Refraction Quiz - CBSE Class 9 Science

Free practice quiz: Refraction (CBSE Class 9 Science). 20 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. What is refraction?

   1. The bending of light when it passes through a medium
   2. The bouncing of light off a surface
   3. The scattering of light by small particles
   4. The absorption of light by a medium
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   Answer: A. The bending of light when it passes through a medium

   Refraction is defined as the bending of light as it passes from one medium to another with a different refractive index.

2. Which of the following materials has the highest refractive index?

   1. Diamond
   2. Water
   3. Air
   4. Glass
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   Answer: A. Diamond

   Diamond has the highest refractive index among the options given, causing light to slow down significantly and bend.

3. What is total internal reflection?

   1. The phenomenon when light reflects completely within a medium
   2. The bending of light away from normal at low angles
   3. Reflection that occurs on a rough surface
   4. Inclination of light rays after refraction
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   Answer: A. The phenomenon when light reflects completely within a medium

   Total internal reflection is when the light is completely reflected at the boundary of two media due to a large angle of incidence beyond the critical angle.

4. What happens in an optical fiber due to refraction?

   1. Multiple total internal reflections
   2. Light is absorbed completely
   3. Immediate refraction out of fiber
   4. Constant refraction along fiber
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   Answer: A. Multiple total internal reflections

   Optical fibers use refraction to guide light through the core, undergoing successive total internal reflections due to the high refractive index difference with cladding.

5. What is the importance of refractive index in optical coherence tomography (OCT)?

   1. Determines resolution by light scattering
   2. Is crucial for gathering magnetic fields
   3. Has no relevance to OCT
   4. Dictates the path of electrical signals
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   Answer: A. Determines resolution by light scattering

   In OCT, refractive index variance affects light scattering properties, thereby influencing image resolution and depth accuracy during non-invasive diagnostic imaging.

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