Physic : Lenses/Mirrors MCQ Set-3

MCQ Set-3

1. What is the minimum distance between the convex lens and the object to produce a real image ?
a.  0                          b.  f
c.  2f                         d. 4f

2. What kind of lens is used by short-sighted persons?
a. convex
b. concave
c. cylindrical
d. compound

3.  A _____ mirror is like the side mirrors on a car. “Objects are closer than they appear”.
a. Convex
b. Concave
c. Parabolic
d. Plane

4. An object is kept 5 cm in front of a concave mirror of focal length of 15 cm. What will be the nature of the image?
a. virtual, not magnified
b. virtual, magnified
c. real, magnified
d. real not magnified

5. A decrease in aperture of a lens changes the
a.  Size of the image
b.  Position of the image
c.  both position and size
d.  intensity of the image

6. In projectors which lenses are used?
a.  Convex lens
b.  Concave lens
c.  Bipolar lens
d.  Both (a) and (b)

7. The head mirror used by E.N.T doctors is –
a. Concave
b. Convex
c. Plane
d. Plano-convex

8. how will the image formed by a convex lens be affected if the central portion of the lens is blackened ?
a. No image will be formed by the lens
b. The central portion of the image will be absent
c. The full image will be formed but it will be less bright
d. There will be two images, one due to each exposed portions

9. What type of mirror is used in a view finding mirror of a vehicle?
a. Convex mirror
b. Concave mirror
c. Plane mirror
d. Paraboloidal mirror

10.  An image formed with a lens , that can be projected onto a screen , is called a _____ image.
a. Virtual
b. Real
c. Imaginary
d. Objective

11. A number of images of a candle flame can be seen in a thick mirror. The brightest image is –
a. last
b. fourth
c. third
d. second

12. Due to which phenomena the stick if immersed in water appears to be bent?
a.  Reflection
b.  Dispersion
c.  Refraction
d.  Scattering

13. An object is placed at infinity. The image formed by a concave lens is always
a.  At focus
b.  Between F and 2F
c.  Beyond 2F
d.  Between focus and optical centre

14. What would be the number of images formed of an object in two mirrors placed at right angles to each other?
a. two
b. three
c. four
d. six

15.When rays of light fall on a convex lens it
a.  converges them
b.  does not bend them
c.  diverges them
d.  None of these

ANSWER

1-B | 2-B | 3-A | 4-B | 5-D | 6-A | 7-A | 8-C |
-----------------------------------------------
9-A | 10-B| 11-D| 12-C| 13-D| 14-B| 15-A|

Leave a comment