71. What is the name of the process by which a solid becomes a gas?
a) Condensation
b) Evaporation
c) Sublimation
d) Fusion
Answer: c) Sublimation
72. What is the name of the region of space around a black hole from which nothing can escape?
a) Event horizon
b) Singularity
c) Accretion disk
d) Photon sphere
Answer: a) Event horizon
73. What is the name of the largest moon in our solar system?
a) Europa
b) Titan
c) Ganymede
d) Io
Answer: c) Ganymede
74. What is the name of the theory that describes how the planets formed from a disk of gas and dust around the Sun?
a) Nebular theory
b) Geocentric theory
c) Heliocentric theory
d) Copernican theory
Answer: a) Nebular theory
75. What is the name of the brightest star in the night sky?
a) Betelgeuse
b) Sirius
c) Vega
d) Procyon
Answer: b) Sirius
