Post Test in Science 7

Post Test in Science 7

Department of Education

REGION III – CENTRAL LUZON

SCHOOLS DIVISION OF PAMPANGA

GOOD LUCK GRADE 7

Multiple Choice

1. Carla planted papaya seeds separately in cans. She used different amounts of fertilizer in germinating the seeds. The volume of each liquid is the same and exposure to light was moderate. She found out that the papaya seeds germinated at different times. What is the independent variable in the set up?

• A. The time of germination of the seeds

• B. The different amount of liquids

• C. The amount of sunlight     

• D. The amount of fertilizer

Multiple Choice

2. What science processes does Sandy use when she groups her collection of flowers according to color?

• A. Classifying and measuring

• B. Classifying and testing                                            

• C. Observing and classifying  

• D. Observing and inferring                        

Multiple Choice

3.You observed that the iron grills in your gate become rustier after the rain. You wonder why they become rusty. Which step in the scientific method is involved?                                                                                        

• A. Formulating hypothesis     

• B. Gathering data       

• C. Identifying the problem     

• D. Making conclusion

Multiple Choice

4.Calcium is an essential element that makes bones stronger. Which of the following is the symbol for this element?

• A. C

• B.  Ca 

• C.  N   

• D.  Na

Multiple Choice

5.Sodium chloride (NaCl), a combination of sodium (Na) and chlorine (Cl), is dissolved in water. After several days, the water had evaporated and the salt was left in the container. How will you classify the salt?

• A. Compound 

• B. Element     

• C. Metal

• D. Mixture

Multiple Choice

6.Which of the following statements is NOT TRUE?

• A. Components of water can be separated by electrolysis.

• B. Compounds are made up of one kind of element.

• C. Sodium Chloride is made up of two elements.

• D. Compounds are more complex than elements.

Multiple Choice

7.Compounds are different from mixtures because________________

• A. Compounds are held together by   chemical bonds

• B. Compounds can be separated by physical means

• C. Mixtures cannot be separated by physical means

• D. Mixtures are held together by chemical bonds.

Multiple Choice

8.Seawater is a mixture made up of salts and water. Which of the following statements BEST describes seawater?

• A. Seawater has components that are chemically combined.

• B. Seawater has components that are strongly bonded to one another.

• C. Seawater cannot be filtered and it shows a single physical appearance.

• D. Seawater shows the different physical characteristics of the components.

Multiple Choice

9. Ella was given three unknown liquid samples. Her observations are written in the table below.Which of the samples are probably the SAME substances?

• A.    Liquid 1 and 2 may be the same substance.

• B.    Liquid 2 and 3 may be the same substance.

• C.    Liquid 1 and 3 may be the same substance.

• D.    All of the liquids may be the same substance.

Multiple Choice

10.Which of these factors will cause more sugar to dissolve in the saturated sugar solution?

I.          Add more sugar

II.         Add more sugar and heat the solution

III.        Add more sugar and cool down the solution

• A. I only

• B. II only

• C. I and II only

• D. I, II and III  

Multiple Choice

11.In which step is the solution described as saturated? (Refer to the table)

• A. Step 1 

• B. Step 2 

• C. Step 3

• D. Step 4

Multiple Choice

12.Lance prepared a solution that contains 6% of sodium chloride. How will you describe the concentration of solution prepared by Lance?

• A. The solution contains 6% of sodium chloride and 94% of water.

• B. The solution contains 0.6 % of sodium chloride and 0.94 % of water.

• C. The solution contains 60 grams of sodium chloride and 40 grams of water.

•        D. The solution contains 100 grams of sodium chloride and 100 grams of water.

Multiple Choice

13.The students in Science 7 were asked to prepare a solution containing 50 grams of solute and 200 grams of solvent. What is the percentage concentration of the solution?

• A. 0.25 %

• B. 4 %

• C. 25 %

• D. 40%

Multiple Choice

14.Arthur needs to change the LPO to HPO to focus on the specimen he is studying. Which part should he manipulate?

• A. Coarse adjustment knob

• B. High power objective

• C. Revolving nosepiece

• D. Stage

Multiple Choice

15.You are to transfer the microscope to the next room. Which parts should you be holding in carrying it properly?

• A. Arm and base

• B. Arm and stage

• C. Draw tube and base

• D. Eyepiece and base

Multiple Choice

16. Samuel has mounted a specimen on a glass slide. On which part of the microscope is he going to place it if he wants to see the image of the specimen?

