CBSE Class 7 Science Chapter 11: Light: Shadows and Reflections — Assertion & Reason
CBSE Class 7 Science Assertion & Reason
Expert crafted · Instant PDF download · 2026-27
The following Assertion and Reason questions are based on Chapter 11: Light: Shadows and Reflections from the NCERT Class 7 Science textbook Curiosity. Each question has four options — read both the Assertion (A) and Reason (R) carefully before selecting your answer.
How to attempt Assertion & Reason questions:
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is NOT the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is NOT the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Assertion & Reason Questions
1
Assertion (A): The Sun and fireflies are examples of luminous objects.
Reason (R): Objects that emit their own light are called luminous objects.
Reason (R): Objects that emit their own light are called luminous objects.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. Since both the Sun and fireflies naturally emit their own light, they fit the exact definition of a luminous object.
2
Assertion (A): The Moon is considered a non-luminous object.
Reason (R): The Moon does not emit its own light but merely reflects the sunlight that falls on it.
Reason (R): The Moon does not emit its own light but merely reflects the sunlight that falls on it.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. Because the Moon lacks its own light source and relies entirely on reflection, it is classified as non-luminous.
3
Assertion (A): A person cannot see a candle flame if they look at it through a bent pipe.
Reason (R): Light travels in a straight line and cannot bend around the curve of the pipe.
Reason (R): Light travels in a straight line and cannot bend around the curve of the pipe.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. The inability to see through a bent pipe is direct evidence of the rectilinear propagation (straight-line movement) of light.
4
Assertion (A): A clear glass window pane is an example of an opaque material.
Reason (R): Transparent materials allow light to pass through them almost completely.
Reason (R): Transparent materials allow light to pass through them almost completely.
Answer: (d)
A is false, but R is true. A clear glass window is transparent, not opaque, because it allows light to pass through it almost completely.
5
Assertion (A): Tracing paper and frosted glass are considered translucent materials.
Reason (R): Translucent materials allow light to pass through them only partially.
Reason (R): Translucent materials allow light to pass through them only partially.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. Because these materials scatter the light passing through them, objects on the other side cannot be seen clearly, making them translucent.
6
Assertion (A): Shadows are formed when an opaque object is placed in the path of light.
Reason (R): Because light travels in a straight line, it cannot pass through the opaque object, leaving a dark patch behind it.
Reason (R): Because light travels in a straight line, it cannot pass through the opaque object, leaving a dark patch behind it.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. The physical blockage of straight-traveling light rays by an opaque material is the exact mechanism that creates a shadow.
7
Assertion (A): The colour of a shadow changes if we change the colour of the opaque object casting it.
Reason (R): Shadows are simply dark patches formed where light does not reach.
Reason (R): Shadows are simply dark patches formed where light does not reach.
Answer: (d)
A is false, but R is true. Changing the colour of an opaque object does not change the colour of its shadow; the shadow will always remain a dark patch because it is an absence of light.
8
Assertion (A): A shadow cannot be observed without a screen.
Reason (R): The wall of a room, the ground, or any other physical surface acts as a necessary screen to capture and display the shadow.
Reason (R): The wall of a room, the ground, or any other physical surface acts as a necessary screen to capture and display the shadow.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. For a shadow to be visible to our eyes, the unblocked light must land on a surface (screen) to contrast with the dark patch.
9
Assertion (A): A plane mirror can be used to redirect a beam of sunlight into a dark corner of a room.
Reason (R): A shiny surface or a mirror changes the direction of light that falls upon it through the process of reflection.
Reason (R): A shiny surface or a mirror changes the direction of light that falls upon it through the process of reflection.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. Mirrors effectively bounce light rays in new directions, which allows us to actively redirect sunlight.
10
Assertion (A): The image formed by a plane mirror can be easily caught and displayed on a piece of paper or screen placed behind it.
Reason (R): The image formed by a plane mirror is of the same size as the actual object.
Reason (R): The image formed by a plane mirror is of the same size as the actual object.
Answer: (d)
A is false, but R is true. The image formed by a plane mirror is virtual and cannot be obtained on a screen. However, it is true that the image is the same size as the object.
11
Assertion (A): The image formed by a plane mirror is always inverted (upside down).
Reason (R): An image that appears right-side up is called an erect image.
Reason (R): An image that appears right-side up is called an erect image.
Answer: (d)
A is false, but R is true. Images formed by plane mirrors are erect (upright), not upside down. The definition of an erect image is correct.
