LET Reviewer -General Education-Natural Science Part-6 (50 Items)
NATURAL SCIENCE (6)
1) Which of the following BEST demonstrates the greenhouse principle?
a. A heated aquarium
b. A car with rolled-up windows
c. A microwave oven
d. A solar battery-powered calculator
2) Which law of force and motion explains this occurrence, when a rocket is propelled upward by the powerful downward discharge of exhaust gases? a. Universal Gravitation
b. Action and Reaction
c. Applied Force
d. Inertia
3) Why does a pendulum in a grandfather clock once set in motion continue to swing, thereby regulating the clock's movement? This is due to the Law of:
a. Universal Gravitation
b. Action and Reaction
c. Applied Force
d. Inertia
4) Why does a bullet when discharged into the air eventually fall to the ground? This is due to the Law of:
a. Universal Gravitation
b. Applied Force
c. Inertia
d. Action and Reaction
5) Which of the following will occur if a cold bottle of soda is left open on a kitchen counter?
a. The pressure that the soda exerts on the bottle will increase.
b. The temperature of the soda will decrease.
c. The amount of dissolved carbon dioxide gas will decrease.
d. The amount of dissolved carbon dioxide gas will remain the same.
6) In an experiment, a drop of blue ink is placed on the surface of a glass of water. In a few minutes, the drop of ink is dispersed throughout the water, turning it light blue. The result of the experiment proves that:
a. molecules of ink and molecules of water are in constant motion.
b. heat causes the ink to disperse.
c. a new compound is formed by the combination of ink and water.
d. ink molecules have less density than water molecule.
7) Each of the following objects is designed to employ the buoyancy principle, EXCEPT:
a. life preserver
b. kite
c. submarine
d. canoe
8) An elderly woman suffered a stroke, a restriction of blood flow to the brain. If the stroke caused to the right side of her body to become temporarily paralyzed, she most likely experienced a decreased blood flow to:
a. the left side of her body
b. the front of her brain
c. the left side of her brain
d. the right side of her brain
9) In an experiment, a vacuum is created when all air is removed from a tube. A coin and bits of confetti are released in the vacuum at the same time. They fall at the same rate and reach the bottom at the same time. The experiment proves that
I. in a vacuum, the rate of acceleration is the same for all objects regardless of weight.
II. outside a vacuum, air resistance is what makes different objects fall at different rates.
III. gravity has no effect at all on objects that fall in a vacuum.
a. I and II
b. I and III
c. I, II and III
d. II and III
10) New peonies, perennial plants that produce showy flowers can be propagated from the parent plant by dividing corns that grow underground. This reproductive form resembles a:
a. bulb
b. runner
c. seed
d. bud
11) Which antidote would have a similar effect if vinegar or citrus juice were not available?
a. Milk
b. Raw egg white
c. Vegetable oil
d. Water
12) Which is NOT among the hazardous effects of water pollution to health?
a. The epidemic threat of hepatitis and dysentery.
b. The increase incidence of liver cancer.
c. The dumping of mercury in the sea causing blindness, brain damage, or death.
d. The presence of certain bacteria in the digestive tract causing methemoglobinemia.
13) A tightly coiled spring demonstrate?
a. Steam energy
b. Kinetic energy
c. Potential energy
d. Chemical energy
14) Which of the following methods can all diabetics control their condition and avoid heart disease and blindness?
I. Regulating their intake of glucose
II. Increasing the levels of insulin in the body by taking insulin injections
III. Maintaining a reasonable exercise regimen to keep weight down
a. I
b. II
c. I and II
d. I and III
15) The invention of telescope is very significant because:
a. It brightens the light coming from the stars.
b. It analyzes the composition of the planet.
c. It allows the observations of far objects.
d. It determines the age of the stars.
16) Which scientist paved the way for modern exploration by advancing the theory that planets revolve around the sun:
a. Ptolemy
b. Aristotle
c. Copernicus
d. Harvey
17) Rottenstone, rouge, and whiting are used for _______.
a. polishing
b. sterilizing
c. cleaning
d. filling porous wood surfaces
18) The amount of light entering the eye is controlled by the ________.
a. optic nerve
b. cornea
c. iris
d. retina
19) The one that produces the quickest heat energy per pound is ________.
a. bread
b. roast beef
c. fried chicken
d. fish with butter
20) The statement that a buoyant force on a floating body is equal to the weight of fluid displaced is known as the principle or law of ________.
a. Boyle
b. Newton
c. Archimedes
d. Bernoulli
21) Flowers that have no fragrance are usually pollinated by ________.
a. insects
b. wind
c. birds
d. small animals
22) Scientist tend to replicate the measurements during an experiment. The main reason behind this is for them to?
a. estimate the experimental error
b. list the data in a tabulation
c. change the experimental conditions
d. find out if the equipment is working
23) Arrange the following steps in the most logical order of scientific investigation.
I. Formulate the hypothesis
II. Perform the experiment
III. State the problem IV. Draw the generalization
a. III, II, I, IV
b. III, IV, II, I
c. III, I, II, IV
d. III, II, IV, I
24) Roger and Henry are doing their experiments; both use the same kind of materials, same amount of different liquids, and same place where they performed their experiment. What is the variable in
the experiment?
a. Bottles
b. Amount of liquid
c. Kind of liquid
d. Place of experiment
25) What is the importance of control set-up in experimentation?
a. It will identify the variables in the experiment.
b. It will provide a basis of comparison between treated and untreated subjects.
c. It will provide a basis for measuring data.
d. It will eliminate mechanical errors in experimentations.