• A.    Diaphragm

• B.    Eyepiece

• C.  Revolving nosepiece

• D.  Stage

Multiple Choice

17. Which is the correct sequence from biggest to smallest level of organization in an organism?

• A. Organism → Organ System → Tissue → Organ → Cell

• B. Organism → Organ System → Organ → Tissue → Cell

• C. Organism → Organ → Tissue → Organ System → Cell

• D. Organism → Organ → Organ System → Tissue → Cell

Multiple Choice

18. Rita’s mother was hospitalized due to chest pain and difficulty in breathing. Laboratory examination showed an increase in cholesterol in blood. Which organ system is mostly affected?

• A.    Circulatory

• B. Digestive        

• C.  Nervous    

• D.  Skeletal

Multiple Choice

19. The organ systems of plants consist of the root and shoot systems. Why is it important for these organ systems to work together?

• A. To grow and survive

• B. To avoid pest and other animals   

• C. To survive floods and strong winds

• D. To survive droughts and earthquakes

Multiple Choice

20. Plants undergo photosynthesis because of the presence of chlorophyll. What do you call the organelle that produces the chlorophyll?

• A. Chloroplast

• B. Cytoplasm

• C. Nucleus

• D. Plasma Membrane

Multiple Choice

21. Which part of an animal cell plays an important role during cell division?

• A.  Centriole   

• B.  Chloroplast

• C. Cytoplasm            

• D.  Vacuole

Multiple Choice

22. Which of the following differentiates asexual reproduction from sexual reproduction?

• A. Asexual reproduction requires gametes while sexual reproduction requires body parts

• B. Asexual Reproduction undergoes fertilization while sexual reproduction undergoes budding

• C. Asexual reproduction does not require gametes while sexual reproduction requires union of    gametes

• D. Asexual reproduction produces offspring which is different from the parent while sexual reproduction produces offspring identical to the parent

Multiple Choice

23. An animal is a biotic component of an ecosystem that needs water, radiant energy, minerals and oxygen in order to survive. This statement shows that an organism depends on which of the following?

• A. Abiotic component

• B. Biotic component

• C. Essential nutrients

• D. Minerals

Multiple Choice

24. Parasitism is a relationship wherein one organism lives in or on another organism and consequently harms the host while it benefits. All of the following are examples of parasitism, EXCEPT;

• A. Ascaris on dog

• B. Fern attached to the narra tree

• C. Tick that feeds on the dog

• D. Hookworms inside the animal’s intestine

Multiple Choice

25. What kind of relationship is exhibited when a bee flies to another flower?

• A. Commensalism

• B. Mutualism

• C. Parasitism

• D. Predation

Multiple Choice

26. When a fern thrives on a tree, what relationship is involved?

• A. Commensalism

• B. Competition

• C. Mutualism

• D. Parasitism

Multiple Choice

27. Kyle walked 200m east from home to visit Bella. He then walked another 400m north to fetch Rico and both of them walked 200m west to watch the pigeons. He left Rico then walked 400m north. Which of the following statements is NOT true?

• A. Kyle went home

•  B. Kyle has travelled a total distance of 1,200m.

•  C. Kyle’s displacement is shorter than the total distance he has travelled   

•  D. Kyle’s displacement is zero if he has travelled 400m north after leaving Rico.

Multiple Choice

28. During your trip to your grandmother’s house, your bike’s speed changes from 0 m/s to 30 m/s in 15 seconds. What is your acceleration?

• A. 2 m/s2

• B. 45 m/s2

• C. 0.2 m/s2

• D. 0.45 m/s2

Multiple Choice

29. Data were obtained from 500 meter dash competition finals in the Olympics. Based on the table, which country did best in the said competition?

• A. China

• B. Nigeria

• C. Philippines

• D. USA

Multiple Choice

30. Analyze the graph below, which of the athletes has travelled the longest at 20 minute-time interval?

• A. Athlete 1

• B. Athlete 2

• C. Athlete 3    

• D. Both B and C

Multiple Choice

31. Mechanical waves transport energy from one place to another through:

• A.    Alternately vibrating particles of the medium

• B.    Vibrating particles and traveling particles

• C.    Particles traveling with the wave

• D.    None of the above

Multiple Choice

32. Which of the following best describes a high frequency sound?

• A. High pitch

• B. Low pitch

• C. Low energy

• D. A and C

Multiple Choice

33. A piano and a violin are played at the same time producing sound waves of the same frequency and amplitude. Which of the following is TRUE?

