Light - One Mark Questions

8th Standard EM

    Reg.No. :
  •  
  •  
  •  
  •  
  •  
  •  

Science

Time : 00:30:00 Hrs
Total Marks : 20
    10 x 1 = 10
  1. Mirrors having a curved reflecting surface are called as

    (a)

    plane mirrors

    (b)

    spherical mirrors

    (c)

    simple mirrors

    (d)

    None of the above

  2. The distance from the pole to the focus is called

    (a)

    Pole length

    (b)

    focal length

    (c)

    principal axis

    (d)

    None of the above

  3. Focal length is equal to half of the

    (a)

    centre of curvature

    (b)

    axis

    (c)

    radius of curvature

    (d)

    None of the above

  4. If the focal length of a spherical mirror is 10 cm, what is the value of its radius of curvature?

    (a)

    10 cm

    (b)

    5 cm

    (c)

    20 cm

    (d)

    15 cm

  5. The refractive index of water is

    (a)

    1.0

    (b)

    1.33

    (c)

    1.44

    (d)

    1.52

  6. __________ form the perfect image of an object

    (a)

    Spherical mirrors

    (b)

    Parabolic mirrors

    (c)

    Plane mirrors

    (d)

    Cylindrical mirrors

  7. Mirrors which magnify the object placed close to them.

    (a)

    Convex mirror

    (b)

    Concave mirror

    (c)

    Plane mirror

    (d)

    ellipsoid mirror

  8. In which mirror the following statement is labeled?

    (a)

    Convex mirror

    (b)

    Concave mirror

    (c)

    Plane mirror

    (d)

    Spherical mirror

  9. An imaginary line perpendicular to the reflecting surface is called

    (a)

    imaginary line

    (b)

    curved line

    (c)

    Perpendicular line

    (d)

    normal

  10. When the angle of inclination decreases the number of images formed _________

    (a)

    increase

    (b)

    decreases

    (c)

    remain same

    (d)

    none of the above

  11. 5 x 1 = 5
  12. The spherical mirror used in a beauty parlour as make-up mirror is ___________.

    ()

    Concave mirror

  13. Geometric centre of the spherical mirror is ________.

    ()

    Pole

  14. Nature of the images formed by a convex mirror is _________.

    ()

    Virtual and erect

  15. _________ is a device which produces numerous pattern of images

    ()

    Kaleidoscope

  16. __________ is the best reflector of light

    ()

    Silver

  17. 5 x 1 = 5
  18. Convex mirror

  19. (1)

    Bouncing of light

  20. Parobolic mirror

  21. (2)

    Bending of light

  22. Regular reflection

  23. (3)

    Radio telescopes

  24. Reflection

  25. (4)

    plane mirror

  26. Refraction

  27. (5)

    rear - view mirror

*****************************************

Reviews & Comments about 8th Standard Science - Light One Mark Question with Answer Key

Write your Comment