Light Energy Quiz - ICSE Class 8 Science
Free practice quiz: Light Energy (ICSE Class 8 Science). 48 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
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What property of light is responsible for the formation of shadows?
- Its wave nature
- Its particle nature
- Its rectilinear propagation
- Its polarization
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Answer: C. Its rectilinear propagation
Rectilinear propagation means that light travels in straight lines. When an opaque object is placed in the path of light, it blocks the light, creating a shadow behind it because the light cannot bend around the object.
Which of the following colors has the longest wavelength in the visible spectrum?
- Blue
- Green
- Red
- Indigo
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Answer: C. Red
In the visible spectrum, red light has the longest wavelength and the lowest frequency. Violet light has the shortest wavelength and the highest frequency.
Which phenomenon causes a rainbow to form?
- Reflection only
- Refraction and reflection
- Dispersion and reflection
- Refraction, dispersion, and internal reflection
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Answer: D. Refraction, dispersion, and internal reflection
Rainbows are formed when sunlight interacts with water droplets in the atmosphere. Sunlight is refracted as it enters a droplet, dispersed into its constituent colors, reflected internally off the back of the droplet, and then refracted again as it exits.
A convex mirror is also known as a:
- Converging mirror
- Diverging mirror
- Focusing mirror
- Magnifying mirror
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Answer: B. Diverging mirror
A convex mirror diverges parallel rays of light away from its surface. Therefore, it is also called a diverging mirror.
A lens that is thicker in the middle and thinner at the edges is a:
- Concave lens
- Convex lens
- Plane mirror
- Prism
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Answer: B. Convex lens
A convex lens is defined by its shape: thicker at the center and tapering towards the edges. This shape allows it to converge parallel light rays to a focal point.