Daksh Dudi
SCI
Class 07 - Science
Time Allowed: 3 hours Maximum Marks: 157
1. What type of image can be obtained by a convex mirror? [1]
2. Why is an image formed by a convex mirror virtual? [1]
3. Which type of mirror can form a real image? [1]
4. What are convex lenses? [1]
5. What type of images are formed by a concave lens? [1]
6. How many reflected rays can be there for a single given incident ray falling on a [1]
plane mirror?
7. What are converging and diverging lens? [1]
8. What is the nature of image formed by a convex lens? [1]
9. What is the colour of light formed by mixing of seven colours of rainbow? [1]
10. The concave reflecting surface of a torch got rusted. What effect would this have on [2]
the beam of light from the torch?
11. Find out the letters of English alphabet or any other language known to you in which [2]
the image formed in a plane mirror appears exactly like the letter itself. Discuss your
findings.
12. State two effects of rectilinear propagation of light. [2]
13. What is an image? [2]
14. What is rainbow? [2]
15. State two differences between a convex and a concave lens. [2]
16. Seema dropped a water droplet on a newspaper. [2]
She found that the letters are appearing larger through the droplet.
Why are the letters appearing larger through the droplet?
17. Why is convex lens called converging lens and concave lens called diverging lens? [2]
18. The picture shows the size of the pupil under two different conditions. [2]
What makes the pupil change size between conditions 1 and 2?
19. Microscopes are used to view microorganisms. [2]
What type of lens is used in a microscope?
20. Rohan found out that solar panels use special mirrors shaped like the inside of a [2]
spoon, called concave mirrors, but he doesn't understand why. Why do you think
these spoon-shaped mirrors help solar panels work better?
21. The image formed by a lens is always virtual, erect, and smaller in size for an object [2]
kept at different positions in front of it. Identify the nature of the lens.
22. Mention differences between real and virtual images. [2]
23. Write the characteristics of image formed by a plane mirror. [2]
24. Why do we need a shiny surface for reflection? [2]
25. Explain why the word AMBULANCE is written as in figure. [2]
26. State the correct sequence (1-7) of colours in the spectrum formed by the prisms A [2]
and B, shown in Figures.
27. A shopkeeper wanted to fix a mirror which will give a maximum view of his shop. [2]
What type of mirror should he use? Give reason.
28. What is a virtual image? Give one situation where a virtual image is formed. [2]
29. Boojho made light from a laser torch to fall on a prism. Will he be able to observe a [2]
band of seven colours? Explain with a reason.
30. An erect and enlarged image of an object is formed on a screen. Explain how this [2]
could be possible.
31. The distance between an object and a convex lens is changing. It is noticed that the [2]
size of the image formed on a screen is decreasing. Is the object moving in a
direction towards the lens or away from it?
32. Why is convex mirror used as side mirror in scooters? [2]
33. Here are given capital letters of the English Alphabet encircle the letters which will [2]
not show lateral inversion on facing a plane mirror.
34. State the characteristics of the image formed by a plane mirror. [2]
35. Two different types of lenses is placed on a sheet of newspaper. How will you [2]
identify them without touching?
36. Show that when seven colours are mixed together then white colour is formed. [2]
Explain with the help of an activity.
37. Does a convex lens form only real images? Justify your answer with an example. [3]
38. On what factors does the formation of an image depend? [3]
39. The distance of an object behind a car cannot be judged by just looking at the side [3]
mirror. Give reason.
40. Rohan found out that glasses for seeing better use convex lenses, but he doesn't [3]
understand why. Why do you think these lenses are used in glasses to help people
see clearly? Explain how these lenses help by changing the way light enters the eye,
and give examples of the kinds of vision problems they fix.
41. Explain that light has the property of rectilinear propagation. [3]
42. Give the set up of an experiment to show the rectilinear propagation of light. [3]
43. Distinguish between real and virtual image. [3]
44. Suppose we wish to obtain the real image of a distant tree. Explain two possible [3]
ways in which we can do it.
45. Why side mirrors of motor vehicles are labelled with the safety warning ‘Objects in [3]
the mirror are closer than they appear’?
46. How is an image formed on a plane mirror? [3]
47. A convex lens converges light. Explain. [3]
48. Boojho planned activity to observe an object A through pipes as shown in the [4]
figure, so that he could see objects which he could not directly see.
a. How many mirrors should he use to see the objects?
b. Indicate the positions of the mirrors in the figure.
c. What must be the angle with respect to the incident light at which he should
place the mirrors?
d. Indicate the direction of the rays in the figure.
e. If any of the mirrors is removed, will he be able to see the objects?
49. Identify the image and write a note on it giving real life example [4]
50. Write the properties of the images formed by a plane, concave and convex mirror [4]
and also concave and convex lenses.
51. It was observed that when the distance between an object and a lens decreases, [4]
the size of the image increases. What is the nature of this lens? If you keep on
decreasing the distance between the object and the lens, will you still able to obtain
the image on the screen? Explain.
52. Identify the image and answer the following questions. [4]
1. What kind of image is formed by such type of lens?
2. Write the uses of such type of lens.
53. Identify the image and answer the following questions. [4]
What kind of image forms on the concave surface of a spoon?
Is it an erect image or an upside-down one?
Is it an image like that formed in a plane mirror?
What kind of image forms on the convex surface of the spoon?
Is it an upside-down image?
54. You are given three mirrors of different types. How will you identify each one of [4]
them?
55. Explain the uses of concave and convex mirror and also concave and convex lenses. [4]
56. State the uses of [4]
i. Concave mirror
ii. Convex mirror
iii. Concave lens
iv. Convex lens.
