Unit I The Circulatory and Nervous Systems1. Why does the heart have to pump blood?

a. To provide the necessary force for the blood to move from the lower to the upper part of the body

b. To collect all the waste materials from the body cellsc. To exchange the necessary nutrientsd. Both a and b

2. Which part of the circulatory system carries the nutrients and removes waste from the body cells?

a. Arteriesb. Bloodc. Capillariesd. Heart

3. What force pulls the blood to the lower part of the body?a. Adhesionb. Diffusionc. Gravityd. Magnetism

4. Which of the following is the function of the circulatory system?a. To distribute body cellsb. To protect the body from heat and foreign bodiesc. To distribute oxygen and nutrients to body cells and collect their wastesd. To repair body cells

5. How will you describe the heart?a. It is an inflexible organ.b. It is a hollow muscular organ.c. It works like a pump.d. Both b and c

6. What will happen to the heart if it was made of bony tissues?a. It will easily breakb. It will pump more bloodc. It will not be able to squeeze bloodd. It will not move

7. Why is the heart important?a. It checks the flow of blood.b. It stops the flow of blood.c. It makes the blood move throughout the body.d. It occupies the chest cavity.

8. It is known as the “river of life.”a. Salivab. Sweatc. Bloodd. Urine

9. Why is the blood important to the body?a. It gives color to our skin.b. It carries oxygen and nutrients to different cells of the body.c. It carries away carbon dioxide and other wastes from the body.d. B and c

10. The blood cells that carry oxygen to the cells are known as __________.a. Red blood cellsb. White blood cellsc. Plateletsd. Plasma

11. When germs enter the body through a cut in the skin, how does the body react?a. The white blood cells engulf or kill these germs.b. The red blood cells make the germs decrease in number.c. The platelets tend to clot and engulf the germs.d. The plasma thickens and surrounds the germs.

12. Why are the platelets important to the body?a. They carry oxygen to all parts of the body.b. They give the blood its red color.c. They make the blood clot to stop continuous bleeding.d. They surround the germs and weaken them.

13. Why do you NOT lose so much blood when you get cut?a. Blood flows through them.b. Blood vessels carry blood away and back to the heart.c. They allow blood and other substances that go with blood to flow through them.d. Blood contains substances needed to clot the blood.

14. Why are veins important in blood circulation?a. They carry blood with oxygen away from the heart.b. They carry blood with carbon dioxide toward the heart.c. They make the blood clot.d. They make the blood redder.

15. Why should arteries be tough?a. To carry fresh blood to all body parts.b. To withstand the pressure of blood due to the pumping of the heart.c. To enable blood to exchange nutrients.d. To carry waste materials to the lungs.

16. Why are the capillaries very small in size?a. They are the blood vessels that reach out to the cells.b. They carry blood to the brain.c. They carry oxygenated blood to the heart.d. They carry unoxygenated blood to the lungs.

17. Which blood vessel will allow a forceful flow of blood?a. Arteryb. Veinsc. Capillariesd. Venules

18. If you get sick, you are likely to develop _________.a. Lymph fluidsb. Lymph nodesc. Lymph vesslesd. Blood platelets

19. How do white blood cells defend the body against harmful bacteria?a. Be engulfing/killing harmful bacteriab. By decreasing in number during an infectionc. By preventing its entrance to the bodyd. By exploding them

20. The presence of enlarged lymph nodes indicates ___________.a. An infectionb. A recovery from an infectionc. You are in good shaped. You are very sick

21. Where are the lymph nodes located?a. Adenoidb. Tonsilsc. Neck, armpit, elbow and groin

d. Nails22. What is NOT true in the importance of the lymphatic system?

a. It strains germs and microorganisms.b. It traps all the germs and dust that enter the body.c. It returns the fluid and protein from tissue spaces to the circulatory system.d. It is a part of the nervous system.

MATCHING

23. Anemia24. Leukemia25. Hypertension26. Palpitation27. Rheumatic heart fever

28. What will happen if a person injures part of his/her brain?a. Action will continue to be coordinated.b. The brain decays.c. The person will die.d. The person cannot integrate and coordinate his/her movements.

