Saturday, October 8, 2011

Class 10 - Light MCQ - Quiz

Light (Quiz)
MCQs
1. The line perpendicular to the reflective surface is the __________.
    a. normal
    b. line of refraction
    c. line of incidence
    d. line of reflection

2. Your image in a bathroom mirror results from __________.
   a.  diffuse reflection
   b. specular refraction
   c. specular reflection
   d. diffuse refraction

3. How does light normally travel?
    a.  in concentric circles
    b.  in a straight line
    c. always toward a dark area
    d. in a curved line



4. What is f if you have an object 2.0 m from the concave mirror, and the image is 4.0 m from the mirror?
    a. 2.0m
    b. 0,67 m
    c. 1.3 m
    d. 4.0 m

5. In a concave mirror, an object placed __________ will result in a virtual image.
    a.  twice the distance of the focal point
    b. between the focal point and mirror
    c. between the focal point and twice the distance of the focal point
    d.  past the focal point

6. Which type of mirror produces an image that is always erect, always the same height as the object, and always virtual?
     a. convex
     b. concave
     c. plane
     d. none of these

7. __________ is located behind a convex mirror.
   a. The focal point
   b. A ray
   c. A real image
   d. The object

8. The image from a convex mirror will _________.
    a. always be real
    b. always be projected
    c. always be virtual
    d. never be virtual

9. Light travels fastest through which of the following materials?
    a. diamond
    b. water
    c. glass
    d. air


Answers: 
  1-a: The line perpendicular to the reflective surface is the normal.   
  2-c: Light that reflects off a flat reflective surface is called specular reflection.
  3-b: Light will travel in a straight line until it reaches a boundary, at which time it can refract or reflect.
  4-c: apply mirror equation to find f.
  5-b: check NCERT book. In a concave mirror, an object placed between the focal point and the mirror will result in a virtual image.
  6-c: Plane mirrors produce images that are always erect, always the same height as the object, and always virtual.
  7-a:  Because a convex mirror curves outward, its focal point is actually behind the mirror itself.       
  8-c: The image from a convex mirror will always be virtual.
  9-d:  The speed of light through matter is determined by the interaction of the light with atoms in the material. Molecules in air are more spread apart.

13 comments:

  1. this is very help ful and reading at this i got very good marks in it also

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  2. This comment has been removed by the author.

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  3. Mza aa gya chk de ftee ,,paper me fail ho gya!! :o

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  4. good questions bt we want some more question and aslo hard ones

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  5. in Q.4 all the options should be negative because in a concave mirror the fF is always negative

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  6. Why light always travel in a straight line

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  7. Why light always travel in a straight line

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