.Comprehensive Exam inScience 6Name: ______________________________ Score: __________________

Teacher: ____________________________ Date: ___________________I. Circle the letter of the correct answer.1. What is the circulatory system? a. The body system of nerves. b. The bodys breathing system. c. The bodys food processing system. d. The bodys blood transporting system.

2. Why is oxygen important to the body? a. Oxygen helps the blood to clot. b. Oxygen brings food to the cells c Oxygen protects the body from diseases d. Oxygen is necessary for cell growth and energy.

3. Which type of blood vessel carries blood away from heart? a. veinsb. arteriesc. capillariesd. veins, arteries, capillaries

4. Why is blood that flows from the lungs to the heart bright red rather than dark red? a. Oxygen makes it red. b. Carbon dioxide makes it red. c. The nutrients present in the blood, which make it red. d. The lungs give color to the blood, which makes it red.

5. What is the main job of the white cells? a. to transport gases to and from the body. b. to fight infections and secrete antibodies. c. to supply the cells with their needed nutrients d. to clot the blood from an injured vessel or cut tissue.

6. Which of the following are called the soldiers of the body? a. plasmab. plateletsc. red blood cellsd. white blood cells

7. What would happen to people who have an open wound and whose blood did not clot naturally? a. They would bleed to death. b. Nothing. Clotting is not important. c. They would have to take clotting drugs. d. They would have to take a regular dose of plasma.

8. What is the function of the blood vessels and capillaries? a. They pump blood to the heart. b. They filter impurities from the blood. c. They carry blood to all parts of the heart. d. They carry impulses to all parts of the body.

9. Why does blood turn dark red as it circulates through the body? a. It mixes with the other substances. b. It gets carries nutrient throughout the body. c. The oxygen in it is replaced with carbon dioxide. d. The farther the blood is from the heart, the more dark red it is.

10. Which blood vessels carry oxygen-rich blood away from the heart? a. veinsb. arteriesc. capillariesd. venules

11. Which part of the brain is active when you are reading this question? a. brainstemb. cerebellumc. cerebrumd. medulla

12. Which can be controlled by the cerebellum?a. reading booksb. sharing experiencesc. listening to musicd. playing badminton

13. A cyclists occipital lobe was partly damage in an accident. What problem may occur to him? a. loss of memoryb. problem on his sight c. hearing difficultyd. difficulty on muscular movement

14. The craftsman quickly withdrew his hands when he was pricked by a needle. What part of his nervous system worked? a. cerebellumb. cerebrumc. medullad. spinal cord

15. Why is reflex action important to us? a. It keeps us away from danger. b. It helps us master our voluntary actions. c. It helps us adapt to our environment. d. It helps us to respond to harmful stimulus.

16. Which of the following is a mismatch? a. adrenal-adrenalinb. pituitary-growth hormone c. parathyroid-thyroxind. pancreas-insulin

17. A high concentration of calcium in the blood suggests a disorder of the _____. a. adrenalb. pancreasc. parathyroidd. thyroid

18. Endocrine glands that compose the endocrine system a. are present only humans b. release hormones into the bloodstream c. produce hormones that are secreted into digestive track d. release hormones as rapidly as nerve impulses are transmitted

19. During fire or emergency, people can easily carry heavy appliances or cabinets. Which hormone is responsible for this action? a. adrenalinb. insulinc. glucagonsd. thyroxin

20. A mans height is only 4ft., and he is already 20 yrs. old. His doctor told him that he suffers from dwarfism. What conclusion can you draw about him? a. His pituitary gland did not function well when he was a child. b. His pituitary gland secreted enough amount of growth hormones when he was still a boy. c. His pituitary gland secreted an insufficient amount of growth hormones while he was still a boy. d. His pituitary gland secreted over a sufficient amount of growth hormones in his childhood.