29. Why is the brain enclosed in the skull?a. For protectionb. For sound proofingc. For designd. For a better look

30. This is the largest part of the brain and it controls mental processes such as thinking, memorizing and decision-making.

a. Spinal cordb. Cerebrumc. Cerebellumd. Medulla oblongata

31. This is a small part of the brain which coordinates voluntary muscular actions and maintains balance in the body.

a. Cerebrumb. Cerebellumc. Medulla oblongatad. Spinal cord

32. The spinal cord is protected by the spinal column because it is _______.a. Coloredb. Delicatec. Hardd. To be kept warm

33. The peripheral nervous system is made up of ________________.a. The cerebrum and the cerebellumb. The brain and the spinal cordc. The brain and the medulla oblongatad. The nerves that connect the central nervous system to various parts of the body

34. Which of these is not the function of the peripheral nervous system?a. Collects information from the sense organsb. Transmits information to the central nervous systemc. Delivers decisions to the body part which will perform the actiond. Delivers oxygen to different parts of the body

35. Which of these describes the autonomic nervous system?a. Controls involuntary functions of the body

a. Inflammation of the heart characterized by high fever that weakens the muscle and valves of the heart

b. Irregular heartbeatc. Cancer of the bloodd. An iron deficiency diseasee. Blood pressure suddenly shoots upf. Arteries thicken due to deposit of fat and cholesterol

b. Consists of sympathetic and cardiac nervesc. Maintains the best possible level for cells to reproduced. To bypass the brain when a reflex action happens

36. The central, the peripheral, and the autonomic nervous systems __________.a. Work separatelyb. Work by pairsc. Coordinate with each otherd. Work only when the need arises

37. How do the sympathetic and parasympathetic nerves work?a. When the sympathetic nerve produces an effect, the parasympathetic nerve

produces the same effect.b. When the sympathetic nerve produces an effect, the parasympathetic nerve

produces an opposite reaction.c. They work separately.d. They allow messages to pass through them freely.

38. Why are some parts of the body more sensitive than others?a. They have larger nerve endings.b. They have more nerve endings.c. They have tougher nerve endings.d. They have smaller nerve endings.

39. Which of these is a reflex action?a. Blinking of the eyelidsb. Beating of the heartc. Inhaling and exhalingd. Circulation of the heart

40. What is the usual path of messages received by the body from the environment?a. Brain nerves spinal cord sense organb. Nerves sense organ brain spinal cordc. Spinal cord sense organ brain nervesd. Sense organ nerves spinal cord brain

41. A healthy person smiles at others.a. Trueb. False

42. If a person gets easily irritated, he is mentally healthy.a. Trueb. False

43. Avoiding people is a result of emotional well-being.a. Trueb. False

44. You can study well if you are physically, mentally and emotionally fit.a. Trueb. false

45. Cooperating with others is a sign of good health.a. Trueb. False

Unit II Interrelationships in the Ecosystem1. A food web is __________ food chain(s).

a. Composed of severalb. A simplec. An energeticd. A decaying

2. The plant is considered the ______________.a. Primary consumerb. Producerc. Secondary consumer

3. What is transferred in a food web?a. Parasitesb. Predatorsc. Energyd. Water

4. Which of the following illustrates the food nutrient cycle?a. Bacteria—corn—molds—soil fertilizerb. Bacteria—waste materials—fertilizerc. Waste material –molds—corn—fertilizer—plantd. Fertilizer—waste material—corn—bacteria—molds

5. Why are decomposers important?a. They break down complex wastes into simple materials.b. They provide carbon dioxide and oxygen to the soil.c. They deplete the soil of nitrogen and other materials.d. They make the soil dry.

6. How do organisms utilize the stored energy from green plants?a. It enables them to move and carry out body functions.b. It converts waste materials into fertilizers.c. It traps the sun’s energy to manufacture their food.d. It changes simple raw materials to complex ones.

7. Which of the following illustrates the nitrogen cycle?a. Nitrogen in air b. Nitrogen in air

Ammonia Oxygen Decompose Decompose

Soil fertilizer Soil Plant

c. Animal Nitrogen d. Plants

Plant Nitrogen Water

8. Which of the following illustrates the oxygen-carbon dioxide cycle?Photosynthesis

a. Plant carbon dioxide

heat absorbed

Decomposers

decay

b. Bacteria oxygen

Photosynthesis evolves

plants

Photosynthesisc. Plant oxygen

Taken in inhalation

Carbon dioxide animals

Exhalation

d. predation

animal bigger animal

taken in give off

oxygen lightning carbon dioxide

release absorbed

9. Which is a by-product of respiration?a. Oxygenb. Carbon dioxide and waterc. Nitrogend. Both a and b

10. What will happen if the supply of carbon dioxide is permanently cut off?a. Green plants will grow.b. Photosynthesis cannot take place.c. Animals cannot undergo respiration.d. All of the above.

