Light energy Quiz - ICSE Class 7 Science
Free practice quiz: Light energy (ICSE Class 7 Science). 46 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
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When light travels from one medium to another, say from air to water, its path bends. This phenomenon is known as:
- Reflection
- Refraction
- Diffraction
- Dispersion
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Answer: B. Refraction
Refraction is the bending of light as it passes from one medium to another, due to the change in its speed.
The phenomenon where light bounces back from a surface is called:
- Refraction
- Diffraction
- Reflection
- Absorption
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Answer: C. Reflection
Reflection is the bouncing back of light when it strikes a surface.
A virtual image is:
- Always inverted
- Can be projected onto a screen
- Formed by the actual convergence of light rays
- Cannot be projected onto a screen
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Answer: D. Cannot be projected onto a screen
A virtual image is formed where light rays appear to diverge from, not where they actually meet. Therefore, it cannot be projected onto a screen. It is always erect.
When light travels from a denser medium to a rarer medium, it bends:
- Towards the normal
- Away from the normal
- Parallel to the normal
- Does not bend
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Answer: B. Away from the normal
When light passes from a denser medium to a rarer medium, its speed increases, causing it to bend away from the normal.
When light enters a rarer medium from a denser medium, the angle of refraction is:
- Equal to the angle of incidence
- Less than the angle of incidence
- Greater than the angle of incidence
- Zero
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Answer: C. Greater than the angle of incidence
When light moves from a denser to a rarer medium, its speed increases, and it bends away from the normal. This means the angle of refraction is greater than the angle of incidence.