21. Where does the energy within any ecosystem come from? a. consumersb. decomposersc. producersd. sunlight

22. Scavengers are vital to recycling in an ecosystem because they eat the remains of dead inhabitants. Which of these organisms is a scavenger? a. earthwormb. fungic. hawkd. vulture

23. What is a population? a. all the biotic parts of the environment b. the total number of different species in any one area c. a group of different species in different ecosystem d. a group of individuals of the same species that live in the same ecosystem.

24. Anything that controls the growth of survival of population is referred to a. limiting factorsb. birth ratec. death rated. adaptation

25. If you study ecosystems to learn about relationships between organisms and any changes in population that take place over a long period of time, you would be a. a biologistb. an ecologistc. an economistd. a zoologist

26. Which of the following shows an evidence of a shortage of food in an overpopulated area? a. decreasing number of malnourished children b. increasing number of malnourished children c. increasing number in population of children d. decreasing number in population of children

27. What is a consumer that feed directly upon a producer? a. carnivoreb. first-order consumer c. second-order consumerd. third-order consumer

28. Which of the following animals are true hibernators? a. brown bearsb. monkeyc. vultured. rat

29. Predators such as wolves and bears are moving closer to highly populated areas, posing more danger to people. So these predators are being gathered. This can have a devastating effect, because without this natural control,_____________. a. prey will be kept in checkb. prey will also reduced c. vegetation will be overgrownd. prey will become overpopulated

30. Organisms in an ecosystem can be classified as producers and consumers. The producers provide food for the consumers. An organism that consumes both producers and other consumers is called _______________. a. a carnivoreb. a herbivore c. an omnivored. a predator

31. Food chains and food webs are models that show a visual of the different relationships within an ecosystem. The primary difference between a food chain and the food web is that ______. a. a food web shows how energy is used b. a food chain shows how energy is stored c. a food web is a complex system of food chains d. a food chain is a combination of different food webs.

32. There are many waste-reducing practices that are being suggested to lower the impact we are making on our environment. The most effective practice is ____ a. reusingb. reducingc. recyclingd. reclaiming

33. When used materials are turned into new materials like kitchen scraps placed in a compost bin, the practice being used is ________. a. reusingb. reducingc. recyclingd. reclaiming

34. An ecosystem contains __________. a. only the biotic components of the environment b. only the abiotic components of the environment c. only the energy flow component of an environment d. both the living organisms and the abiotic components

35. The clean-up crew are the decomposers. Decomposers and scavengers get rid of the wastes in an ecosystem. Decomposers differ from scavengers because they__________. a. only eat dead organismsb. do not eat dead organisms c. break down larger organismsd. only feed dead plants and animals

36. Which is not a form of symbiosis? a. commensalismb. competition c. mutualismd. parasitism

37. Which is not an ecosystem? a. grasslandb. logc. pondd. temperate forest

38. Carbon is an integral part of an ecosystem. It is cycled throughout the ecosystem as it is used and reused? It is necessary for all life to exist. carbon is used by plants in the process of ___. a. decompositionb. photosynthesis c. respirationd. transpiration

39. Pollution can cause problems within the ecosystem. The pollutants can enter the ecosystem by combining with the water vapor in the air. Their effects are felt when the become _____. a. basic and increase plant growth b. acidic and destroy the ecosystem c. acidic and cannot be decomposed d. basic and cannot be decomposed

40. Adapting to change is easier for some species than for others. A bushy area was cleared to make room for a new housing development in a city suburb. The original area was home to many species. The species likely to adapt most easily to the new habitat is the _________. a. coyoteb. foxc. rabbitd. wolf

41. How does the human population affect the ecosystem? a. Animals are conserved. b. Forests are cleared to give way to large subdivisions c. Plants and animals remained in the ecosystem d. Plants are conserved for the need of the people

42. The fisherman in the barangay use dynamites in order to have a big catch. If this practice continues, what do you think will happen to the water resources? a. Fishes will multiplyb. Marine life will increase c. Marine life will decreased. There will be no more life in the sea.