11. Which of the following products is not derived from water?a. Dyeb. Paintc. Rubberd. Corals

12. How does a forest prevent flash floods in the plains?a. Forest absorbs excess rainwater.b. Forest prevents frequent occurrence of rain.c. Forest makes the environment drier or humid.d. Forest shields rain from falling.

13. Why are forests good for the environment?a. Forests absorb excess amount of carbon dioxide in the air.b. Forests make the environment cool.c. Forests disrupt the ecological balance.d. Both a and b.

14. Which of the following is the effect of deforestation?a. Soil erosionb. Global warmingc. Increase of plant varietyd. Both a and b

15. Why is deforestation harmful to animals?a. It destroys their natural habitat.b. It enables them to multiply rapidly.c. It provides them more protection from their enemies.d. It gives them more space to move about.

16. Which of the following is NOT an effect of deforestation?a. It reduces his water supply.b. It causes floods to low-lying areas.c. It changes his lifestyle.d. It improves the quality of the topsoil.

17. Which of the following does NOT contribute to the disruption of oxygen-carbon dioxide cycle?

a. Continuous cutting down of treesb. Burning of fossil fuels on motor vehiclesc. Use of dynamites in fishingd. Planting of trees

18. Why is the use of sodium cyanide harmful?a. It destroys coral reefs.b. It results in global warming.c. It causes soil erosion.d. It produces pollutants such as carbon monoxide.

19. Why does the government prohibit dumping of chemical and industrial wastes in our bodies of water?

a. Because bodies of water are already pollutedb. Because marine life is sensitive to sunlightc. Because it increases dissolved oxygen in waterd. Because the wastes dumped in the water cause pollution

20. What problems may NOT occur due to a growing population?a. Shortage of foodb. Shortage of waterc. Shortage of spaced. Satisfaction of basic needs

21. Which of the following statements do you agree with?a. Population in a place remains constant.b. Population constantly changes due to birth and death.c. Population growth does not affect basic needs.d. Population growth cannot be slowed down.

22. Which of the following is the correct definition of population?a. Population is the kind of organisms living in a place.b. Population is the rate of increase and decrease of organisms living in a place.c. Population is the living condition of organisms in a place.d. Population is the specific number of a particular group of organisms living in a

specific place.23. Which of the following statements is true about overpopulation and its effect on the

environment?a. As the population grows, more garbage is produced.b. As population grows, more motor vehicles will emit poisonous exhaust gas.c. As population decreases, cholera, dysentery and tuberculosis will spread.d. Both a and b.

24. Why is overcrowding considered a danger?a. It encourages the spread of contagious diseases.b. It destroys our natural resources.c. It depletes our food reserves.d. All of the above

25. Pests multiply fast in crowded, dirty places.a. Trueb. False

26. An increase in the number of consumers in a place benefits the living things inhabiting it.

a. Trueb. False

27. The human body needs a big amount of vitamins to stay healthy.a. Trueb. False

Match the definition with a word from the box

28. Needed by a rapidly growing population29. Absorbs rainwater30. It exists when population in a place is stable31. Earth’s shield against harmful ultraviolet rays32. Hastens weathering and erosion

33. Presidential Decree No. 965 requires couples planning to marry to ____________.a. Attend a seminar on family planningb. Use artificial birth control methodsc. Limit their future family into eight membersd. Participate in a POPCOM information drive

34. To control birth rate, __________ are recommended by POPCOM.a. Attending birth control seminarsb. Responsible parenthoodc. Natural and artificial birth control methodsd. Family planning clinics

35. Why should rapid population growth be controlled?a. To ensure the health of the children and the proper distribution of resourcesb. To ensure bigger budgets for the government’s birth control programc. To curb unlawful activitiesd. To stop abortion

36. Which of the following is concerned with conserving endangered wildlife species?a. The Clean and Green Projectb. Piso Para sa Ilog Pasigc. World Wide Fundd. Recycling the Garbage Project

37. Why was Sagip Pasig launched?a. To educate the people in recycling garbageb. To inform the public of the dangers of CFCsc. To clean up the Pasig River and restore it to its former ecological stabilityd. To make Pasig River a source of geothermal energy

38. The DENR established ________ to help endangered animal species.a. Government agenciesb. Sanctuariesc. Reforestation programsd. Fund-raising campaigns

a. ozone layerb. ecological balancec. roots of plantsd. cutting of treese. basic necessitiesf. nutrients

UNIT III Materials in Our Environment

1. Which of the following is a food additive?a. Sodium chlorideb. Ammoniac. Bleachd. Turpentine

2. Why is citric acid added to juice drink preparations?a. To make the juice drink last longerb. To provide red colorc. To provide sour tasted. To dissolve the solids

