MCQ Questions for Class 10 Science Light – Reflection and Refraction Chapter 9 : This collection of multiple-choice questions is designed to assist students in their study of the topic of light, reflection, and refraction in Class 10. Covering important concepts such as laws of reflection, refraction, spherical mirrors, lenses, and optical instruments, these questions offer a comprehensive assessment of knowledge and understanding. With clear options and answers provided, students can evaluate their progress and strengthen their understanding of this fascinating chapter.
MCQ Questions for Class 10 Science Chapter-9 Light – Reflection and Refraction
Q1. Light waves do not require any material medium for travelling hence called
(a) electromagnetic waves
(b) Air waves
(c) Light wave
(d) Free wave in motion
Ans. electromagnetic waves.
Q2. The speed of light in a vacuum is
(a) 3 × 10⁶ m/s.
(b) 3 × 10⁷ m/s
(c) 3 × 10⁸ m/s.
(d) 3 × 10⁹ m/s.
Ans. 3 × 10⁸ m/s.
Q3. Bundle of light rays is called
(a) Group of light
(b) Beam of light
(c) Straight chain of light
(d) None of these
Ans. Beam of light.
Q4. Which of the following statements is incorrect?
(a) When light falls on a transparent surface it changes its path, bends and gets refracted.
(b) If light travels from a denser medium to a rarer medium it bends away from the normal.
(c) When light travels from a rarer medium to a denser medium it bends towards the Incident Ray.
(d) Real image is formed due to actual meeting of light rays at a point after reflection or refraction.
Ans. When light travels from rarer medium to denser medium it bends towards the Incident Ray.
Q5. Which of the following ” LAWS OF REFLECTION ” is correct ?
(a) The angle of incidence (i) is equal to the angle of reflection (r)
(b) The incident ray, the normal ray and the reflected ray, all lie in the same plane.
(c) Both are correct
(d) None of these
Ans. Both are correct.
Q6. Which of the following is incorrect regarding “Image Formed by Plane Mirror” ?
(a) It is the same size, real and erect.
(b) The image is laterally inverted.
(c) Formed behind the mirror as the object is in front of it.
(d) The size of the image is the same as the size of the object.
Ans. It is the same size, real and erect.
Q7. Which of the following statements are correct regarding “Convex Mirror”?
(1) It’s a mirror that has a reflecting surface away from the centre of curvature.
(2) It is Converging mirror.
(3) Its Centre of Curvature lies behind the mirror.
(a) (1) and (2) statements are correct regarding convex mirror
(b) (1) and (3) statements are correct regarding convex mirror
(c) (2) and (3) statements are correct regarding convex mirror
(d) All the above statements are correct regarding convex mirror
Ans. (1) and (3) statements are correct regarding convex mirror.
Q8. Which of the following statements are correct regarding “Concave lens “?
(1) A concave lens is thinner in the middle and thicker at the edges.
(2) It is also known as Diverging Lens.
(3) It diverges the incident rays away from the principal axis.
(a) (1) and (2) statements are correct regarding convex mirror
(b) (1) and (3) statements are correct regarding convex mirror
(c) (2) and (3) statements are correct regarding convex mirror
(d) All the above statements are correct regarding convex mirror
Ans. All the above statements are correct regarding convex mirror.
Q9. What is Snell’s law?
(a) The incident ray, the refracted ray and the normal to the separating surface at the point of incidence all lie in the same plane.
(b) The incident ray, the normal ray and the reflected ray, all lie in the same plane. It is known as Snell’s law.
(c) The ratio of sine of the angle of incidence (i) to the sine of angle of refraction (r) is a constant. It is known as Snell’s law.
(d) None of the above
Ans. The ratio of sine of the angle of incidence (i) to the sine of angle of refraction (r) is a constant. It is known as Snell’s law.
Q10. Name a mirror that can give an erect and enlarged image of an object.
(a) Plane Mirror
(b) Concave Mirror
(c) Convex Mirror
(d) None of these
Ans. Concave Mirror.
Q11. Assertion (A) – Concave mirror is used as a rear-view mirror.
Reason (R) – Concave mirrors converge in nature.
(a) Both, A and R, are true and R is the correct explanation of A
(b) Both, A and R, are true but R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
Ans. A is false but R is true.
Q12. When light falls on a surface, then what happen:
(a) Reflection
(b) Reflection
(c) Absorption
(d) All the above
Ans. All the above.
Q13. In a concave lens, Light rays from the object are parallel to the principal axis.
Ray Diagram
How it appears after refraction
(a) After refraction from a concave lens, the ray appears to diverge from the principal focus located on the same side of the lens
(b) After refraction from a concave lens, the ray appears to diverge from the principal focus located on the same side of the lens
(c) After refraction from a concave lens will emerge without any deviation
(d) None of the above
Ans. After refraction from a concave lens, the ray appears to diverge from the principal focus located on the same side of the lens.
