This quiz works best with JavaScript enabled. Home > Cbse > Class 10 > Science > Light Reflection And Refraction > Class 10 Science Chapter 10 Light Reflection And Refraction – Quiz 3 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 10 Science Chapter 10 Light Reflection And Refraction Quiz 3 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. A convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle placed in front of the lens, if image size is equal to the object size? Also, find the power of the lens. A) + 5d. B) +6d. C) 4e. D) +3D. Show Answer Correct Answer: C) 4e. 2. No matter how far you stand from a spherical mirror, your image appears erect. The mirror may be A) Only plane. B) Only convex. C) Either plane or convex. D) Only concave. Show Answer Correct Answer: C) Either plane or convex. 3. Linear Magnification Produced By A Concave Mirror May Be: A) Less than 1 or equal to 1. B) Less than 1, more than 1 or equal to 1. C) Less than 1 or more than 1. D) More than 1 or equal to 1. Show Answer Correct Answer: B) Less than 1, more than 1 or equal to 1. 4. A10 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 A) -20 cm. B) -40cm. C) -30 cm. D) -60cm. Show Answer Correct Answer: A) -20 cm. 5. Recently, In A Science Class Test, You Are Asked A Question Where You Have To Say Whether The Statements Are Correct Or Not? A) The angle between incident ray and normal is called the angle of incidence. B) The angle between the refracted ray and the normal is called the angle of refraction. C) In refraction of light, the angle of refraction is usually not equal to the angle of incidence. D) All the above. Show Answer Correct Answer: C) In refraction of light, the angle of refraction is usually not equal to the angle of incidence. 6. What particles make up light? A) Photons. B) Neutrons. C) Protons. D) None of the above. Show Answer Correct Answer: A) Photons. 7. 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. Show Answer Correct Answer: B) Virtual and erect. 8. The rear view mirror of a car is a plane mirror. A driver is reversing his car at a speed of 2 m/s. The driver sees in his rear view mirror the image of truck parked behind his car. The speed at which the image of the truck appears to approach the driver will be- A) 8 m/s. B) 1 m/s. C) 2 m/s. D) 4 m/s. Show Answer Correct Answer: B) 1 m/s. 9. You are given three media A, B and C of refractive index 1.33, 1.65 and 1.46. The medium in which the light will travel fastest is A) A. B) B. C) C. D) Equal in all three media. Show Answer Correct Answer: A) A. 10. An object is placed at a distance of 30 cm from a concave lens of focal length 30cm. Use lens formula to determine the distance of the image from the lens? A) 30cm. B) 15 cm. C) -15cm. D) -30cm. Show Answer Correct Answer: C) -15cm. 11. Assertion:Pupil is black in color.Reason:Pupil is black in color as no light is reflected in it. A) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion. B) The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion. C) Assertion is true but the Reason is false. D) The statement of the Assertion is false but the Reason is true. Show Answer Correct Answer: A) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion. 12. A full length image of a distant tall building can definitely beseen by using A) Concave mirror. B) Convex mirror. C) Plane mirror. D) Both concave and plane mirror. Show Answer Correct Answer: B) Convex mirror. 13. According to laws of reflection of light- A) (A) Angle of incidence is equal to the angle of reflection. B) B) Angle of incidence is less than the angle of reflection. C) (C) Angle of incidence is greater than the angle of reflection. D) (D) None of these. Show Answer Correct Answer: A) (A) Angle of incidence is equal to the angle of reflection. 14. An object is placed at a distance of 10cm from a convex mirror of focal length 15cm.find the position and nature of the image A) V =-3cm, real & inverted. B) V = +15cm, virtual & erect. C) V =-6cm, real & inverted. D) V = +6cm, virtual & erect. Show Answer Correct Answer: D) V = +6cm, virtual & erect. 15. Light has the highest velocity in which medium?flint glass n=1.70barium glass n=1.60crown glass n=1.523water n=1.33diamond n=2.45 A) Barium glass. B) Water. C) Diamond. D) Flint glass. Show Answer Correct Answer: B) Water. 16. A convex and a concave lens of equal focal length behaves as a regular glass slab receiving light normally. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 17. Image formed by a convex spherical mirror is? A) Inverted. B) Virtual. C) Enlarged. D) Real. Show Answer Correct Answer: B) Virtual. 18. A medium in which light travels comparatively faster than the other medium is called an A) Optically denser medium. B) Optically rarer medium. C) Optical liquid medium. D) Optical solid medium. Show Answer Correct Answer: B) Optically rarer medium. 