Please Help! Will mark Brainliest! 100 Points!
Question 1: You need to measure the length of your driveway. Which measuring tool would produce accurate results that you would expect to be the same as those found by others?
A.) Your hand's span
B.) A string cut to the length of the tip of your finger to the bottom of your palm
C.) A meter stick with only centimeters
D.) A ruler with millimeters and centimeters
Qustion 2: Which two of the following are the densest of the materials shown?
Material: Mass (g): Volume (L):
Rock 1000 0.5
Pillow 200 10
Bottle of soda 2000 2
Loaf of bread 100 1
A.) Rock and bottle of soda
B.) Loaf of bread and pillow
C.) Bottle of soda and loaf of bread
D.) Loaf of bread and rock
Question 3: A student is measuring the effects of an electric circuit on a compass, and he is testing to see if increasing the current will cause the compass needle to change its direction faster. He does one trial using a 9-volt battery and another trial using a 1.5-volt battery. He takes accurate data. Based on good experimental design, which would improve his experiment?
A.) He should add a nonworking compass to act as a control.
B.) He should repeat the test with three additional batteries of varying voltages to demonstrate the reproducibility of results.
C.) He should use batteries of the same voltage but from different manufacturers, to show he has used different variables.
D.) He should use only one battery but do several trials, using different circuit designs to ensure he has appropriate test groups.