43. Living beyond our means can have a devastating effect on our environment. Therefore, the impact we make determines our _________. a. sustainabilityb. consumer bias c. ecosystem balanced. ecological footprints

44. One way of changing our impact on the environment we live in is to____. a. pack our garbage in a smaller bag b. be aware of all the resources use c. use a car instead of taking the bus to get to work d. take a bath every day instead of just showering

45. Rapid population growth upsets the ecological balance of the Philippines. Which of the following proves this? a. minimum use of space b. decrease of food and water supplies c. increase in the need for food, water, and space d. demand for food, water, and space remained as they are.

46. What change happens when liquid evaporates? a. solid to gasb. liquid to gasc. gas to liquidd. liquid to solid

47. Evaporation plays some important role resulting to a new product. The following are the uses of evaporation, except a. cooling of perspiration in the skin b. distillation of alcoholic beverages c. production of salt from the sea water d. Formation of precipitate like rain and snow

48. Mother pours some juice in a glass with ice. After some time, water droplets appeared outside the glass. How do droplets of water form in the glass? a. Droplets are formed when water in the glass spilled. b. Droplets are formed when water molecules condense on the outside of the glass c. Droplets are formed when the ice melted and the liquid overflowed d. Droplets are formed when water in the glass changes to gaseous molecules

49. Anna poured some vinegar into a bottle. She added some baking soda and covered the mouth of the bottle with a balloon. After the chemical reaction, the balloon inflated. What caused the balloon to inflate? a. formation of precipitateb. evolution of carbon dioxide c. formation of milky substanced. combination of two substances

50. Burning of gasoline in a car requires chemical change. The carbon dioxide formed from this reaction affects the environment. What environmental problem occurs if too much carbon dioxide is present in the atmosphere? a. acid rainb. air pollutionc. global warmingd. ozone depletion

51. When gaseous pollutants in the air react with water vapor so that acid rain is formed. The following are evidences that the rainfall in your place contains acid except__________. a. Concrete structures decay after sometime. b. Materials made of metals corrode after sometime c. Plant biodiversity increases d. Fish and aquatic plants in the seas and lakes die52. Which of the following help reduce global warming? a. fossils fuelsb. ozone layer c. greenhouse effect d. use of refrigerants

53. Which is a physical change? a. air pollutionb. ozone depletion c. evaporation of waterd. formation of acid rain

54. Which products do not belong to only one category? a. paints, varnish, pesticides, vehicle fluid b. cereal, ice creams, preserves, condiments c. perfume, lotion, toothpaste, cologne, make-up d. bleach, detergent, liquid soap, shampoo, dishwashing paste

55. You read word Flammable on a product label of insecticides. What does it mean? a. The product should be kept away from fire b. The product should be placed in the kitchen c. The product should be used near the source of fire d. The product should be placed in the medicine cabinet

56. You want to use medicines to clean your wound. Which will tell you until when is the product safe and effective to use? a. expiry dateb. brand namec. manufacturerd. direction for use

57. Pesticides and insecticides are highly toxic chemicals. How will you use them? a. They should be used sparingly b. They should be used externally c. They should be used with caution d. They should be mixed with other products

58. Flavor en hankers are food additives that improve the taste of food. Which flavor enhancer is usually used at home? a. emulsifierb. sweetenerc. thickenersd. monosodium glutamate

59. Which of the following does not show the proper way of storing materials? a. Store food products away from walls and floors b. Use cracked, ripped containers in storing food c. Keep or store flammable containers away from heated areas d. Store chemicals in cabinets that cannot be reached by children

60. Father used pesticides to kill the insects in his garden. Which should NOT be practiced by him in using pesticides? a. Mix pesticides away from anybody b. Keep pesticides in their original container c. Use bare hands in keeping the pesticides d. Wear a gas mask and gloves in handling pesticides

