Rectilinear propagation, Shadows, Pinhole Camera Quiz - ICSE Class 6 Physics

Free practice quiz: Rectilinear propagation, Shadows, Pinhole Camera (ICSE Class 6 Physics). 43 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. When light travels from one transparent medium to another, it bends. This phenomenon is known as:

   1. Reflection
   2. Refraction
   3. Diffraction
   4. Dispersion
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   Answer: B. Refraction

   Refraction is the bending of light as it passes from one medium to another. This occurs because the speed of light changes in different media.

2. In a pinhole camera, the image formed on the screen is on a flat surface. This implies that:

   1. The image is always distorted
   2. The pinhole acts as a lens
   3. The image is a projection
   4. The image is directly visible
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   Answer: C. The image is a projection

   The image formed in a pinhole camera is a projection of the object onto the screen, formed by light rays passing through the pinhole. It's not a lens-formed image, and while it's inverted, distortion isn't inherent to the projection itself, but rather how light rays from different angles converge.

3. Which of these is NOT an example of rectilinear propagation of light?

   1. Formation of an eclipse
   2. Formation of a rainbow
   3. Formation of a shadow
   4. Light beam from a searchlight
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   Answer: B. Formation of a rainbow

   Rainbows are formed due to dispersion and refraction of light through water droplets, not primarily due to light traveling in straight lines.

4. The principle of rectilinear propagation of light is demonstrated by:

   1. A magnifying glass
   2. A mirror
   3. A periscope
   4. A rainbow
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   Answer: C. A periscope

   A periscope uses mirrors to change the direction of light. The light travels in straight lines between the mirrors, and then into the observer's eye, demonstrating rectilinear propagation. A rainbow is due to dispersion and refraction.

5. The sharpness of the shadow cast by an object is primarily determined by:

   1. The colour of the object
   2. The size of the light source
   3. The transparency of the object
   4. The distance of the screen from the object
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   Answer: B. The size of the light source

   A smaller light source (closer to a point source) produces sharper shadows with well-defined edges (umbra), while a larger extended source produces shadows with fuzzy edges (penumbra).

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