#1
Which planet is known as the 'Red Planet'?
Mars
ExplanationDue to its reddish appearance from iron oxide on its surface.
#2
What is the primary function of a telescope?
To observe distant objects
ExplanationIt gathers and focuses light to create images of celestial objects.
#3
Which of the following is NOT a type of optical telescope?
Radio telescope
ExplanationIt uses radio waves instead of light.
#4
Who was the first person to use a telescope for astronomical observations?
Galileo Galilei
ExplanationHe made significant astronomical discoveries using his telescope.
#5
Which of the following is NOT a type of optical aberration?
Cosmic aberration
ExplanationThis term is not recognized in optical aberration classification.
#6
What is the phenomenon where a total solar eclipse occurs?
When the moon completely blocks the sun
ExplanationCreates a temporary darkness during the day.
#7
What is the term for the point in an orbit where a satellite is farthest from the Earth?
Apogee
ExplanationOpposite of perigee, the closest point.
#8
What does 'AU' stand for in astronomy?
Astronomical Unit
ExplanationThe average distance between the Earth and the Sun.
#9
Which optical instrument is used to study the spectra of stars?
Spectroscope
ExplanationIt breaks down light into its component wavelengths for analysis.
#10
Which planet has the most moons in our solar system?
Jupiter
ExplanationIt has over 79 known moons.
#11
What is the name of the largest optical telescope on Earth?
Keck Observatory
ExplanationLocated in Hawaii, it consists of two telescopes.
#12
What is the name of the imaginary line around which Earth rotates?
Axis
ExplanationIt passes through the North and South Poles.
#13
Which optical instrument is used to measure angles in the sky?
Sextant
ExplanationPrimarily used in navigation but can also measure celestial angles.
#14
Which type of telescope uses a mirror to gather and focus light?
Reflecting telescope
ExplanationPopularized by Newton, it reduces chromatic aberration.
#15
What is the name of the phenomenon where light bends as it passes through different mediums?
Refraction
ExplanationOccurs due to the change in speed of light.
#16
What is the phenomenon where an object's apparent position changes due to the observer's movement called?
Parallax
ExplanationUsed to measure distances to nearby stars.
#17
What is the name of the effect where light is spread out into its component colors?
Dispersion
ExplanationCommonly seen in rainbows and prisms.
#18
Who proposed the heliocentric model of the solar system?
Nicolaus Copernicus
ExplanationRevolutionized astronomy with his Sun-centered model.
#19
What is the name of the process by which stars convert hydrogen into helium?
Fusion
ExplanationPrimary source of energy in main sequence stars.