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Yr 9 JE Revision 20-21

Total questions: 103

Worksheet time: 1hrs 17mins

Name
Class
Date
1.
What is a substance called if it speeds up a chemical reaction?
a)
reusable
b)
catalyst
c)
specific
d)
fragile
2.
With what 3 letters do enzymes typically end?
a)
-ose
b)
-ase
c)
-ese
d)
-tic
3.
Which of the following conclusions can be drawn from this graph?
a)
The optimum pH of the enzyme is 6.6.
b)
The optimum pH of the enzyme is 5.8
c)
The enzyme’s activity increases as pH increases 5.0 to 9.0
d)
The enzyme’s activity is greater around pH of 8.0 .
4.
An enzyme speeds up a chemical reaction in the cell but can only be used once.  True or False? 
a)
true
b)
false
5.
What is the function of an enzyme?
a)
enzymes break themselves into small pieces
b)
enzymes slow down chemical reactions
c)
enzymes speed up chemical reactions
d)
enzymes combine products to form reactants 
6.
What happens when enzymes are heated to a high temperature?
a)
The enzymes die.
b)
The shapes of the enzyme are altered denature
c)
The enzymes' amino acid sequence changes.
d)
The enzymes remain the same
7.
Which of these is most likely an enzyme?  
a)
Sucrose
b)
Galactose
c)
Fructose
d)
Amylase
8.
What is a substance called if it speeds up a chemical reaction?
a)
reusable
b)
catalyst
c)
specific
d)
fragile
9.

Enzymes are an example of

a)

Lipids

b)

Carbohydrate

c)

Protein

d)

Nucleic Acid

10.
Illegal drugs are dangerous to your health. What do you think are some other common features of illegal drugs? 
a)
a.  affects function of brain
b)
b.  can result in drug dependence and addiction
c)
c.  can improve focus and concentration
d)
a.  both A and B
11.
Place the following in the correct order of the pathway of addiction.
a)
drug use, dependence, tolerance, addiction
b)
dependence, tolerance, drug use, addiction
c)
drug use, tolerance, dependence, addiction
d)
drug use, dependence, addiction, tolerance
12.
Identify the negative effect(s) alcohol can have on a family.
a)
violence
b)
unpredictable behavior
c)
children are often neglected
d)
all of these
13.
It is well known that tobacco contains carcinogens.  Carcinogens are a major risk factor for which disease?
a)
HIV
b)
Cancer
c)
Diabetes
d)
common cold
14.
Identify the organ that is damaged the most by excessive alcohol use.
a)
stomach
b)
brain
c)
liver
d)
heart
15.

A student tried Xanax and began using it regularly. After learning in health class that long term effects of Xanax can lead to lowered heart rate, respiratory depression, brain damage, dependence, and addiction, she decided to not use the drug anymore. She started feeling anxious, having trouble sleeping, sweating excessively and lost her appetite. Which of the following terms represents these symptoms?

a)

Tolerance

b)

Dependence

c)

Addiction

d)

Withdrawal

16.

What are some effects drugs, alcohol and tobacco have on a person socially

a)

strained relationships with family and friends

b)

loss of interest in activities

c)

loss of social privileges (grounding, phone taken away, removal from sports teams, loss of drivers license)

d)

