Worksheetsrevision year 7 (2nd term)
Total questions: 65
Worksheet time: 1hrs 7mins
A dichotomous key is a series of …., grouped into pairs, designed to identify an organism by its… . Which word is most appropiate to replace the FIRST blank?
descriptions
taxonomic ranks
organisms
identification
A child finds an organism that has no wings, no shell, and 8 legs. Using this dichotomous key, determine which organism it most likely to be… .
butterfly
snail
spider
worm
An illustration of an organism and a dichotomous key are given. What is the organism?
arachnid
dragonfly
fruit fly
may fly
A student uses this diagram to understand the parts of a fish. The student then uses an identification key to classify different types of fish.
Based on the key, which of these fish is most likely a bluegill?
A student examines the winged insect using the picture.
Based on the key, in what order should this insect be classified?
Mantodea
Raphidioptera
Coleoptera
Lepidoptera
Students collected leaf samples. The students used the leaf identification key below to identify a leaf sample.
Based on the identification key, which type of tree is this sample from?
Ginkgo
Honey locust
Horse Chestnut
Black Maple
State the taste of this fruit?
Tastles
Bitter
Sour
Sweet
What is the example of alkaline substance
bitter gourd
lemon juice
cooking oil
mineral water
Which of the properties of alkaline substance is NOT TRUE?
taste bitter
slippery
turn red litmus paper to blue
turn blue litmus paper to red
The color of litmus in neutral solution:
Red
Blue
Purple
Green
produce hydroxide ions (OH-) ions
Acid
Base
An alkaline material will have a pH of
<7
>7
=7
An acidic material will have a pH of
<7
>7
=7
If a material has more OH- ions, then it is a(n)
Acid
Alkaline
Neutral
If a material has an equal amount of H+ and OH- ions, then it is a(n)
Acid
Alkaline
Neutral
Acid rain has a pH of 4. Is acid rain a stronger or weaker acid than the substance in the image?
Stronger
Weaker
It is a base
Here is the results of a pH test of vinegar. Is this substance acidic, alkaline, or neutral?
Acidic
Alkaline
Neutral
Here are the pH results of hand soap. Is this substance acidic, alkaline or neutral?
Acidic
Alkaline
Neutral
How many part of gold is in 18 carat gold
18 th part
41 part
32 part
Why silver is not used in electrical fittings
Very expensive
Bad conductor of electricity
Lack of silver
Why we apply bronze over copper for making statues
Bronze is harder than copper
Bronze is more ductile and malleable than copper
None of the above
Which of the following absorbs high heat energy?
Which of the following elements can be shaped easily?
Carbon
Gold
Sulpur
Iodine
What are the properties best describe the following pictures?
Good heat conductor
Low heat conductor
Good electric conductor
Poor electric conductor
Which of the following physical properties best describe the element in this picture
Dull
Gray
Shiny
Black
All elements are metal
True
False
Which of the following is not a property of a metal?
Lustrous
Ductile
Brittle
Dense
What is an alloy
A mixture of metals and gas
A mixture of carbon and steel
A homogenus mixture of metals and non metals
mixture of metals and non metals
Brass is an alloy made of
copper and zinc
copper and tin
copper and nickel
copper and aluminum
Pure iron is _________________ .
soft and weak
hard and stong
bendy and brittle
In a pure metal, the particles are arranged in (a) .
What is the name of the original Supercontinent?
Florida
Pangaea
Asia
Equator
What causes an echo?
sound waves bouncing off large, hard surfaces
sound waves bouncing off carpet
sound waves bouncing off inside a cloth shop
you repeating yourself
Sara and Maria made a telephone using two cups and a string. It was a very long string. Maria went upstairs in her house and Sara stayed downstairs. Maria spoke softly into the can. "I can hear you!" Sara said back. How can this happen?
Sound waves travel through a vacuum.
Sound waves travel through solids like the string.
Sound waves travel from high to low.
Maria talked so loudly that Sara could hear her without the phone.
Fishermen use a depth finder to send ultrasonic waves into the water. The time it takes for sound waves to return helps them determine where to fish. Which property of sound reveals the location?
frequency
intensity
pitch
reflection
Why do sound echo in an empty gym?
Sound has nowhere to go
There are hard surfaces so sound reflects
Sound travels in waves
Sound is unpredictable
A man stood 680 m from a cliff and shouted. How long after shouting does this person hear the echo back? Let the speed of sound in air be 340 m/s.
2s
1s
4s
6s
People often use the reflection of ultrasound to determine the depth of the sea. Assume the ship emits a sonar and picks up its reflection from the seabed after 1 second. Calculate the approximate depth of the seabed, knowing the speed of ultrasonic propagation in water is 1500 m/s.
1500m
750m
500m
1000m
