ADEC Examinations

Transcription

1 S7 Science: Grade 7 Name : School : Section: 90 Minutes ADEC Examinations Optional: Scientific calculator (not graphic display) Read these instructions first: 1. Complete the box above 2. Write in blue or black pen 3. The paper consists of (9) questions 4. Read each question carefully; attempt every one 5. Any diagrams/shapes are not drawn to scale 6. Do not write in the right-hand margin 7. There is a glossary sheet English-Arabic available if you need it S7 Front Cover S7

2 Answer all questions in the spaces provided. 1. The diagrams show examples of balanced and unbalanced forces. a) Label each diagram as either a balanced or unbalanced force. b) Each picture shows a big ball being pushed by two people. Explain what will happen to the ball in each picture. S7 page 2 of 16

3 2. The diagrams show examples of chemical and physical changes. a) Tick ( ) the reactions that are chemical changes. Food cooking Ice cream melting Sugar dissolving Wood burning S7 page 3 of 16

4 (b) The diagram shows a chemical reaction. Magnesium Burning magnesium White powder after burning (i) Describe a change to the magnesium after burning. (ii) Tick ( ) the word equation that describes this chemical reaction. S7 page 4 of 16

5 3. The bar chart shows the number of students with different eye colors in a class. Number of Students blue brown green gray hazel Eye Color (a) Identify the most common eye color. (b) Suggest one other characteristic that could show variation between these students. (c) Explain why eye color is an example of discontinuous variation. S7 page 5 of 16

6 (d) Use the Venn diagram to classify the following traits as Inherited (Genetic), Environmental or Both. Language Blood group Eye color Height Pierced ears Weight Inherited Causes of Variation Both Environmental Causes of Variation S7 page 6 of 16

7 4. The table shows data about planets in our Solar System. Planets are listed in order by their distance from the Sun. Average distance Time for one Diameter Average surface Planet from the Sun orbit around Sun temperature (million km) (Years) (km) ( C) Mercury Venus Uranus Neptune (Data obtained from The Guinness Book of Astronomy, Patrick Moore; published by Guinness 1992) (a) Write the names of the four missing planets in the table. (b) State the distance between Neptune and the Sun....million km (c) State the time it takes Uranus to orbit the Sun....years (d) Identify the hottest planet. (e) Identify the smallest planet. S7 page 7 of 16

8 5. The diagrams show the positions of the earth, sun and moon during a solar and a lunar eclipse. Diagram 1: SUN Diagram 2: SUN (a) Label each diagram as either a solar or lunar eclipse. (b) Explain what causes a solar eclipse. (c) Explain what causes a lunar eclipse. S7 page 8 of 16

9 6. Draw a line to match each space body with its picture, then draw another line to match each picture with its description. (Total of six lines) Body Picture Description Galaxy A pattern of stars Comet A group of solar systems Constellation Made of ice, dust and rocky materials S7 page 9 of 16

10 7. In recent years, the number of Houbara birds in Abu Dhabi has decreased. The graph shows the estimated numbers of Houbara in different areas of Abu Dhabi. 900 Estimated Population Per Area Yo Dlbsah Um Al Zumul Bergha Sokur Baynunah Sir Bani Yas Al Maha Al Bida s Houbara Population Area Merzoum Maghayel Salem Margham Yaeila (a) What is the estimated population of Houbara at Al Maha? (b) In which area would you find the greatest population of Houbara? (c) Suggest one reason why there are more Houbara in this area (b) than in other areas of Abu Dhabi. S7 page 10 of 16

11 Different organizations in Abu Dhabi have released Houbara birds back into the wild. The table shows the number released between 2004 and Year Number released Houbara released in Abu Dhabi Number of Houbara Released Year (d) Complete the line graph to show the number of Houbara released in Abu Dhabi between 2007 and (e) Based on the graph, predict how many birds will be released in S7 page 11 of 16

12 8. Some students carried out an investigation. They used the following method: METHOD: Step 1: Step 2: Step 3: Place 5 bean seeds in each of 3 labeled pots (A, B, C) with 200g of soil. Add 10 ml of water to each pot. Place the pots in 3 places with different amounts of light, as in the table. Use a ruler to measure the growth of the plants in each pot for 10 days. Add the same amount of water to the seeds each day. POT A: In cupboard (no light) POT B: Light bulb (some light) POT C: Sunlight (a lot of light) Bean seeds (a) Complete the sentence to suggest the question the students are trying to answer. How does changing the affect? (b) Identify one variable that is changed. (c) Identify one variable that is measured. (d) Identify two variables that are kept the same. S7 page 12 of 16

13 After 10 days, the students observed that the beans in all 3 pots showed some growth. The picture shows the amount of growth in each pot. 2 cm 5 cm 15 cm PLANT A: Pot in dark cupboard PLANT B: Pot under light bulb PLANT C: Pot in sunlight (e) Complete the table of results for the plant growth. Plant Growth Height (cm) Plant A Plant B Plant C (f) Based on these results, suggest a conclusion for this experiment. S7 page 13 of 16

14 9. Salem wants to measure the length of a leaf. He has this equipment: Beaker (a) Label each piece of equipment. (one has been done for you) (b) Circle the best piece of equipment for doing this investigation. (c) Explain why your answer to (b) is the best choice. End of Questions S7 page 14 of 16

15 S7 page 15 of 16 There are no questions on this page

16 S Back Page Science: Grade 7 Level Mark Checksheet Level Q Outcome/s Awarded Q Outcome/s Awarded 1a 7P4 N E D 6 7E7 N E D M 1b 7P4 N E D M 7a 7S10 N E 2a 7M6 N E 7b 7S10 N D 2b (i) 7M6 N D 7c 7S11 N M 2b (ii) 7M6 N M 7d 7S9 N M 3a 7S10 N E 7e 7S10 N M 3b 7L7 N E 8a 7S1 N D 3c 7L7 N D 8b 3d 7L7 N M 8c 7S3 N E D M 4a 7E6 N E 8d 4b 8e 7S8 N M 7E6 N D 4c 8f 7S11 N E D 4d 9a 7S4 N E 7E6 N M 4e 9b 7S4 N D 5a 7E5 N E 9c 7S4 N M 5b 5c 7E5 N D M Calculating mark values - Teacher Total Ns x 0 0 Total Es x 0.25 Total Ds x 0.5 Total Ms x 1 [Total Should = 27] Total /17.75 Calculating mark values - Checker Total Ns x 0 0 Total Es x 0.25 Total Ds x 0.5 Total Ms x 1 [Total Should = 27] Total /17.75 Mark/100 using conversion scale S7 Back Cover