3. Why are paints usually applied on the outer surface of walls?a. To protect the wall from the harmful effects of heat and rainb. To make homes more attractivec. To deodorize homesd. Both a and b

4. Why are pesticides used by farmers?a. To destroy plant pestsb. To increase crop yieldc. To kill harmful weedsd. Both a and b

5. Why are thinner and turpentine added to paints?a. To make paints easy to spread on surfacesb. To give color to paintsc. To remove molds in paintsd. To hold pigment particles together

6. How can ordinary glass be made heat resistant?a. By adding zinc to the glassb. By adding magnesium to the glassc. By adding boric oxide to the glassd. By adding cyanide solutions to the glass

7. Which of the following materials were improved by technology?a. Heat-resistant glassb. Iron orec. Dried leavesd. Cut bamboo

8. How is the capsule form of drugs better than the tablet form? It is ____.a. Less in weightb. Less in volumec. Attractived. More efficient because it dissolves in the target area

9. Why is fermentation beneficial to man?a. Fermentation makes raw rubber softer.b. Fermentation produces vinegar, wine and fish pastec. Fermentation enables frying pans to achieve a non-stick finishd. Fermentation removes stains from clothes

10. How can white clothes be made whiter?a. By heatingb. By vulcanizingc. By bleachingd. By ironing

11. Why is detergent in toothpaste beneficial to man?a. It reduces the formation of plaque

b. It makes food sweeterc. It prevents dental cariesd. a and c

12. Why are clams and mussels banned from consumption when red tide occurs?a. Because they have no nutritional valueb. Because they can multiply very fastc. Because they can cause paralysis or death when eatend. Both a and c

13. Why is acid rain harmful?a. Because it can contaminate water supply and corrode some materialsb. Because it can bring lots of rainc. Because it can make the surrounding hotd. Because it can bring about drought

14. What may occur as a result of the release of so much gaseous wastes particularly, carbon dioxide in the atmosphere?

a. Global coolingb. Global warmingc. Eutrophicationd. Flooding

15. What materials cause the instruction of the ozone layer?a. Chlorofluorocarbonsb. Hydrochloric acidc. Manganese oxided. Carbon dioxide

16. Why should on wash his hands thoroughly after using insecticides?a. To remove traces of poisonb. To avoid plant contaminationc. To transfer harmful effect of insecticides to the waterd. Both a and b

17. What should you do to avoid taking poisonous material by mistake?a. Separate poisonous substances from food itemsb. Label poisonous substances properlyc. Reread labels of materials or products before taking themd. All of the above

18. Which is an example of a biodegradable material?a. Plastic cupb. Tin canc. Woodd. Cement

19. How should nonbiodegradable wastes be disposed?a. By compostingb. By recyclingc. By reusingd. Both b and c

20. Which of the following are products of recycling garbage?a. Biogasb. Organic fertilizerc. Sawdustsd. Both a and b

21. Wastes that accumulate maya. Become breeding places of pests.b. Cause loss of the topsoil.c. Allow the free flow of rainwater run offs.d. Speed up the decomposition of nonbiodegradable wastes.

22. Composting cannot be hastened bya. Cutting and breaking biodegradable wastes.b. Allowing the waste materials to dry up.c. Turning the compost materials regularly.d. Adding organisms like Trichoderma.

23. Wastes should be segregated into ______ groups.a. Colored and whiteb. Hot and coldc. Biodegradable and nonbiodegradabled. Small and big

24. Which of the following proves that matter is made up of particles?a. Chocolate added to water diffuses or scatters in the liquidb. Spreading of odorc. Expansion of gas in a balloon makes it largerd. All of the above

25. How are particles in a block of wood arranged?a. Closely packed togetherb. Far apartc. Very far apartd. Very, very far apart

26. How do atoms differ from molecules?a. Atoms are bigger than moleculesb. Atoms are smaller than moleculesc. Atoms may or may not be bigger than moleculesd. Atoms may or may not be smaller than molecules

Unit IV Energy in Our Environment1. What form of energy does food provide the human body?

a. Mechanicalb. Chemicalc. Electricald. Nuclear

2. What form of energy is produced when strings of a guitar are plucked?a. Mechanicalb. Electricalc. Radiantd. Sound

3. What form of energy does a running motor produce?a. Chemicalb. Electricalc. Mechanicald. Nuclear

4. Why do bits of paper adhere to a comb that was rubber with a flannel cloth?a. Because the comb after rubbing acquires a chargeb. Because the comb has chemical energyc. Because the bits of paper are stickyd. Because the bits of paper are lighter than the comb