57. What is lateral inversion? What is its practical use? [4]
58. Write the properties of the image formed by a (i) plane mirror (ii) concave mirror (iii) [4]
convex mirror (iv) concave lens and (v) convex lens.
59. Assertion (A): Mirror used in headlights of cars are concave mirrors . [1]
Reason (R): concave mirror and convex mirror are spherical mirrors.
a) Both A and R are true and R is b) Both A and R are true but R is
the correct explanation of A. not the correct explanation of
A.
c) A is true but R is false. d) A is false but R is true.
60. Assertion (A): Image formed by concave lens is always virtual,erect and smaller than [1]
size of object.
Reason (R): Concave lens diverges the light rays.
a) Both A and R are true and R is b) Both A and R are true but R is
the correct explanation of A. not the correct explanation of
A.
c) A is true but R is false. d) A is false but R is true.
61. Assertion (A): AMBULANCE is always written inverted. [1]
Reason (R): It follows the phenomenon of lateral inversion.
a) Both A and R are true and R is b) Both A and R are true but R is
the correct explanation of A. not the correct explanation of
A.
c) A is true but R is false. d) A is false but R is true.
62. Assertion (A): Lenses are widely used in spectacles, telescopes and microscopes. [1]
Reason (R): Those lenses which feel thicker in the middle than at the edges are
concave lenses.
a) Both A and R are true and R is b) Both A and R are true but R is
the correct explanation of A. not the correct explanation of
A.
c) A is true but R is false. d) A is false but R is true.
63. Assertion (A): Image which can be obtained on screen is called real image. [1]
Reason (R): Because reflected ray and refracted ray seems to be intersect.
a) Both A and R are true and R is b) Both A and R are true but R is
the correct explanation of A. not the correct explanation of
A.
c) A is true but R is false. d) A is false but R is true.
64. Assertion (A): Light does not change its direction. [1]
Reason (R): Light always travel in a straight path.
a) Both A and R are true and R is b) Both A and R are true but R is
the correct explanation of A. not the correct explanation of
A.
c) A is true but R is false. d) A is false but R is true.
65. Assertion (A): Dentist use concave mirror to examine the teeth. [1]
Reason (R): Concave mirror forms a virtual, erect and enlarged view of the objects.
a) Both A and R are true and R is b) Both A and R are true but R is
the correct explanation of A. not the correct explanation of
A.
c) A is true but R is false. d) A is false but R is true.
66. Assertion (A): If the reflecting surface is convex, then it is a convex mirror. [1]
Reason (R): The inner surface of a spoon acts like a convex mirror, while its outer
surface acts like a concave mirror.
a) Both A and R are true and R is b) Both A and R are true but R is
the correct explanation of A. not the correct explanation of
A.
c) A is true but R is false. d) A is false but R is true.
67. Assertion (A): The curved shining surface of a spoon acts as a mirror. [1]
Reason (R): If the reflecting surface of a spherical mirror is concave, it is called a
convex mirror.
a) Both A and R are true and R is b) Both A and R are true but R is
the correct explanation of A. not the correct explanation of
A.
c) A is true but R is false. d) A is false but R is true.
68. Assertion (A): An image formed by a plane mirror is virtual and of the same size as [1]
the object.
Reason (R): The change in the direction of light by a mirror is called the reflection of
light.
a) Both A and R are true and R is b) Both A and R are true but R is
the correct explanation of A. not the correct explanation of
A.
c) A is true but R is false. d) A is false but R is true.
69. Assertion (A): the change in the direction of light through a mirror is called the [1]
reflection of light.
Reason (R): light can travel through both bend and straight manner.
a) Both A and R are true and R is b) Both A and R are true but R is
the correct explanation of A. not the correct explanation of
A.
c) A is true but R is false. d) A is false but R is true.
70. Assertion (A): Image formed by cancave lens is always virtual, erect and smaller in [1]
size than the object.
Reason (R): Concave lens is used as a magnifying glass.
a) Both A and R are true and R is b) Both A and R are true but R is
the correct explanation of A. not the correct explanation of
A.
c) A is true but R is false. d) A is false but R is true.
71. Assertion (A): Anita burns the candle and then tried to see the candle through a [1]
bent pipe but she is not able to see the light.
Reason (R): Light travel in a straight line.
a) Both A and R are true and R is b) Both A and R are true but R is
the correct explanation of A. not the correct explanation of
A.
c) A is true but R is false. d) A is false but R is true.
72. Assertion (A): rainbow can only be seen when you are standing facing towards the [1]
sun.
Reason (R): The sunlight is a mixture of different colours.
a) Both A and R are true and R is b) Both A and R are true but R is
the correct explanation of A. not the correct explanation of
A.
c) A is true but R is false. d) A is false but R is true.
73. Assertion (A): Convex lens is converging lens. [1]
Reason (R): convex lens converged all light rays at a point.
a) Both A and R are true and R is b) Both A and R are true but R is
the correct explanation of A. not the correct explanation of
A.
c) A is true but R is false. d) A is false but R is true.
74. Assertion (A): The word AMBULANCE in front was written in a strange manner on [1]
ambulance.
Reason (R): When the driver of a vehicle ahead of an ambulance looks in her/his rear
view mirror, she/he can read AMBULANCE written on it and give way to it.
a) Both A and R are true and R is b) Both A and R are true but R is
the correct explanation of A. not the correct explanation of
A.
c) A is true but R is false. d) A is false but R is true.
75. Assertion (A): It is dangerous to look through a convex lens at the Sun or a bright [1]
light.
Reason (R): A convex lens converges (bends inward) the light generally falling on it.
a) Both A and R are true and R is b) Both A and R are true but R is
the correct explanation of A. not the correct explanation of
A.
c) A is true but R is false. d) A is false but R is true.