All of these

17.
How do organisms get the energy they need?
a)
Plants get energy from fertilizers and animals get energy from drinking water.
b)
Plants get energy from glucose produced in the soil, and animals get energy directly from sunlight.
c)
Plants break down the glucose they produced in photosynthesis, and animals get energy from eating other organisms.
d)
Plants do not require energy because they do not move, and animals get energy by performing exercise.
18.
Which of the following is NOT a necessary input for the process of photosynthesis?
a)
CO ₂ (carbon dioxide)
b)
Sunlight
c)
H ₂O (water)
d)
O ₂ (oxygen)
19.
Where within the cell does photosynthesis take place?
a)
the cytoplasm
b)
the chloroplasts
c)
the mitochondria
d)
the nucleus
20.
Which item listed is NOT produced in the process of cellular respiration?
a)
CO ₂  (carbon dioxide)
b)
C₆H₁₂O₆  (glucose)
c)
H₂O (water)
d)
Energy in the form of ATP
21.
In what way is photosynthesis and respiration related to each other?
a)
The reactants of photosynthesis are the reactants of respiration.
b)
The products of photosynthesis are the reactants of respiration.
c)
The products of photosynthesis are the products of respiration.
22.
In photosynthesis, how is chemical energy stored?
a)
ATP
b)
Glucose
c)
Oxygen
d)
Carbon Dioxide
23.
In respiration, how is chemical energy stored?
a)
ATP
b)
Glucose
c)
Oxygen
d)
Carbon Dioxide
24.
What do animals do with the carbon dioxide produced in their cells during cellular respiration?
a)
store it for later use
b)
reuse it during photosynthesis
c)
exhale it in the breathing process
d)
combine it with water to make sugar
25.
The following diagram shows the relationship between photosynthesis and respiration.  What products of photosynthesis are starting material for cellular respiration?
a)
glucose and oxygen
b)
heat energy and ATP
c)
carbon dioxide and water
d)
light energy and chlorophyll
26.
Which of the following shows a balanced chemical equation for cellular respiration?
a)
6CO₂  + 6H₂O + Solar Energy      →          C₆H₁₂O₆  + 6O₂
b)
3CO₂  + 3H₂O + Solar Energy      →          3C₆H₁₂O₆ + 3O₂
c)
C₆H₁₂O₆ + O₂         →             CO₂   +  H₂O  + ATP
d)
C₆H₁₂O₆  + 6O₂         →          6CO₂  +  6H₂O + ATP
27.

Which of the following organisms is a producer?

a)

grass

b)

rabbit

c)

fox

d)

snake

28.

Which of the following organisms is a primary consumer?

a)

grass

b)

rabbit

c)

fox

d)

snake

29.

Which of the following organisms uses photosynthesis to get the energy it needs to survive?

a)

grass

b)

rabbit

c)

fox

d)

snake

30.

Which of the following organisms in competition with the weasel for their food source?

a)

grass

b)

rabbit

c)

fox

d)

snake

31.

What would happen to the rabbit population if the fox population moved out of the area represented by the food web?

a)

The rabbit population would increase

b)

The rabbit population would decrease

c)

