Scientific Endeavour

Which of the following is/are examples of qualitative data?

• The book is heavy.

• The book weighs 124 g.

• This student is taller than that student.

• The student is 154 cm tall.

A (blank) is a proposed explanation for an observation.

(a)  

Which of the following is changed in an experiment?

• dependent variable

• independent variable

• constant variable

Which of the following is measured in an experiment?

• dependent variable

• independent variable

• constant variable

A student conducted an experiment to test the effect of light intensity on the number of flowers a plant grows. She kept temperature and the volume of water given to each plant everyday the same.

What was the independent variable in her experiment?

• light intensity

• number of flowers a plant grows

• temperature

• volume of water given to each plant

Which instrument(s) is/are used to measure volume of a liquid?

• test tube

• electronic balance

• digital calipers

• measuring cylinder

• burette

Which of the following are SI units?

• cm

• kg

• min

• mm

• K

What type of error is introduced into a measurement when the marking of an instrument is viewed from the wrong angle?

(a)  

A student poured mercury into a measuring cylinder. What is the volume of mercury?

• 50 cm3

• 54 cm3

The image represents multiple readings taken in an experiment. Which of the following describes the readings correctly?

• high accuracy, low precision

• high precision, low accuracy

• high accuracy and precision

• low accuracy and precision