61. The energy of moving object is a. chemical energyb. kinetic energy c. nuclear energyd. potential energy

62. Which of the following is not an example of kinetic energy being converted to potential energy? a. releasing of arrow b. releasing a compressed spring c. pulling in the rice field d. basketball player jumping for a rebound

63. Which energy transformation occurs in an electric iron? a. heat to lightb. light to heatc. heat to electricity d. electricity to heat

64. Which type of energy uses magma or hot dry rocks to generate electricity? a. hydroelectricb. geothermalc. nucleard. solar

65. Which of the following is not use of sound energy? a. Sound is used to map ocean floor. b. Sound helps track earthquakes. c. Sound is used to generate electricity. d. Sound is used to see internal organs.

66. Which of the following shows that chemical energy is changed to mechanical energy? a. lightning of candleb. switching on of flashlight c. using sunlight to dry up clothesd. an athlete run after drinking water.

Carefully review the table and use this in answering the questions.66-69.Types of Heat Transfer

TypeExampleTransfer Method

ConductionStove heating the panParticle collision

RadiationSunElectromagnetic waves

Natural convectionBoiling waterParticle movement from area to area

Forced convectionFurnace fanParticle movement from area to area

67. Based on the table, heating a pot of water on a stove until it boils would demonstrate ___________. a. radiation and conduction b. natural convection and conduction c, conduction and forced convection d. natural convection and forced convection

68. The pupils are studying outside on a sunny day. They noticed that they feel warm after sometime. What type of heat transfer occurs? a. conductionb. radiation c. forced convection d. natural convection

69. Mother placed a thick curtain on the window during summer to minimize the entrance of heat. Which type of heat transfer did she consider? a. conductionb. radiation c. forced convection d. natural convection

70. Which of the following statements is true? a. Friction makes an object slide. b. Gravity pushes object upward c. Force is needed to stop an object. d. An object in motion will remain in motion.

71. Why does a car travel faster in going down than in going up? a. It is moving away against gravity. b. It is being pushed by the wind. c. It is moving towards gravity. d. It is being pulled by the weight of the car.

72. Which layer is composed of the igneous rock called granite? a. mantleb. oceanic crustc. continental crustd. core

73. Why is the earth like an avocado? a. because of its useb. because of its color c. because of its shaped. because of its structure

74. Which layer of the earth man has penetrated? a. crustb. mantlec. outer cored. inner core

75. Depression is to plain; while elevation is to __________________. a. mountainsb. plainsc. seasd. valleys

76. Where is the lowest point on earths crust? a. Philippine Deepb. Mid Atlantic ridge c. Marianas Trenchd. Mid Ocean ridge

77. Which rock has large mineral grains? a. basaltb. granitec. pumiced. obsidian

78. How are igneous rock formed? a. melting rocksb. weathering of rocks c. cooling of lavad. heat and pressure

79. Which sedimentary rock is formed when clay and mud undergo compaction and cementation? a. conglomerateb. sandstonec. shaled. limestone

80. How do scientist study the earths interior? a. through the kinds of rocksb. through the flowing lava c. through the seismic wavesd. through the movement of plates

81. Which of the following is an agent of mechanical weathering? a. oxidationb. leachingc. carbonic acidd. animal burrowing

82. In which region is chemical weathering most rapid? a. cold and dryb. cold and moist c. warm and dryd. warm and moist

83. Which is used to measure magnitude of an earthquake? a. Mercalli scaleb. Seismograph c. Richter scaled. Tilt

84. What is earthquake intensity? a. a measure of seismic riskb. a measure of energy released c. a measure of damage doned. a measure of an earthquake focus

85. What type of boundary is associated with composite volcano? a. plates collecting togetherb. plates moving apart c. plates sticking and slippingd. plates sliding past each other

86. What kind of magma produces violent eruptions? a. those rich in silicab. those that are fluid c. those in rich in irond. those forming shield volcano87. Which of the following forms when the top of a volcano collapses into a partially emptied magma chamber? a. calderab. craterc. fissured. volcanic rock

88. Which of the following should not be done during an earthquake when you are inside the building? a. Rush to the doors and get in an elevator. b. Be aware of the possibility of open electrical lines. c. Seek shelter in a doorway or take cover under a heavy table or desk. d. Open the window and leave the building immediately when you smell gas.

