WorksheetsG8 - SA1 Review
Total questions: 66
Worksheet time: 39mins
What is the SI unit of distance and the symbol?
centimeter, cm
millimeter, mm
decimeter, dm
meter, m
The process in which a gas is direcetly converted to solid state is called?
deposition
sublimation
melting
condensation
The process in which a gas is converted into liquid
sublimation
melting
filtration
condensation
When a boat is leaving the dock, passengers on the boat see the dock moving away, while people on the dock see the boat moving away. What are the reference objects for the passengers and the people on the dock, respectively?
boat, dock
dock, boat
boat, boat
dock, dock
In a car traveling at constant speed on a straight road, the driver looks at a tree outside and feels the tree is moving backward, while a person standing near the tree sees the car moving forward. What are the reference objects for the driver and the person by the tree, respectively?
Car, ground
Ground, car
Car, car
Ground, ground
Which of the following correctly pairs a phenomenon with its phase change?
Morning dew forming on grass – Solidification
A puddle disappearing on a sunny day – Sublimation
Fog forming in the early morning – Condensation
Wet clothes freezing on a winter line – Vaporization
During which of the following processes does the temperature of water remain constant while heat is being released?
Liquid water warming from 10°C to 50°C
Water vapor condensing into liquid water
Ice warming from -10°C to 0°C
Liquid water boiling to become steam
In hot summer, to prevent food from spoiling, which statement is correct?
Put dry ice on transport vehicles; dry ice evaporates and absorbs heat to cool food.
Place ingredients on ice; ice melts and absorbs heat to cool ingredients.
Cover food box with wet towel; water sublimates and absorbs heat
Put food in fridge; refrigerant condenses and absorbs heat to lower temperature
Why can a driver see the road at night when the car's headlights are on?
The road glows in the dark.
The road acts like a mirror, bouncing light straight back.
The rough road scatters the headlight beams in many directions.
The car's windows make things brighter.
Why does a pencil look bent when you put it in a glass of water?
The pencil is actually bending.
The water magnifies it.
The light bends when it leaves the water, tricking your eyes.
The water reflects the pencil.
Why does a red apple look red in white light, but dark under a blue or green light?
The apple gives off red light.
The apple soaks up red light.
A red apple bounces back red light and soaks up other colors.
The color of the light changes the apple's color.
Which of the following is a common source of infrared radiation?
A fluorescent light bulb
The sun
A remote control
Both B and C
Why do doctors and nurses sometimes use ultraviolet (UV) light in hospitals?
To keep patients warm
To sterilize equipment by killing germs
To help patients see better
To cook food
What type of ray from the sun causes sunburn?
Visible light
Infrared rays
Ultraviolet rays
X-rays
Why is it important to wear sunscreen on a sunny day?
It keeps you warm.
It blocks most ultraviolet rays from damaging your skin.
It helps you see infrared light.
It makes you sweat less.
A car travels at a constant speed of 60 km/h for 3 hours. How far does it travel?
20 km
180 km
63 km
57 km
Walking at 5 km/h, how far can you walk in 45 minutes?
3.75 km
5 km
4.5 km
2.25 km
Why do you see lightning before you hear thunder during a storm?
Light travels slower than sound.
Light travels much faster than sound.
Thunder happens before lightning.
Sound doesn't travel through air.
If you shout at a distant mountain and hear your echo 4 seconds later, about how far away is the mountain? (Speed of sound ≈ 340 m/s)
85 m
340 m
680 m
1360 m
In which medium does sound travel fastest?
Air
Water
A metal rail
Outer space (vacuum)
What is the correct formula for calculating speed?
s=vxt
v=s/t
s=t/v
v=s/t
What is the best definition of a "reference point" in physics?
The exact center of an object’s motion
A place or object used for comparison to tell if another object is moving
The point where an object starts its journey
A specific time at which speed is measured
Which statement correctly describes the law of reflection?
Light travels slower when it reflects off smooth surfaces.
The angle at which light hits a surface is smaller than the angle at which it reflects.
The angle of incidence is equal to the angle of reflection, and both rays lie in the same plane.
Reflection only occurs if the surface is completely flat and shiny.
Xiaoli is studying how string length affects pitch. She uses a guitar string stretched over a box, pressing it at different positions. To see how length affects pitch, she should change ______ and then observe ______ after plucking with the same force.
Length of the vibrating string
Thickness of the string
How fast the string vibrates
Loudness of the sound
In an experiment with a tuning fork, Min hits a tuning fork and lowers it slowly toward the surface of water in a beaker. Splashing happens when the fork touches the water. If Min uses a tuning fork that vibrates faster, she should compare ______ and listen for changes in ______.
The size of the tuning fork
How fast the tuning fork vibrates
The height water splashes
The pitch of the sound produced
Tao wants to test how tension affects the pitch of a string sound. He tightens a guitar string by turning the tuning peg. In this experiment, he changes ______ and should carefully observe ______ and listen for changes in ______.
