91 POINTS IF YOU DONT ANSWER ALL IM BLOCKING YOU IF YOU COMMENT FOR POINTS IM BLOCKING YOU There are many variables in an experiment. Which variable should you only have one of in each experiment
A) controlled variable
B) independent variable
C) dependent variable
3)
Which one is NOT an example of a model that can be by teachers and students
A) Plastic human skeleton figure
B) Small Globe with oceans and continents labeled
C) Solar system made out of fruits
D) A large pine cone
4)
Lucy decides to make a cake for her mother’s birthday. She turns on the oven and sets the temperature to 350 degrees. The oven starts the preheating process and slowly will increase in temperature until it reaches the 350 degrees and then it will stop heating up.
When the oven reaches the 350 degree temperature it is an example of which part of the system
A) input
B) output
C) feedback
D) none of the above
5)
Jack walks outside in the afternoon and noticed the clouds are very dark. He states that it looks like it will rain very soon.
His statement can be classified as
A) prediction
B) observation
C) inference
D) hypothesis
6)
Sandra is conducting an experiment on the speed of toy cars and how they are affected by the type of surface they are placed on. Sandra measures the distance each car travels on carpet, tile and hardwood floors. She also records the time each toy car takes to cover the distance.
Which of the following is the appropriate measuring instrument and unit for measuring distance in this experiment
A) yard stick; kilometer
B) ruler; centimeter
C) ruler; inches
D) ruler; feet
7)
You are driving on the interstate and see a sign that says the speed limit is 50 miles per hour.
This is the correct units for measuring speed (distance and time) according to the international system of units
A) True
B) False
C) .
D) .
8)
Why do scientists use the International System of Units (SI)?
A) so all scientists are guaranteed to come up with the same measurements
B) so they can communicate their results without confusion
C) because the tools scientists use only measure in SI units
D) because the SI is based on the metric system
9)
A student is trying to find out if people prefer vanilla ice cream or chocolate ice cream. She buys several containers of regular chocolate ice cream and low fat vanilla ice cream. She hands out small sample of each flavor to the testing group she has gathered and asks them 5 minutes later which one was their favorite. Of the 100 people she tested, 80 said they prefer the chocolate ice cream.
This situation is an example of
A) personal bias
B) experimental bias
C) cultural bias
D) a controlled experiment
10)
Every system has an input, process and an output. Some might even have feedback that can affect the entire system.
When you turn on the tv with a remove control that starts the process. The tv turning on is an example of what part of the system?
A) input
B) output
C) process
D) feedback
11)
Different rose bushes are grown in a greenhouse for two months. The number of flowers on each bush is counted at the end of the experiment.
Which is the dependent variable in this experiment?
A) four months (the time you let them grow)
B) type of bushes
C) number of flowers on each bush at the end
D) the number of bushes you initially planted
12)
Claire walks into the kitchen after hearing a loud noise. She noticed a spilled glass of milk on the floor and says that the cat must
have been on the counter and knocked the glass over.
Claire’s statement can be classified as a
A) observation
B) prediction
C) inference
D) hypothesis
13)
A student hypothesizes that a goldfish will be more active in a bowl that has red gravel than in a bowl with grey gravel. To test this hypothesis, the student places one goldfish in a bowl with red gravel and another goldfish in a bowl with grey gravel. The color of the gravel is the variable in the experiment.
A) control
B) responding
C) dependent
D) independent
14)
You are measuring the mass of different chemicals to get ready to conduct an experiment.
Which one would be a example of the correct International System of Measurement units to use for measuring mass?
A) ounces
B) grams
C) pounds
D) tablespoons
15)
Why do scientists use models of natural systems?
A) Scientists use models of natural systems because these systems are often too large, too small, or too complex to study
directly
B) Scientists use models of natural systems because they like to use art in science
C) Scientists use models of natural systems because the models are more accurate than the actual system
D) Scientists use models of natural systems because models work exactly the way these systems do in nature