19. How does the angle of refraction change with the angle of incidence? A) The angle of refraction is inversely proportional to the angle of incidence. B) The angle of refraction changes in relation to the angle of incidence based on Snell's Law. C) The angle of refraction decreases as the angle of incidence increases. D) The angle of refraction remains constant regardless of the angle of incidence. Show Answer Correct Answer: B) The angle of refraction changes in relation to the angle of incidence based on Snell's Law. 20. A lens of focal length 12 cm forms an erect image, three times the size of the object. The distance between the object and image is: A) 36 cm. B) 8 cm. C) 16 cm. D) 24 cm. Show Answer Correct Answer: B) 8 cm. 21. The power of a lens having focal length 50 cm is- A) 3D. B) 0.2 D. C) 0.5D. D) 2D. Show Answer Correct Answer: D) 2D. 22. A concave mirror produces three times magnified image on a screen. If the object is placed 20 cm in front of the mirror, how far is the screen from the object? A) 40cm. B) -60cm. C) -40cm. D) 60cm. Show Answer Correct Answer: C) -40cm. 23. A concave mirror produces a magnification of + 4. The object is placed:(a) at the focus (b) between focus and centre of curvature (c) between focus and pole (d) beyond the centre of curvatur A) B. B) A. C) D. D) C. Show Answer Correct Answer: D) C. 24. Define refractive index. A) Refractive index is the force of gravity acting on light in a material. B) Refractive index is the amount of light absorbed by a material. C) Refractive index is the ratio of the speed of light in a vacuum to the speed of light in the material. D) Refractive index is the measure of temperature in a material. Show Answer Correct Answer: C) Refractive index is the ratio of the speed of light in a vacuum to the speed of light in the material. 25. Which mirror convex or concave has larger field of view? A) Concave mirror. B) Convex mirror. C) Both. D) None of the above. Show Answer Correct Answer: B) Convex mirror. 26. Two lenses of power +2.5 D and-3.75 D are combined to form a compound lens. Its focal length in cm will be A) -40. B) -80. C) 80. D) 40. Show Answer Correct Answer: B) -80. 27. The unit of power of lens is A) M-1. B) Diopter. C) Centimetre. D) Metre. Show Answer Correct Answer: B) Diopter. 28. An illuminated object is placed at a distance of 20 cm from a converging lens of focal length 15 cm. The image obtained on the screen is:(a) upright and magnified (b) inverted and magnified (c) inverted and diminished (d) upright and diminished A) D. B) A. C) C. D) B. Show Answer Correct Answer: D) B. 29. What sign is given to the focal length of a concave mirror A) Positive sign. B) Negative sign. C) Any one positive or negative. D) None of the above. Show Answer Correct Answer: B) Negative sign. 30. The minimum distance between an object and its real image formed by a convex lens of focal length f is- A) 2f. B) F. C) 4f. D) 3f. Show Answer Correct Answer: C) 4f. 31. An object is placed in between two plane mirrors whose reflecting surfaces are placed facing parallel to each other. Infinite images of the object are formed but only a few are visible because: A) The intensity of the images decreases after each reflection. B) The intensity of the images increases after each reflection. C) Images are infinite only theoretically. D) Of the size of the plane mirrors. Show Answer Correct Answer: A) The intensity of the images decreases after each reflection. 32. When light passes from air to water, what happens to the speed of the light? A) Speeds up. B) Slows down. C) Stays the same. D) None of the above. Show Answer Correct Answer: B) Slows down. 33. If a magnification of, -1 (minus 1) is obtained by using a converging lens, then the object has to be placed:(a) within f (b) at 2f (c) beyond 2f (d) at infinity A) A. B) D. C) C. D) B. Show Answer Correct Answer: D) B. 34. The deviation of light ray from its path when it travels from one transparent medium to another transparent medium is called A) Dispersion. B) Reflection. C) Scattering. D) Refraction. Show Answer Correct Answer: D) Refraction. 35. A ray of light is travelling from a rarer medium to a denser medium. While entering the denser medium at the point of incidence, it A) Does not enter at all. B) Goes straight into the second medium. C) Bends away from the normal. D) Bends towards the normal. Show Answer Correct Answer: D) Bends towards the normal. 36. If the power of a lens is-2 D, what is its focal length? A) -50 cm. B) +100 cm. C) -100 cm. D) +50 cm. Show Answer Correct Answer: A) -50 cm. 37. Which of the following mirror is used by a dentist to examine a small cavity? A) Convex mirror. B) Plane mirror. C) Concave mirror. D) Combination of convex and concave mirror. Show Answer Correct Answer: C) Concave mirror. 38. Which of the following mirrors is used by Archimedes to burn the ships? A) Bi-concave. B) When the time. C) Convex. D) Concave. Show Answer Correct Answer: D) Concave. 39. Convex lens focus a real, point sized image at focus, the object is placed A) At focus. B) Between F and 2F. C) At infinity. D) At 2F. Show Answer Correct Answer: C) At infinity. 40. No matter how far you stand from a spherical mirror, your image appears erect. The mirror may be plane or convex mirror. