Light: Shadows and Reflections
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Sources of Light
SubtopicSources of Light under Light: Shadows and Reflections for Grade 7 CBSE.
Preview questions (no answers)
- 1.
A dark room has no light. If you put a mirror in it, will it glow?
A.Yes, because it is shiny
B.No, because it is non-luminous
C.Yes, if it is made of silver
D.No, because it absorbs all light
- 2.
Which of these is NOT a luminous object?
A.Glowing heater element
B.Sparkling diamond
C.The Sun
D.Flash of lightning
- 3.
The tail of a firefly glows. This light is an example of:
A.Incandescence
B.Bioluminescence
C.Reflection
D.Fluorescence
- 4.
Which type of light source is an LED?
A.Natural
B.Artificial
C.Non-luminous
D.None of these
- 5.
A student classifies the following four items into a single group based on a shared characteristic. What is the most scientifically accurate heading for this 'Group X'?
A.Natural Sources of Light
B.Artificial Sources of Light
C.Luminous Objects
D.Non-luminous Objects
- 6.
Study the diagram representing the interaction of light between the Sun, the Moon, and the Earth. Which of these objects can be strictly classified as a 'luminous source' of light in this system?
A.Both the Sun and the Moon
B.Only the Sun
C.The Sun, the Moon, and the Earth
D.Only the Moon
- 7.
If you are standing in a dark room and want to see a chair, where should you point the light from your torch?
A.At your own eyes
B.At the chair
C.At the ceiling
D.At the floor behind you
- 8.
Which of the following will NOT form a shadow?
A.A bird flying in the sky (on a very distant ground)
B.A clear glass of pure water in a dark room with a single beam of light
C.A piece of wood
D.A human being
- 9.
In which of the following media does light travel the fastest?
A.Water
B.Glass
C.Vacuum
D.Air
- 10.
The moon is a non-luminous body. However, it appears bright in the sky. This is because:
A.It has its own light like the sun
B.It reflects sunlight towards the Earth
C.It is made of glowing gases
D.It absorbs light and emits it later
Download the worksheet for Light: Shadows and Reflections - Sources of Light to practice offline. It includes additional chapter-level practice questions.
Does Light Travel in a Straight Line?
SubtopicDoes Light Travel in a Straight Line? under Light: Shadows and Reflections for Grade 7 CBSE.
Preview questions (no answers)
- 1.
If you put a piece of cardboard in front of a torch, what happens to the light?
A.It passes through
B.It is blocked and a shadow is formed
C.It turns into a different color
D.It bends around the cardboard
- 2.
The path of light is represented by a straight line with an arrow called a:
A.Beam
B.Ray
C.Vector
D.Shadow
- 3.
Which property of light is used by a periscope?
A.Refraction
B.Reflection
C.Absorption
D.Inversion
- 4.
Which of these is a non-luminous body?
A.A glowing bulb
B.A burning candle
C.A table
D.A firefly
- 5.
Which of the following travels faster than light?
A.Sound
B.A jet plane
C.Nothing (in vacuum)
D.Electricity
- 6.
In the phrase 'Rectilinear propagation of light', what does 'rectilinear' mean?
A.Moving in a circle
B.Moving in a straight line
C.Moving back and forth
D.Spreading in all directions
- 7.
Shadows are formed because light ________ pass through opaque objects.
A.can easily
B.cannot
C.partially
D.sometimes
- 8.
Which of the following is the most scientifically accurate reason for why we use a 'pinhole' instead of a large hole in a pinhole camera?
A.To let in as much light as possible.
B.To ensure that only one light ray from each point on the object reaches a specific point on the screen.
C.To flip the image upside down.
D.To filter out the different colors of light.
- 9.
If you are looking at your reflection in a steady pool of water, and a stone is thrown in making ripples, the image becomes distorted. Why?
A.The water becomes opaque.
B.The straight-line path of light is broken by the water movement.
C.The surface is no longer flat, so light reflects in many different straight-line directions.
D.Light starts traveling in curves due to the ripples.
- 10.
An object is placed between two parallel plane mirrors facing each other. How many images will be formed, and why?
A.One image, because light travels in a straight line.
B.Two images, one in each mirror.
C.Infinite images, because light reflects back and forth between the mirrors in straight lines.
D.No images, because the mirrors block each other.
Download the worksheet for Light: Shadows and Reflections - Does Light Travel in a Straight Line? to practice offline. It includes additional chapter-level practice questions.
Light through Transparent, Translucent, and Opaque Materials
SubtopicLight through Transparent, Translucent, and Opaque Materials under Light: Shadows and Reflections for Grade 7 CBSE.
Preview questions (no answers)
- 1.
Which of these gives us a clear reflection?
A.Wall
B.Mirror
C.Paper
D.Cloth
- 2.
The image in a pinhole camera is small if the screen is ______ to the pinhole.
A.Closer
B.Farther
C.Very far
D.Parallel
- 3.
What is formed when the path of light is blocked by an object?