5. Why can the sun give off a tremendous amount of solar energy?a. Because it contains millions of nonmoving, unreacting atomsb. Because energy is released when the sun’s atoms combine/splitc. Because nuclear energy is locked up when atoms splitd. Because rays of the sun continue to glow

6. How is chemical energy stored in food used by the human body? It is used ______.a. For growthb. For growth and developmentc. For fatteningd. For increasing the body weight only

7. How is mechanical energy generated in a car?a. Through movement of the pistonb. Through the water found in fossil fuelsc. Through sunlight absorbed by the card. Through the oxidation of fossil fuels

8. Which device uses chemical energy on portable radios to produce sound?a. Dry cellb. Flashlightc. Generatord. Motor

9. Which material needs to absorb a lot of heat in order to burn?a. Paperb. Coconut treec. Alcohold. Acetone

10. Why can the human body perform various activities?a. Because of the energy it gets from foodb. Because of its fixed partsc. Because of oxygen in the bloodstreamd. Because of the water it contains

11. Which plant or factory dos NOT generate electricity?a. Hydroelectric plant

b. Geothermal plantc. Nuclear power plantd. Green plant

12. Which of the following generates electricity?a. Televisionb. Refrigeratorc. Generatord. Washing machine

13. Why is solar electricity commonly used as a source of energy in urban areas?a. Because it is fashionableb. Because it is convenientc. Because there is pollutiond. Because there is an abundance of sunlight

14. What is the chief source of radiant energy?a. Moonb. Sunc. Asteroidd. Comet

15. When is radiant energy harmful?a. It is used to disinfect beddingsb. It is used to diagnose diseasesc. It is used to dry clothesd. It causes sunburn

16. What is one way by which physicians determine a healthy pair of lungs?a. By using x-rayb. By using a camerac. By using a microscoped. By using a video machine

17. How is nuclear energy produced?a. Through splitting apart of nucleusb. Through the combination of the heavier atom with a lighter atomc. Through bombardment of atomsd. Both a and b

18. Which of the following does not use nuclear energy?a. Generation of electricityb. Power and submarinec. Powering spacecraftd. Plowing ricefield

19. Why is nuclear fusion less harmful than nuclear fission?a. Nuclear fusion produces very little radioactivity and less dangerous waste

products.b. Nuclear fusion has an abundant supply of radioactive wastes.c. Nuclear fusion can supply energy to homes.d. None of the above

20. Which of the following shoes the mechanical – sound energy change?a. Rice cookerb. Flat ironc. Alarm clockd. Oven toaster

21. What energy transformation does a blender or mixer show?a. Mechanical energy to electrical energyb. Electrical energy to mechanical energyc. Mechanical energy to chemical energyd. Thermal energy to mechanical energy

22. What energy transformation takes place in the engine of a typical train?a. Electrical to mechanical energyb. Radiant to electrical energyc. Chemical to mechanical energyd. Mechanical to electrical energy

23. What form of energy is commonly used in kitchen appliances?a. Light energyb. Electrical energyc. Nuclear energyd. Geothermal energy

24. What form of energy is contained in a battery or dry cell?a. Chemical energyb. Sound energyc. Electrical energyd. Both b and c

25. Which of the following does not show the transfer of energy from one body to another?

a. Eating corn on a cobb. Lighting a room with a fluorescent lampc. Placing a spoon in a hot cup of coffeed. Placing a cup of frozen cream in a freezer

26. When one uses an exhaust fan, what kind of energy is being transfer is being demonstrated?

a. Radiationb. Conductionc. Convectiond. Nuclear

27. Why is transfer of energy important?a. It allows us to cook food.b. It can make motor vehicles run.c. It can press our clothes.d. It is convenient.

28. What is always produced when there is energy transformation?a. Lightb. Heatc. Chemicald. Electricity

29. Which diagram best illustrates energy transformation and its by-product?a. Mechanical sound and heatb. Chemical mechanical heatc. Electrical mechanical and heatd. Electrical light and heat

30. Hear released in the environment maya. Result in lowering of air temperature.b. Still be recovered.c. Spread out indefinitely.d. Cause increase in temperature.

31. Which statement is true?a. Energy can be lost.b. Energy can be destroyed.c. Energy is conserved.d. Energy increases at the passage of time.

