LET Practice in Physical Science

1. LET Practice Test in Physical Science
MULTIPLE CHOICE.
1. Most cars have ‘’four-stroke internal combustion engines.” Which of the following gives the
correct sequence of the four strokes?
A. Power-compression-intake-exhaust
B. Compression-exhaust-power-intake
C. Intake-power-compression-exhaust
D. Intake-compression-power-exhaust
2. The image in a plane mirror is _______________.
A. Inverted, virtual with a magnification of 1
B. upright, real with a magnification of 2
C. inverted, real with a magnification of ½
D. upright, virtual with a magnification of 1
3. Which of the following wave characteristics remains unchanged when a wave crosses a
boundary into a different medium?
A. Velocity C. Frequency
B. Amplitude D. Wavelength
4. Which of the following electromagnetic radiations has the lowest frequencies?
A. Gamma rays C. Ultraviolet rays
B. Radio waves D. X-rays
5. If something gets a positive electric charge, then follows that something else__________.
A. become magnetized
B. becomes equally negatively charged
C. becomes equally positively charged
D. becomes negatively charged, but not necessarily equally negatively charged
6. Hydrocarbons which do NOT have maximum number of hydrogen atoms are _______.
A. aromatic C. saturated
B. isometric D. unsaturated

2. 7. Metals have been used for making coins and jewelry. Which of the following characteristics is
true of metals?
A. Metals are malleable and ductile
B. Metals have high tensile strength
C. Metals are good conductors of heat and electricity
D. all of the above
8. Which of the following is that single force applied at the same point that will produce the
same effect?
A. reactant force C. resultant force
B. composite force D. concurrent force
9. How many grams of chloral are needed to produce 10.5 g of DDT?
A. 10.5 g C. 4.36 g
B. 8.72 g D. 13.1 g
10. The half-life Carbon- 14 is 6739 years. Suppose a container was found to contain one half as
much Carbon- 14 as a new basket of the same material. What is the approximate age of the
bowl?
A. 3716 years C. 2856 years
B. 1432 years D. 6739 years
11. What kind of energy is present whenever a body is at a distance from the ground?
A. elastic potential energy
B. electric potential energy
C. electromagnetic potential energy
D. gravitational potential energy
12. A lunar eclipse occurs when the ____________.
A. moon is between the sun and the earth
B. moon, earth and sun form a right angle
C. earth is between the moon and sun
D. sun is in between moon and earth
13. 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 days
14. Which of these minerals is present in seawater with the highest percentage?
A. Sodium chloride C. Magnesium chloride
B. Magnesium sulfate D. Calcium sulfate
15. What must be the minimum length of a plane mirror in order for you to see a full view o f
yourself?
A. Your full height C. One-half
B. One-forth D. Three-fourths
16. At what particular instance will the period and frequency of a wave changed?
A. When it travels from one medium to another
B. When it is at its equilibrium position
C. When it interferes with another wave
D. When it reflects
17. What laws states that there is decrease in pressure at the side of a moving stream of fluid?
A. Bernoulli’s Law C. Archimedes’ Law
B. Pascal’s Law D. Hooke’s Law

3. 18. Whose discovery involved the production of magnetism by means of electricity?
A. Ohm B. Lenz C. Faraday D. Oersted
19. In the absence of air friction, what happens when a balls allowed to roll down one hill and up
a 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 for
0.5 hr. What is the average speed for the 2-hour travel?
A. 80 km/hr C. 100 km/hr
B. 90 km/hr D. 85 km/hr
21. In Moh’s scale, which is the softest and the hardest mineral?
A. Talc – Diamond C. Calcite – Feldspar
B. Gypsum – Quartz D. Talc – Corundum
22. 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 objects
B. kinetic energy of each object D. momentum of each object
24. 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 is
A. heat C. electric
B. chemical D. mechanical
26. Disregarding air resistance, an object falling towards the earth’s surface has an acceleration
that is _____________.
A. decreasing C. constant
B. increasing D. depending on object’s weight
27. 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 III
B. I, II and IV D. I, II, III and IV

4. 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 W
B. 240 W D. 3600 W
29. Abundance of waste materials in water decreases primary productivity due to ___________.
A. blockage of light penetration
B. amount of nutrients available
C. reduced amount of oxygen in the water
D. accumulation of aquatic organisms
30. What is the direction of the magnetic field in an electromagnetic wave?
A. parallel to the electric field C. parallel to the motion
B. perpendicular to the electric field D. random
31. A ball of mass 0.15 is thrown with a speed of 20 m/s against a wall. What is its momentum if
it 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/s
32. How are echoes minimized in halls and auditoriums?
A. covering hard reflecting surfaces with curtains
B. opening the doors of the auditoriums
C. creating a wider space for sound to travel
D. limiting the accessories installed inside
33. A large depression caused by a collapse of the slopes of a volcano is called a _________.
A. basin C. base level
B. syncline D. caldera
34. Where does the pick up needle on a phonograph move the fastest across the record?
A. At the end
B. The needle move at the same speed throughout
C. In the middle of the phonograph record
D. At the beginning
35. Compared to the density of seawater, a kind of fish that lives at the bottom of the ocean has a
density that is __________.
A. lesser C. same
B. greater D. equal
36. 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 becomes
colorless.
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.

5. 38. A ray of light is incident on a plane surface separating two transparent substances of
refractive indices 1.70 and 1.50. The angle of incidence is 30 deg and the ray originates in the
medium of higher index. The angle of refraction is _________.
A. 79.0 C. 45.0
B. 34.5 D. 26.2
39. Chrome plating is one method to prevent corrosion. This process can be carried out
by_______.
A. using secondary cells C. using primary cells
B. electrolytic process D. zone refining
40. What does the slope of the graph of stretching force against elongation indicate?
A. elastic limit C. gravitational limit
B. resistivity constant D. spring constant
GOOD LUCK! –Prof. Cris Paner
Answer Key:
1. D 11. D 21. A 31. C
2. D 12. C 22.B 32. A
3. C 13. B 23. A 33. D
4. B 14. A 24. C 34. B
5. D 15. C 25. D 35. D
6. D 16. C 26. C 36. A
7. D 17. A 27. C 37. D
8. D 18. C 28. A 38. A
9. D 19. A 29. C 39. B
10. D 20. D 30. B 40. D
BACKGROUND OF MR. CRISENCIO M. PANER:
Ph.D. in Biological Science (Candidate), UST
M.S. in Microbiology, UST
B.S. Biochemistry, UST
Italian Government Scholar
College Scholar
Certificate in Education
10th
Placer Licensure Exams for Teachers
20 years of experience as a teacher (College, High School,
Elementary)

6. Expert in Internet, Computer (Software, Hardware, and
Repair)
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