Directions: Read each item carefully. Write only the letter of your answer for each question. Use a separate sheet for your answers.
1. How do you call objects that emit light?
A. luminous
B. non-luminous
C. opaque
D. transparent
2. Which of the following items best describes the nature of light?
A. current and wave
B. mass and particle
C. point and wave
D. wave and particle
3. The following are natural sources of light in the surroundings, EXCEPT__________ A. fire
B. flashlight
C. jellyfish
D. lightning
4. Which of the following are the correct reasons why we see a clear image of our face when we look on the mirror?
I. A mirror has plane and smooth surface.
II. Incident light rays to a mirror get diffracted when it strikes a mirror. III. Incident light rays to the mirror get refracted on the surface of mirror. IV. Incident light rays to a mirror get reflected when it strikes on plane surface.



A. I and II only
B. I and III only
C. I and IV only
D. III and IV only
5. According to Louis de Broglie, why is light said to have a dual nature? A. It shows the properties of wave only.
B. It exhibits the properties of reflection.
C. It has both interference and polarization effect.
D. It displays the properties of both wave and particle.
6. Who among the scientists below formulated the wave theory of light? A. Isaac Newton
B. Louis de Broglie
C. Christian Huygens
D. James Clerk Maxwell
2 CO_Q3_Science 7_ Module 5
7. Which of the following is NOT a property of light?
A. Direction
B. Frequency
C. Intensity
D. Width
8. Which of the following materials would reflect light the most?
A. black rock
B. dark brown carpet
C. flat sheet of aluminum foil
D. piece of red construction paper
9. The distance of an observer from two identical kinds of light sources varies. Light source A is 200 centimeters away while the light source B is 300 centimeters away from the observer. Does light source A give higher light intensity than light source B?
A. Yes, because it is away from the observer
B. Yes, because it is much closer to the observer
C. No, because the distances of light source vary
D. No, because its distance is closer from the observer
10. The intensity of light is inversely proportional to the distance from the eye of the observer. Which of the following statements explain the relationship between intensity and distance?
I. As the distance increases, the intensity of light decreases because it spreads out over a larger surface area.
II. When the distance increases, the intensity of light increases because the light rays compressed in larger surface area.
III. If the distance increases, the intensity of light decreases because light waves spread out more in its surrounding.



A. I, II, and III
B. I and II only
C. I and III only
D. II and III only
For items 11 to 13, refer to the illustration below. Suppose two identical kinds of light sources, A and B, shines on a surface of a board when placed 100 cm to the left and 50 cm to the right of the board, respectively.
A B
100 cm 50 cm
3 CO_Q3_Science 7_ Module 5
11. Will the light intensity measured on the cardboard facing light source A is higher than the side facing light source B?
A. No, because light source A is farther from the cardboard than light source B. B. Yes, because light source A is farther from the cardboard than light source B. C. Yes, because light source B is much closer to the cardboard than light source A.
D. No, because the distance of light sources has no effect on their light intensities.
12. How does the amount of light intensity of light source B compare to light source A as measured on the surface of the cardboard?
A. They have equal light intensities.
B. They have varying light intensities per time.
C. The side facing light source A has greater light intensity.
D. The side facing light source B has greater light intensity.
13. Which of the following statements correctly describes the brightness of light sources A and B?
I. Light source A is brighter than light source B.
II. Light source B is brighter than light source A.
III. Light sources A and B produce unequal brightness.
IV. No differences in brightness between light sources A and B.



A. I, and II only
B. II and III only
C. III and IV only
D. I, II, and III only
14. Which of the following terms best describes an object that emit energy in the form of light?
A. Fluorescence
B. Incandescence
C. Luminous
D. Phosphorescence
15. The following objects are luminous, EXCEPT__________________.
A. sun
B. moon
C. burning wood
D. flashlight switched on
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