LET Reviewer - GenEd - Natural Science (40 Items)
NATURAL SCIENCE (1)
1) Parkinson’s disease is a brain disease which is characterized by loss of nerve cells in which part of the brain?
a. Cerebrum
b. Cerebellum
c. Cerebral Cortex
d. Brain stem
2) Symbiosis is defined by biologists as individuals of different species living together in intimate association, regardless of whether the association is harmful, neutral, or beneficial. All of the following pairs are examples of symbiosis EXCEPT:
a. ants and aphids
b. human and tapeworms
c. cats and mice
d. dogs and cats
3) Which of the following statement about atomic structure is NOT right?
a. All atoms of the same atomic numbers are atoms of the same element.
b. An atom can gain or lose electrons without changing its charge.
c. Atoms are mostly empty space.
d. Most of the mass of the atom is concentrated in its nucleus.
4) Which of the following statements is TRUE of nuclear fission?
a. The energy process is identical to that which occurs in the sun.
b. Energy is obtained by getting nucleus of the atoms to break up or split.
c. Matter from the lighter atoms is changed into energy.
d Scientists can combine lighter atoms to form heavier atoms.
5) All of the following statements about the routinary use of pesticides are TRUE, EXCEPT:
a. Due to the widespread use of DDT, a new type of housefly emerged.
b. It results in the evolution of exciting new types of organisms.
c. It may not only kill the intended insects but also those that feed on them.
d. Pesticides tend to become progressively less effective as the organisms become immune.
6) The skull of a person increases in size rapidly during ________.
a. puberty
b. babyhood
c. adolescence
d. adulthood
7) Apparently, the loss of weight of objects immersed in a fluid is due to ________.
a. Archimedes principle
b. Specific gravity
c. Newton’s theory
d. Buoyant force
8) Metabolism and combustion are chemically similar. They both result in the oxidation of some compounds. If completely oxidated, which of the following foodstuffs would yield the MOST thermal energy?
a. A cup of ice cream
b. A cup of sugar
c. A cup of milk
d. A cup of flour
9) In countries where medical skill and public understanding about health and disease are widespread, which of the following changing are evident?
I. Accidental deaths have decreased.
II. The communicable disease death rate has decreased.
III. Infant mortality rate has decreased.
IV. More people live a full life
V. People live along enough succumb to degenerative disease.
a. I, II, III
b. II, III, IV, V
c. I, II, III, IV, V
d. I, II, III, IV
10) Which of the following parts of the circulatory system carries digested fats away from the small intestines?
a. Pancreatic duct
b. Arterial capillaries
c. Pulmonary artery
d. Lacteals
11) During processing and cooling which part of food is mostly destroyed?
a. Fats
b. Proteins
c. Vitamins
d. Carbohydrates
12) When water evaporates, it changes into which of the following states?
a. Solid
b. Matter
c. Gaseous
d. Liquid
13) Which of the following statements is NOT TRUE about comets?
a. Comets are mostly frozen gases and cosmic dust.
b. Comets glow by their own light.
c. Comets generally have elongated elliptical orbits.
d. Comets may go around the sun in any direction.
14) What is the first element in the periodic table?
a. Helium
b. Hydrogen
c. Oxygen
d. Carbon
15) A change in the shape or size of an object can be classified as ________.
a. mechanical change
b. physical change
c. nuclear change
d. chemical change
16) In what state are most matter in the universe?
a. Gas
b. Liquid
c. Solid
d. Plasma
17) Two glass tumblers that are stuck one inside the other may be loosened by –
a. pouring cold water on the outside tumbler after filling the inside tumbler with equally cold water.
b. pouring hot water on the outside tumbler after filling the inside tumbler with equally hot water.
c. pouring cold water on the outside tumbler after filling the inside tumbler with hot water.
d. pouring hot water on the outside tumbler after filling the inside tumbler with cold water.
18) A thermometer measures _________.
a. energy
b. heat
c. pressure
d. temperature
19) What is the color of the hottest star in the universe?
a. red
b. blue
c. yellow
d. orange
20) Which of the following forms of energy travels in waves?
a. Chemical energy
b. Sound energy
c. Light energy
d. Electrical energy
21) A British physician and bacteriologist, Sir Ronald Ross was awarded the Nobel Prize in medicine for his researches in the _________.
a. liquid fuel rocket
b. prevention of hepatitis
c. transmission of malaria
d. control of cholera
22) When lighted, the energy of the alcohol in a lamp is?
a. lost while heating is done.
b. transformed from chemical to mechanical energy.
c. transformed from chemical energy to heat energy.
d. completely destroyed.
