Name:

Science Unit Practice Test

Match each definition with the correct word from the list.

scientific law hypothesis scientific method
scientific theory manipulated conclusion
control(s) responding controlled
scientific model quantitative qualitative

  1. A _______________________ is a description of a natural occurrence that has been observed many times.
  2. We use a ______________________ to represent something in science that we cannot observe directly or is too complicated to work with exactly.
  3. A way to investigate problems by gathering information in an organized way and using logical steps to arrive at an explanation is the _________________.
  4. The ______________ of the experiment are a special group of test subjects that have nothing done to them. They will be used for comparison.
  5. _______________ variable - what the experimenter will change during the experiment.
  6. _______________ variables are kept constant for the experiment so the experimenter knows changes are due to just the manipulated variable changing.
  7. A ________________ measurement gathers data about numbers and units.

Observation and inference

The statements below apply to the image on the classroom TV. For each statement, indicate if it is an observation or an inference and explain why you think that.

  1. It is a duck.
     
  2. It is a Japanese duck.
     
  3. The duck is swimming.
     
  4. The bright colors means it is a male duck.
     
  5. The duck is in a man-made pond.
     
 

Experimental Design

Oscar is doing an experiment with ketchup.

He wants to know which brand takes the longest to come out of the bottle. For his experiments he tips each new bottle of ketchup at the same angle and uses his watch to time how long it takes the ketchup to drip onto the table top. He has four brands of ketchup:

Heinz Newman's Western Family Mr. Rick's Old Hickory
  1. What is a possible hypothesis?
     
  2. What is the manipulated variable ?
  3. What are the levels of the manipulated variable ?
  4. What is the responding variable ?
  5. What are the controlled variables ?

Janice wants to find out which sandpaper lasts the longest.

She gets three sheets of 220 grit paper from the shop. Each has the same roughness (220 grit), each is made from a different material and has a different color. Janice rubs each piece of sandpaper on a new section of 2" by 4" pine wood for 50 strokes. She then feels if the sandpaper is still rough and how rough it is. The three types of sandpaper are:

Garnet paper (red) Aluminum oxide (black) Quartz paper (brown)
  1. What is a possible hypothesis?
     
  2. What is the manipulated variable ?
  3. What are the levels of the manipulated variable ?
  4. What is the responding variable ?
  5. What are the controlled variables ?