Question

Class 7 Science MCQ Questions of Light with Answer?

Answer 1

Students are recommended to practice the MCQ Questions with Answers for Class 7 Science in order to be familiar with the kind of questions appearing in the exam. Make the most out of these MCQ Quiz Questions for Class 7 Science and stand out from the rest of the crowd by scoring maximum Marks.

Class 7 Science MCQ Questions of Light with Answer aids students to have stronger basics and covers all the concepts of Science. Access the MCQ Questions with Answers of Class 7 Science and get a good grip on the concepts thereby attempt the exam with confidence.

Practice MCQ Questions for Class 7 Science

1. The path of the light is

(a) always a straight line
(b) a curved line
(c) a zig-zag line
(d) depends on the medium

2. Which one shows lateral inversion?

(a) Plane mirror
(b) Convex mirror
(c) Concave mirror
(d) All of these

3. Image formed by a plane mirror is

(a) virtual and erect
(b) real and erect
(c) virtual and inverted
(d) real and inverted

4. Boojho and Paheli were given one mirror each by their teacher. Boojho found his image to be erect and of the same size whereas Paheli found her image erect and smaller in size. This means that the mirrors of Boojho and Paheli are, respectively

(a) plane mirror and concave mirror
(b) concave mirror and convex mirror
(c) plane mirror and convex mirror
(d) convex mirror and plane mirror

5. Which of the following can be used to form a real image?

(a) Concave mirror only
(b) Plane mirror only
(c) Convex mirror only
(d) Both concave and convex mirrors

6. If an object is placed at a distance of 0.5 m in front of a plane mirror, the distance between the object and the image formed by the mirror will be

(a) 2 m
(b) 1 m
(c) 0.5 m
(d) 0.25 m

7. You are provided with a concave mirror, a convex mirror, a concave lens and a convex lens. To obtain an enlarged image of an object you can use either

(a) concave mirror or convex mirror
(b) concave mirror or convex lens
(c) concave mirror or concave lens
(d) concave lens or convex lens

8. An erect and enlarged image can be formed by

(a) only a convex mirror
(b) only a concave mirror
(c) only a plane mirror
(d) both convex and concave mirror

9.  An image formed by a lens is erect. Such an image could be formed by a

(a) convex lens provided the image is smaller than object
(b) concave lens provided the image is smaller than object
(c) concave lens provided the image is larger than object
(d) concave lens provided the image is of the same size

10. Change in the path of light after striking a mirror is called

(a) reflection of light
(b) Rectilinear propagation of light
(c) Lateral inversion
(d) Dispersion

11. Splitting of white light into seven colours is called

(a) reflection of light
(b) Rectilinear propagation of light
(c) Lateral inversion 
(d) Dispersion

12. When white light is passed into a prism it splits into 

(a) Seven colours  
(b) Eight colours 
(c) Five colours 
(d) Three colours

13. The middle colour in sunlight spectrum is:

(a) yellow
(b) green
(c) blue
(d) orange

14. The image formed by a convex mirror is:

(a) erect and diminished
(b) erect and enlarged
(c) inverted and diminished
(d) inverted and enlarged

15. The image which can be caught on a screen is called

(a) Real image  
(b) Virtual image 
(c) Shadow
(d) Impression

16. The object in which seven colours spread over it appears to be white in colour when rotated is Called

(a) Galileo’s disc
(b) Newton’s disc
(c) Rutherford’s disc
(d) Faraday’s disc

17. When the Newton's disc is rotated what happens

(a) The colours fade to white
(b) The colours fade to black
(c) Rutherford’s disc
(d) Faraday’s disc

18. Rectilinear propagation is

(a) mode of travelling in curved lines
(b) mode of travelling in straight lines
(c) ability to bend around obstacles
(d) displaying the phenomenon of diffraction

19. Which of the following is used as a side view mirror?

(a) Plane mirror
(b) Concave mirror
(c) Convex mirror
(d) Convex lens

20. Looking through a lens at the sun or a bright light is:

(a) easy
(b) dangerous
(c) difficult
(d) good

21. Which colour of light scattered least

(a) Green
(b) Yellow
(c) Red
(d) Blue

22. The coloured band of light obtained by dispersion of light is called

(a) image
(b) spectrum
(c) convergence
(d) scattering

23. Light is a form of

(a) Energy
(b) Power
(c) Heat
(d) Temperature

24. ..............refers to collection of rays.

(a) Shadow
(b) Photon
(c) Beam
(d) Image

25. Concave lens is also known as

(a) Converging lens
(b) Diverging lens
(c) Bifocal length
(d) Biconcave lens

Answer 2

1. Answer: (a) always a straight line

Explanation: The path of light is always a straight line. About pathway of light the rectilinear propagation of light is the process of light traveling in a straight line without encountering any obstacles.

2. Answer: (a) Plane mirror

Explanation: Plane Mirror shows lateral inversion. The appearance of image in right hand side as left hand side and vice versa is known as lateral inversion. The image formed by a plane mirror is always laterally inverted.