Tightness (tension) of the string
Material of the string
Vibration frequency of the string
Pitch of the sound
During a thunderstorm, Maria sees a flash of lightning and hears the thunder 6 seconds later. If the speed of sound in air is 340 m/s, approximately how far away was the lightning?
340 m
680 m
1020 m
2040 m
If a lightning strike is 1.7 kilometers away, how long after seeing the flash will you hear the thunder? (Speed of sound = 340 m/s)
1 second
3 seconds
5 seconds
7 seconds
A group of students are trying to estimate the distance to a cliff by making an echo. One student shouts and hears the echo 3 seconds later. How far away is the cliff? (Speed of sound = 340 m/s)
170 m
340 m
510 m
680 m
From the words below, which of the following influences the pitch of sound?
frequency
amplitude
timbre
loudness
sound is produced by (a) and its propagation requires a medium
What is the speed of soun in air?
3400 m/s
340 m/s
34 m/s
3.4 m/s
Which of the followinf is the hearing range of human?
16 Hz to 12000 Hz
2000 Hz to 110000Hz
35 Hz to 25000 Hz
20 Hz to 20000 Hz
The pitch of a guitar string is higher when it is tight than when it is loose, so the loose string will produce a sound that is ______than the tight string.
The amplitude must be greater
The amplitude must be smaller
Must have a lower frequency
Must vibrate more times per second
A tuba player plays a loud note on her tube. She then plays a quiet note of the same pitch. Which property of the sound wave she produced has changed?
frequency
wavelength
amplitude
speed
A loud sound has a large (a)
A student listens to two sounds. The sound with the higher frequency has a higher (a)
Compared with a high pitched sound, a low pitched sound always has a smaller (a)
que sound quality of an instrument, which allows us to tell a piano from a violin is called _____
frequency
amplitude
timbre
wavelength
Which of the pairs influence each other
amplitude, pitch
frequency, timbre
pitch, frequency
loudness, amplitude
timbre, material
Define amplitude
how high or low a soind seems to you
the size of the vibration. how big the energy wave
how much energy a sound has. how soft or strong a sound seems
unique "colour" or "texture" of a sound that makes it special
Define frequency
how high ot low a sound seems to you
the size of a vibration. tells us how big the energy wave is
how fast something vibrates back and forth
the characteristic of a sound that allows us to distinguish between different sources
the matter that a sound wave or light ray thravels through.
solid
liquid
medium
gas
sound (a) travel without a medium
Which unit measures frequency?
decibel
hertz
watts
joule
Which is the correct tool to use to measure the temperature of an ice bath?
meter stick
scale
thermometer
caliper
Sound cannot travel in vacuum because it needs particles to (a) into.
which of the following tools is used to measure the length of a cell phone accurately?
scale
ruler
meter stick
beaker
(a) mirror has a diverging effect on light rays.
Which of the following are types of concave mirrors?
rear-view mirror
car headlight
mirrors for hte road
security mirrors
Which of the following is correct about concave and convext mirrors?
Convex mirror canbe used to make flashlight
Convex mirrors causes mirrors to converge
Concave mirror causes light to converge
Concave mirror can expand the field of view
Which of the following is not a characteristic of an image of a plane mirror?
Virtual image
Inverted image
Image of the object is the same size
Real image
light that the human eye cannot see is called (a) light
Sunlight is white light. When it passes through a prism, it splits into light of various colours. TRhis phenomenon is called______
the spectrum of light
dispersion of light
refraction of light
reflection of light
Which colour of visible light ray has the longest wavelength and the weakest energy?
red
violet
indigo
orange
A high frequency note is played on a violin. The violinist then reduces the
frequency of the note. What change in the note do the audience hear?
pitch decreases
volume increases
pitch increases
volume decreases
The pitch of a guitar string is higher when it is tight than when it is loose, so the loose string will produce a sound that is ______than the tight string.
The amplitude must be smaller
Must vibrate more times per second
The amplitude must be greater
Must have a lower frequency
In a soundwave, what does the height measure?
peak
amplitude
frequency
wavelength
A plane mirror OP is placed horizontally. An incident ray makes an angle of 60° with the mirror surface (measured from the mirror, not from the normal).
120°
60°
30°
90°
If the incident ray direction is reversed (sent back along the original reflected path), the new reflected ray will
make 90° with the mirror
travel along the original incident direction
make 120° with the mirror
be absorbed by the mirror
A submarine emits a sonar wave, which returns from an underwater cliff in 1.02s. If the speed of sound in salt water is 1531 m/s, how far away is the cliff?
780.81 m
1561.62 m
78.81 m
1500.98 m
A student lightly taps and then heavily strikes the same drumhead once each. The two sounds produced differ in ___
pitch
frequency
timbre
loudness
White paper on a table, plane mirror on paper, flashlight shining from above, observer views from the side. When viewed from the side, which object appears brighter?
mirror
white paper
both equally
flashlight bulb
Bubbles getting bigger as they rise from the bottom is ______
before boiling
water is boiling
water evaporating
liquid is boiling, even if heating continues, its temperature _________
increases
remains constant
decreases
Which of the following are light sources?
moon
sun
fire
cup of water