89. Which of the following statement is NOT true? a. Stars differ in size.b. Red stars are the hottest stars. c. Supernovas are exploding stars.d. The sun is a medium-sized yellow star.

90.Which of the constellation does NOT belong to the group? a. Aquariusb. Orionc. Piscesd. Scorpio

91. Why does the sun appear bigger than the other stars? a. It has yellow light. b. It is bigger than the other stars. c. It is nearer the earth than the other stars. d. It has higher temperature than the other stars.

92. Which constellation can help a traveler find the south sky at nighttime? a. Andromedab. Cassiopeiac. Cruxd. Orion

93. You want to find the North Star or Polaris in the north sky, which shape of the constellation will help tell you find the North Star? a. crossb. letter wc. small dipperd. big dipper

94. Why does the sun outshine other stars? a. It has yellow light. b. It is bigger than the other stars. c. It is nearer the earth than the other stars. d. It has a higher temperature than the other stars.

95. Which constellation can help a traveler find the North pole without a compass? a. Andromedab. Cassiopeiac. Cruxd. Orion

96. Why are some constellation visible only during a certain season? a. The earth rotates on its axis. b. The earth revolves around the sun. c. The moon revolves around the earth. d. The other constellations are far from the earth.

97. Why do sunspots appear dark? a. They produce low intensity of light. b. They have lesser amount of nuclear energy. c. They are not as bright as the other part of the sun. d. They are cooler than the surrounding region of the photosphere.

98. What is the English name of constellation Aquarius? a. Andromedab. Water bearerc. Crabd. Ram99. What is the constellation of the English name Virgin? a. Virgob. Bullc. Liond. Twins

100. The Laplanders, together with their flock of sheep, travel south because they notice that the Sagittarius constellation appears in the sky. What season do you think it is? a. autumnb. summerc. springd. winter

Comprehensive Exam inScience 4Circle the letter of the correct answer.

1. What might happen to a broken bone if it was not put in place by a splint or a cast?a. It might heal crookedly.b. It might be broken again.c. It might not work properly.d. it might not heal anymore.

2. How are treatments for strains, sprains, and fractures alike?a. All treatments need to be operated at once.b. All treatments must allow the injured parts to rest.c. All treatments must be done by a physician.d. All treatments are expensive.

3. What fills the hollow part of a bone?a. bloodb. nutrientsc. marrowd. water

4. Which of the following connects a muscle to a bone?a. cartilageb. ligamentc. jointd. tendon

5. What disorder is it when a bone is broken but the skin is not?a. simple fractureb. compound fracturec. greenstick fractured. comminuted fracture

6. Which joint allows sliding and twisting movement?a. gliding jointb. pivot jointc. hinge jointd. ball-and-socket joint

7. Which nutrients supply your muscles with energy?a. vitamins b. proteinc. calciumd. carbohydrates

8. Which division of the skeleton is composed of the head and the trunk?a. axialb. appendicularc. vertebral columnd. thorax

9. The strong, flexible tissue that protects the ends of bones, where they meet other bones are called _______________.a. cartilageb. ligamentsc. marrowd. tendons

10. The shoulders, the arms, the forearms, the wrists, the hands, and the fingers are all part of the _____________.a. axial skeletonb. lumbar skeletonc. vertebral skeletond. appendicular skeleton

11. Which of the systems work together to make the body move?a. Digestive and Skeletal Systemsb. Muscular and Digestive Systemsc. Skeletal and Muscular Systemsd. All of the three systems