3. Answer: (a) virtual and erect

Explanation: The image formed by a plane mirror is always virtual (meaning that the light rays do not actually come from the image), upright, and of the same shape and size as the object it is reflecting. A virtual image is a copy of an object formed at the location from which the light rays appear to come.

4. Answer: (c) plane mirror and convex mirror

Explanation: When the image is erect and of same size as object then it is a plane mirror so Boojho has plane mirror. When the image is erect and of small size than object then it is a convex mirror so Paheli has a convex mirror

5. Answer: (b) Plane mirror only

Explanation: A plane mirror can be used to form a real image equal in size as of the object.

6. Answer: (b) 1 m

Explanation: The image formed by a plane mirror is always virtual and erect. The images formed from plane mirrors are the reflected images in their normal proportions but reversed from left to right. These are the most widely used mirrors.The image formed by a plane mirror is at the same distance behind the mirror as the object is in front of it.

  The distance between object and image is given by the distance between object and mirror + distance between mirror and image

The distance between the object and mirror = 0.5 m

The distance between mirror and image = 0.5 m

Distance between object and mirror + distance between mirror and image 

= 0.5 m + 0.5 m 

= 1 m

7. Answer: (b) concave mirror or convex lens

Explanation: The correct answer is option (b), Concave mirror or convex lens. Enlarged images are formed by only concave mirror or convex lens.

8. Answer: (b) only a concave mirror

Explanation: But the concave mirror forms a virtual, erect and enlarged image only when the object is placed between the Focus and the pole of the mirror. There is no such mirror as Concave or Convex mirror. 

9. Answer: (b) concave lens provided the image is smaller than object

Explanation: A convex lens forms erect and magnified image only when object is close to lens otherwise it forms inverted image. A concave lens forms erect and smaller image than object always.

10. Answer: (a) reflection of light

Explanation: In smooth and shiny surfaces, the path of light changes at the same angle as it hits the surface. This phenomenon is called reflection.

11. Answer: (d) Dispersion

Explanation: Splitting of white light into different colors is called dispersion. This property results from different speed of each wavelength in a medium due to property of refraction of that medium.

12. Answer: (a) Seven colours  

Explanation: A prism splits a beam of white light into seven colours because different colours have different. Prism splits a beam of white light into seven colours because different colours have different speeds due to different wavelengths.

13. Answer: (b) green

Explanation: As violet,indigo,blue,green,yellow,orange and red are the colours of the spectrum.Hence,green is the middle colour in sunlight spectrum.

14. Answer: (a) erect and diminished

Explanation: The image formed in a convex mirror is always erect, virtual and diminished in size.Convex mirrors image is usually formed behind the mirror, it is virtual and erect. Location of the image is always between the focal point and vertex of the mirror.

15. Answer: (a) Real image

Explanation: Real images can be caught on screen. It can be seen that the image is formed by actual light rays and thus can form a visible image on a screen placed at the position of the image.

16. Answer: (b) Newton’s disc

Explanation: Newton's Color Disk when rotated, appears white. Newton's Color Disk is mounted on a motor shaft. When the motor is turned on, the disk rotates rapidly. The segments of color on the disc are apportioned so that, when the disc is rotating, an approximate white is formed by the mixing of the colors.

17. Answer: (b) The colours fade to black

Explanation: Newton's colour disc, as the name suggests, was invented by Sir Issac Newton and is a disc with seven segments in rainbow colours. When the disc is rotated, the colours fade to white. In this way, Sir Isaac Newton demonstrated that white light is a combination of the seven different colours found in a rainbow.

18. Answer: (b) mode of travelling in straight lines

Explanation: This process of light travelling along a straight line without any interference in its path is called the rectilinear propagation of light. Thus, we can say that rectilinear propagation is mode of travelling in straight lines.

19. Answer: (c) Convex mirror

Explanation: Convex mirrors are used as side view mirrors as they have a wider field of view. Convex mirrors form virtual, erect and diminished images of the object placed in front of it. All these characteristics of a convex mirror are ideal for a side view mirror.

20. Answer: (b) dangerous

Explanation: A convex lens can focus the sunlight to a point to such an intensity that can burn paper, wood, plastic, etc. This intense light can easily damage and distort our eye lens. So, it is dangerous to look at the sun through a convex lens.

21. Answer: (c) Red

Explanation: Rayleigh scattering states that the longer the wavelength of radiation, the less it is dispersed. The higher the scattering, the shorter the wavelength of light; this is why blue or violet light scatters the most and red light scatters the least.

22. Answer: (b) spectrum

Explanation: Dispersion is the phenomenon of splitting of polychromatic light into its constituent colours. The band of colours obtained on the screen on passing white light through a prism is called a spectrum.

23. Answer: (a) Energy

Explanation: Light is a form of energy that travels as waves. Their length  or wavelength determines many of light's properties. For instance, wavelength accounts for light's color and how it will interact with matter. 

24. Answer: (c) Beam

Explanation: A collection of large no. of rays of light is called beam.

25. Answer: (b) Diverging lens

Explanation: Concave lenses are thinner at the middle. Rays of light that pass through the lens are spread out (they diverge). A concave lens is a diverging lens.

Click here for Practice MCQ Questions for Light Class 7