Light is a fundamental concept in physics, and understanding its properties and behavior is crucial for students in Class 10. Multiple Choice Questions (MCQs) are an effective way to test and reinforce your knowledge of this topic.
MCQs on light class 10 practice now
We’ll explore a set of carefully curated MCQs on Light for Class 10 students. These questions will cover various aspects of light, including its nature, propagation, reflection, refraction, and optical devices. By attempting these MCQs, you’ll not only assess your understanding but also prepare yourself for upcoming exams and develop a deeper comprehension of this fascinating subject.
Light is a form of electromagnetic radiation that travels in the form of waves. It is a crucial concept in physics and plays a vital role in our ability to see and understand the world around us.
Nature of Light:
- Light can behave as both a wave and a particle, exhibiting properties of both.
- The wave nature of light is responsible for phenomena like interference, diffraction, and polarization.
- The particle nature of light is explained by the concept of photons, which are discrete packets of energy.
Propagation of Light:
- Light travels in a straight line in a homogeneous medium.
- The speed of light in a vacuum is approximately 3 × 10^8 m/s, which is the highest possible speed in the universe.
- When light travels from one medium to another, it undergoes refraction, changing its direction and speed.
Reflection and Refraction:
- Reflection occurs when light bounces off a surface, following the laws of reflection.
- Refraction occurs when light bends as it passes from one medium to another with a different optical density.
- These phenomena are responsible for the formation of images by mirrors and lenses.
Optical Devices:
- Mirrors (plane, concave, and convex) are used to reflect light and form images.
- Lenses (convex and concave) are used to refract light and form images.
- These devices have various applications in cameras, telescopes, microscopes, and other optical instruments.
For MCQs on optics click here
Light class 10 MCQ online test
Q1. The laws of reflection hold true for:
(A) Plane mirrors only
(B) Concave mirrors only
(C) Convex mirrors only
(D) All reflecting surfaces
Show Answer
(D) All reflecting surfaces, as they have a Have Confusion Discuss➛
Q2. When an object is kept within the focus of a concave mirror, an enlarged image is formed behind the mirror. This image is:
(A) Real
(B) Inverted
(C) Virtual and inverted
(D) Virtual and erect
Q3. Length of a given concave mirror, you focus the image of a distant object formed by the mirror on a screen. The image obtained on the screen, as compared to the object is always:
(A) Laterally inverted and diminished
(B) Inverted and diminished
(C) Erect and diminished
(D) Erect and highly diminished
Q4. Which of the following can make a parallel beam of light when light from a point source is incident on it?
(A) Concave mirror as well as convex lens
(B) Convex mirror as well as concave lens
(C) Two plane mirrors placed at 90° to each other
(D) Concave mirror as well as concave lens
Q5. Magnification produced by a rear-view mirror fitted in vehicles
(A) is less than one
(B) is more than one
(C) is equal to one
(D) can be more than or less than one depending upon the position of the object in front of it
Q6. In torches, search lights and headlights of vehicles, the bulb 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
Q7. A student obtains a blurred image of a distant object on a screen using a convex lens. To obtain a distinct image on the screen he should move the lens
(A) Away from the screen
(B) Towards the screen
(C) To a position very far away from the screen (D) Either towards or away from the screen depending upon the position of the object
Q8. A spherical mirror and a thin spherical lens each have a focal length of -15 cm. The mirror and the lens are likely to be
(A) Both concave
(B) Both convex
(C) The mirror is concave and the lens is convex
(D) The mirror is convex, but the lens is concave
Q9. Which of the following lenses would you prefer to use while reading small letters found in a dictionary?
(A) A convex lens of focal length 50 cm
(B) A concave lens of focal length 50 cm
(C) A convex lens of focal length 5 cm
(D) A concave lens of focal length 5 cm
Q10. At what distance, in terms of focal length ‘f’ of the mirror, should he place the candle flame to get the magnified image on the wall ? (A) At F
(B) Between F and C
(C) At C
(D) At infinity
Q11. To get the diminished image of the candle flame, the object must be placed at:
(A) Infinity
(B) At C
(C) Between F and C
(D) At F
Q12. If the image formed by this mirror is inverted and real, the magnification will be:
(A) Positive
(B) Negative
(C) Either of them
(D) None of the above
Q13. A virtual image formed by concave mirror is:
(A) Erect and enlarged
(B) Erect and diminished
(C) Inverted and diminished
(D) Inverted and enlarged
Q14. What is the change in image observed as the object is moved from infinity towards the concave lens?
(A) Size of image decreases
(B) Size of image becomes highly diminished (C) Size of the image remains unchanged
(D) Size of the image increases slightly
Q15. Which of the following statement is false for the formation of images by convex lens? (A) It forms real,inverted and diminished image
(B) It forms virtual erect and enlarged image
(C) It forms virtual, erect, and diminished image
(D) It forms real,inverted and enlarged image
Q16. Light travel fastest in:
(A) Air
(B) Vacuum
(C) Glass
(D) Diamond
Q17. When the distance between the object and the plane mirror increases
(A) The image remains same
(B) The size of the image will become less than the size of the object
(C) The distance between the image and the plane mirror increases
(D) The distance between the image and the plane mirror decreases
Q18. The sun is seen before the actual sunrise because of
(A) Reflection
(B) Refraction
(C) Scattering of light
(D) Rectilinear propagation of light
Q19. Butter paper is an example for …………. object.