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 41. What is refraction of light? A) Refraction of light is the reflection of light off a surface. B) Refraction of light is the scattering of light in all directions. C) Refraction of light is the bending of light as it passes from one medium to another due to a change in its speed. D) Refraction of light is the absorption of light by a medium. Show Answer Correct Answer: C) Refraction of light is the bending of light as it passes from one medium to another due to a change in its speed. 42. In torches, search lights and headlights of vechicles the buld is placed A) Between the pole and the focus of the reflector. B) Very near to 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. Show Answer Correct Answer: B) Very near to the focus of the reflector. 43. An object at a distance of 30 cm from aconcave mirror gets its image at the same point. The focal length of the mirror is A) -15 cm. B) -30 cm. C) 30 cm. D) +15 cm. Show Answer Correct Answer: A) -15 cm. 44. What three things may happen to light that strikes an object? A) The light may be reflected, transmitted or absorbed. B) The light may be reflected and refracted. C) The light may be absorbed and transmitted. D) None of the above. Show Answer Correct Answer: A) The light may be reflected, transmitted or absorbed. 45. Give an example of a situation where refraction of light occurs. A) A pencil in a glass of water. B) A straw placed in a glass of water. C) A rock in a pond. D) A book on a table. Show Answer Correct Answer: B) A straw placed in a glass of water. 46. Where will be the images of the Sun or the moon are formed by a concave mirror? A) Pole. B) Focus. C) Centre of curvature. D) Beyond centre of curvature. Show Answer Correct Answer: B) Focus. 47. A mirror having focal length-15 cm is ..... A) Plane mirror. B) Concave mirror. C) Convex mirror. D) None of these. Show Answer Correct Answer: B) Concave mirror. 48. The optical phenomena, twinkling of stars, is due to A) Atmospheric refraction. B) Atmospheric reflection. C) Total reflection. D) Total refraction. Show Answer Correct Answer: A) Atmospheric refraction. 49. A clock hung on a wall has marks instead of numbers on its dial. On the opposite wall there is a mirror, and the image of the clock in the mirror if read, indicates the time as 8.20. What is the time in the clock- A) 5.20. B) 4.20. C) 3.40. D) 4.40. Show Answer Correct Answer: D) 4.40. 50. A spherical mirror and a spherical lens each have a focal length of-10 cm. The mirror and the lens are likely to be A) The mirror is convex and the lens is concave. B) The mirror is concave and the lens is convex. C) Both convex. D) Both concave. Show Answer Correct Answer: D) Both concave. 51. A concave mirror has a focal length of 25 cm. A person wants to see his face in this mirror. At what distance should the person stand? A) 40 cm. B) 30 cm. C) 25 cm. D) 20 cm. Show Answer Correct Answer: D) 20 cm. 52. First law of reflection states that the angle of incidence is ..... angle of reflection. A) Greater than. B) Less than. C) Equal to. D) None of these. Show Answer Correct Answer: C) Equal to. 53. A ray of light is incident normally on a rectangular piece of glass. The value of angle of refraction will be- A) 90$^\circ$. B) 180$^\circ$. C) 45$^\circ$. D) 0$^\circ$. Show Answer Correct Answer: D) 0$^\circ$. 54. 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 A) -20 cm. B) -60 cm. C) -30 cm. D) -40 cm. Show Answer Correct Answer: A) -20 cm. 55. The speed of light in substance X is $1.25\times10^8$ $3\times10^8$ A) D. B) B. C) A. D) C. Show Answer Correct Answer: C) A. 56. What is the SI unit of power of a lens? A) Diopter (D). B) M$^{-1}$. C) Volts (V). D) Patls (j). Show Answer Correct Answer: A) Diopter (D). 57. An object that allows light to go through ..... light. A) Transmits. B) Reflect. C) Absorbs. D) Refract. Show Answer Correct Answer: A) Transmits. 58. What does reflection mean? A) Bending light. B) Bouncing light. C) All the above. D) None of the above. Show Answer Correct Answer: B) Bouncing light. 59. State Snell's Law. A) The wavelength of light changes when passing through different mediums. B) The speed of light is constant in all mediums. C) The angle of incidence is equal to the angle of reflection. D) The ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant when light passes from one medium to another. Show Answer Correct Answer: D) The ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant when light passes from one medium to another. 60. What is the angle between the incident and reflected rays when a ray of light is incident normally on a plane mirror? A) 0$^{0}$. B) 45$^{0}$. C) 180$^{0}$. D) 90$^{0}$. Show Answer Correct Answer: A) 0$^{0}$. ← PreviousNext →Related QuizzesScience QuizzesClass 10 QuizzesClass 10 Science Chapter 10 Light Reflection And Refraction Quiz 1Class 10 Science Chapter 10 Light Reflection And Refraction Quiz 2Class 10 Science Chapter 10 Light Reflection And Refraction Quiz 4 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books