LIGHT, Class X,, MCQ Part -2

 

                                                           MCQ'S


MCQ Questions for Class 10 Science Light Reflection and Refraction with Answers

Students can solve NCERT Class 10 Science Light Reflection and Refraction (part-2) Latest Exam Pattern Multiple Choice Questions with Answers to know their preparation level.


Question 1. The laws of reflection hold true for:


(a) plane mirrors only

 

(c) convex mirrors only


(b) concave mirrors only

  

(d) all reflecting surfaces

 
Answer (b) concave mirrors only
 
Question 2. An object is placed 60 cm in front of a concave mirror. The real image formed by the mirror is located 30 cm in front of the mirror. What is the object’s magnification?


(a) +2


(b) -2


(c) +0.5


(d) -0.5                                                                                                                                              

Answer (d) -0.5
 
Question3. Which of the following materials cannot be used to make a lens?

                                                                               

(a) Water

 

(b) glass

 

(c) Plastic

 

(d) Clay

                            
Answer. (d) Clay
(Clay is opaque for light. Refraction of light is not possible in clay.)
 
Question4. The image formed by a concave mirror is observed to the virtual, erect, and larger than the object. Where should be the position of the object?


(a) Between the principal focus and the centre of curvature.


(b) At the centre of curvature.


(c) Beyond the centre of curvature.


(d) Between the pole of the mirror and its principal focus.


Answer (d) Between the pole of the mirror and its principal focus.
(A Concave mirror forms a virtual, erect and larger size image of an object when the object is situated between the pole of the mirror and its principal focus)

Question 5. The image of an object placed in front of a convex mirror is formed at


(a) the object itself


(b) twice the distance of the object in front of the mirror


(c) half the distance of the object in front of the mirror


(d) behind the mirror    


Answer (d) Behind the mirror

 
Question 6. If an incident ray passes through the focus, the reflected ray will


(a) pass through the pole


(b) be parallel to the principal axis


(c) retrace its path


(d) pass through the centre of curvature                                                              


Answer (b) be parallel to the principal axis
 
Question7. When light falls on a smooth polished surface, most of it

(a) is reflected in the same direction


(b) is reflected in different directions


(c) is scattered


(d) is refracted into the second medium      


Answer (a) is reflected in the same direction
 
Question 8. The image formed by reflection from a plane mirror is

(a) real and inverted


(b) virtual and erect


(c) real and erect


(d) virtual and inverted                                                                               


Answer (b) virtual and erect
 
Question9. An object is placed 40.0 cm in front of a convex mirror. The image appears 15 cm behind the mirror. What is the focal length of the mirror?


(a) +24 cm


(b) +11 cm


(c) -11 cm


(d) -24 cm                                                                                   


Answer (d) -24 cm
 
Question10. Light waves


(a) Require air or another gas to travel through


(b) Require an electric field to travel through


(c) Require a magnetic field to travel through


(d) Can travel through a perfect vacuum                                              


Answer (d) Can travel through a perfect vacuum

 
Question11. The focal length of a plane mirror is


(a) zero


(b) infinite


(c) 25 cm


(d) -25                                                                                                                                               

Answer (b) infinite
 
Question12. What will be the position and nature of the image of an object formed by a concave mirror placed between the focus (f) and pole (P) of the mirror?


(a) In between pole (P) and focus (f) in front of mirror, virtual and erect


(b) In between pole (P) and focus (f) in front of mirror, virtual and inverted


(c) Behind the mirror, real and erect


(d) Behind the mirror, virtual and erect


 Answer (d) Behind the mirror, virtual and erect
 
Question13. The image formed by a convex lens can be


(a) virtual and magnified


(b) virtual and diminished


(c) virtual and of the same size


(d) the virtual image is not formed


Answer (a) virtual and magnified
 
Question14. The magnifying power of a concave lens is


(a) always > 1


(b) always < 1


(c) always = 1


(d) can have any value


 Answer (b) always < 1
 
Question15. What will be the position and nature of the image of an object formed by a convex mirror placed between infinity and pole (P) of the mirror?


(a) In between pole (P) and focus (f) behind mirror, virtual and erect


(b) In between pole (P) and focus (f) behind the mirror, virtual and inverted


(c) In front of mirror, real and erect


(d) In front of mirror, virtual and erect


Answer (a) In between pole (P) and focus (f) behind mirror, virtual and erect
 
Question16. A hole is made in a convex lens, then


(a) Image size decreases


(b) Image intensity decreases


(c) Image size decreases


(d) No change


 Answer (c) Image intensity decreases
 
Question17. A full-length image of a distant tall building can definitely be seen by using


(a) a concave mirror


(b) a convex mirror


(c) a plane mirror


(d) both concave as well as plane mirror


Answer (b) a convex mirror
 
Question 18. f = r/2 is valid


(a) For convex mirrors but not for concave mirrors


(b) For concave mirrors but not for convex mirrors


(c) For both convex and concave mirrors


(d) Neither for convex mirrors nor for concave mirrors


Answer (c) For both convex and concave mirrors


Question 19. Two lenses of power +3 and -1 dioptres are placed in contact. The focal length of the combined lens is


(a) 100 cm


(b) 25 cm


(c) 50 cm


(d) 30.3 cm


Answer (c) 50 cm


Question20. Which of the given is not true of an image formed by a plane mirror?


(a) It is erect


(b) It is virtual


(c) It is diminished


(d) It is at the same distance as the object                                                                              


Answer (c) It is diminished
 
Question 19. If the image is formed in front of the mirror, then the image distance will be


(a) positive or negative depending on the size of the object


(b) neither positive nor negative


(c) positive


(d) negative


Answer (d) negative
 
Question 20. A ray of light is traveling from a rarer medium to a denser medium. While entering the denser medium at the point of incidence, it


(a) goes straight into the second medium


(b) bends towards the normal


(c) bends away from the normal


(d) does not enter at all


Answer (b) bends toward the normal
 
Question21. Where an object should be placed in front of a convex lens to get a real image of the size of the object?


(a) At the principal focus of the lens.


(b) At twice the focal length.


(c) At infinity.


(d) Between the optical centre of the lens and its principal focus.


Answer. (b) At twice the focal length.


(When an object is placed in front of a convex lens at 2F1, its real, inverted and same sized image is formed at2F2)
 
Question22. A spherical mirror and a thin spherical lens have each a focal length of --15 cm. The mirror and the lens are likely to be


(a) Both concave.


(b) Both are convex.


(c) The mirror is concave and the lens is convex.


(d) The mirror is convex and the lens is concave.


Answer. Both concave.


(The focal length of a concave lens and a concave mirror are taken negative as per sign convection followed)
 

Question23. If an incident ray passes through the focus, the reflected ray will


(a) pass through the pole


(b) be parallel to the principal axis


(c) retrace its path


(d) pass through the centre of curvature


Answer (b) be parallel to the principal axis
 
Question24. When light falls on a smooth polished surface, most of it


(a) is reflected in the same direction


(c) is scattered


(b) is reflected in different directions


(d) is refracted into the second medium


Answer (a) is reflected in the same direction
 
Question25. The image formed by reflection from a plane mirror is


(a) real and inverted


(b) virtual and erect


(c) real and erect


(d) virtual and inverted


 Answer (b) virtual and erect

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