(A) A transparent
(B) A translucent
(C) An opaque
(D) A luminous
Q20. Power of accommodation of eye implies (a) control intensity
(b) prevent internal reflection of light
(c) change of focal length of eye lens
(d) All of the above
Q21. Which of the following parts of eye protects the eye and gives it shape?
(a) Choroid
(b) Sclera
(c) Yellow spot
(d) Ciliary muscles
Q22. The human eye forms the image of an object at its
(a) Cornea
(b) Iris
(c) Pupil
(d) Retina
Q23. Rainbow is caused due to
(a) Reflection of sun light from air particles
(b) Dispersion of sun light from water drops
(c) Interference of light
(d) Diffraction of sun rays from water drops
Q24. In the visible spectrum the colour having the shortest wavelength is
(a) Green
(b) Red
(c) Violet
(d) blue
Q25. The splitting of white light into seven colours on passing through a glass prism is due to
(a) Refraction
(b) Reflection
(c) Interference
(d) Diffraction
Q26. A mirage occurs because
(a) The refractive index of atmosphere increases with height
(b) The refractive index of atmosphere decreases with height
(c) The hot ground acts like a mirror
(d) Refractive index remains constant with height
Q27. A well cut diamond appears bright because
(a) of reflection of light
(b) of dispersion of light
(c) of the total internal reflection
(d) of refraction of light
Q28. Twinkling of stars is on account of
(a) large distance of stars and storms in air
(b) small size of stars
(c) large size of stars
(d) large distance of stars and fluctuations in the density of air
Q29. ‘The stars seem to be higher on the sky than they actually are’. This can be explained by
(a) atmospheric refraction
(b) dispersion of light
(c) total internal reflection
(d) diffraction of light
Q30. Yellow colour light is used as fog light because yellow colour
(a) light is most scattered by fog
(b) has the longest wavelength among all colours
(c) has the longest wavelength among all colours except red and orange but the red colour is already used for brake light and stop light whereas orange colour is avoided due to its similarity with red
(d) has the shortest wavelength among all colours
Q31. At noon the sun appears white as
(A) Light is least scattered
(B) All the colours of the white light are scattered away
(C) Blue colour is scattered the most
(D) Red colour is scattered the most
Q32. The clear sky appears blue because
(A) Blue light gets absorbed in the atmosphere (B) Ultraviolet radiations are absorbed in the atmosphere
(C) Violet and blue lights get scattered more than light of all other colours by the atmosphere
(D) Light of all other colours is scattered more than the violet and blue colour light by the atmosphere
Q33. Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset? (A) Dispersion of light
(B) Scattering of light
(C) Total internal reflection of light
(D) Reflection of light from the earth
Q34. The mirror used for the headlight of a car is
(a) spherical concave
(b) plane
(c) cylindrical
(d) parabolic concave
Q35. Soap bubble looks coloured due to
(a) Dispersion
(b) Reflection
(c) Interference
(d) Any one of these
Q36. A star is emitting yellow light. If it is accelerated towards earth then to an observer on earth, it will appear
(a) Shinning yellow
(b) Gradually changing to violet
(c) Gradually changing to red
(d) Unchanged
Q37. Rear-view mirror used in a vehicle is a
(a) Concave mirror
(b) Convex mirror
(c) Plane mirror
(d) None of these
Q38.The fine powder of a coloured glass is seen as
(a) coloured
(b) white
(c) black
(d) that of the glass colour
Q39. The acronym for LASER is
(a) Light Amplification by Stimulated Emission of Radiation
(b) Low Amplitude Stimulated Emission of Radiation
(c) Low Amplitude Short Energy Radiation
(d) Light Amplification by Short Energy Radiation
Q40. The least distance of distinct vision of a normal eye of an adult is
(a) 25 m
(b) 25 cm
(c) 25 mm
(d) None of these
Get Best MCQs Book on General Science
What is the nature of light?
Light has two different behaviors: it can act like a wave or as a stream of particles called photons. Its particle nature explains the quantized energy transfer seen in some processes, while its wave nature explains phenomena like interference and diffraction.
What is the speed of light?
The speed of light in a vacuum is a constant, approximately 3 x 10^8 meters per second. It is the maximum possible speed at which energy, matter, and information can travel in the universe, according to Einstein’s theory of relativity.
What is refraction of light?
The bending of a light beam as it travels obliquely between two media with differing refractive indices is known as refraction. The difference in light speed between the two media is the cause of this direction shift.
What are the laws of reflection?
The incident ray, reflected ray, and normal to the surface at the point of incidence all reside in the same plane, according to the two laws of reflection, and the angle of incidence is equal to the angle of reflection.
What are the applications of lenses?
Optical instruments such as cameras, telescopes, microscopes, and corrective glasses all employ lenses. Concave lenses are used to diverge and correct vision problems like myopia (nearsightedness), while convex lenses are used for magnification.