Physical Science Test 7

Front 1

true or False

A mechanical wave is a disturbance that travels through a medium carrying energy from one location to another.

Back 1

True

Front 2

True or False

Reflection changes the speed or frequency of a wave.

Back 2

False

Front 3

True or False

Electromagnetic waves cannot travel through matter but do travel through a vacuum

Back 3

False

Front 4

Visible light is a large part of the entire electromagnetic spectrum

Back 4

False

Front 5

True or false

all radio waves are used for communication puposes

Back 5

False

Front 6

ultraviolet light can be beneficial or hazardous to human skin depending on exposure.

Back 6

True

Front 7

Shorter wavelengths of light refract more than longer wavelengths of light when white light passes through a prism.

Back 7

True

Front 8

Flashlights and car headlights often use concave mirrors to direct a beam of light

Back 8

True

Front 9

The speed of light depends on the medium through which the light passes.

Back 9

True

Front 10

Fiber optics is an application of the phenomenon of refraction.

Back 10

False

Front 11

Refracting telescopes use convex lenses to collect and focus light from distant objects.

Back 11

True

Front 12

True or False Correct the bold word if false

Frequency is measured in cycles per second, also called hertz

Back 12

True

Front 13

True or False Correct the bold word if false

The more energy a wave has, the lesser its amplitude is.

Back 13

False - GREATER

Front 14

True or False Correct the bold word if false

Sound intensity is measured in decibels

Back 14

True

Front 15

True or False Correct the bold word if false

As a wave enters a medium at an angle, it is reflected because one side of the wave moves more slowly than the other side.

Back 15

False - Refracted

Front 16

True or False Correct the bold word if false

A wave will diffract more if its wavelength is small compared to the size of an opening or obstacle

Back 16

False - LARGE

Front 17

True or False Correct the bold word if false

The speed of light in a vacuum is

3.00 x 108 kilometers per second

Back 17

False - meters

Front 18

The intensity of light increases when the distance from the light source increases

Back 18

False - DECREASES

Front 19

True or False Correct the bold word if false

Reflection of light off a rough surface is called diffuse reflection

Back 19

True

Front 20

True or False Correct the bold word if false

The primary colors of light are cyan, yellow, and magenta

Back 20

False - pigment

Front 21

True or False Correct the bold word if false

A pigment is a material that absorbs some colors of light and reflects other colors

Back 21

True

Front 22

True or False Correct the bold word if false

A material with a low index of refraction causes light to refract very little.

Back 22

True

Front 23

True or False Correct the bold word if false

A simple microscope is an instrument that uses two convex lenses to magnify very small objects that are near

Back 23

True

Front 24

True or False Correct the bold word if false

The iris is the opening of the eye that allows light to enter.

Back 24

True

Front 25

Which of these is not a kind of mechanical wave

a. surface wave

b. transverse wave

c. longitudinal wave

d. infrared wave

Back 25

d. infrared wave

Front 26

The number of complete waves that pass a fixed point in a given amount of time is the

a. amplitude

b. wavelength

c. period

d. frequency

Back 26

D. Frequency

Front 27

For waves at a constant speed, if wavelength is halved, then frequency is

a. halved

b. doubled

c. unchanged

d. quadrupled

Back 27

B. Doubled

Front 28

What is the phenomenon of a wave bouncing off a surface that it cannot pass through

a. interference

b. diffraction

c. refraction

d. reflection

Back 28

D. Reflection

Front 29

What is the rate at which a wave's energy flows through a given area?

a. frequency

b. pitch

c. intensity

d. loudness

Back 29

C. Intensity

Front 30

Electromagnetic radiation behaves as

a. waves

b. particles

c. neither waves nor particles

d. both waves and particles

Back 30

D. BOTH

Front 31

The image formed by a convex mirror is

a. a virtual image

b. upside-down and larger than the object

c. a real image

d. upright and smaller than the object

e. A and D

f. B and C

Back 31

E A and D

Front 32

The red and orange colors of sunset are due to

a. reflection

b. scattering

c. refraction

d. polarization

Back 32

B. scattering

Front 33

The process that blocks light waves in all directions except the light waves that correspond with the direction of a filter is

a. reflection

b. scattering

c. refraction

d. polarization

Back 33

D. polarization

Front 34

An orange object

a. reflects orange light

b. absorbs red and yellow light

c. absorbs orange light

d. reflects blue light

Back 34

A reflects orange light

Front 35

Which of the following statements about laser light is false?

a. Laser light is coherent light

b. laser light spreads out from its source

c. laser light can be used to measure distances precisely

d. laser light can cut through metals

Back 35

B

Front 36

Which of the following statements about LED lightbulbs is true?

a. LED bulbs use less energy than compact fluorescent s

b. LED bulbs and incandescent bulbs have similar life spans

c. LED bulbs are somewhat more expensive than compact fluorescent s.

d. A and B

e. B and C

f. A and C

Back 36

f. A and C

Front 37

What part of the eye is sensitive to color?

a. the cornea

b. the cones

c. the rods

d. the iris

Back 37

B. the cones

Front 38

What part of the ear turns mechanical vibrations to electrical pulses for the brain?

a. the eardrum

b. the pinna

c. the anvil

d. the cochlea

Back 38

d. the cochlea