Q14. In torches, searchlights and headlights of vehicles the bulb is placed
(a) between the pole and the focus of the reflector
(b) at the focus of the reflector
(c) between the focus and centre of curvature of the reflector
(d) at the centre of curvature of the reflector
Ans. at the focus of the reflector.
Q15. A ray of light that strikes a plane mirror PQ at an angle of incidence of 30°, is reflected from the plane mirror and then strikes a second plane mirror QR placed at right angles to the first mirror. The angle of reflection at the second mirror is:
(a) 30°
(b) 45°
(c) 60°
(d) 90°
Ans. 60°.
Q16. A man standing in front of a special mirror finds his image having a very small face, a fat body and legs of normal size. Then he concluded that the special mirror was a combination of different types of mirrors with its top, middle and bottom parts made of
(a) Convex, plane and concave mirrors respectively.
(b) Plane, convex and concave mirrors respectively.
(c) Concave, convex and plane mirrors respectively.
(d) Convex, concave and plane mirrors respectively.
Ans. Convex, concave and plane mirrors respectively.
Q17. When a ray of light goes from one medium to another, there is
(a) Always a change in its speed as well as direction
(b) A change in speed but no change in direction
(c) No change in speed and direction
(d) A change in direction but constant speed
Ans. Always a change in its speed as well as direction.
Q18. Assertion (A): When a concave mirror is held underwater, its focal length will increase.
Reason (R): The focal length of a concave mirror is independent of the medium in which it is placed.
(a) Both (A) and (R) are true and (R) is the correct explanation of the assertion.
(b) Both (A) and (R) are true, but (R) is not the correct explanation of the assertion.
(c) (A) is true, but (R) is false
(d) (A) is false, but (R) is true.
Ans. (A) is false, but (R) is true.
Q19. Assertion (A) -Focal length of plane mirror is infinity.
Reason (R) – Plane mirror forms inverted image.
(a) Both (A) and (R) are true and (R) is the correct explanation of the assertion.
(b) Both (A) and (R) are true, but (R) is not the correct explanation of the assertion.
(c) (A) is true, but (R) is false
(d) (A) is false, but (R) is true.
Ans. (A) is true, but (R) is false.
Q20. In concave mirror
• position of object – at infinity
• position of the image – at the focus F
• nature of image – real and inverted
Then what is the size of the image –
(a) Highly diminished, point sized
(b) Highly enlarged
(c) Diminished
(d) Enlarged
Ans. Highly diminished, point sized.
21. In convex mirror, position of object is between infinity and the pole P of the mirror, size of the image is diminished and nature of the image is virtual and erect and then the position of image is
(a) at the focus f, behind the mirror
(b) behind the mirror at infinity
(c) behind the mirror beyond c
(d) between p and f, behind the mirror
Ans. between p and f, behind the mirror.
22. The _________ is the ratio of the velocity of light in one medium to the velocity of light in another medium.
(a) Reflection
(b) Refraction
(c) Refractive Index
(d) None of the above
Ans. Refractive Index.
23. Which of the following laws is correct “regarding law of reflection”.
(1) The angle between the incident ray and the normal is equal to the angle between the reflected ray and the normal.
(2) The incident ray, the normal and the reflected ray are all in the same plane.
(3) Incident ray and refracted ray are on different sides of the normal.
(a) (1) and (2) are correct regarding law of reflection
(b) (1) and (3) are correct regarding law of reflection
(c) (2) and (3) are correct regarding law of reflection
(d) All the above are correct regarding law of reflection
Ans. All the above are correct regarding law of reflection.
24. Which of the following is not Properties of Light.
(a) Electromagnetic waves do not require any medium to travel.
(b) Light tends to travel in a straight line.
(c) Light has dual nature i.e. wave as well as particle.
(d) Speed of light is maximum in vacuum. Its value is 3 x 10⁸ km.
Ans. Speed of light is maximum in vacuum. Its value is 3 x 10⁸ km.
25. A light ray travelling obliquely from a denser medium to a rarer medium bends away from the normal. A light ray bends towards the normal when it travels obliquely from a
(a) rarer to a denser medium
(b) denser to a rarer medium
(c) rarer to a rarer medium
(d) denser to a denser medium
Ans. rarer to a denser medium.
26. In the case of a rectangular glass slab, the refraction takes place at both air-glass Interface and glass-air interface. The emergent ray is parallel to
(a) the direction of the reflection ray.
(b) the direction of the parallel beam.
(c) the direction of the incident ray.
(d) the direction of the emergent ray.
Ans. the direction of the incident ray.
27. Mirrors and lenses form images of objects. Images can be either real or virtual depending on
(a) the size of the object.
(b) the position of the object.
(c) distance of the object from the mirror and lenses.
(d) All of the above
Ans. the position of the object.
