Work sheet (1) Chapter (1)
Subject
Name
Date
Grade
9
Cluster
SI Units
core
I-Choose the best answer:
1. ____ describes a rule of nature.
a.
Scientific theory
c.
Scientific law
b.
Scientific method
d.
Physics
2. Scientists make an educated guess about a question they ask called a ____ .
a.
hypothesis
c.
b.
scientific method
scientific theory
d.
model
3. The field of science that studies mass and energy relationships is ____ .
a.
biology
c.
chemistry
b.
physics
d.
models
4. Creating or using a formula to help you understand an idea is using a ____ .
a.
scientific law c.
b.
model
scientific method
d. hypothesis
5. The experimental process that a scientist uses to solve a question involves a variety of ____ .
a.
models
b.
hypotheses
c. scientific laws
d.
scientific methods
6. A ____ is an explanation supported by experimental results.
a.
scientific theory
b.
hypothesis
c.
scientific law
d. model
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7. The base SI unit for length is the _____ .
a.
foot
c.
meter
b.
inch
d.
kilogram
8. The metric prefix that means 1106 is _____ .
a.
pico
c. nano
b.
mega
d. giga
9.
Which of the following is not an SI base unit?
a.
meter
b.
kilogram
c.
d.
Celsius
second
10. What two dimensions, in addition to mass, are commonly used by physicists to derive additional
measurements?
A.
B.
C.
D.
length and width
length and time
area and mass
velocity and time
11. The symbol mm represents a
A.
B.
C.
D.
micrometer
megameter
millimeter
manometer
12. The SI base unit used to measure mass is :
A.
liter
B.
meter
C.
kilogram
D.
second
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13. The SI base unit for time is
A.
B.
C.
D.
1 day
1 minute
1 hour
1 second
14. The most appropriate SI unit for measuring the length of an automobile is the
A.
micrometer
B.
meter
C.
kilometer
D.
nanometer
II- solve the following questions
15- Convert 15km to meters using scientific notation.
16. Convert
g to kilograms using scientific notation.
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17. Convert
m to millimeters using scientific notation.
18. The total mass of four containers is 5.000 kg. If the mass of container A is 256 mg, container B is 5117 cg, and
container C is 382 g, what is the mass of container D?
19. Show that the measurements below are equivalent.
5687nm
, 0.00005687 dm
20. Starting from rest, an object with uniform acceleration a, will reach a speed of v in time t according to the formula
v  at. How long will it take a bicyclist to go from rest to 5 m/s accelerating at 0.5 m/s2?
III- Answer the following question(s):
17.
How can only seven basic units serve to express almost any measured quantity?
The basic units can be combined to form derived units for other quantities.
18.
How can method error be minimized?
by standardizing the method of taking measurements
20.
What two base quantities are used to measure speed?
Length and time
21.
What is unique about the value of a conversion factor? Why is this value important?
It equals 1 ,it doesn’t change the value of the measurement.
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