23) Which process occurs solid is changed into gas?
a. Evaporation
b. Condensation
c. Sublimation
d. Decomposition
24) The first Filipino who was declared as a natural scientist and who has contributed much in discovering local plants that can be use as medicine is ________.
a. Dr. Pacifico Marcos
b. Dr. Henry Moseley
c. Dr. Eliseo Kintanar
d. Dr. Alfredo Santos
25) Two items of similar shapes and weights are drop simultaneously in a building. Which of the following statement is correct about the falling objects?
a. The shape of the object has a minor effect on the falling rate.
b. The weight of the object has no effect on the falling rate.
c. The distance of the fall has an effect on the falling rate.
d. The resistance of the air has no effect on the falling rate.
26) Thyroid can be destroyed through:
a. radioactive zinc
b. radioactive manganese
c. radioactive carbon
d. radioactive iodine
27) A soda-acid type of fire extinguisher is recommended for putting out fires which involves burning ________.
a. insulation on wires
b. vegetable oil
c. dry chemicals
d. panted woodwork
28) An atom or a group of atoms which has an excess/deficiency of electrons are called ________. a. neutron
b. proton
c. ion
d. molecules
29) Fossils are most likely to be found in?
a. Metamorphic rocks
b. Igneous rocks
c. Sedimentary rocks
d. Ocean floor
30) If a doctor describes a patient as dehydrated, he means that the patient ________.
a. has a contagious disease
b. needs insulin
c. needs oxygen
d. has lost a great deal of water
31) Radium was discovered by:
a. Albert Einstein
b. Pierre and Marie Currie
c. Joseph John Thompson
d. Albert Van Haller
32) Astronauts strap themselves to a wall or bunk when they sleep. This is because during a change of shuttle velocity an unstrapped sleeping astronaut would likely slump into the shuttle wall and be injured. These astronauts have to be strapped down because?
a. They are unable to sleep while floating free in space.
b. Gravity is weak to have them remain in bed.
c. Their body functions have to be constantly monitored.
d. Their bodies have inertia.
33) Acid become colorless when added with –
a. Litmus Indicator
b. Methyl Orange Indicator
c. Universal Indicator
d. Phenolphthalein Indicator
34) The history of the earth has been divided by scientists into eras. Which of the following shows that arrangement of these areas into the paper sequence from the oldest to the most recent?
a. Precambrian, Mesozoic, Cenozoic, Paleozoic.
b. Paleozoic, Cenozoic, Precambrian, Mesozoic.
c. Cenozoic, Mesozoic, Paleozoic, Precambrian.
d. Precambrian, Paleozoic, Mesozoic, Cenozoic.
35) Which of the following is closest to normal body temperature?
a. 32 degrees Fahrenheit
b. 50 degrees Celsius
c. 212 degrees Fahrenheit
d. 37 degrees Celsius
36) Sulfuric acid is not used in
a. Making Fertilizers
b. Detergents
c. All of the above
d. None of the above
37) Which of the following statement(s) is/are TRUE?
I. Water in a cup and water in a pot at 100 degree Celsius have molecules of the same degree of activity.
II. It takes more burning of fuel to produce a pot full of boiling water than to produce a cup full of water.
III. The unit used in measuring the quantity of heat is the calorie.
IV. A pot full of water has a greater number of active molecules than those of a cup full of water.
a. II and IV only
b. All of these statements
c. None of these statements
d. I and III only
38) Which of the following causes the seasons?
a. The rotation of the Earth around the Sun.
b. The rotation of the Sun around the Earth.
c. The distance of the Earth around the Sun.
d. The tilting of the Earth on its axis.
39) Which of the following statements best explain why copper is the metal most widely used in electrical wiring?
a. It is the best conductor of electricity.
b. It is cheaper than aluminum.
c. It is better conductor than aluminum and cheaper than silver.
d. It has high resistance to electricity.
40) To achieve ecological balance, which of the following sets of components should an aquarium contain.
a. Water, fish
b. Water, snail, fish
c. Water, plants, fish
d. Water, plants, snail, fish
NATURAL SCIENCE (1) ANSWERS:
1. C
2. D
3. B
4. B
5. B
6. C
7. D
8. A
9. D
10. D
11. C
12. C
13. D
14. B
15. B
16. D
17. D
18. D
19. B
20. B
21. C
22. C
23. C
24. D
25. C
26. D
27. A
28. C
29. C
30. D
31. B
32. B
33. D
34. D
35. D
36. D
37. B
38. D
39. C
40. D
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