Unit 1 ScienceTest Review

Look at the picture. What is true?

• Earth's gravity is pulling down on Skydiver A, but not Skydiver B

• Earth's gravity is pulling down the skydivers, but not the plane.

• Earth's gravity is pulling down on Skydiver A, and pushing up on Skydiver B

• Earth's gravity is pulling down on Skydiver A, Skydiver B, and the plane

What is one factor that affects the strength of gravity’s pull on an object?

• how fast an object is rotating

• the apparent motion of an object across the sky

• the size of an object

• the speed of revolution of one object around another

Why do nighttime stars appear to be so small? Choose the best answer.

• they are small

• human eyes are not powerful enough to see stars

• stars outside of our solar system are very, very far away from Earth

• only the light of stars exists, not the star

What can be said about all stars in the universe?

• all stars are spheres.

• all stars are hot, burning balls of gases that give us light and heat energy

• some stars are spheres while far away stars are star-shaped

• both answers a and b

Mrs. Dobias is keeping a journal of the phases of the moon. She observes a full moon on day 1. Which phase would you expect Mrs. Dobias to observe 29 days later?

• full moon

• new moon

• crescent moon

• half moon

Which statement best explains why the moon goes through phases over the course of a month?

• the Moon’s revolution around the Earth

• the Moon’s revolution around the Sun

• phases are caused by Earth’s rotation on its axis

• gravity between the Earth and the Moon causes phases

Ms. Hawley watched the birds at the feeder. She observed the length of the bird feeder’s shadow changing throughout the day. What caused the length of the feeder’s shadow to change?

• the revolution of the Earth around the Sun

• the Moon’s revolution around the Sun

• the Sun moves across the sky while the Earth remains motionless.

• the rotation of the Earth on its axis

Mrs. Paiva observed the constellation Orion shining in the dark winter sky. She could not see the constellation during the summer nights. Which statement explains Mrs. Paiva's observation?

• constellations revolve around the Sun

• the Earth revolves around the Sun

• constellations rotate around the Sun

• Earth is tilted and rotates on its axis

Look at the table below. What pattern does the data show?

• the number of daylight hours decreases from January to March

• the number of daylight hours increases from January to March

• the numbers of hours of sunlight increases from June to August

• the number of daylight hours increases from October to December

What are you seeing when a full moon is visible?

• the whole lighted side of the Moon

• the whole dark side of the Moon

• part of the lighted half and part of the dark half of the Moon

• . a new Moon