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LET Practice Test in Physical ScienceMULTIPLE CHOICE.1. Most cars have ‘’four-stroke internal combustion engines.” Which of the following gives thecorrect sequence of the four strokes?A. Power-compression-intake-exhaustB. Compression-exhaust-power-intakeC. Intake-power-compression-exhaustD. Intake-compression-power-exhaust2. The image in a plane mirror is _______________.A. Inverted, virtual with a magnification of 1B. upright, real with a magnification of 2C. inverted, real with a magnification of ½D. upright, virtual with a magnification of 13. Which of the following wave characteristics remains unchanged when a wave crosses aboundary into a different medium?A. Velocity C. FrequencyB. Amplitude D. Wavelength4. Which of the following electromagnetic radiations has the lowest frequencies?A. Gamma rays C. Ultraviolet raysB. Radio waves D. X-rays5. If something gets a positive electric charge, then follows that something else__________.A. become magnetizedB. becomes equally negatively chargedC. becomes equally positively chargedD. becomes negatively charged, but not necessarily equally negatively charged6. Hydrocarbons which do NOT have maximum number of hydrogen atoms are _______.A. aromatic C. saturatedB. isometric D. unsaturated
7. Metals have been used for making coins and jewelry. Which of the following characteristics istrue of metals?A. Metals are malleable and ductileB. Metals have high tensile strengthC. Metals are good conductors of heat and electricityD. all of the above8. Which of the following is that single force applied at the same point that will produce thesame effect?A. reactant force C. resultant forceB. composite force D. concurrent force9. How many grams of chloral are needed to produce 10.5 g of DDT?A. 10.5 g C. 4.36 gB. 8.72 g D. 13.1 g10. The half-life Carbon- 14 is 6739 years. Suppose a container was found to contain one half asmuch Carbon- 14 as a new basket of the same material. What is the approximate age of thebowl?A. 3716 years C. 2856 yearsB. 1432 years D. 6739 years11. What kind of energy is present whenever a body is at a distance from the ground?A. elastic potential energyB. electric potential energyC. electromagnetic potential energyD. gravitational potential energy12. A lunar eclipse occurs when the ____________.A. moon is between the sun and the earthB. moon, earth and sun form a right angleC. earth is between the moon and sunD. sun is in between moon and earth13. How long does it takes the moon to go through all of its phases?A. 1 year B. 29 ½ days C. 24 hours D. 27 1/3 days14. Which of these minerals is present in seawater with the highest percentage?A. Sodium chloride C. Magnesium chlorideB. Magnesium sulfate D. Calcium sulfate15. What must be the minimum length of a plane mirror in order for you to see a full view o fyourself?A. Your full height C. One-halfB. One-forth D. Three-fourths16. At what particular instance will the period and frequency of a wave changed?A. When it travels from one medium to anotherB. When it is at its equilibrium positionC. When it interferes with another waveD. When it reflects17. What laws states that there is decrease in pressure at the side of a moving stream of fluid?A. Bernoulli’s Law C. Archimedes’ LawB. Pascal’s Law D. Hooke’s Law
18. Whose discovery involved the production of magnetism by means of electricity?A. Ohm B. Lenz C. Faraday D. Oersted19. In the absence of air friction, what happens when a balls allowed to roll down one hill and upa second hill?A. The ball would lose speed more slowly as it moves up the second hill.B. The ball would travel a longer distance uphill.C. The ball would travel a shorter distance as it moves up.D. The ball would practically reach the same horizontal level from where it started.20. A car travels at 80 km/hr for 0.5 hr, then goes 100 km/hr for 1 hour, and finally 60 km/hr for0.5 hr. What is the average speed for the 2-hour travel?A. 80 km/hr C. 100 km/hrB. 90 km/hr D. 85 km/hr21. In Moh’s scale, which is the softest and the hardest mineral?A. Talc – Diamond C. Calcite – FeldsparB. Gypsum – Quartz D. Talc – Corundum22. According to the kinetic molecular theory, liquids are similar to solids in that ___________A. their molecules are arranged in a regular manner.B. the motion of their particles changes with temperature.C. the motion of their particles cannot be determined.D. there is very little space between their molecules.23. When two or more objects collide the quantity that