Question

Multiple Choice Identify the choice that best completes the statement or a wer the question 1. One of the nearest stars is Alpha Centauri, whose distance is 4.4 light-years. The time it takes light to travel from Alpha Centauri to us is a 1.25 seconds b. 8.3 minutes c. 4.4 years. d. 600 years. 2. Which of the following is false? a The Local Group is a member of the Laniakea Supercluster, which contains thousands of galaxies. b. The Local Group contains two large spiral galaxies and a few dozen dwarf galaxies. c. Our Solar System has eight classical planets. d. The Milky Way Galaxy contains approximately 100 million stars, e. The Laniakea Supercluster is one of many superclusters in the universe. 3. If the diameter of the Milky Way is approximately 100,000 light-years, then our galaxy is - times larger than our Solar System. For reference, Pluto's orbit has an approximate diameter of 80 astronomical units (AU) a. 100 b. 1.000 c. 10,000 d. 10° e. 10° Which of the following is false? a. A scientific theory is an undisputed fact. b. If continual testing of a hypothesis shows it to be valid, it may become an accepted theory. c. A hypothesis must always have one or more estable predictions d. A scientific theory may eventually be proven wrong when scientists acquire new data. e. Scientific observations are used to test a hypothesis. 5. Leap years occur because a. Earth's orbital period around the Sun is decreasing. b. Earth's orbital period is 365.24 days. c. the Gregorian calendar contains only 11 months d. Earth speeds up in its orbit when it comes closest to the Sun. e. a calendar month is not the same as a lunar month

Answer 1

Solution:

1.)

Ans:C 4.4 years

Reason: Light year is a unit of distance, 1 light year $\Rightarrow$ light travelling in 1 year, for a distance of 4.4 light year it requires 4.4 year to reach.

2.)

Ans: D is false,

Reason: The Milky Way is a barred spiral galaxy with a diameter between 150,000 and 200,000 light-years (ly). It is estimated to contain 100–400 billion stars and more than 100 billion planets.

3.)

Ans: E 10⁸.

Reason: The diameter of the Milky way varies although for the most part is ~ 100,000 light years. Therefore, the diameter of the Milky way is roughly 160,256,410 times as wide as the solar system.

4.)

Ans: A ,

Reason:Every scientific theory starts as a hypothesis. A scientific theory is a hypothesis for suggesting a solution for an unexplained occurrence that doesn't fit into a currently accepted scientific theory. it becomes a fact when its experimentally proven, until then its just a hypothesis.

5.)

Ans: B

Reason: Its a fact that, the Earth's orbital period is 365.24 days.

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Answer 2

Number 2 is false.