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Class 7 Science Chapter 13 Practice Question Answers - Light
Q1. Which of the following best explains why we cannot see around corners?
(a) Light bends around objects
(b) Light travels in a straight line
(c) Light is absorbed by objects
(d) Light disappears when it hits an obstacle
Answer: (b) Light travels in a straight line
Explanation: Light follows a straight-line path in a uniform medium, preventing us from seeing around corners.
Q2. What happens when light falls on a highly polished surface?
(a) It gets absorbed
(b) It bends at a large angle
(c) It gets reflected
(d) It travels through the surface
Answer: (c) It gets reflected
Explanation: A polished surface acts as a mirror and reflects most of the light falling on it.
Q3. Which of the following statements about reflection is incorrect?
(a) The angle of incidence is always equal to the angle of reflection
(b) Reflection only occurs on plane surfaces
(c) Light changes direction upon reflection
(d) Reflection follows the law of reflection
Answer: (b) Reflection only occurs on plane surfaces
Explanation: Reflection can occur on both plane and curved surfaces.
Q4. Why does an image in a plane mirror appear laterally inverted?
(a) The mirror absorbs the left side of the image
(b) Light rays from different parts of the object cross over
(c) The image is flipped by the mirror
(d) The laws of reflection reverse the image
Answer: (d) The laws of reflection reverse the image
Explanation: A plane mirror reverses left and right due to the way light rays reflect.
Q5. If you stand 3 metres away from a plane mirror, how far will your image appear from you?
(a) 3 metres
(b) 6 metres
(c) 1.5 metres
(d) 9 metres
Answer: (b) 6 metres
Explanation: The image forms behind the mirror at the same distance as the object, so the total distance is 3 m (object) + 3 m (image) = 6 m.
Q6. Which mirror is used in rear-view mirrors of vehicles?
(a) Plane mirror
(b) Concave mirror
(c) Convex mirror
(d) Cylindrical mirror
Answer: (c) Convex mirror
Explanation: Convex mirrors provide a wider field of view but form smaller, upright images.
Q7. Which type of mirror can form both real and virtual images?
(a) Plane mirror
(b) Convex mirror
(c) Concave mirror
(d) None of these
Answer: (c) Concave mirror
Explanation: A concave mirror forms a real, inverted image when the object is beyond the focal point and a virtual, erect image when the object is within the focal point.
Q8. What happens to the size of an image in a concave mirror when an object moves towards the mirror?
(a) The image gets smaller
(b) The image gets larger
(c) The image remains the same size
(d) The image disappears
Answer: (b) The image gets larger
Explanation: In a concave mirror, as the object moves closer, the image size increases and can become magnified.
Q9. Which of the following lenses is used as a magnifying glass?
(a) Convex lens
(b) Concave lens
(c) Plane lens
(d) Cylindrical lens
Answer: (a) Convex lens
Explanation: A convex lens converges light, forming an enlarged, virtual image when the object is within the focal length.
Q10. Which lens is used to correct myopia (short-sightedness)?
(a) Convex lens
(b) Concave lens
(c) Plane lens
(d) None of these
Answer: (b) Concave lens
Explanation: A concave lens diverges light, helping myopic individuals focus distant objects properly.
Q11. Why does a concave lens always form a virtual image?
(a) It converges light rays
(b) It does not refract light
(c) It diverges light rays
(d) It absorbs light
Answer: (c) It diverges light rays
Explanation: A concave lens spreads light rays apart, so they never actually meet to form a real image.
Q12. What happens when white light passes through a prism?
(a) It remains white
(b) It splits into seven colours
(c) It becomes black
(d) It bends at a small angle
Answer: (b) It splits into seven colours
Explanation: This phenomenon, called dispersion, occurs because different colours bend at different angles.
Q13. The bending of light when it passes from one medium to another is called:
(a) Reflection
(b) Refraction
(c) Dispersion
(d) Scattering
Answer: (b) Refraction
Explanation: Light bends because it changes speed when moving between different mediums.
Q14. Which of the following statements about real images is true?
(a) They can be formed on a screen
(b) They are always erect
(c) They can only be formed by plane mirrors
(d) They are not formed by concave mirrors
Answer: (a) They can be formed on a screen
Explanation: Real images are formed when light rays actually meet.
Q15. What type of image does a convex mirror always form?
(a) Real and inverted
(b) Virtual and erect
(c) Enlarged and real
(d) Smaller and real
Answer: (b) Virtual and erect
Explanation: A convex mirror always forms a diminished, virtual, and upright image.
Q16. Why do doctors use concave mirrors?
(a) To get a wider field of view
(b) To magnify images
(c) To form inverted images
(d) To reflect light away
Answer: (b) To magnify images
Explanation: Concave mirrors provide magnified, upright images when used for close-up viewing.
Q17. What happens when an object is placed at the focal point of a concave mirror?
(a) No image is formed
(b) A highly magnified image is formed
(c) The image is at infinity
(d) The image is inverted and the same size
Answer: (c) The image is at infinity
Explanation: Light rays become parallel, making the image appear at infinity.
Q18. Why do rainbows form after rain?
(a) Water droplets absorb light
(b) Light gets reflected inside raindrops
(c) Sunlight disperses through water droplets
(d) Raindrops act as mirrors
Answer: (c) Sunlight disperses through water droplets
Explanation: Each raindrop acts as a prism, breaking sunlight into seven colours.