• A.    Both instruments have the same pitch, loudness and timbre

• B.    Both instruments have the same pitch and loudness but different timbre

• C.    Both instruments have the same pitch and timbre but different loudness

• D.    Both instruments have the same loudness and timbre but different pitch

Multiple Choice

34. To which of the following is loudness closely related?

• A.    Intensity

• B. Melody

• C.    Pitch

• D.    Quality

Multiple Choice

35. How would you relate the brightness or intensity of light with the distance from the source?

• A. The farther the light source, the dimmer is the light and the higher the intensity

• B. The farther the light source, the brighter is the light and the lower the intensity

• C. The nearer the light source, the dimmer is the light and the higher the intensity

• D. The nearer the light source, the brighter is the light and the higher the intensity

Multiple Choice

36. ROYGBIV is the basic component of white light. Which color of light carries the most energy?

• A. Blue

• B. Green

• C. Orange

• D. Red

Multiple Choice

37. A cup of hot water is poured into a cup of cold water. What could happen next?

• A.    The temperature of both hot and cold water will decrease.

• B.    The temperature of both hot and cold water will change until they are the same.

• C.    The temperature of hot water will increase as the temperature of cold water will decrease.

• D.    The temperature of hot water will remain the same but the temperature of cold water will increase.

Multiple Choice

38. The figures below show 3 pairs of plates. The electrostatic force between the plates is shown for each pair.  If B is negative, what is the charge of A? And what kind of force will exist between A and C?

• A. negative, attractive

• B. negative, repulsive

• C. positive, attractive 

• D. positive, repulsive

Multiple Choice

39. Which of the following activities will help us protect our natural resources?

• A. Planting trees

• B. Burning plastics

• C. Rice fields are turned into commercial centers

• D. Farmers used too much artificial fertilizers to replenish soil

Multiple Choice

40. Your community is rich in metallic minerals. Which of the following should the community undertake in order to conserve such precious mineral deposits?

• A. Use all of them to earn money

• B. Put up tunnels to harvest all metallic minerals

• C. Use dynamite to clear out the mountain

• D. Formulate laws and ordinances to regulate the mining of minerals

Multiple Choice

41. What conservation practice do you apply when you immediately repair a leaking faucet?

• A. Recycling

• B. Reducing

• C. Resourcing

• D. Reusing

Multiple Choice

42. The Ozone layer protects us from UV rays coming from the sun. Which layer of the atmosphere contains the ozone layer?

• A. Mesosphere

• B. Thermosphere

• C. Troposphere

• D. Stratosphere

Multiple Choice

43. How does energy from the sun enter the atmosphere?

• A. It reaches earth and enters the atmosphere through radiation.

• B. The sun’s energy enters anywhere in space including earth.

• C. It enters the atmosphere by vibrating through air particles of the atmosphere.

• D. The plants in the earth attract the sun’s energy making it enter the earth’s atmosphere.

Multiple Choice

44. What is FALSE about ITCZ?

• A. It results in thunderstorms

• B. It occurs in the countries near the equator

• C. It occurs in the Philippines all year round

• D. It is a place where wind in the tropics meet, rise and form clouds

Multiple Choice

45. While on the beach, you and your friends are studying local winds. The leader of your group explains that the wind direction during the day is usually the reverse of the wind direction at night. Which of the following statements supports your leader’s claim?

• A. There is more water in the sea than on land

• B. This is usually an indication that an El Niño event is underway

• C. The water remains at about the same temperature all throughout the day

• D. Land heats up faster than water during the day and it cools up faster at night

Multiple Choice

46. Which is true about the length of the day and night when direct rays of the sun fall on the equatorial region?

• A. The length of the day and the length of night in the Northern and Southern Hemispheres are the same

• B. The nights are longer in the Northern Hemisphere

• C. The nights are longer in the Southern Hemisphere

• D. The days are longer in the Northern Hemisphere

Multiple Choice

47. How would you describe the position of the Earth’s tilt during the northern summer solstice?

• A. Earth’s tilt does not point toward or away from the sun

• B. Earth’s tilt points away from the sun

• C. Earth’s tilt points toward the sun

• D. Earth’s tilt shifts to a lower value

Multiple Choice

48. What occurs during a lunar eclipse?

• A. The shadow of the sun falls on Earth

• B. The shadow of the moon falls on Earth

• C. The shadow of the sun falls on the moon

• D. The shadow of the Earth falls on the moon

Multiple Choice

49. During a solar eclipse, which alignment of the sun, Earth and the moon occur in the correct sequence?

• A. Earth – sun – moon

• B. Moon – sun – Earth

• C. Sun – Earth – moon

• D. Sun – moon – Earth

Multiple Choice

50. During a lunar eclipse, which alignment of the sun, Earth and the moon occur in the correct sequence?

• A. Earth – sun – moon

• B. Moon – sun – Earth

• C. Sun – Earth – moon

• D. Sun – moon – Earth

CONGRATULATIONS