A.Reflection
B.Image
C.Shadow
D.Beam
- 4.
Can we see a shadow in a completely dark room?
A.Yes
B.No
C.Only if the object is white
D.Only if the object is large
- 5.
Analyze the behavior of a light beam as it hits three different unknown materials: P, Q, and R. Based on the flowchart, which set of classifications for these materials is correct?
A.P: Opaque; Q: Translucent; R: Transparent
B.P: Transparent; Q: Opaque; R: Translucent
C.P: Translucent; Q: Opaque; R: Transparent
D.P: Transparent; Q: Translucent; R: Opaque
- 6.
In the experimental setup shown below, a beam of light from a torch passes through Layer 1 (Air) and then through an unknown material at Layer 2. The light reaching the final stage is scattered and faint. What material is most likely placed at Layer 2?
A.A sheet of waxed paper
B.A clear glass plate
C.A thick wooden board
D.A steel sheet
- 7.
A student is testing materials to make a lampshade. A lampshade needs to allow light to glow through it but should hide the bright light bulb from clear view. Based on the interaction of light shown in the diagram, which sample should the student select?
A.Sample A
B.Sample B
C.Sample C
D.None of the samples
- 8.
Which of the following is a non-luminous object that can still allow light to pass through it?
A.Sun
B.Burning candle
C.Pure water
D.Glowing worm
- 9.
A piece of glass is 'frosted' by scratching its surface. This process turns the glass from:
A.Translucent to Transparent
B.Transparent to Translucent
C.Transparent to Opaque
D.Opaque to Translucent
- 10.
If you place an opaque object very close to a screen and a light source very far away, the shadow will be:
A.Almost the same size as the object.
B.Many times larger than the object.
C.Blurry and unrecognizable.
D.Non-existent.
Download the worksheet for Light: Shadows and Reflections - Light through Transparent, Translucent, and Opaque Materials to practice offline. It includes additional chapter-level practice questions.
Shadow Formation
SubtopicShadow Formation under Light: Shadows and Reflections for Grade 7 CBSE.
Preview questions (no answers)
- 1.
What kind of object is a butter paper?
A.Transparent
B.Opaque
C.Translucent
D.Luminous
- 2.
If you want to make the shadow of an object smaller, you should:
A.Move the object closer to the source
B.Move the object further from the source
C.Turn off the light
D.Use a larger light source
- 3.
Which of these is NOT a source of light?
A.A star
B.A firefly
C.A mirror
D.A torch
- 4.
Shadow formation proves that light travels in ________.
A.Curves
B.Straight lines
C.Circles
D.Waves
- 5.
Which of these will produce the sharpest shadow?
A.An object in front of a large tube light.
B.An object in front of a small point-sized LED.
C.An object in front of a frosted bulb.
D.An object in a room with many windows.
- 6.
If you hold a book between a bulb and a wall, and then move the book towards the wall, what happens?
A.The shadow gets larger.
B.The shadow gets smaller.
C.The shadow stays the same.
D.The shadow disappears.
- 7.
The size of a shadow depends on the relative distance between:
A.Source and object
B.Object and screen
C.Source and screen
D.All of the above
- 8.
In a pinhole camera, if the distance between the pinhole and the screen is increased, the image formed is:
A.Smaller
B.Larger
C.Brighter
D.The same size
- 9.
If you use a triangular light source, what would be the shape of the penumbra of a circular object?
A.Circular
B.Triangular
C.A complex shape influenced by both the triangle and the circle
D.Square
- 10.
How does the shape of a shadow change if the orientation of the screen is changed from perpendicular to tilted relative to the light rays?
A.The shadow disappears.
B.The shadow becomes elongated and distorted.
C.The shadow becomes smaller and sharper.
D.The shape does not change.
Download the worksheet for Light: Shadows and Reflections - Shadow Formation to practice offline. It includes additional chapter-level practice questions.
Reflection of Light
SubtopicReflection of Light under Light: Shadows and Reflections for Grade 7 CBSE.
Preview questions (no answers)
- 1.
In a plane mirror, the right hand appears as the:
A.Right hand
B.Left hand
C.Foot
D.Head
- 2.
A shadow is always ________.
A.Colored
B.White
C.Dark
D.Transparent
- 3.
Which of the following does NOT emit light?
A.Stars
B.Metals
C.Burning candle
D.Glow-worm
- 4.
The image formed by a pinhole camera is ________ in size compared to the object.
A.Always larger
B.Always smaller
C.Always the same
D.Larger or smaller depending on distance
- 5.
A ray of light strikes a plane mirror at an angle of to its surface (along the normal), as shown in the diagram. Which path correctly represents the direction of the reflected ray?
A.Path 1
B.Path 3
C.Path 2
D.Path 4
- 6.
Which part of the eye is similar to the 'screen' in a camera where an image is formed?
A.Pupil
B.Retina
C.Iris
D.Lens
- 7.
If the image formed by a mirror is always erect and the same size as the object, the mirror is:
A.Concave
B.Convex
C.Plane
D.Cylindrical
- 8.