12
Assertion (A): If you raise your left arm in front of a plane mirror, your image appears to raise its right arm.
Reason (R): This perceived left-right reversal in a mirror image is called lateral inversion.
Reason (R): This perceived left-right reversal in a mirror image is called lateral inversion.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. The switching of left and right sides in a reflection is a standard property of plane mirrors known as lateral inversion.
13
Assertion (A): The word AMBULANCE is written backwards on the front of emergency vehicles.
Reason (R): The rear-view mirror of the vehicle ahead reverses the image laterally, making the word readable to the driver.
Reason (R): The rear-view mirror of the vehicle ahead reverses the image laterally, making the word readable to the driver.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. This is a practical application of lateral inversion, ensuring drivers can quickly read and give way to the ambulance.
14
Assertion (A): When you step closer to a plane mirror, your reflected image appears to move further away from the mirror.
Reason (R): The apparent distance of the image behind the plane mirror is equal to the distance of the object in front of the mirror.
Reason (R): The apparent distance of the image behind the plane mirror is equal to the distance of the object in front of the mirror.
Answer: (d)
A is false, but R is true. When you step closer, your image also steps closer. This happens because the image distance is always equal to the object distance.
15
Assertion (A): A pinhole camera forms an inverted (upside down) image of an object on its translucent screen.
Reason (R): Light travels in a straight line, causing the light rays from the top and bottom of the object to cross each other at the tiny pinhole.
Reason (R): Light travels in a straight line, causing the light rays from the top and bottom of the object to cross each other at the tiny pinhole.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. The rectilinear propagation of light forces the rays to intersect at the small opening, which flips the resulting image on the screen.
16
Assertion (A): A simple periscope is constructed using two plane mirrors placed in a Z-shaped box.
Reason (R): The reflection of light from the two angled mirrors enables a person to see objects that are not directly in their line of sight.
Reason (R): The reflection of light from the two angled mirrors enables a person to see objects that are not directly in their line of sight.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. The successive reflections bounce the light around obstacles, which is the functional purpose of building a periscope.
17
Assertion (A): A kaleidoscope creates new and beautiful patterns every time it is turned.
Reason (R): A kaleidoscope contains three plane mirrors that create multiple images due to the reflections of reflections.
Reason (R): A kaleidoscope contains three plane mirrors that create multiple images due to the reflections of reflections.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. The triangular arrangement of mirrors infinitely bounces the reflections of the moving coloured pieces, resulting in ever-changing symmetrical patterns.
18
Assertion (A): Opaque objects form much lighter and fainter shadows compared to translucent objects.
Reason (R): Opaque objects completely block the light falling on them.
Reason (R): Opaque objects completely block the light falling on them.
Answer: (d)
A is false, but R is true. Because opaque objects completely block light, they form the darkest shadows. Translucent objects allow some light to pass, forming lighter shadows.
19
Assertion (A): A laser beam passed through a beaker of water mixed with a drop of milk will follow a distinctly curved path.
Reason (R): Light always travels in straight lines in a uniform transparent medium.
Reason (R): Light always travels in straight lines in a uniform transparent medium.
Answer: (d)
A is false, but R is true. The laser beam will follow a straight path through the water, clearly demonstrating the straight-line travel of light. It will not curve.
20
Assertion (A): LED lamps are highly promoted by the government as modern light sources instead of traditional incandescent bulbs.
Reason (R): LED lamps consume significantly less electrical power and have a much longer lifespan.
Reason (R): LED lamps consume significantly less electrical power and have a much longer lifespan.
Answer: (a)
Both A and R are true, and R is the correct explanation of A. The energy efficiency and longevity of LEDs make them environmentally friendly and cheaper to run, justifying the push to replace old bulbs.
❓ Frequently Asked Questions
What is covered in CBSE Class 7 Science Chapter 11 Light: Shadows and Reflections?
This chapter covers all key topics from Light: Shadows and Reflections as per CBSE 2026-27 syllabus.
Is this Assertion & Reason useful for CBSE board exams?
Yes, designed for CBSE Class 7 board exam preparation covering the complete syllabus.
Are these CBSE Class 7 Science Assertion & Reason updated for 2026-27?
Yes, all content at eBookPublisher is updated as per the latest 2026-27 CBSE syllabus.
How many chapters are in CBSE Class 7 Science?
All chapters of CBSE Class 7 Science are covered at eBookPublisher with free Assertion & Reason for each chapter.
Can I study Light: Shadows and Reflections online for free?
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