Physics Practice: Light (Mock Test 3 - Advanced)
1. Why does a sharp shadow of an object form only when the source of light is small (point source)?
2. In a solar eclipse, the region where only a partial eclipse is visible corresponds to the ________ of the Moon's shadow.
3. How does the size of the image in a pinhole camera change if the length of the camera box is increased?
4. Why is a lunar eclipse visible from a much larger area of Earth compared to a solar eclipse?
5. Which of the following best explains why we cannot see through a piece of cardboard?
6. If a pinhole camera is used to view a tall tree, the top of the tree appears at the bottom of the screen. This proves:
7. A point source of light is placed in front of an opaque object. The shadow formed on a screen will have:
8. When the Moon completely enters the umbra region of the Earth's shadow, it is a:
9. "Scattering" of light by dust particles in a dark room allows us to see the path of light. This is similar to:
10. Why do we see lightning before we hear the thunder?
11. A convergent beam of light is one where the rays of light:
12. If the Earth had no atmosphere, the sky during the day would appear:
13. Which of the following is a "cold source" of light (produces light without much heat)?
14. What happens to the brightness of the image in a pinhole camera if the pinhole size is decreased?
15. A shadow formed by an extended source of light has two regions. The region of partial darkness is:
16. We cannot see a shadow of an aeroplane flying very high in the sky because:
17. Light is an electromagnetic wave. This means it can travel through:
18. The image in a pinhole camera is a "real image" because:
19. During a total solar eclipse, the Sun's outer atmosphere, visible as a glowing ring, is called the:
20. Which of the following correctly describes the nature of light rays from the Sun when they reach Earth?