Name: Unit 1 Test Practice Date:

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1 Name: Unit 1 Test Practice Date: 1. What is the length of the garden snail in the diagram below, from the beginning of its foot at point A to the end of its foot at point B? 3. To compare the growth of plants grown under specific colors of light with that of plants grown under natural conditions, four groups of bean plants were grown under the light conditions indicated below. All other factors were kept constant. Group A red light Group B green light Group C violet light Group D white light A) 2.6 mm B) 26 mm C) 26 cm D) 260 cm 2. The diagram below shows a portion of a graduated cylinder. What is the volume of the liquid in this cylinder? A) 22 ml B) 24 ml C) 25 ml D) 26 ml In this investigation, which group of plants served as the control? A) A B) B C) C D) D 4. Which statement about a rock sample is an inference? A) The rock scratches a glass plate. B) The rock was formed 100 million years ago. C) The rock's mass is 254 grams. D) The rock is red. 5. A group of people was used to test the effectiveness of a new toothpaste compared to their regular toothpaste. Which of the following procedures represents a controlled test? A) Have everyone in the group brush with the new toothpaste. B) Have everyone brush with both their regular toothpaste and the new toothpaste. C) Have half the group brush with the new toothpaste and the other half not brush their teeth. D) Have half the group brush with the new toothpaste and the other half with their regular toothpaste. 6. In order to make observations, an observer must always use A) experiments B) the senses C) proportions D) mathematical calculations

2 7. Look at the two pictures below. They show what happened when two solid blocks were each put in a jar containing a liquid. Based just on what you can see in the pictures, what can you say about the blocks and the jars? A) The liquid in the jars must be water. B) The block in jar 1 weighs more than the block in jar 2. C) The block in jar 1 is floating lower in its liquid than is the block in jar 2. D) The block in jar 1 must be made of metal and the block in jar 2 must be made of wood. 8. During a laboratory activity, a student combined two solutions. In the laboratory report, the student wrote A yellow color appeared. The statement represents the student s recorded A) conclusion B) observation C) hypothesis D) inference 9. Which statement about a major hurricane is an inference? A) The wind speed was 200 km/hr. B) The central air pressure was mb. C) A rain gauge records three inches of rain in less than one hour. D) Damage from the storm is expected to be extensive. 10. Why do scientists consider any hypothesis valuable? A) A hypothesis requires no further investigation. B) A hypothesis may lead to further investigation even if it is disproved by the experiment. C) A hypothesis requires no further investigation if it is proved by the experiment. D) A hypothesis can be used to explain a conclusion even if it is disproved by the experiment. 11. A student measured an earthworm using a metric ruler, as shown in the diagram below. What is the length of only section A? A) 76 mm B) 11.6 cm C) 45 mm D) 6 cm 12. Which statement about a rock sample is most likely an inference? A) The rock has flat sides and sharp corners. B) The rock is made of small, dark-colored crystals. C) The rock has thin, distinct layers. D) The rock has changed color due to weathering.

3 13. The graph below shows the temperature during a day in April. 19. Which factor would have the least effect on the results of an experiment designed to determine which model plane stays in the air longest? A) The color of the model planes. B) The size of the wings. C) The shape of the wings. D) Weight distribution in the models. 20. The sphere was dropped into water in a graduated cylinder as shown below. The temperature change between 10 a.m. and 2 p.m was approximately A) 9 B) 5 C) 11 D) A student says "I predict that water is a conductor of electricity." A scientist would classify this statement as A) a hypothesis. B) an experiment. C) a conclusion. D) a fact. 15. What is the final step of the scientific method? A) identifying the problem B) drawing conclusions C) performing an experiment D) forming a hypothesis 16. In an experiment, a factor that changes is called a A) control. B) hypothesis. C) variable. D) check factor. 17. The logical and systematic process of solving a problem is known as A) an experiment. B) the conclusion. C) the scientific method. D) a hypothesis. 18. In order to test a hypothesis, a scientist would A) draw a conclusion. B) perform an experiment. C) identify the problem. D) organize information. What is the volume of the sphere? A) 15 ml B) 25 ml C) 40 ml D) 65 ml

4 21. Base your answer to the following question on the information below and on your knowledge of biology. In an investigation, 28 students in a class determined their pulse rates after performing each of three different activities. Each activity was performed three times during equal time intervals. The average results are shown in the graph below. Before constructing the graph it would have been most helpful to organize the results of the investigation in A) a research plan B) an equation C) a data table D) a generalization Base your answers to questions 22 and 23 on the illustration of a student is performing an experiment below. 22. What is the student is doing wrong and how he should correct himself? 23. Explain why a test tube of material being heated, as shown in the picture, should not be stoppered? 24. Explain how you can find out the volume of a solid object, such as a small rock, using only water and either a measuring cup or a graduated cylinder.

5 25. Base your answer to the following question on the required experimental setup below. a) According to the setups, what is one possible hypothesis that was tested in this experiment?

6 Answer Key Science 7 Unit 1 Test Review 1. B 2. B 3. D 4. B 5. D 6. B 7. C 8. B 9. D 10. B 11. C 12. D 13. C 14. A 15. B 16. C 17. C 18. B 19. A 20. B 21. C 22. The student is aiming the test tube towards his body. He should aim it away. The student is not wearing safety goggles- he needs to put them on. 23. The stopper could be forced out of the tube and injure someone nearby/ The test tube could explode. 24. (essay) 25. The growth of both plants

7 Answer Key Science 7 Unit 1 Test Review 24. Student correctly describes how to determine the volume of a solid object using water and a measuring cup or graduated cylinder. Comparison or change in volume of water should be explicit. Method A: Pour some water into the graduated cylinder Record the water level Then put the rock in the graduated cylinder Record the water level again The difference between the first and second volume measurements is the volume of the rock Method B: Spillage Responses = Fill cup (to the top), add rock, catch the water that overflows in separate container, and measure the overflow. Overflow = volume of the rock.