Question

Science Unit PreTest

Answer 1

@JustSaiyan yo man lets go

Answer 2

Which kinds of lenses are in a light microscope?

a concave objective lens and a convex eyepiece lens
a convex objective lens and a concave eyepiece lens
concave objective and eyepiece lenses
convex objective and eyepiece lenses

Answer 3

B or A.

Answer 4

I put B

Answer 5

Which property of the coating on fiber-optic strands makes light visible only at the ends of the strands?

reflectivity
absorbency
transparency
translucency

Answer 6

Hmm.. I think reflectivity. Absorption wouldn't provide light.

Answer 7

Zach listed the process of how laser beams are produced with crystals.

1A flashlamp pumps energy through the crystal.
2Atoms in the crystal absorb and then release some of the energy as light.
3Light bounces off mirrors and occasionally bounces off crystal atoms, increasing in energy.
4Some light escapes the tube through the highly reflective mirror, forming a concentrated beam.

Which best describes Zach’s error?

The crystal pumps energy through the flashlamp; the flashlamp does not pump energy through the crystal.
The atoms in the crystal do not release energy; they only absorb energy.
Light does not bounce off mirrors; it focuses through glass lenses.
Light escapes through the partially reflective mirror, not the highly reflective mirror.

Answer 8

I would say three. It would just be the same size if it was simply reflected.

Answer 9

So its C

Answer 10

Yes.

Answer 11

Which are uses of lasers? Check all that apply.

scanning a bar code on a price tag for a shirt
creating a magnified image of the moon
cutting an iron bar into two pieces
reshaping a cornea to improve vision
making a leaf appear larger so its veins are visible
its 1 and 4 but is there anymore

Answer 12

A
C
D

Answer 13

Which types of electromagnetic waves have wavelengths that are longer than those of visible light but shorter than those of microwaves?

gamma rays
X-rays
infrared light
radio waves

Answer 14

Xrays right?

Answer 15

Radio waves.

Answer 16

Which part of the electromagnetic spectrum is nearest to X-rays?

microwaves
infrared light
gamma rays
radio waves
A or B

Answer 17

Gamma rays.

Answer 18

Bees can see into the ultraviolet region of the electromagnetic spectrum. Compared with humans, bees can sense electromagnetic waves that have

a lower frequency and a shorter wavelength.
a higher frequency and a longer wavelength.
a lower frequency and a longer wavelength.
a higher frequency and a shorter wavelength.

Answer 19

C Lower frequency and longer wavelength

Answer 20

Jin has four colorful glass bottles on his windowsill. One is red, one is violet, one is green, and one is yellow. The light that passes through which bottle has the lowest frequency?

red
violet
green
yellow

Green or yellow

Answer 21

Red is the lowest.

Answer 22

thinking of the wrong thing

Answer 23

Which of these most directly affects what happens to white light when it hits an object?

the properties of the object
the source of the light
the speed at which the light travels
the distance of the object from the light

Answer 24

A. It will depend on it's color, transparency, etc.

Answer 25

Donna shines a flashlight and a laser pointer on a sheet of paper. She holds each device at an equal distance from the paper. How does the light hitting the paper from each device appear different?

The light from the flashlight lights up a larger area of the paper.
The light from the laser pointer lights up a larger area of the paper.
The light from the flashlight magnifies a larger area of the paper.
The light from the laser pointer magnifies a larger area of the paper.

Answer 26

@JustSaiyan help please

Answer 27

@Vocaloid

Answer 28

Donna shines a flashlight and a laser pointer on a sheet of paper. She holds each device at an equal distance from the paper. How does the light hitting the paper from each device appear different?

The light from the flashlight lights up a larger area of the paper.
The light from the laser pointer lights up a larger area of the paper.
The light from the flashlight magnifies a larger area of the paper.
The light from the laser pointer magnifies a larger area of the paper.