12. A boy stretches his arms. In which part does the muscle contract?a. lower part of the bodyb. upper part of the bodyc. muscles of the faced. muscles of the intestine13. What is the main function of the muscular system?a. contractionb. coordinationc. stretchingd. relaxing

14. Which of these muscles can you not control?a. muscle of the feetb. muscle of the heartc. muscle of the neckd. facial muscle

15. Renz stops playing basketball. He complains about numbness and pain on his leg. What is Renz suffering from?a. arthritisb. crampsc. fractured. sprain

16. Which of these minerals is needed by your bones?a. calciumb. carbohydratesc. proteind. vitamin A

17. Which of the following diseases of the muscles is caused by toxins released by bacteria?a. crampsb. spasmsc. strainsd. tetanus

18. Which of the following health habits is good for the muscles?a. Eat food that are low in fat and high in fiber.b. Eat food that are high in fat and low in fiber.c. Eat food that are oily and fatty.d. Eat food that is rich in vitamin A.

19. What kind of exercise helps the heart and lungs?a. bowlingb. weight liftingc. aerobicd. anaerobic

20. Which is not a work of the muscle?a. It covers and protects the bones.b. It gives shape to the body.c. It helps the bones move.d. It supports the body.

21. What makes biscuits sweeter after chewing it for sometime?a. adrenalinb. bilec. insulind. ptyalin

22. What movement pushes the food from the esophagus to the stomach?a. flowingb. peristalsisc. runningd. shaking

23. Which ailment is characterized by decaying tissues in the stomach?a. constipationb. diarrheac. stomach ached. ulcer

24. What process changes the food you eat into a soluble material to be used by the body?a. digestionb. inhalationc. reproductiond. respiration

25. Gary Valenciano is suffering from diabetes mellitus because of lack of insulin. Which of his organs is affected?a. liverb. pancreasc. oil glandd. salivary gland

26. Justine experienced soft, watery feces. What kind of ailment is she suffering from?a. stomach acheb. constipationc. diarrhead. ulcer

27. Where does digestion start?a. stomachb. mouthc. small intestined. large intestine

28. Which is the first step in the mechanical digestion of food?a. eatingb. chewingc. bitingd. swallowing29. It is an opening where waste goes out of the body.a. anusb. mouthc. teethd. tongue

30. it is a tube where food passes to get to the stomach.a. tongueb. stomachc. mouthd. esophagus

31. What process does an animal undergo when the sperm and egg cell unite?a. fertilizationb. hatchingc. reproductiond. life cycle

32. In which of these stages is the young insect resting?a. eggb. larvac. pupad. adult

33. After observing the pond in your garden for a week, you found out that there were tiny moving objects in the water. Where do you think did these objects come from?a. mosquitoesb. butterfliesc. dragonfliesd. flies

34. The poisonous substance that comes from snakes, spiders, and scorpions is called_______.a. venomb. pollenc. chemicald. enzyme

35. What kind of disease is given by mice?a. rabiesb. malariac. dengued. bubonic

36. Which of the following animals is born alike its parents?a. dogb. frogc. grasshopperd. butterfly

37. Which is the correct order of the life cycle of a butterfly/a. pupa, egg, larva, adultb. adult, egg, larva, pupac. egg, larva, pupa, adultd. larva, pupa, egg, adult

38. Which is the fourth stage in the butterflys life cycle?a. adultb. eggc. larvad. pupa

39. They eat the wood in houses and buildings.a. cockroachesb. housefliesc. mosquitoesd. termites

40. Why should you handle animals with care?a. Some animals are mans best friend.b. Some animals help us in many ways.c. Some animals are disease carries.d. Some animals safeguard our homes.

41. The tiny part of a seed that can grow into a new plant is called ________________.a. embryob. ovaryc. ovuled. pistil

42. Butterflies help pollinate flowers by _____________________.a. carrying nectarb. eating the pollenc. scattering seedsd. carrying pollen from one flower to another.

