Title: Mid Unit Assessment
Course: MNPCC Physics > Section: Introduction to Physics

The purpose of this quiz is to see how your knowledge is progressing during the unit.

Q: Which is the best choice for the measurement of the box depicted here?
- 2.04 cm (Correct!)
- 2.4 cm (That is not an accurate measurement.)
- 2 cm (That is not precise enough for this ruler.)
- 2.036 cm (That is too precise for this ruler.)
A: 2.04 cm
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: Which of the following would be a reasonable answer for the height of a person in an SI base unit?
- 1.8 m (Correct!)
- 180 cm (This is a good estimate, but it is not in a base unit!)
- 75 kg (This is a base unit, but not for the height, it would be for the mass.)
- 750000 g (This is not a base unit, nor a unit you would use to measure height.)
A: 1.8 m
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: Which of the following is a derived unit of measurement (not a base unit)?
- Joule (Correct)
- Kelvin (This is the base unit of temperature.)
- Kilogram (This is the base unit of mass.)
- Second (This is the base unit of time.)
A: Joule
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: Which of the following correctly shows the conversion from 1.57 kg to g?
- 1.57 kg * (1000 g / 1 kg) (Correct)
- 1.57 kg * (1 kg / 1000 g) (This will not give you the proper unit, you always put the wanted unit over the unit you have.)
- 1.57 kg * (1000 kg / 1 g) (This will give you the correct number, but (1000 kg / 1 g) does not equal one and will give the incorrect units.)
- 1.57 kg * ( 1 g / 1000 kg) (This cancels units correctly, but is not the correct relationship between g and kg.)
A: 1.57 kg * (1000 g / 1 kg)
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: How many significant digits are in the number 0.003020?
- 4 (Correct.)
- 2 (The zero between the 3 and the 2 is significant, there is no way to write the number without it. The zero at the end was put there specifically to convey level of precision, so cannot be dropped.)
- 3 (The zero at the end was put there specifically to convey level of precision, so cannot be dropped.)
- 6 (The first 2 zeros are not significant, the number can be rewritten as 3.020 * 10^-3.)
A: 4
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: Which answer represents the answer to the following equation with proper significant digits?

5.2 g + 2110 g =
- 2120 g (Correct)
- 2110 g (You need to round, not truncate.)
- 2100 g (For addition, you use the place of the least precise to determine answer, not the number of digits.)
- 2115.2 g (This is what the calculator would give you, but it is much too precise given the 0.1 cm.)
A: 2120 g
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: Which answer represents the answer to the following equation with proper significant digits?

15.34 g / 122 cm^3
- 0.126 g/cm^3 (Correct)
- 0.125 g/cm^3 (Round, do not truncate!)
- 0.12 g/cm^3 (Too few significant digits.)
- 0.13 g/cm^3 (Too few significant digits.)
A: 0.126 g/cm^3
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: Which answer shows a group of measurements that were made accurately and to the correct precision with a standard cm ruler with mm markings.
- 12.32 cm, 12.31 cm, 12.31 cm, 12.33 cm (Correct)
- 12.313 cm, 12.313 cm, 12.313 cm, 12.313 cm (You cannot read a standard cm ruler to this degree of precision.)
- 12.333 cm, 12.340 cm, 12.335 cm, 12.432 cm (You cannot read a standard cm ruler to this degree of precision.)
- 12.30 cm, 12.25 cm, 12.39 cm, 12.35 cm (These measurement are not accurate to within the precision of the measurement.)
A: 12.32 cm, 12.31 cm, 12.31 cm, 12.33 cm
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: Which of the following correctly writes the number 30500 in scientific notation?
- 3.05 * 10^4 (Correct)
- 3.05 * 10^5 (Only count how far you move the decimal, not the total number of digits.)
- 305 * 10^2 (This evaluates to the correct number, but it is not the proper way of doing scientific notation.)
- 3.5 * 10^3 (You can’t change the number, getting rid of that zero changes the number!)
A: 3.05 * 10^4
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: Which represents the number 0.0032 in proper scientific notation?
- 3.2 * 10^-3 (Correct)
- 3.2 * 10^-2 (Count how many places you move the decimal, not how many zeros there are.)
- 32 * 10^-4 (This would evaluate to the correct number, but it is not the correct form for scientific notation.)
- 3.2 * 10^-4 (Don’t count all the way to the end of the number, only to the first nonzero digit.)
A: 3.2 * 10^-3
If right: Your answer is correct.
If wrong: Your answer is incorrect.