Chapter 10 · Light - Reflection and Refraction

NCERT Exemplar Class 10 Science Chapter 10 Multiple Choice Questions

All 19 questions of NCERT Exemplar Class 10 Science Chapter 10 Multiple Choice Questions (Light - Reflection and Refraction), in the book's order, each with its answer and a step-by-step solution.

1. Q1
   Which of the following can ​make ​a parallel ​beam ​of light when light ​from a point source is incident on ​it?

   1. (a)Concave mirror as well as convex lens
   2. (b)Convex mirror as well as concave lens
   3. (c)Two plane mirrors placed at $90^{\circ }$ to each other
   4. (d)Concave mirror as well as concave lens
   Show answer

   (a) Concave mirror as well as convex lens

   Step-by-step solution →
2. Q2
   A 10 mm ​long awl pin is placed vertically ​in front ​of a concave mirror. A ​5 mm long image of the awl pin ​is formed ​at 30 cm in front of ​the mirror. The focal ​length of this mirror is

   1. (a)$-30$ cm
   2. (b)$-20$ cm
   3. (c)$-40$ cm
   4. (d)$-60$ cm
   Show answer

   (b) $-20$ cm

   Step-by-step solution →
3. Q3
   Under which of the ​following conditions a ​concave ​mirror can ​form an ​image larger than the ​actual ​object?

   1. (a)When the object is kept at a distance equal to its radius of curvature
   2. (b)When object is kept at a distance less than its focal length
   3. (c)When object is placed between the focus and centre of curvature
   4. (d)When object is kept at a distance greater than its radius of curvature
   Show answer

   (c) When object is placed between the focus and centre of curvature

   Step-by-step solution →
4. Q4
   Figure 10.1 ​shows ​a ​ray of light as it travels ​from medium A to medium B. Refractive index of the medium ​B ​relative to ​medium ​A is

   1. (a)$\sqrt{3}/\sqrt{2}$
   2. (b)$\sqrt{2}/\sqrt{3}$
   3. (c)$1/\sqrt{2}$
   4. (d)$\sqrt{2}$
   Show answer

   (a) $\sqrt{3}/\sqrt{2}$

   Step-by-step solution →
5. Q5
   A ​light ray enters from medium ​A to medium ​B as shown in Figure ​10.2. The ​refractive ​index of medium B relative to A will ​be

   1. (a)greater than unity
   2. (b)less than unity
   3. (c)equal to unity
   4. (d)zero
   Show answer

   (a) greater than unity

   Step-by-step solution →
6. Q6
   Beams of light ​are incident through the holes A and B and emerge out of box through the ​holes C and D ​respectively as ​shown in the Figure10.3. ​Which of the following ​could be inside the box?

   1. (a)A rectangular glass slab
   2. (b)A convex lens
   3. (c)A concave lens
   4. (d)A prism
   Show answer

   (a) A rectangular glass slab

   Step-by-step solution →
7. Q7
   A ​beam of light is incident through the holes on ​side A ​and emerges out of the holes on the ​other face of the box as shown in ​the Figure 10.4. Which of the following ​could be inside ​the box?

   1. (a)Concave lens
   2. (b)Rectangular glass slab
   3. (c)Prism
   4. (d)Convex lens
   Show answer

   (d) Convex lens

   Step-by-step solution →
8. Q8
   Which of the ​following ​statements ​is true?

   1. (a)A convex lens has $4$ dioptre power having a focal length $0.25$ m
   2. (b)A convex lens has $-4$ dioptre power having a focal length $0.25$ m
   3. (c)A concave lens has $4$ dioptre power having a focal length $0.25$ m
   4. (d)A concave lens has $-4$ dioptre power having a focal length $0.25$ m
   Show answer

   (a) A convex lens has $4$ dioptre power having a focal length $0.25$ m

   Step-by-step solution →
9. Q9
   Magnification ​produced ​by a ​rear ​view ​mirror ​fitted in vehicles

   1. (a)is less than one
   2. (b)is more than one
   3. (c)is equal to one
   4. (d)can be more than or less than one depending upon the position of the object in front of it
   Show answer

   (a) is less than one

   Step-by-step solution →
10. Q10
    Rays from Sun converge ​at a ​point ​15 cm in front of a ​concave mirror. Where should ​an object ​be placed so that size of its ​image is ​equal to the size of the object?