32. Which does not illustrate that energy is neither created nor destroyed but only transformed from one form to another?

a. Clapping of hands heatb. Ringing of a church bell soundc. Swinging of a pendulum kinetic energyd. All of the above

33. During the oxidation process, what happens to the digested food in the body?a. Chemical energy is changed to mechanical energy.b. Energy released is used.c. Energy is conserved during the transformation process.d. Both a and c

34. What happens to heat during energy transformation?a. Heat is absorbed by the surrounding environment.b. Heat escapes into outer space.c. Heat is reabsorbed by the heated object.d. Heat is changed to radiant energy.

35. Why is thermal pollution harmful?a. It enables fish to multiply fast.b. It destroys aquatic animals and plants.c. It makes water lily multiply faster than usual, thereby clogging river channels.d. Both a and c

36. Which of the following does not release heat to the environment?a. Burning paperb. Turning on the radioc. Boiling waterd. All of the above

UNIT V Moving Bodies1. Which of the following statements is true?

a. Speed is the product between distance and timeb. Speed is similar to velocityc. Speed is the distance traveled over a specific period of timed. Both a and b

2. Compute the speed of a runner who can run a 100-metre distance in 20 seconds?a. 7 meters/secondb. 8 meters/secondc. 5 meters/secondd. 10 meters/second

3. What is the speed of Jerry if he runs 200 meters in 50 seconds?a. 4 meters per secondb. 5 meters per secondc. 10 meters per secondd. 25 meters per second

4. In what direction does a bus travel if it runs opposite northeast?a. Northwestb. Northc. Southwestd. Southeast

5. Which vehicles have the same velocity?A. Bus A= 30km/hr, NorthB. Bus B= 30km/hr, SouthC. Bus C= 30km/hr, NorthD. Bus D= 30km/hr, Northeast

a. A and Bb. A and Cc. A and Dd. B and C

6. Which of the following indicates velocity?a. Ship moving in the oceanb. A racing carc. Car moving 100 km/hrd. Bicycle stopping at northeast point

7. Which of the following is an example of speed?a. 10 kmb. 10 secc. 10 km/secd. 10 km/sec, North

8. Which of the following statements is NOT true?a. Force is needed to accelerate the movement of an object.b. Velocity may change from time to time.c. The mass of an object affects its acceleration.d. The mass of an object does not affect its acceleration.

9. Why is it more difficult to stop a fully loaded truck than an unloaded one?a. Because its mass affects accelerationb. Because it has less mass than the otherc. Because it is affected by gravityd. Because it is bigger

10. Which of the following statements is true?a. The object with less mass has greater acceleration.b. Force and mass affect acceleration of a moving body.

c. The object with less mass decelerates slower.d. Both a and b

11. Which home appliance demonstrates centripetal force?a. Gas stoveb. Television setc. Washing machined. Electronic organ

12. Why are some parts of the egg thrown to the sides of the bowl when the egg is being mixed?

a. Because of the centripetal forceb. Because of the inertiac. Because of the force exerted by the persond. Both a and c

13. What will happen to a top if you let go of its string?a. The top will stop spinning.b. The top will spin in a straight path.c. The top will move upward.d. None of the above

14. In the whirling of the washer overhead, what is the direction of the centripetal force?a. Upwardb. Inwardc. Straightd. Outward

15. Which machine does NOT demonstrate circular motion?a. Eggbeaterb. Blade of washing machinec. Rotor blade of a helicopterd. Simple swing

16. On what layer of the Earth does man live?a. Crustb. Mantlec. Outer cored. Inner core

17. What is the outer core made of?a. Very hot molten rockb. Molten ironc. Molten nickeld. Both b and c

18. This part of the Earth is believed to be composed of hot and melted rock.a. Earth’s upper crustb. Earth’s lower crustc. Mantled. Atmosphere

19. Why do great earthquakes occur? They occur ______________.a. Because of shifting crustal platesb. Because of the waves coming from the oceanc. Because of the flowing streamd. Because of weak typhoons that hit certain areas

20. What is the intensity of an earthquake when people become panicky as small landslides occur?

a. Intensity Ib. Intensity IIc. Intensity IIId. Intensity IV

21. What is the intensity of an earthquake when hanging objects swing freely?a. Intensity Ib. Intensity IIc. Intensity IIId. Intensity IV

22. Which of the following factors best refer to the magnitude of an earthquake?a. The amount of energy released by an earthquakeb. The extent of damage of an earthquakec. The vibrations on the earth’s surfaced. The falling of loose rocks

23. What is the magnitude of an earthquake that causes much damage on the land?a. Magnitude 6b. Magnitude 7c. Magnitude 8d. Magnitude 9 and over

24. Which of the following describes a landslide?a. Loose rocks falling over a mountainb. Some parts of the ground open upc. Giant waves in the oceand. Both a and b

25. Why does a tsunami occur?a. It is caused by an earthquake in a plain.b. It is caused by an earthquake under the sea.c. It is caused by a big typhoon in the land.d. Both b and c

26. Which should you observe before an earthquake?a. Stay under a sturdy table.b. Stay away from cliffs.c. Avoid touching live electric wires.d. Perform an earthquake drill regularly.

