Reviewing before examinations is important because students able to recall previous lessons.

1. GRADE 8 REVIEW FOR 2ND
QUARTER EXAMINATION

2. A fracture that shows as a line
along which the crust has
moved.
Fault line

3. It is a sudden and violent
shaking off the ground.
Earthquake

4. It refers to the outermost layer
of the Earth.
Crust

5. It is the point where the rocks
starts to fracture.
Focus

6. It is a break in the Earth’s crust
along which significant
movement has taken place.
Fault

7. It is the point on land directly
above the focus.
Epicenter

8. It measures the energy released
at the source of the earthquake.
Magnitude

9. What specific instrument does
the PHIVOLCS being used in
monitoring the movement of the
Earth’s crust?
Seismograph

10. It causes earthquakes and has
been moved in the past and are
expected to move again in the
future.
Active fault

11. PHIVOLCS means ___________.
Philippine Institute of
Volcanology and Seismology

12. It causes a sudden push from an
underwater fault and can
produce waves.
Tsunami

13. It measures the strength of
shaking produced by the
earthquake at a certain location.
Intensity

14. It is a system of thunderstorms
that move around a center.
Tropical cyclone

15. It is the term being used in the
Northeastern part of the Pacific
Ocean and in the Northern part
of the Atlantic Ocean.
Hurricane

16. These are characterized by
winds and rain clouds that go
around a center.
Typhoon

17. There are about ____ tropical
cyclones enter the Philippine
Area of Responsibility each year.
20

18. Tropical depression, tropical
storm, typhoon, and
supertyphoon are started out in
the ________________________.
Pacific Ocean

19. In the Philippines, we commonly
experience _________ and __________
during typhoons.
excessive rain and strong
winds

20. Satellite communications,
radars, TV transmission and
microwave oven are best
applications of _____________.
Microwaves

21. What kind of mirror is used in
automobiles and trucks to give
the driver a wider area and
smaller image of traffic behind
him.
Convex mirror

22. What type of mirror do dentists
usually use to see clearly the
images of our teeth.
Concave mirror

23. It is the bouncing off of light rays
when it hits a surface like a
plane mirror.
Radiation

24. A kind of mirror in which the
reflecting surface is curved or
bend inward.
Concave mirror

25. A kind of mirror in which the
reflecting surface is curved or
bend outward.
Convex mirror

26. A ray of light approaching the
mirror represented by an arrow
approaching an optical element
like mirrors.
Incident ray

27. A ray of light which leaves the
mirror and is represented by an
arrow pointing away from the
mirror.
Reflected ray

28. If you placed a number chart in
front of a plane mirror, what
numbers will you read properly
in the mirror?
0 and 8

29. This is a reflection of light on
smooth surfaces such as mirrors
or a calm body of water.
Specular / Regular Reflection

30. This is a reflection of light on
rough surfaces such as clothing,
paper, wavy water, and the
asphalt roadway.
Diffused / Irregular
Reflection

31. It helps to determine the
approximate location and size of
the image.
Ray diagram

32. What kind of mirror is used by
department stores to give a
wider area and smaller image of
the shoppers/buyers.
Convex mirror

33. Sun’s rays are observed to focus
at a point behind the fishbowl
near the window. The fishbowl
act as what type of lens?
Converging lens

34. A white sheet of paper cannot
act as mirror because it ________
the rays of light.
diffuses

35. This optical instrument uses two
convex lenses to make a smaller
object larger.
Microscope

36. Which of the following optical
instruments will be used to
produce a reduced and inverted
image of a distant object?
Camera

37. It is a reflecting surface in which
its surface is a section of sphere.
Curved mirror

38. Diagnosis of bone fractures
X-ray

39. Sterilization of medical
instruments
Gamma rays

40. Camera autofocusing
Infrared

41. Sterilization of water in drinking
fountains
Ultraviolet rays

42. Radio broadcasting
Radio broadcasting

43. 2 Types of Lenses
Concave lens
Convex lens

44. 2 Types of Reflection
Specular/Regular Reflection
Diffuse/Irregular Reflection

45. 2 Laws of Reflection
1. The angle of incidence is
always equal to the angle of
reflection.
2. The incident ray, the
reflected ray, and the
normal all lie in the same
plane.

46. 4 Principal Rays in Curved
Mirrors
1. P – F ray
2. F – P ray
3. C – C ray
4. V ray

47. Optical Instruments
Magnifying glass, Binoculars,
Telescope, Microscope,
Periscope, Camera,

48. (For Test IV – Illustration)
Draw the 4 Principal Rays in
Concave Mirrors