of exoplanets are often found using gravitational microlensing?
a) Planets with very distant orbits
b) Close-in gas giants
c) Rocky planets in the habitable zone
d) Hot Jupiters
Which exoplanet discovery method involves detecting variations in a star’s position relative to distant background stars?
a) Astrometry
b) Direct imaging
c) Radial velocity
d) Transit photometry
Which of the following was the first exoplanet discovered using gravitational microlensing?
a) MOA-2007-BLG-192Lb
b) 51 Pegasi b
c) HD 209458 b
d) Proxima Centauri b
What is the main advantage of the radial velocity method over the transit method?
a) It can detect planets that do not transit their stars
b) It is better for finding Earth-like planets
c) It provides more information about the planet’s atmosphere
d) It can observe very distant exoplanets
Which method involves analyzing variations in a star’s brightness due to an exoplanet passing in front of it?
a) Transit photometry
b) Radial velocity
c) Direct imaging
d) Gravitational microlensing
Which space mission’s primary goal was to discover exoplanets by measuring the tiny variations in a star’s position?
a) Gaia
b) Kepler Space Telescope
c) Hubble Space Telescope
d) Spitzer Space Telescope
Which of the following is a challenge in direct imaging of exoplanets?
a) Brightness contrast between the star and the planet
b) Detecting variations in the star’s light spectrum
c) Measuring the radial velocity of the star
d) Observing gravitational microlensing events
Which discovery method has been used to find the largest number of exoplanets to date?
a) Transit photometry
b) Radial velocity
c) Direct imaging
d) Gravitational microlensing
Which of the following is not a method used to discover exoplanets?
a) Astrometry
b) Radial velocity
c) Cosmic microwave background
d) Direct imaging
What does the term “hot Jupiter” refer to in exoplanet discoveries?
a) A type of gas giant planet with a very close orbit to its star
b) A rocky exoplanet with a high surface temperature
c) A small ice giant planet
d) A planet with a highly elliptical orbit
Which exoplanet discovery method involves the observation of a star’s light curve over time?
a) Transit photometry
b) Radial velocity
c) Direct imaging
d) Gravitational microlensing
What is a primary limitation of the radial velocity method in exoplanet discovery?
a) It is less effective for detecting planets with long orbital periods
b) It requires very high-resolution imaging
c) It is not suitable for finding small planets
d) It is dependent on the star’s brightness
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