27. Which should you avoid after an earthquake?a. Condemned buildingsb. Stairsc. Elevatorsd. A valley

28. How should you behave during an earthquake?a. Keep calmb. Rush to an overcrowded exitc. Listen to the radio for the latest updated. All of the above

29. Which of the following forms a part of a volcano?a. Coneb. Ventc. Plated. Both a and b

30. How are Mt. Mayon, Mt. Pinatubo and Taal Volcano similar?a. They are active volcanoes.b. They are inactive volcanoes.c. They are found in Mindanao.d. They are all found in the Ilocos Region.

31. Which of the following statements about volcanoes is true?a. Volcanoes are mountains or hills.b. Volcanoes have vents from which smoke and magma come out.c. Volcanoes are also found under the sea.

d. All of the above.32. When is an area surrounding a volcano NOT considered a danger area? When it _____.

a. Might experience landslidesb. Might be buried in lavac. Might experience a range of earthquake shocksd. Is stable and far from the crater

33. Which of the following is a beneficial effect of volcanic eruption?a. Increased fertility of the landb. Loss of life and propertyc. Release of tremendous amounts of gases in the aird. Buried landscape

34. Why are precautionary measures observed before volcanic eruptions?a. To prevent the loss of livesb. To protect propertiesc. To pinpoint Volcanic Danger Zoned. Both a and b

35. What must the people living in Volcanic Danger Zone do before a volcano erupts?a. Listen to the latest bulletin.b. Make the necessary repairs on roofings.c. Follow government advice.d. Both a and c

36. Which government agency monitors and issues warnings on volcanic activities?a. PAGASAb. DENRc. BFMd. PHILVOLCS

37. Which of the following explains Baguio’s cold temperature?a. It is surrounded by bodies of water.b. It is located on top of a mountain.c. It is rich in mineral deposits.d. It is located in the north.

38. Why do sailors avoid the doldrums?a. Because their ships would just stay in a particular area and would not moveb. Because their ships would sail so fast that they might hit the rocksc. Because their ships would hit polar icebergsd. Both a and c

39. What kind of climate do areas surrounded by seas have?a. Very cold climateb. Cold climatec. Hot climated. Mild climate

40. What is the significance of the Coriolis effect?a. The winds move from the poles toward the equator to blowing sideward (right

side).b. The trade winds meet together in the intertropical convergence zone.c. The winds would blow toward the poles.d. Both a and b

41. Which of the following causes the winds to blow sideward?a. Unequal heating of land and waterb. The Earth’s rotation on its axisc. The different bodies of waterd. Both a and b

42. Which of the following are the seasons in the Philippines?a. Wet and dry

b. Wet and springc. Dry and falld. Wet and winter

43. Why does the Philippines only have two seasons?a. Because it is located in the temperature zoneb. Because of its latitudec. Because it has many mountainsd. Because it is surrounded by seas

44. Which causes heavy rains from June to November?a. Polar easterliesb. Southwest monsoonc. Northeast monsoond. Horse latitude

45. Why do other countries in the temperate zone experience four seasons?a. Because of the Earth’s inclinationb. Because of the Earth’s revolutionc. Because of the Earth’s rotationd. Both a and b

46. What kind of season has most leaves falling from trees?a. Summerb. Springc. Autumnd. Winter

47. Which season is similar in both hemispheres?a. Autumnb. Springc. Summerd. Winter

48. What type of climate is characterized by maximum rainfall from November to January?a. First Typeb. Second Typec. Third Typed. Fourth Type

49. What climate does Davao City have?a. First Typeb. Second Typec. Third Typed. Fourth Type

50. What factors contribute to the amount of rainfall a particular place receives?a. Location of a placeb. Kind of wind passing over itc. Type of people living in itd. Both a and b

Unit VII Beyond the Solar System1. How is the composition of stars determined?

a. By using a telescopeb. By using a spectroscopec. By using a parallaxd. Both a and b

2. Which of the following must you use to make distant stars appear closer and bigger?a. Parallaxb. Spectroscopec. Telescoped. Eyeglasses

3. Which is the most important use of radio telescope?a. It can be used to study objects too far away to be seen with ordinary telescopes.b. It can take photographs of heavenly bodies.c. It can be used to find out what chemical elements are present in the planets and

stars.d. It can be used to view a heavenly body over a long period of time.

