Science Review 3-6-17

What causes sound?

• something vibrating
• a part of the ear
• an object moving through the air
• light energy

What material does sound travel through fastest?

• air
• outer space
• water
• a brick

Suppose that a violin string makes sound waves that are close together.  The sound waves do not have a lot of energy.  What kind of sound will you hear?

• a loud sound with a low pitch
• a loud sound with a high pitch
• a soft sound with a low pitch
• a soft sound with a high pitch

Sharon needs eyeglasses to help her see things that are close to her clearly.  Which should be used to make her glasses?

• concave lenses
• mirrors
• convex lenses
• prisms

The bouncing of light off a surface is called

• reflection
• refraction
• absorption
• transformation

An opaque material

• changes light into electrical energy
• lets light pass straight through it
• scatters light that passes through it
•  blocks light from passing through it

A concave lens MOSTLY changes

• light's color
• light's direction
• sound's volume
• sound's speed

Layla bounces a basketball in a gym.  Why does she hear a sound each time the ball hits the floor?

• The ball makes the floor warmer.
• The ball makes the floor vibrate.
• The floor pushes the ball up in the air.
• Sound waves bounce off the floor.

When an object moves back and forth very fast, it

• makes sound
• gives off light
• loses mass
• changes state

Which of these is the BEST definition of the word ecosystem?

• all the living and nonliving things in an area
• all the nonliving things in an area
• all the living things in an area
• the place where an organism lives