43. Flowers like sunflowers make large amounts of tiny light pollen grains that are mostly pollinated by ____________________.a. the windb. animalsc. humand. insects

44. What is the colorful part of flowers that protect the flower parts where seeds are made?a. petalsb. pistilc. sepalsd. stamen

45. Two parts of a flower needed to make a seed are the _______________.a. pollen and beesb. pistil and petalsc. stamen and pistild. light and eggs

46. Which of the following plants is grown from a bulb?a. onionb. gingerc. potatod. kangkong

47. Where does the seed get its food supply?a. cotyledonb. embryoc. endospermd. radical

48. When does fertilization occur?a. when the pollen tube grows largerb. when the pollen grain swellsc. when the pollen grain falls on the stigmad. when the sperm unites with the egg cell inside the ovule

49.The inner part of an ovary that contains an egg is the ________________.a. pollenb. pistilc. stamend. ovule

50. Which of these Artificial Vegetative Reproduction that is done by removing a portion of the bark of a healthy stem.a. Marcottingb. Graftingc. Buddingd. Cutting

51. If you have a mixture of iron filings and sawdust, how will you separate them?a. by using a magnetb. by dissolvingc. by pickingd. by sifting

52. In which liquid is nail polish soluble?a. alcohol b. acetonec. oild. water

53. An easy way to separate oil and water is through ___________.a. decantationb. evaporationc. freezingd. filtration

54. Why is water called the universal solvent?a. It has forceb. It is easily availablec. It has strong chemicalsd. It can dissolve different materials

55. Which of the following is a mixture of different gases?a. airb. mineralc. oild. water

56. Why are the combinations of food called mixtures?a. Because their components are mixed.b. Because their components are not joined chemically.c. Because their components are joined chemically.d. Because their components are made up of different materials.

57. What will happen to the components of vinegar and oil when mixed together?a. Their components will float.b. Their components will sink.c. Their components will stay the same. d. The components of oil will settle in the upper part.

58. Which form a homogenous mixture?a. water and soilb. sugar and waterc. sand and waterd. sand and iron filings

59. When the solvent has already dissolved all the solute it can, the mixture has reached its ____.a. boiling pointb. melting pointc. freezing pointd. all of the above

60. Which represents a suspension?a. oil and vinegar dressingb. water and coffeec. milk and coffeed. milk and water

61. Which of these statements about friction is not true?a. Friction can increase motion.b. Friction can also decrease motionc. Friction is less on smooth surfaced. Friction moves objects at rest.

62. Which of the following objects can decrease friction?a. lubricantb. rough surfacesc. groves of tiresd. rubber soles

63. What makes your palm hot when you rub them together?a. physical changeb. chemical changec. insulatorsd. friction

64. Which situation will show heat transfer by radiation?a. ironing of clothesb. roasting chickenc. boiling of waterd. sunbathing during summer

65. Which of the following situations shows spontaneous combustion?a. chewing of foodb. food-making of plantsc. tarnishing of spoonsd. firecracker explosion

66. Which is the correct sequence to produce fire?a. oxygen, heat, fuel b. fuel, oxygen, heatc. wood, paper, match d.heat,light,fuel 67. How does heat travel in liquids and gases?a. convectionb. conductionc. radiationd. evaporation

68. Why is it better to use a wooden handle for a cooking utensil?a. Heat cannot transfer in a wooden handle.b. heat is produced in a wooden handle.c. Heat can transfer easily in a wooden handled. Heat is produced easily in a wooden handle

69. Which of these statements is a safety measure for preventing fire?a. Throw combustible materials anywhere.b. Store inflammable materials near the cooking area.c. Panic in order to remember what to do.d. Provide your homes with enough supply of water and a fire extinguisher.