4. Why is out Sun brighter than Sirius?a. Because the Sun is closer to us than Siriusb. Because the Sun is bigger than Siriusc. Because the Sun is hotter than Siriusd. Both a and c

5. Which of these stars is the farthest from Earth?a. Sunb. Siriusc. Alpha Centaurid. Proxima Centauri

6. Stars differ in color, depending on theira. Size and temperatureb. Size and shapec. Age and volumed. Age and shape

7. Which of the following is the hottest star?a. Capellab. Rigelc. Sund. Betelgeuse

8. How do we classify our Sun?a. white starb. yellow starc. red stard. bluish-white

9. Which is a red star?a. Averageb. Maturec. Youngd. Old

10. The color of a star depends on its __________.a. Altitudeb. Temperaturec. Sized. Both a and b

11. Which is the correct order of the star’s surface temperature, from the hottest to the coolest?

a. Red – yellow – white – bluish-whiteb. Bluish-white – red – white – yellowc. Bluish white – white – yellow – redd. White – bluish white – yellow – red

12. In what constellation is the Big Dipper found?a. Cassiopeiab. Little Dipperc. Great Beard. Lyra

13. Why are stars important to man?a. Stars tell time.b. Stars tell direction.c. Stars can predict what will happen to your life.d. A and b

14. Why is Polaris useful in sea travel?a. Polaris always points to the true north.b. Polaris makes Orion visible in the night sky.c. Polaris can be seen during the winter.d. Polaris can forecast bad weather.

15. Which of the following is a spiral galaxy?a. Large Magellanic Cloudsb. Andromedac. Milky Wayd. Both b and c

16. This galaxy comprises two to three percent of the total number of galaxies.a. Elliptical galaxyb. Spiral galaxyc. Barred spiral galaxyd. Irregular galaxy

17. What makes up a galaxy?a. Dustb. Cloudsc. Dust, gases and starsd. Stars only

18. Our solar system is a member of the _________.a. Large Magellanic cloudsb. Milky Way galaxyc. Andromedad. None of the above

19. Why do billions of stars appear as clouds or patches of light?a. Because of their great distance from the Earthb. Because of the gravitational pull of starsc. Because of the influence of other heavenly bodiesd. Because of the Sun’s radiation

20. Which instrument can view the heavenly bodies clearly and without the filtering effect of Earth’s atmosphere?

a. Radio telescopeb. Spectrographc. Space telescoped. Space colony

21. Why is a space probe better than a space telescope in exploring distant planets?a. A space probe can visit and land on a planet.

b. A space probe can take close-up photographs of distant planets.c. A space probe can measure the magnetic field and temperature of a planet.d. All of the above.

22. Why is a radio telescope an important instrument in space exploration?a. It keeps track of traveling space probes.b. It can make communication with extraterrestrial beings.c. It can receive pictures taken by space probes.d. It is affected by cloud cover.

23. How did the universe start according to the Big Bang Theory?a. As one very hot and dense ball of gasb. As one very cold and dense planetc. As small pieces of fragments of rocksd. As two big planets colliding against each other

24. American astronomers discovered recently that about two-thirds of the galaxies in the universe have somehow disappeared. Which of the three theories could possibly explain this disappearance?

a. The Big Crunch Theoryb. The Steady State Theoryc. The Big Bang Theoryd. The Nebular Theory

25. How will you describe the universe?a. Emptyb. Vastc. Limitedd. Steady

26. Which tends to support the Big Bang Theory?a. The increasing size of our Milky Wayb. The other planets being discoveredc. The path traveled by cometsd. The disappearance of stars and some galaxies in outer space

27. Why do scientists send unmanned space probes to outer space?a. It is because of possible dangers to living things.b. People might get hungry.c. People might be lonely.d. None of the above.

28. Why was Pioneer- Venus 2 sent to Venus?a. To investigate the atmosphere of Venusb. To examine the soil on Venusc. To probe the interior part of Venusd. To discover possible life forms on Venus

29. Why did man send its first space probe to the moon?a. Because the moon is the Earth’s nearest neighborb. Because the moon is a very beautiful starc. Because the moon shows some life formsd. Because the moon is very interesting

30. What space probe is considered as one of the most successful space missions/a. Vikingb. Marinerc. Sojournerd. Venera