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Year 9 > Phisicis > Flashcards

Phisicis Flashcards

1
Q

What is the basic unit of distance in space?

A

The meter.

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2
Q

True or False: Light travels faster in space than in air.

A

True.

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3
Q

Fill in the blank: The speed of light in a vacuum is approximately ______ kilometers per second.

A

299,792.

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4
Q

What is the name of the force that keeps planets in orbit around the sun?

A

Gravity.

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5
Q

Which planet is known as the Red Planet?

A

Mars.

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6
Q

Multiple Choice: Which of the following is the largest planet in our solar system? A) Earth B) Jupiter C) Saturn D) Neptune

A

B) Jupiter.

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7
Q

What is a black hole?

A

A region in space where the gravitational pull is so strong that nothing can escape from it.

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8
Q

True or False: Space is completely empty.

A

False.

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9
Q

Fill in the blank: The observable universe is about ______ billion light-years in diameter.

A

93.

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10
Q

What phenomenon explains the expansion of the universe?

A

The Big Bang Theory.

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11
Q

Multiple Choice: What is the main component of stars? A) Water B) Hydrogen C) Iron D) Oxygen

A

B) Hydrogen.

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12
Q

What is the term for the path that a celestial object follows in space?

A

Orbit.

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13
Q

True or False: The Milky Way is the only galaxy in the universe.

A

False.

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14
Q

Fill in the blank: The nearest star to Earth is ______.

A

Proxima Centauri.

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15
Q

What is the effect of gravity on time, according to Einstein’s theory?

A

Time runs slower in stronger gravitational fields.

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16
Q

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

A

B) Earth’s axial tilt.

17
Q

What is dark matter?

A

A form of matter that does not emit light or energy, detectable only through its gravitational effects.

18
Q

True or False: A comet is a small celestial body made of ice and dust that orbits the sun.

A

True.

19
Q

Fill in the blank: The Hubble Space Telescope is primarily used for ______.

A

Astronomical observations.

20
Q

What is the term for the study of celestial bodies and the universe as a whole?

A

Astronomy.

21
Q

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

A

C) Gravitational force.

22
Q

What is the event horizon of a black hole?

A

The boundary beyond which nothing can escape the gravitational pull of the black hole.

23
Q

True or False: The universe is contracting.

A

False.

24
Q

Fill in the blank: The process by which stars produce energy is called ______.

A

Nuclear fusion.

25
Q

What is the term for a group of stars, gas, and dust bound together by gravity?

A

Galaxy.

26
Q

Multiple Choice: What is the main component of the universe? A) Dark energy B) Dark matter C) Ordinary matter D) All of the above

A

D) All of the above.

Year 9 (7 decks)

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