PHYSICAL SCIENCE: practice test
1. 1. The amount of space an object takes up is
known as its
a) mass b)
volume c) weight d) density
2. A tissue sample is found that has a cell
structure unlike that of any known organism from
the planet earth. The sample is available for analysis. This evidence should be considered
a) scientific b) not scientific c) silly d) crazy
questions
3 & 4 refer to the following experiment
To determine how sound levels change with
distance from the source, a portable stereo was placed in the middle of the
football field. The loudness of the
sound was measured at different distances from the speaker.
3. What was the Manipulated variable?
a) loudness of sound at different
locations
b) volume setting on the stereo
c) distance from the speaker
4. What would have been a controlled
variable?
a) loudness of sound at different
locations
b) volume
setting on the stereo
c) distance from the speaker
5. How many significant figures are there in the following
numbers?
a) 2,000 ______1_____ b) 0.002050
____4________
c) 130.0 ______4_____ d)
0.000005 ______1______
6. Calculate the following: 9.34 ´ 10 - 5 ´ 4.30 ´ 10 - 7 = 4.02
´ 10 - 11
(Answer is rounded for significant figures)
7. Write
the answer to the following calculations, and then round the answer to the
correct
number
of significant figures.
Calculator
answer significant figure answer
a)
17.8 ¸ 2,800 = .00635714.. .0064
b)
5500 ´ 0.1220 = 671 670
c)
3.2 ´10 5 ´ 4.78 ´ 10-12 = 1.5296 ´ 10 - 6 1.5 ´ 10 - 6
8. Find the mass, volume and density of the
rubber stopper at your lab bench:
Mass: Volume Density
9. What device is used for measuring volume?
a) stereo b) balance c) graduated
cylinder d) spring scale
10. Convert 17.2 meters to millimeters 17,200 mm
11. Convert 2,200 ml to gallons.
(1 gallon = 3.78 liters) 0. 58 gal
12. Is data obtained from a balance is A) qualitative or b) quantitative?
13. If you don't calibrate your measuring
device, your data may not be very
a) precise b)
accurate c)
quantitative
14. Mr. Samson weighs about 170 pounds. This measurement is
a) accurate
but not precise b)
precise but not accurate
c) both accurate and precise d) neither accurate nor
precise
15. If the ruler shown below measured in cm,
what is the length of the rectangle? 3.37 cm
Use the graph below and the
description of the investigation to answer questions 16 - 27
An investigation was performed in order to see how changing the temperature affects the ability of Oxygen to dissolve into water. The person conducting the investigation expected to find that higher temperatures would allow more Oxygen to dissolve since that is what is true for solids like sugar and salt. Eight different water samples were used each at a different temperature. Each sample contained 100 ml of water through which pure Oxygen was bubbled for 5 minutes. Temperature was measured in oC , and Oxygen was measured in PPM (parts per million). The graph above shows the results of the investigation.
16. What was the Manipulated variable in this experiment? Temperature
17. What was the Responding variable? Dissolved oxygen (oxygen in water)
18. Identify two controlled variables: amount of water, oxygenated for same amount of time
19. What mistake was made in labeling this graph? No units
20. What type of relationship appears to exist between the two variables? Inverse square
21. Which data point is probably an outlier? (41,7)
22. What affect would removing the outlier have on the RMSE of the equation? It would decrease
23. What is the specific equation for this data
set? Dissolved oxygen = 3810 / temp2
24. Use the equation for this data set to predict the amount of oxygen that can be dissolved at a
temperature of 8 oC: 60 PPM
25. Use the equation for this data set to predict the temperature at which the value for dissolved
oxygen would have a value of 2: 43 oC
26. What was the investigator’s hypothesis:
if the temperature of the water is
increased, then the amount of oxygen that is dissolved in it will increase,
because that is what happens with solids such as salt
27. After looking at the data, what conclusion should the investigator have reached?
The hypothesis is
rejected. Increasing the temperature
actually decreased the amount of dissolved oxygen. When the temperature was 10 oC there was 27 PPM of dissolved Oxygen, but when the
temperature was 60 oC the dissolved Oxygen was reduced to only 1 PPM
28. why do helium balloons float upwards? It is less dense
than air
29. If a sample of mercury that fills a space
of 11 ml has a mass of
143 g what is its density?
13 g/ml
30. If the density of glass is 2.21 g/ml, how
much volume would 665 g occupy? 301 ml
31. The density of gold is 19.3 g/ml. A pure gold wedding ring is dropped into a
graduated
cylinder and the water level rises 2.4
ml. What is the mass of the ring? 46 g
32. Methanol has a density of 0.78 g/ml and lithium has a density of 0.53
g/ml. Would lithium
float or sink in a beaker of
methanol? float
Go to the lab bench to
answer questions 33 -35
33. What is the mass of the brass keys? » 22.5 g
34. What is volume of the brass keys? » 2.5 ml
35. What is the density of the brass keys? » 9.0 g/ml