The rabbit population would neither increase nor decrease

32.
A consumer that hunts is called:
a)
a producer.
b)
an omnivore.
c)
a predator.
d)
a herbivore.
33.
A frog eats a fly. The frog and fly are demonstrating ________.
a)
mutualism
b)
competition
c)
predator/prey
d)
parasitism
34.
All energy on Earth ultimately comes from what source?
a)
Water
b)
Sun
c)
Consumers
d)
Oxygen
35.
An organism that needs to eat other organisms to obtain energy is known as a:
a)
Autotroph
b)
Producer
c)
Consumer
d)
Mutualist
36.
The arrows in a food chain or web represents what?
a)
They point to the organism that is being eaten.
b)
It shows how sunlight flows within an ecosystem.
c)
They show what direction the energy is flowing between organisms. 
d)
They represent how water is transferred within a habitat.
37.
What does a food web represent?
a)
All connections of energy flow throughout all organisms in a habitat.
b)
The specific ways that mutualism is carried out.
c)
A single pathway or energy flow between organisms. 
d)
How carnivores get their food. 
38.
Why might an organism have more than one arrow coming from them in a food web?
a)
More than one organism may eat them. 
b)
They may eat more than one other organism. 
c)
This organism gets its energy from multiple sources. 
d)
They have no resources available to them.
39.
Evolution typically happens...
a)
in a few weeks
b)
over millions of years
c)
never
d)
in 100 years
40.
Which of the following is NOT considered evidence of evolution?
a)
similar DNA
b)
similar development
c)
similar behavior
d)
vestigial structures
41.
If an organism can't adapt fast enough, this might happen.
a)
hibernate
b)
stay the same
c)
live longer
d)
become extinct
42.
Darwin said that the number of offspring an organism has ___________________
a)
stays the same
b)
is more than can survive
c)
is less than needed
43.
Darwin said that within a species there will be _________________________
a)
nothing different
b)
variation/differences
44.
Organisms with differences/variations that are helpful will ______________________
a)
live longer
b)
become extinct
c)
show no change
45.
What can happen to a species over time if some of the organisms have an advantage?
a)
The population will decrease
b)
The population will become extinct
c)
The population will slowly increase
46.
What is the symbol for Potassium?
a)
P
b)
K
c)
Pb
d)
Pd
47.
Which one of these is not a noble gas?
a)
Helium
b)
Radon
c)
Iodine
d)
Krypton
48.
Which one of these elements is found in electrical cord?
a)
Cu
b)
H
c)
Kr
d)
Br
49.
___________ is the only metal that is a liquid at room temperature.
a)
Platinum
b)
Water
c)
Tin
d)
Mercury
50.
What element is this?
a)
Silver
b)
Silicon
c)
Sulfur
d)
Selenium
51.
Each column in the periodic table is called a 
a)
period
b)
group
c)
cluster
d)
unit
52.
The atomic number tells you what?
a)
number of electrons
b)
number of protons
c)
number of neutrons
d)
both electrons and protons in an atom.
53.
Elements which are shiny, conduct electricity and heat are called
a)
metal
b)
nonmetal
c)
metalloid
d)
nonexistent
54.
The atoms along the staircase are called 
a)
metals
b)
nonmetals
c)
metalloids
d)
noble gases
55.
How many neutrons are in a Gold atom?
a)
79
b)
196
c)
118
d)
275
56.
How many electrons does a Copper atom have?
a)
63
b)
29
c)
92
d)
34
57.
What's a valence electron?
a)
electrons in the second energy level
b)
electrons in the outermost energy level
c)
the atomic number
d)
electrons in the first level
58.
What does the 1.00794 stand for?
a)
Hydrogen
b)
atomic number
c)
atomic mass
d)
atomic explosion
59.
The positive particles of an atom are 
a)
electrons 
b)
positrons 
c)
neutrons 
d)
protons 
60.
Particles in an atom that are neutral and have no charge are 
a)
negatrons 
b)
electrons 
c)
neutrons 
d)
protons 
61.
The electrons of an atom are found...
a)
in the outer "cloud" surrounding the atom.
b)
in the nucleus of the atom.
c)
in the cloud and in the nucleus.
62.
The subatomic particle with a negative charge is the
a)
electron
b)
proton
c)
neutron
d)
nucleus 
63.
What is the atomic mass equal to?
a)
the number of protons
b)
the number of protons and neutrons
c)
the number of neutrons
d)
the number of protons and electrons
64.
In the modern periodic table elements are arranged by:
a)
atomic mass
b)
atomic number
c)
valence electrons
d)
number of isotopes
65.

Charcoal powder is insoluble in water. When water is filtered, the charcoal powder becomes the _______.

a)

solute

b)

residue

c)

filtrate

d)

solvent

66.

This process allows the fine flour particles to pass through the holes of the strainer while the bigger impurities remain on the strainer. What is this process called?

(a)  

67.

What is the basis for separating the components of a mixture through distillation?

a)

freezing point of the substances

b)

room temperature

c)

decaying period

d)

boiling pint of the substances

68.

Which of the following statements is NOT true about the image?

a)

The process is called filtration.

b)

A process known as sedimentation is important to make the separation possible.

c)

The substance that passes through the filter paper is called the filtrate.

d)

This method is used to separate insoluble solids from liquids.

69.

When is manual separation applicable?

a)

When the particles of the mixture are large enough to be seen clearly.

b)

When the solutes in the mixture are totally dissolved by the solvent.

c)

Only colloidal mixtures can be separated manually.

d)

When the mixture is exposed to heat.

70.

The image shows a mixture of concrete nails and saw dusts. What technique is best to use to separate the nails from the saw dusts?

a)

sieving

b)

chromatography

c)

decantation

d)

magnetic separation

71.

Which of the following techniques is used to separate the components of a solution?

a)

filtration

b)

decantation

c)

evaporation

d)

physical manipulation

72.

Dyes in water soluble markers may be separated by means of

a)

Simple distillation

b)

Crystallisation

c)

Chromatography

d)

Filtration

73.

Which technique is shown in the image?

a)

seiving

b)

filtration

c)

decanting

d)

crystallization

74.