    1. (a)15 cm in front of the mirror
    2. (b)30 cm in front of the mirror
    3. (c)between 15 cm and 30 cm in front of the mirror
    4. (d)more than 30 cm in front of the mirror
    Show answer

    (b) 30 cm in front of the mirror

    Step-by-step solution →
11. Q11
    A full ​length image of ​a distant ​tall building ​can ​definitely be seen ​by using

    1. (a)a concave mirror
    2. (b)a convex mirror
    3. (c)a plane mirror
    4. (d)both concave as well as plane mirror
    Show answer

    (b) a convex mirror

    Step-by-step solution →
12. Q12
    In ​torches, search lights and headlights ​of ​vehicles the bulb is placed

    1. (a)between the pole and the focus of the reflector
    2. (b)very near to the focus of the reflector
    3. (c)between the focus and centre of curvature of the reflector
    4. (d)at the centre of curvature of the reflector
    Show answer

    (b) very near to the focus of the reflector

    Step-by-step solution →
13. Q13
    The ​laws ​of ​reflection ​hold good ​for

    1. (a)plane mirror only
    2. (b)concave mirror only
    3. (c)convex mirror only
    4. (d)all mirrors irrespective of their shape
    Show answer

    (d) all mirrors irrespective of their shape

    Step-by-step solution →
14. Q14
    The ​path ​of a ray ​of light coming from air ​passing through a rectangular glass slab traced by four students are shown as A, B, C and D in Figure ​10.5. Which one of them is correct?

    1. (a)A
    2. (b)B
    3. (c)C
    4. (d)D
    Show answer

    (b) B

    Step-by-step solution →
15. Q15
    You ​are given water, ​mustard oil, glycerine and ​kerosene. In which ​of these media ​a ​ray of light incident obliquely at same angle would ​bend the most?

    1. (a)Kerosene
    2. (b)Water
    3. (c)Mustard oil
    4. (d)Glycerine
    Show answer

    (d) Glycerine

    Step-by-step solution →
16. Q16
    Which of the following ray ​diagrams ​is correct for the ray ​of light ​incident on ​a concave mirror ​as ​shown in Figure 10.6?

    1. (a)Fig. A
    2. (b)Fig. B
    3. (c)Fig. C
    4. (d)Fig. D
    Show answer

    (d) Fig. D

    Step-by-step solution →
17. Q17
    Which of the following ray diagrams ​is correct for ​the ray of light ​incident ​on ​a ​lens shown in Fig. 10.7?

    1. (a)Fig. A.
    2. (b)Fig. B.
    3. (c)Fig. C.
    4. (d)Fig. D.
    Show answer

    (a) Fig. A.

    Step-by-step solution →
18. Q18
    A child is standing in ​front of a ​magic ​mirror. She finds the image of her head bigger, the middle portion ​of her body of the same size and that ​of the legs smaller. The following ​is ​the order of combinations for the magic mirror from the top.

    1. (a)Plane, convex and concave
    2. (b)Convex, concave and plane
    3. (c)Concave, plane and convex
    4. (d)Convex, plane and concave
    Show answer

    (c) Concave, plane and convex

    Step-by-step solution →
19. Q19
    In ​which of ​the following, ​the ​image of an ​object ​placed at infinity will ​be highly diminished and ​point sized?

    1. (a)Concave mirror only
    2. (b)Convex mirror only
    3. (c)Convex lens only
    4. (d)Concave mirror, convex mirror, concave lens and convex lens
    Show answer

    (d) Concave mirror, convex mirror, concave lens and convex lens

    Step-by-step solution →