does NOT change is the total__________.A. Momentum of all the objects C. kinetic energy of all the objectsB. kinetic energy of each object D. momentum of each object24. What is the correct formula for finding the efficiency of a machine?A. Efficiency = input force /output force x 100%B. Efficiency = output force/input force x 100%C. Efficiency = output work/input work x 100%D. Efficiency = input work/ output work x 100%25. The energy of a hammer hitting a nail isA. heat C. electricB. chemical D. mechanical26. Disregarding air resistance, an object falling towards the earth’s surface has an accelerationthat is _____________.A. decreasing C. constantB. increasing D. depending on object’s weight27. If the moon’s gravity becomes 1/4 that of Earth, which of the following will apply?I. The moon will no longer cause tides on the earth’s oceans.II. A 65–kilo person on earth will weigh about 18 kilos on the moon.III. It will be easy to lift heavy objects on the moon.IV. The moon will not hold a thick atmosphere of gasses.A. II, III and IV C. I, II and IIIB. I, II and IV D. I, II, III and IV
28. The headings of a car with a 12V electrical system are 40W each the tail lights 6.0 W each,and the radios is 20 W. What is the total power of this circuit?A. 1200 W C. 110 WB. 240 W D. 3600 W29. Abundance of waste materials in water decreases primary productivity due to ___________.A. blockage of light penetrationB. amount of nutrients availableC. reduced amount of oxygen in the waterD. accumulation of aquatic organisms30. What is the direction of the magnetic field in an electromagnetic wave?A. parallel to the electric field C. parallel to the motionB. perpendicular to the electric field D. random31. A ball of mass 0.15 is thrown with a speed of 20 m/s against a wall. What is its momentum ifit rebounds after colliding elastically?A. +3.0 kg m/s B. -30 kg m/s C. -3.0 kg m/s D. +30 kg m/s32. How are echoes minimized in halls and auditoriums?A. covering hard reflecting surfaces with curtainsB. opening the doors of the auditoriumsC. creating a wider space for sound to travelD. limiting the accessories installed inside33. A large depression caused by a collapse of the slopes of a volcano is called a _________.A. basin C. base levelB. syncline D. caldera34. Where does the pick up needle on a phonograph move the fastest across the record?A. At the endB. The needle move at the same speed throughoutC. In the middle of the phonograph recordD. At the beginning35. Compared to the density of seawater, a kind of fish that lives at the bottom of the ocean has adensity that is __________.A. lesser C. sameB. greater D. equal36. The additional of Br2 is used as the reaction to distinguish between alkenes and alkanes.Which of the following observations accompanies this test?A. When Br2 is added to the double bond of alkenes to make a dibromide, it becomescolorless.B. A bright red color is produced when Br2 reacts with alkenes.C. The red color of bromine disappears when it dissolves in alkenes.D. Bromine dissolved in alkenes but not in alkenes.37. Which statement is CORRECT about a rechargeable battery?A. Its REDOX reactions are not complete.B. Its REDOX reactions are not reversible.C. Its REDOX reactions are complete.D. Its REDOX reactions are reversible.
38. A ray of light is incident on a plane surface separating two transparent substances ofrefractive indices 1.70 and 1.50. The angle of incidence is 30 deg and the ray originates in themedium of higher index. The angle of refraction is _________.A. 79.0 C. 45.0B. 34.5 D. 26.239. Chrome plating is one method to prevent corrosion. This process can be carried outby_______.A. using secondary cells C. using primary cellsB. electrolytic process D. zone refining40. What does the slope of the graph of stretching force against elongation indicate?A. elastic limit C. gravitational limitB. resistivity constant D. spring constantGOOD LUCK! –Prof. Cris PanerAnswer Key:1. D 11. D 21. A 31. C2. D 12. C 22.B 32. A3. C 13. B 23. A 33. D4. B 14. A 24. C 34. B5. D 15. C 25. D 35. D6. D 16. C 26. C 36. A7. D 17. A 27. C 37. D8. D 18. C 28. A 38. A9. D 19. A 29. C 39. B10. D 20. D 30. B 40. DBACKGROUND OF MR. CRISENCIO M. PANER:Ph.D. in Biological Science (Candidate), USTM.S. in Microbiology, USTB.S. Biochemistry, USTItalian Government ScholarCollege ScholarCertificate in Education10thPlacer Licensure Exams for Teachers20 years of experience as a teacher (College, High School,Elementary)
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