Q: Which of the following is the correct conversion for $$2.54 cm to $$inches, given that $$1$$ inch $$= 2.54 cm$$?

$$2.54 cm$$ $$\times \frac{1 \ \text{inch}}{2.54 \ \text{cm}} = 1$$ inch

Q: A speedometer reads $$60 km/h. $$Convert this speed to m/s.

$$60 \ \text{km/h} \times \frac{1000 \ \text{m}}{1 \ \text{km}} \times \frac{1 \ \text{h}}{3600 \ \text{s}} = 16.7 m/s$$

Q: Convert $$4.5 g to mg.$$

$$4.5 \ \text{g} \times \frac{1000 \ \text{mg}}{1 \ \text{g}} = 4500 mg$$

Q: A student needs to convert $$2.00 dL to mL. $$What is the correct conversion?

$$2.00 \ \text{dL} \times \frac{100 \ \text{mL}}{1 \ \text{dL}} = 200 mL$$

Q: A student converts $$2.5 kg/m$^3 to g/cm$^3. $$What is the correct conversion?

$$2.5 \ \text{kg/m}^3 \times \frac{1000 \ \text{g}}{1 \ \text{kg}} \times \frac{1 \ \text{m}^3}{1,000,000 \ \text{cm}^3} = 0.0025 g/cm$^3$$

Q: A speedometer measures speed in km/h. If a car travels at $$90 km/h$$, how many meters does it travel in $$20$$ seconds?

$$90 \ \text{km/h} \times \frac{1000 \ \text{m}}{1 \ \text{km}} \times \frac{1 \ \text{h}}{3600 \ \text{s}} \times 20 \ \text{s} = 500 m$$

Question 1

A student measures the length of a metal rod using a ruler marked in millimeters. The student records the measurement as $$7.36 \pm 0.01 cm. $$Which of the following best explains the meaning of the uncertainty in this measurement?

Accepted Answer

The uncertainty shows the rod could be anywhere between 7.35 cm and 7.37 cm.

Question 2

When reading the volume in a graduated cylinder, which of the following is the correct procedure?

Accepted Answer

Read the value at the bottom of the meniscus.

Question 3

A thermometer shows a temperature between two marks, with each mark representing $$1 \ ^\circ \mathrm{C}. If $$the mercury level is halfway between 22 and 23, what is the correct way to record the temperature?

Accepted Answer

$$22.5 \ ^\circ \mathrm{C}$$

Question 4

Which of the following is the correct conversion for $$2.54 cm to $$inches, given that $$1$$ inch $$= 2.54 cm$$?

Accepted Answer

$$2.54 cm$$ $$	imes \frac{1 \ 	ext{inch}}{2.54 \ 	ext{cm}} = 1$$ inch

Question 5

A speedometer reads $$60 km/h. $$Convert this speed to m/s.

Accepted Answer

$$60 \ 	ext{km/h} 	imes \frac{1000 \ 	ext{m}}{1 \ 	ext{km}} 	imes \frac{1 \ 	ext{h}}{3600 \ 	ext{s}} = 16.7 m/s$$

Question 6

Which of the following is the correct SI prefix for $$10^{-6}$$?

Accepted Answer

micro

Question 7

A buret is used to deliver a liquid. Which of the following is true about reading the buret scale?

Accepted Answer

The scale decreases from top to bottom.

Question 8

Convert $$4.5 g to mg.$$

Accepted Answer

$$4.5 \ 	ext{g} 	imes \frac{1000 \ 	ext{mg}}{1 \ 	ext{g}} = 4500 mg$$

Question 9

A student needs to convert $$2.00 dL to mL. $$What is the correct conversion?

Accepted Answer

$$2.00 \ 	ext{dL} 	imes \frac{100 \ 	ext{mL}}{1 \ 	ext{dL}} = 200 mL$$

Question 10

Which of the following best describes why it is important to estimate the last digit when recording a measurement?

Accepted Answer

It reflects the precision of the measuring instrument.

Question 11

A laboratory thermometer is used to measure the temperature of a solution. The mercury level is exactly at the 25 $$^\circC $$mark. How should the temperature be recorded?

Accepted Answer

$$25.0 \ ^\circ \mathrm{C}$$

Question 12

Which of the following is the correct derived unit for speed in the SI system?

Accepted Answer

$$	ext{m/s}$$

Question 13

A student converts $$2.5 kg/m$^3 to g/cm$^3. $$What is the correct conversion?

Accepted Answer

$$2.5 \ 	ext{kg/m}^3 	imes \frac{1000 \ 	ext{g}}{1 \ 	ext{kg}} 	imes \frac{1 \ 	ext{m}^3}{1,000,000 \ 	ext{cm}^3} = 0.0025 g/cm$^3$$

Question 14

Which of the following is the correct exponential notation for the prefix 'nano'?

Accepted Answer

$$10^{-9}$$

Question 15

A speedometer measures speed in km/h. If a car travels at $$90 km/h$$, how many meters does it travel in $$20$$ seconds?

Accepted Answer

$$90 \ 	ext{km/h} 	imes \frac{1000 \ 	ext{m}}{1 \ 	ext{km}} 	imes \frac{1 \ 	ext{h}}{3600 \ 	ext{s}} 	imes 20 \ 	ext{s} = 500 m$$

Question 16

Which of the following is NOT a correct statement about using measuring instruments in the laboratory?

Accepted Answer

Record only the numbers that are printed on the instrument.

Question 17

A student needs to convert $$32 ft$^2 to m$^2. $$Given $$1 ft$$ $$= 0.3048 m$$, what is the correct conversion?

Accepted Answer

$$32 \ 	ext{ft}^2 	imes (0.3048 \ 	ext{m}/1 \ 	ext{ft})^2$ = 2.973 m$^2$$

Matter and Measurements: Measurement Techniques and Working with Units

Study Guide - Practice Questions

Study Guide - Flashcards