Transcript 7th Grade Pre

th
7
Grade Pre-Post Test
Science
Question 1
A student observing the sky notices that the cirrostratus
clouds she saw in the morning have been replaced by
cumulonimbus clouds in the afternoon.
What weather conditions can she expect for the afternoon
and evening?
A. low clouds and fog with little temperature change
B. fair skies continuing with scattered puffy clouds
C. light rain, then an increase in temperature and clearing
skies
D. heavy wind and rain followed by a drop in temperature
and clearing skies
Question 2
3. Which sequence correctly shows the
order from simplest to most complex in
multicellular organisms?
4. The primary source of energy for
most living things is
A.
B.
Plants
Sun
C. Food
D. AMP’s
5. What is the relationship between tissues and
organs?
A. Organs are made from one type of tissue.
B. Tissues are made from one type of organ.
C. Tissues are made from different types of
organs.
D. Organs are made from different types of
tissues.
6. In a multicellular organism such as a fish, which of
these items is composed of all the others?
A. Tissues
B. Organs
C. Cell structures
D. Organ systems
7. This cellular process converts light energy
from the sun into chemical energy that
organisms use for life functions.
A. Respiration, in which oxygen is used and
carbon dioxide is given off.
B. Fermentation, in which sugar is broken
down and alcohol is given off.
C. Digestion, in which starch is broken down
into simple sugars.
D. Photosynthesis, in which carbon dioxide is
used and sugars are
•produced.
8. These two plant cell structures are
responsible for storing energy from sunlight
and later releasing it for cells to use.
A. Chloroplast and nucleus
B. Mitochondrion and cell wall
C. Chloroplast and mitochondria
D. Nucleus and cell wall
9. Which cell structure carries out a function
for a cell that is similar to the function that bark
carries out for a tree?
A. Cell Wall
C. Chloroplast
B. Nucleus
D. Mitochondrion
10.
11.
12.
13.
14.
15.
Question 16
A meteorologist collects data on the weather
conditions at an airport. The diagram
shows a weather station model of the data
that he collected.
At the time these data were collected, flights
at the airport were delayed.
According to this information, which weather
condition caused the delay?
A. thick fog
B. heavy snow
C. freezing rain
D. strong winds
Properties of Some Substances – Use this chart for questions
17-18
A scientist measures out 15 mL each of baking soda,
salt, sugar, iron filings, and corn starch. She runs a
series of procedures and records her results in the
table below. The first column in the table indicates the
procedure. The remaining columns indicate her results
for each substance.
Question 17
According to the information in the table,
what comparison can the scientist make
about the densities of sugar and corn
starch?
A. Sugar is more dense than corn starch.
B. Corn starch is more dense than sugar.
C. Sugar and corn starch have the same
density.
D. Both sugar and cornstarch are more
dense than salt.
Question 18
The scientist observes the rust on the sample
of iron filings and dries the sample
thoroughly. The scientist weighs the entire
sample and finds that it has more mass than
the original 118 grams.
What explains this increase in mass?
A. The sample gained mass during drying.
B. The sample gained mass during a physical change.
C. The sample gained mass during a change of state.
D. The sample gained mass during a chemical change.
Question 19
What two changes does sugar undergo
when heated in a spoon over a flame?
A. two physical changes
B. two chemical changes
C. a chemical change and then a physical
change
D. a physical change and then a chemical
change
Question 20
The moon orbits the Earth about
every
A. 28 days
B. 31 days
C. 24 days
D. 60 days
Use the water cycle diagram to
answer questions 21-22
Question 21
What evidence suggests that water goes through
a physical change when it evaporates in the water
cycle?
A. The density of the water remains the same.
B. The volume of the water remains the same.
C. The physical properties of the water remain the
same.
D. The chemical properties of the
water remain the same.
Question 22
The diagram includes an ocean in the water
cycle. How does salt water from the ocean
end up as fresh water in precipitation?
A. Runoff leaves salt in the soil.
B. Precipitation leaves salt in the clouds.
C. Evaporation leaves salt in the ocean.
D. Condensation leaves salt in the water
vapor.
Question 23
What is the primary energy source that
drives Earth’s water cycle between the
atmosphere, oceans and land?
A. wind
B. sunlight
C. ocean currents
D. rotation of Earth
Question 24
Water gains energy during evaporation.
During what process in the water cycle is
this energy released?
A. percolation through soil
B. transpiration from plants
C. runoff into the lake and ocean
D. condensation that forms clouds
Question 25
The range of an acid on the pH scale is
A. 0-6
B. 8-14
C. 7
D. 15 and above
Question 26
Questions 27-28
Baking Soda and Vinegar Reaction
Students perform a chemistry experiment
by mixing baking soda with vinegar. They
mix
4 grams of baking soda with 50 grams of
vinegar in a 6-gram plastic cup as shown
below.
The cup is left uncovered. The students
record the mass and temperature of the
mixture
every 5 seconds. They continue these
observations until 10 seconds after they
see the
mixture stop bubbling. Their data are
shown in the table below.
Question 27
Question 28
The data in the table show the temperature of the cup-baking sodavinegar system. The temperature of the surrounding air was not
measured. Assuming that the total amount of energy remains
constant, what conclusion about energy transfer does the
temperature data support?
A. Thermal energy was lost from the surrounding air and the
system.
B. Thermal energy was gained by the system and the surrounding
air.
C. Thermal energy was transferred from the surrounding air to the
system.
D. Thermal energy was transferred from the system to the
surrounding air.
Question 29