The droplets of water that appear on the outside of a glass of cold water on a warm day are an example of?

a)

sublimation

b)

condensation

c)

evaporation

d)

sedimentation

75.
This circuit won't work. What essential part is missing from this circuit?
a)
resistance
b)
source of electric current
c)
conductor
d)
ammeter
76.
The best conductors for electricity are made of...
a)
wood
b)
plastic
c)
rubber
d)
metal
77.
This measures the speed of the current in a circuit
a)
voltage
b)
ammeter
c)
switch
d)
resistance
78.
Which circuit (s) are parallel?
a)
A
b)
A and B
c)
B and C
d)
C
79.
If you replace the paper clip with a plastic spoon, what happens?
a)
The bulb doesn't light
b)
The bulb is dimmer
c)
The wires get hot
d)
There is no change
80.
What kind of circuit is this?
a)
series
b)
parallel
81.
this is the symbol for a _____?
a)
switch
b)
light 
c)
battery
d)
wires
82.
What kind of circuit is this?
a)
Series
b)
Consecutive
c)
Parallel
d)
Training
83.
The picture shows an electrical circuit. This circuit is a series circuit because: 
a)
It has 3 light bulbs.
b)
The same current flows through all three light bulbs.
c)
It uses a single battery.
d)
The electrical current has more than one path to flow through
84.
this circuit is .....?
a)
open
b)
parallel
c)
closed
d)
The cutest little circuit evah!
85.
What is a circuit?
a)
A constant flow of electricity 
b)
A path that a current can flow along
86.

Why electrical wiring usually are covered with a layer of plastic?

a)

To make it look pretty

b)

To help electricity flow along the wire

c)

To make it safe

d)

To add more energy

87.

Why is electrical wiring usually made from copper?

a)

Because copper is shiny

b)

Because copper conducts electricity

c)

Because copper is not magnetic

d)

Because copper insulate electricity

88.

1. Which switch or switches must be closed to make the lamps light?

a)

Only switch 1

b)

Only switch 1

c)

Switches 1 and 2

d)

Switches 1 , 2 and 3

89.

Heat always travels from...

a)

Warm to cool

b)

Cool to warm

c)

Warm to warm

d)

Cool to cool

90.

A hot air balloon rising is an example of ...

a)

conduction

b)

convection

c)

radiation

d)

connection

91.

A snowman melting in the sun

a)

convection

b)

conduction

c)

radiation

d)

connection

92.

Eggs cooking in a frying pan

a)

convection

b)

conduction

c)

radiation

d)

connection

93.

Heating a kettle on a hot stove (burner)

a)

convection

b)

conduction

c)

radiation

d)

connection

94.

Thermal energy that is transferred from one substance to another.

a)

heat

b)

temperature

c)

thermal energy

d)

radiation

95.

At what point does the biker have the greatest Kinetic Energy?

a)

Point A

b)

Point B

c)

Point C

d)

Point D

96.

At what point does the biker have the greatest Potential Energy?

a)

Point A

b)

Point B

c)

Point C

d)

Point D

97.

At what point does Potential Energy transform into Kinetic Energy?

a)

Point A

b)

Point B

c)

Point C

d)

Point D

98.

Which Apple has the greatest Gravitational Potential Energy?

a)

Apple A

b)

Apple B

c)

Apple C

d)

Apple D

99.

Which Apple has the greatest Gravitational Potential Energy?

a)

The object with a mass of 3kg because its mass is less.

b)

The object with a mass of 50kg because its mass is greater.

c)

Both objects because they are at the same height.

d)

Neither of the objects because they are at the same height.

100.

What type of energy is transformed in the Energy Conversion shown in the image below?

a)

Nuclear Energy

b)

Chemical Energy

c)

Thermal Energy

d)

Electrical Energy

101.

What is the Energy Conversion that is shown in the image?

a)

Radiant to Thermal

b)

Thermal to Chemical

c)

Chemical to Radiant

d)

Radiant to Chemical

102.

Which of the following is an example of a Thermal Conductor?

a)

Plastic

b)

Styrofoam

c)

Wood

d)

Copper

103.

Which of the following is an example of a Thermal Insulator?

a)

Iron

b)

Aluminum

c)

Wood

d)

Copper

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