70. What is our main source of heat?a. Sunb. Moonc. Planetc. Stars

71. Erosion will take place very rapidly in ____________________.a. farmlandsb. curved surfacesc. flat surfacesd. steep surfaces

72. Who are greatly affected when soil erosion happens?a. Animals and plantsb. Plants and peoplec. people and animalsd. Planting more trees and grasses

73. Which has the biggest effect in preventing soil erosion?a. Burning treesb. Cutting down of treesc. Overgrazing of plantsd. Planting more trees and grasses

74. If you want to grow vegetative plants in your garden, what type of soil is the best to use?a. clayb. loamc. sandyd. any type

75. How does wind erode soil?a. Wind makes the soil dry.b. Wind makes the soil wet.c. Wind carries the soil awayd. Wind changes the soil into dust.

76. What is a bed cracked by glacier?a. Ice erosionb. Wind erosionc. Water erosiond. gravity erosion

77. Which agent of erosion is a small particles of soil are moved to another place?a. Ice erosionb. Wind erosionc. Water erosiond. gravity erosion

78. What are clouds primarily made of ?a. mistb. waterc. water vapord. tiny droplets of water

79. The measurement of the hotness and coldness of the air is called?a. humidityb. pressurec. temperatured. velocity

80. When Erica looks out the window, she observes that nimbus clouds are present in the sky. This indicates that there will be ___________________.a. rainb. fair weatherc. strong windsd. thunder and lightning

81. You are in a place where there are no weather instruments to use, but you would like to know the direction of the wind and its speed. What is the best thing to do?a. Observe the plantsb. Observe the cloudsc. Observe the animalsd. Observe the people around

82. A fisherman plans to go to the ocean to catch fish. He notices that it is about to rain. This shows that the weather affects the ___________________________.a. activities we do.b. clothes we wearc. games we playd. food we eat

83. What is the Chinese term of the word Typhoon?a. tai fungb. fung taic. tai peid. fung pei

84. What is the daily condition of the atmosphere?a. Weatherb. climatec. raind. typhoon

85. What is the example of precipitation?a. rainb. heatc. starsd. moon

86. Who is a person who studies the weather?a. meteorologistb. botanistc. zoologistd. geologist

87. What weather instrument is used to find out how fast the wind blowing?a. anemometerb. barometerc. thermometerd. hygrometer

88. What is the frozen water vapor?a. Snowb. rainc. haild. sleet

89. What is the mixture of smoke and fog that occurs in polluted area?. a. fogb. smogc. raind. dew

90. What is the process of growing tall and short crops in alternate strips to break the wind?a. Strip Croppingb. Soil Tillingc. Terracingd. Contour Plowing

91. What is the orbital shape of the earth as it moves around the sun?a. circularb. ellipticalc. rectangulard. triangular

92. How long does it take the earth to rotate on its own axis?a. 24 minutesb. 24 hoursc. 24 daysd. 24 months

93. How long does it take the earth to make one complete revolution around the sun?a. one dayb. one weekc. one monthd. one year

94. What causes day and night?a. suns rotationb. earths rotationc. moons rotationd. earths revolution

95. When do tides occur?a. when the earth pulls the sun.b. when the sun pulls the earthc. when the earth pulls the moond. when the moon pulls the earth.

96. When does a solar eclipse occur?a. when the moon is at full moon phase.b. when the sun is between the moon and the earth.c. when does a solar eclipse occur.d. when the moon is in a starlight line between the sun and the earth.

97. What is according to scientists is causing damage to the ozone layer?a. Carbon dioxideb. Chemical pollutionc. Solar flaresd. Ultraviolet rays

98. Which is the most distant planet in our solar system?a. Jupiterb. Neptunec. Plutod. Uranus

99. Who discovered the worlds most famous comet?a. Edmond Halleyb. Galileo Galileic. Neil Armstrongd. David Scott

100. What is the largest asteroid in the solar system?a. Ceresb. Comac. Encked. Halley