28. The magnification produced by a spherical mirror is the ratio of :-
(a) the height of the image to the height of the object.
(b) the height of the object to the height of the image.
(c) position of the object to the distance of the image.
(d) position of the object to the distance of the spherical mirror.
Ans. the height of the image to the height of the object.
29. In concave lens,
• Position of image – between focus F1 and optical centre O
• Relative size of image – diminished
• nature of the image – virtual and erect
Then Position of the object is :-
(a) At infinity
(b) between infinity and the Pola P of the lens
(c) between focus F and optical centre O
(d) between infinity and optical centre O of the lens
Ans. between infinity and optical centre O of the lens.
30. Which of the following statements is incorrect.
(a) Power of a lens is the reciprocal of its focal length. The SI unit of power of a lens is dioptre.
(b) The refractive index of a transparent medium is the ratio of the speed of light in vacuum to that in the medium.
(c) The reflecting surfaces, of all types, obey the laws of reflection. The refracting
surfaces obey the laws of refraction.
(d) The focal length of a spherical mirror is equal to its radius of curvature.
Ans. The focal length of a spherical mirror is equal to its radius of curvature.
31. What is the primary function of light?
a) Producing heat
b) Enabling vision
c) Generating sound
d) Creating color
Answer: b) Enabling vision
32. Who predicted that light is carried by electromagnetic waves?
a) Isaac Newton
b) Albert Einstein
c) James Clerk Maxwell
d) Thomas Edison
Answer: c) James Clerk Maxwell
33. According to the concept of wave-particle duality, light exhibits both __ nature.
a) Solid
b) Liquid
c) Particle
d) Wave
Answer: d) Wave
34. Which phenomenon can be explained by considering light as a wave?
a) Photoelectric effect
b) Refraction
c) Interference
d) Absorption
Answer: c) Interference
35. What are the particles of light called in the photoelectric effect?
a) Electrons
b) Protons
c) Photons
d) Neutrons
Answer: c) Photons
36. In the photoelectric effect, light behaves as a __.
a) Wave
b) Particle
c) Solid
d) Liquid
Answer: b) Particle
37. What happens when light travels from one medium to another?
a) It disappears
b) It gets absorbed
c) It changes color
d) It reflects
Answer: b) It gets absorbed
38. When light is incident on a plane mirror, most of it gets __.
a) Absorbed
b) Refracted
c) Scattered
d) Reflected
Answer: d) Reflected
39. The speed of light is a constant, approximately __.
a) 3.0 x 10^8 m/s
b) 1.0 x 10^6 m/s
c) 5.0 x 10^7 m/s
d) 9.8 x 10^9 m/s
Answer: a) 3.0 x 10^8 m/s
40. Which of the following phenomena can be explained by considering light as a wave?
a) Polarization
b) Photoelectric effect
c) Absorption
d) Reflection
Answer: a) Polarization
41. In the laws of reflection, what is the relationship between the incident ray, reflected ray, and the normal?
a) They are parallel.
b) They form a right angle.
c) They are perpendicular.
d) They are at random angles.
Answer: b) They form a right angle.
42. What is the angle of incidence equal to, according to the laws of reflection?
a) The angle of refraction
b) The angle of absorption
c) The angle of reflection
d) The angle of the normal
Answer: c) The angle of reflection
43. Which medium will cause regular reflection of light when polished without irregularities?
a) A rough surface
b) A transparent medium
c) A translucent medium
d) A well-polished medium
Answer: d) A well-polished medium
44. What does the symbol ‘c’ represent in the speed of light equation?
a) Frequency
b) Wavelength
c) Speed of sound
d) Speed of light
Answer: d) Speed of light
45. Which equation represents the speed of light?
a) c = λ/μ
b) c = λ + μ
c) c = λ – μ
d) c = λ * μ
Answer: a) c = λ/μ
46. What is the speed of light in meters per second (m/s)?
a) 2.998 x 10^8 m/s
b) 1.0 x 10^6 m/s
c) 5.0 x 10^7 m/s
d) 9.8 x 10^9 m/s
Answer: a) 2.998 x 10^8 m/s
47. Which type of reflection occurs when a medium is well-polished without irregularities?
a) Diffuse reflection
b) Regular reflection
c) Total internal reflection
d) Refraction
Answer: b) Regular reflection
48. According to the laws of reflection, what relationship exists between the incident and reflected angles?
a) They are always equal.
b) They are always different.
c) They are always random.
d) They depend on the medium.
Answer: a) They are always equal.
49. Which phenomenon can be explained by considering light as a particle?
a) Diffraction
b) Polarization
c) Refraction
d) Photoelectric effect
Answer: d) Photoelectric effect
50. In the laws of reflection, what is the relationship between the incident ray and the reflected ray?
a) They are parallel.
b) They are perpendicular.
c) They form a right angle.
d) They are at random angles.
Answer: a) They are parallel.