Phisicis Flashcards
What is the basic unit of distance in space?
The meter.
True or False: Light travels faster in space than in air.
True.
Fill in the blank: The speed of light in a vacuum is approximately ______ kilometers per second.
299,792.
What is the name of the force that keeps planets in orbit around the sun?
Gravity.
Which planet is known as the Red Planet?
Mars.
Multiple Choice: Which of the following is the largest planet in our solar system? A) Earth B) Jupiter C) Saturn D) Neptune
B) Jupiter.
What is a black hole?
A region in space where the gravitational pull is so strong that nothing can escape from it.
True or False: Space is completely empty.
False.
Fill in the blank: The observable universe is about ______ billion light-years in diameter.
93.
What phenomenon explains the expansion of the universe?
The Big Bang Theory.
Multiple Choice: What is the main component of stars? A) Water B) Hydrogen C) Iron D) Oxygen
B) Hydrogen.
What is the term for the path that a celestial object follows in space?
Orbit.
True or False: The Milky Way is the only galaxy in the universe.
False.
Fill in the blank: The nearest star to Earth is ______.
Proxima Centauri.
What is the effect of gravity on time, according to Einstein’s theory?
Time runs slower in stronger gravitational fields.
Multiple Choice: What is the primary cause of seasons on Earth? A) Earth’s distance from the sun B) Earth’s axial tilt C) Moon phases D) Solar flares
B) Earth’s axial tilt.
What is dark matter?
A form of matter that does not emit light or energy, detectable only through its gravitational effects.
True or False: A comet is a small celestial body made of ice and dust that orbits the sun.
True.
Fill in the blank: The Hubble Space Telescope is primarily used for ______.
Astronomical observations.
What is the term for the study of celestial bodies and the universe as a whole?
Astronomy.
Multiple Choice: Which force is responsible for the formation of stars? A) Electromagnetic force B) Strong nuclear force C) Gravitational force D) Weak nuclear force
C) Gravitational force.
What is the event horizon of a black hole?
The boundary beyond which nothing can escape the gravitational pull of the black hole.
True or False: The universe is contracting.
False.
Fill in the blank: The process by which stars produce energy is called ______.
Nuclear fusion.
What is the term for a group of stars, gas, and dust bound together by gravity?
Galaxy.
Multiple Choice: What is the main component of the universe? A) Dark energy B) Dark matter C) Ordinary matter D) All of the above
D) All of the above.