26) Linda formulated a hypothesis that anthurium flower will grow larger if fish bone is added to the soil. She has two experimental plots of anthurium, one with fish bone and the other without fish bone. Which data should she be collected to support this hypothesis?
a. Height of anthurium plant in both plots.
b. Length of growing time in both plots.
c. Size of anthurium flower in both plots.
d. Amount of fish bone in both plots.
27) The process of comparing one quantity with the corresponding standard is called ________.
a. Measurement
b. Formulation
c. Interpolation
d. Extrapolation
28) Which of the following relationships is CORRECT?
a. A meter is less than a kilometer.
b. A second is more than a minute.
c. A centigram is equal to a milligram.
d. A decimeter is greater than a decameter.
29) Matter is anything that has ________.
a. weight and volume
b. mass and volume
c. weight and mass
d. mass and shape
30) A student walks from home to school 3 blocks away and then returns home for lunch. After lunch, he goes back to school. His total displacement is ________.
a. 0 blocks
b. 3 blocks
c. 6 blocks
d. 9 blocks
31) Which description below shows the fastest runner?
a. The one with the longest recorded time.
b. The one with the farthest distance travelled.
c. The one with the farthest distance travelled at longer recorded time.
d. The one with the farthest distance travelled at shorter recorded time.
32) What property of matter is involved in the sign, "Fasten Your Seat Belt"?
a. Acceleration
b. Inertia
c. Interaction
d. Impenetrability
33) Two items of similar shapes and weights are dropped simultaneously from a ten-storey building. Which of the following statements is CORRECT about the falling rate (acceleration) of the objects?
a. The weight of the objects has no effect on the falling rate.
b. The shape of the objects has a minor effect on the falling rate.
c. The resistance of the air has no effect on the falling rate.
d. The distance of the fall has an effect on the falling rate.
34) Which laboratory equipment/s is/are used to find whether a ring is genuine or fake?
I. Platform balance
II. Graduated cylinder
III. Beaker
a. I only
b. II only
c. I and II only
d. I, II and III
35) Which of the following situations is true as a boat moves from salty sea to fresh water river?
a. It sinks deeper
b. It floats higher
c. It stays at the same level
d. It moves faster
36) Which of the following is conserved when a pendulum is swinging?
a. Mass
b. Momentum
c. Energy
d. Weight
37) Which statement best explains why ice is a good refrigerant?
a. It cools by evaporation.
b. It absorbs heat while melting.
c. It conducts heat quickly.
d. It does not melt inside the rerigerator.
38) An object becoomes positively charge if it ________.
a. gains protons
b. gains electrons
c. loses protons
d. loses electrons
39) Atoms consist of three fundamental particles. What are these particles and their charges?
a. proton (-), neutron (+), electron (neutral)
b. proton (+), netron (-), electron (neutral)
c. proton (+), neutron (neutral), electron (-)
d. proton (-), neutron (neutral), electron (+)
40) Which element in the periodic table has the Symbol "Ca"?
a. Cadmium
b. Calcium
c. Carbon
d. Californium
41) Ions are formed by ________.
a. gaining or losing electrons
b. gaining or losing protons
c. sharing protons
d. sharing electrons
42) All of the following are charcteristics of metals, EXCEPT ________.
a. good conductor
b. brittleness
c. malleability
d. ductility
43) Which is true about metalloids?
a. Have properties of both metals and non-metals.
b. Conduct electricity better than metals.
c. Conduct heat better than metals.
d. Conduct heat and electricity less effective than non-metals.
44) Which of the following is an element?
a. Water
b. Ethanol
c. Neon
d. Crude Oil
45) In a flame test, what is the color of the flame if there is a presence of boron in a solution?
a. Brick red
b. Yellow gold
c. Royal blue
d. Bright green
46) Which warning label indicates
a chemical property of the aterial being labelled?
a. Fragile
b. Handle with care
c. Shake well
d. Flammable
47) Which of the following is an example of a chemical change?
a. Melting of candle
b. Rusting of iron
c. Dissolving sugar
d. Boiling of water
48) A change in state from solid to gas without passing the liquid state is called ________.
a. Solidification
b. Evaporation
c. Condensation
d. Sublimation
49) The radiosotope which is now used in cancer radiation treatment is ________.
a. Cobalt 60
b. Uranium 238
c. Sodium 24
d. Iodine 131
50) Which radioactive radiation coming from external sources is most dangerous to human body?
a. X-rays
b. Alpha radiation
c. Beta radiation
d. Gamma radiation
NATURAL SCIENCE (6) ANSWERS:
1. B
2. C
3. D
4. A
5. C
6. A
7. B
8. C
9. C
10. C
11. A
12. B
13. C
14. D
15. C
16. C
17. A
18. C
19. A
20. C
21. B
22. A
23. C
24. C - All the factors given in the experiment do not change except for the kind of liquid as indicated by the phrase "different liquids."
25. C
26. C
27. A
28. A
29. B
30. B - Displacement is a vector, so the direction is also to be considered. When the student returns home, the 3 blocks displacement is cancelled and going back to school will give 3 blocks.
31. D
32. B
33. A
34. C
35. A
36. C
37. B
38. D
39. C
40. B
41. B
42. C
43. A
44. C - Ethanol and water are compounds while crude oil is a mixture.
45. D
46. D
47. B
48. D
49. A
50. D
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