1.
How many significant figures are in 3.04?
Correct Answer
B. 3
Explanation
The number 3.04 has three significant figures. Significant figures are the digits in a number that carry meaning in terms of precision. In this case, the digits 3, 0, and 4 are all significant because they contribute to the overall value of the number. The zero between the 3 and 4 is also significant because it is between two nonzero digits. Therefore, the correct answer is 3.
2.
Convert 402 m into Km.
Correct Answer
A. .402 km
Explanation
To convert meters to kilometers, we divide the given value by 1000, since there are 1000 meters in one kilometer. Therefore, to convert 402 meters into kilometers, we divide 402 by 1000, resulting in 0.402 kilometers.
3.
Mrs. McCarthy wants to test what the freezing point of a 1% salt water solution is. She fills a vial with 10 mL of tap water and another vial with 10 mL of the 1% salt water solution. She then puts it in the freezer with a thermometer in each vial. She records the temperature every 2 minutes until it freezes. What is the independent variable in this experiment?
Correct Answer
D. The types of water
Explanation
The independent variable in this experiment is the types of water. Mrs. McCarthy is testing the freezing point of different types of water - tap water and a 1% salt water solution. She is manipulating the types of water by filling one vial with tap water and another vial with the salt water solution. The independent variable is the factor that is being changed or manipulated in an experiment, and in this case, it is the types of water.
4.
Mrs. McCarthy wants to test what the freezing point of a 1% salt water
solution is. She fills a vial with 10 mL of tap water and another vial
with 10 mL of the 1% salt water solution. She then puts it in the
freezer with a thermometer in each vial. She records the temperature
every 2 minutes until it freezes. What is the dependent variable in
this experiment?
Correct Answer
B. The time it takes for the salt water to freeze
Explanation
The dependent variable in this experiment is the time it takes for the salt water to freeze. This is because the freezing time is being measured and recorded as the experiment progresses. The other options, such as the thermometer, regular water, and types of water, are not being specifically measured or recorded in this experiment.
5.
Mrs. McCarthy wants to test what the freezing point of a 1% salt water
solution is. She fills a vial with 10 mL of tap water and another vial
with 10 mL of the 1% salt water solution. She then puts it in the
freezer with a thermometer in each vial. She records the temperature
every 2 minutes until it freezes. What is the control in
this experiment?
Correct Answer
C. The regular tap water
Explanation
The control in this experiment is the regular tap water. The control is the standard against which the experimental group is compared. In this case, the regular tap water is used as a baseline to compare the freezing point of the 1% salt water solution. By comparing the freezing point of the salt water solution to the freezing point of the regular tap water, Mrs. McCarthy can determine the effect of the salt on the freezing point. The control ensures that any changes in the freezing point are due to the presence of salt and not other factors.
6.
What is 3.22 x 10^{3} in long form?
Correct Answer
D. 3220
Explanation
The long form of 3.22 x 10^3 is 3220. In scientific notation, when a number is multiplied by 10 raised to a power, it indicates how many places the decimal point should be moved to the right. In this case, 3.22 is multiplied by 10^3, which means the decimal point should be moved three places to the right. So, the long form of 3.22 x 10^3 is 3220.
7.
How many significant figures are in 0.00345
Correct Answer
C. 3
Explanation
The number 0.00345 has three significant figures. Significant figures are the digits that carry meaning in a number. In this case, the digits 3, 4, and 5 are significant because they are not zero and they contribute to the overall value of the number. The leading zeros before the 3 are not significant because they only indicate the decimal point's position.
8.
Convert 250 Km into mm.
Correct Answer
D. 250000000 mm
Explanation
To convert kilometers to millimeters, you need to multiply the given value by 1,000,000. Therefore, 250 kilometers is equal to 250,000,000 millimeters.
9.
A accepted measurement of a length of wood is 3.5 m. Your measurement of a piece of wood is 2.5 m. What is your percent error?
Correct Answer
A. 28.6%
Explanation
The percent error is calculated by taking the absolute difference between the accepted measurement and your measurement, dividing it by the accepted measurement, and then multiplying by 100. In this case, the absolute difference is 3.5 m - 2.5 m = 1 m. Dividing 1 m by 3.5 m and multiplying by 100 gives us a percent error of 28.6%.
10.
Using significant figures, what is the answer to the following problem?3.46 x 6.2 x 4 x 5.035
Correct Answer
B. 400
Explanation
The answer 400 is obtained by multiplying the given numbers 3.46, 6.2, 4, and 5.035 using significant figures. Since 4 has only one significant figure, it limits the result to one significant figure. Therefore, the answer is rounded to the nearest whole number, which is 400.