Q19. Which type of lens is used in a camera to focus light?
(a) Convex lens
(b) Concave lens
(c) Plane lens
(d) Cylindrical lens
Answer: (a) Convex lens
Explanation: A convex lens converges light to a focus, forming a real image on the camera sensor or film.
Q20. Which type of mirror is used in streetlights to spread light over a large area?
(a) Plane mirror
(b) Concave mirror
(c) Convex mirror
(d) None of these
Answer: (c) Convex mirror
Explanation: Convex mirrors spread light over a wider area, making them useful in streetlights.
Q21. Why do objects appear upside down when viewed through a concave mirror from a distance?
(a) Light rays from the object cross at the focal point
(b) The object is too far from the mirror
(c) The mirror absorbs some light
(d) The mirror does not reflect light properly
Answer: (a) Light rays from the object cross at the focal point
Explanation: When an object is placed beyond the focus of a concave mirror, light rays meet after reflection, forming an inverted real image.
Q22. Why do concave mirrors produce magnified images when the object is close?
(a) The mirror absorbs extra light
(b) The reflected rays appear to meet behind the mirror
(c) The mirror is not curved properly
(d) The object is in front of the focal point
Answer: (d) The object is in front of the focal point
Explanation: When an object is between the focal point and mirror, the image formed is magnified, erect, and virtual.
Q23. Why are convex mirrors preferred for traffic and security purposes?
(a) They form real and large images
(b) They form a wide, diminished image
(c) They form multiple images
(d) They block extra light
Answer: (b) They form a wide, diminished image
Explanation: Convex mirrors provide a larger field of view, making them useful for traffic and security surveillance.
Q24. What happens to the size of a real image formed by a convex lens when the object moves closer to the lens?
(a) It gets smaller
(b) It gets larger
(c) It remains the same
(d) It disappears
Answer: (b) It gets larger
Explanation: As an object moves closer to a convex lens, the real image becomes bigger and moves farther away.
Q25. Which of the following is NOT a property of a virtual image?
(a) It cannot be obtained on a screen
(b) It is always inverted
(c) It is formed by plane and convex mirrors
(d) It is formed by converging light rays
Answer: (b) It is always inverted
Explanation: A virtual image cannot be captured on a screen and formed by plane and convex mirrors.
Q26. What is the role of the iris in our eyes?
(a) Focuses light onto the retina
(b) Detects colors
(c) Controls the amount of light entering the eye
(d) Converts light into signals for the brain
Answer: (c) Controls the amount of light entering the eye
Explanation: The iris adjusts the size of the pupil to regulate how much light enters the eye.
Q27. Why does a pencil appear bent when placed in a glass of water?
(a) Due to reflection
(b) Due to refraction
(c) Due to absorption
(d) Due to scattering
Answer: (b) Due to refraction
Explanation: Light bends when moving from water to air, making the pencil appear bent.
Q28. What is the function of the retina in the human eye?
(a) Protects the eye from dust
(b) Controls the movement of the eye
(c) Converts light into electrical signals
(d) Bends light rays to focus on an object
Answer: (c) Converts light into electrical signals
Explanation: The retina contains light-sensitive cells that convert light into nerve impulses for the brain.
Q29. Which colour of light bends the most when passing through a prism?
(a) Red
(b) Yellow
(c) Violet
(d) Green
Answer: (c) Violet
Explanation: Violet light bends the most due to its shortest wavelength, while red light bends the least.
Q30. Why should we never look directly at the Sun through a convex lens?
(a) It makes the Sun appear smaller
(b) It blocks the Sun’s rays
(c) It can concentrate sunlight and damage the eyes
(d) It makes the Sun appear dimmer
Answer: (c) It can concentrate sunlight and damage the eyes
The document Class 7 Science Chapter 13 Practice Question Answers - Light is a part of the Class 7 Course Science Class 7.
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FAQs on Class 7 Science Chapter 13 Practice Question Answers - Light
| 1. What is light and why is it important in our daily lives? |  |
| 2. What are the different sources of light? | |
Ans. There are two main types of light sources: natural and artificial. Natural sources include the sun and stars, while artificial sources encompass various human-made items like electric bulbs, lamps, and candles. Each source emits light in different intensities and colors, contributing to our visual experiences.
| 3. How does light travel, and what is its speed? | |
Ans. Light travels in straight lines and can move through different mediums such as air, water, and glass. The speed of light in a vacuum is approximately 299,792 kilometers per second (or about 186,282 miles per second). However, its speed can change when it passes through different materials, causing phenomena like refraction.
| 4. What is reflection of light, and how does it occur? | |
Ans. Reflection of light occurs when light rays bounce off a surface. This process takes place at the boundary between two different media, such as air and a mirror. The angle at which the light hits the surface (the angle of incidence) is equal to the angle at which it reflects away (the angle of reflection), following the law of reflection.
| 5. What is refraction, and where do we see it in everyday life? | |
Ans. Refraction is the bending of light as it passes from one medium to another, causing a change in its speed. This phenomenon can be observed in everyday life, such as when a straw appears bent in a glass of water or when we see a rainbow in the sky. Refraction is also the principle behind lenses used in glasses and cameras.
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