# Applied Sciences

Harold Washington College, Chicago

Astronomy 201: Descriptive Astronomy

Exam 1- Spring 2019 ______________________________________________________________________________________________________

Instructions

The exam consists of 50 questions (Multiple Choice, True/False and Matching questions), 2 points per each question. In addition, this exam consists of 3 additional questions for extra credit.

Try all the questions and make your best effort. Good luck! ___________________________________________________________________________________________________________

Formulas

Kepler’s third law: p2 = a3 Weight = m g

Newton’s second Law of motions: F= ma Momentum = m v

Angular momentum = m × v × r

Newton’s Universal Law of Gravity: Fg = G M1 M2

d2

Newton’s version of Kepler’s third law: p2 = 2

G(M1 + M2) × a3

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MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

1) Copernicus put the Sun in the center, but his model was not very accurate because the orbits were perfect circles.

A) True B) False

2) The reason for seasons on Earth is NOT the axis tilt. A) True B) False

3) On the moon your weight is less; your mass is the same. A) False B) True

Descriptive Astronomy 201 B Exam 1- Spring 2019

4) According to astronomers, our solar system is 14 billion years old. A) True B) False

5) Stars seen from Earth appear to circle North Star “Polaris” are called circumpolar stars. A) True B) False

6) In Modern Astronomy, a constellation is a pattern of bright stars in the night sky. A) False B) True

7) Which of the following statements is not one of Newton’s Laws of Motion? A) For any force, there is always an equal and opposite reaction force. B) An object moves with a constant velocity, if the net force is zero. C) What goes up must come down. D) Net force = mass of the object × acceleration of the object.

.

8) Suppose you drop a feather and a bowling ball on the Moon from the same height at the same time. What will happen?

A) They will float in space because of the lack of gravity on the Moon. B) The feather will float and hammer will will hit the ground. C) The hammer will hit the ground first. D) The feather will hit the ground first. E) They both will hit the ground at the same time.

9) What makes the North Star, Polaris, special? A) It appears very near the north celestial pole. B) It is the brightest star in the sky. C) It is the star directly on your northern horizon. D) It is the star straight overhead. E) It can be used to determine your longitude on Earth.

MATCHING. Choose the item in column 2 that best matches each item in column 1.

For Questions 10 and 11, Where did the following elements form?

10) Hydrogen and most of helium form

11) Most of the materials (C, O, N, Si… etc) that makes up the Earth, all life on Earth, including humans, were formed

A) inside the early generation of stars

B) inside the center of the galaxies

C) inside dwarft planets

D) in the Big Bang

E) inside the Sun

Descriptive Astronomy 201 B Exam 1- Spring 2019

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

12) What do astronomers mean by the Big Bang? A) The event which the expansion began B) The explosion of a massive star at the end of its life C) The event that marked the birth of our Solar system D) A gigantic explosion in the universe E) The event that marked the birth of our Miky Way Galaxy

13) The diagram below shows the Earth in its orbit around the Sun. Positions A, B, C and D represent the location of Earth at the begining of each season . At which position of Earth does Chicago experience the first day of winter?

A) Position A B) Position B C) Position c D) Position D

14) Why is it summer in the Northern Hemisphere when it is winter in the Southern Hemisphere? A) The Northern Hemisphere is tilted away from the Sun and receives more indirect sunlight. B) The Northern Hemisphere is tilted toward the Sun and receives more direct sunlight. C) Due to Earth’s tilt, the Northern Hemisphere is closer to the Sun than the Southern Hemisphere. D) It isn’t; both hemispheres have the same seasons at the same time. Summer comes when Earth is nearest

the Sun.

MATCHING. Choose the item in column 2 that best matches each item in column 1.

For Questions 15 and 16, What is the best explaination for the changes in the night sky?

15) Orion is visible to an observer in Illinois state on winter evenings but not on summer evenings.

16) Everyday, we see the Moon and stars rise in the east and set in the west.

A) Day light saving time

B) The location of Earth in its orbit

C) The Earth’s axis tilt

D) The Earth’s rotation on its axis

E) The Earth’s precession

Descriptive Astronomy 201 B Exam 1- Spring 2019

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

17) Which of the following conditions must exist for a lunar eclipse to occur? A) The only condition is that the phase of the Moon must be full. B) Moon phase is full, and the Moon is passing through the Earth’s orbital plane. C) The only condition is that the Earth must orbit the Moon. D) Moon phase is new, and the Moon is passing through the Earth’s orbital plane. E) The only condition is that the phase of the Moon must be new.

18) Which of the following observation was not usd for practical purpose by early cultures? A) Sun rise and sun set B) Shadows cast by sticks or structures C) Orientation of the crescent moon relative to the horizon. D) Lunar cycle E) Motion of distant galaxies

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