Why is the image in a plane mirror always 'erect'?
A.Because light travels in straight lines
B.Because the rays of light actually meet at a point
C.Because it is a property of the virtual image formed by a plane mirror
D.Because the mirror is vertical
- 9.
When looking at a mirror, you see an image of yourself. Where is this image located?
A.On the surface of the mirror
B.In front of the mirror
C.Behind the mirror at the same distance as you are in front
D.In your eyes
- 10.
What is the angle of reflection for a ray of light that strikes the mirror at an angle of to the normal?
A.B.C.D.
Download the worksheet for Light: Shadows and Reflections - Reflection of Light to practice offline. It includes additional chapter-level practice questions.
Images Formed in a Plane Mirror
SubtopicImages Formed in a Plane Mirror under Light: Shadows and Reflections for Grade 7 CBSE.
Preview questions (no answers)
- 1.
If you move away from a plane mirror, the size of your image:
A.Increases
B.Decreases
C.Remains the same
D.Becomes zero
- 2.
Which of these is NOT required to see a reflection in a mirror?
A.A source of light
B.The mirror
C.An object
D.A dark room
- 3.
What happens when light strikes a transparent object?
A.It is blocked
B.It passes through almost completely
C.It is reflected back
D.It turns into a shadow
- 4.
Light comes from a ___________.
A.Shadow
B.Reflector
C.Source
D.Darkness
- 5.
A ray of light strikes a plane mirror as shown in the diagram. If the angle of incidence is increased from to (doubling the angle), what will happen to the angle of reflection?
A.The angle of reflection will also double.
B.The angle of reflection will remain .
C.The angle of reflection will become half ().
D.The angle of reflection will become .
- 6.
A pencil long is held vertically with its base resting on a plane mirror that is placed horizontally on a table. Which of the following is true about the image of the pencil?
A.The image is long and appears upright.
B.The image is long and appears upright.
C.The image is long and appears upside down relative to the pencil.
D.The image is long and appears laterally inverted only.
- 7.
When we see the image of a non-luminous object, like a book, in a plane mirror, which sequence correctly represents the path taken by light rays?
A.Eye Mirror Book Light Source
B.Light Source Book Mirror Eye
C.Mirror Light Source Book Eye
D.Light Source Mirror Book Eye
- 8.
A clock is placed in front of a plane mirror. The time in the mirror is 5:45. What is the real time?
A.6:15
B.5:15
C.6:45
D.7:15
- 9.
A ray is incident on a plane mirror at to the mirror surface. The angle between the incident ray and the reflected ray is:
A.B.C.D. - 10.
In a plane mirror, the image's left appears to be the object's right. This is called:
A.Vertical inversion
B.Refraction
C.Lateral inversion
D.Reflection
Download the worksheet for Light: Shadows and Reflections - Images Formed in a Plane Mirror to practice offline. It includes additional chapter-level practice questions.
Pinhole Camera
SubtopicPinhole Camera under Light: Shadows and Reflections for Grade 7 CBSE.
Preview questions (no answers)
- 1.
The image in a pinhole camera is real because:
A.It can be obtained on a screen
B.It is inverted
C.It is colored
D.It is small
- 2.
Which of the following is true for a pinhole camera?
A.The image is always smaller than the object
B.The image is always larger than the object
C.The image can be smaller, larger, or same size depending on distances
D.The image is always blurred
- 3.
To make a pinhole camera, we need two boxes of _______ size.
A.Exactly the same
B.Slightly different
C.Very large
D.Spherical
- 4.
What is the primary reason why we cannot see through a bendy tube?
A.Light travels in straight lines
B.Light is absorbed by the tube
C.The tube is too long
D.Light travels too fast
- 5.
A student sets up a pinhole camera to view two separate glowing LED bulbs: a red bulb placed directly above a green bulb. Which of the following observations will the student most likely make on the camera's screen?
A.A single blurred spot that is a mixture of red and green light
B.A red image on the top and a green image on the bottom
C.A green image on the top and a red image on the bottom
D.No image will be formed because the rays from different bulbs will collide and block each other at the pinhole
- 6.
In the construction of a pinhole camera, the 'box within a box' design allows us to:
A.Change the size of the pinhole
B.Adjust the distance between the pinhole and the screen
C.Block more light
D.Make the camera more durable
- 7.
If you look at a letter 'L' through a pinhole camera, how will it appear on the screen?
A.As 'L'
B.Upside down and swapped left-to-right
C.Only left-to-right swapped
D.Only upside down
- 8.
Comparing a pinhole camera image with a mirror reflection, which statement is correct?
A.The pinhole image is virtual, the mirror reflection is real.
B.The pinhole image is real, the mirror reflection is virtual.
C.Both are real.
D.Both are virtual.
- 9.
If you use a pinhole camera to view a long fluorescent tube light placed vertically, the image on the screen will be:
A.A vertical tube.
B.A horizontal tube.
C.A circular point.
D.A blurred square.
- 10.
In a pinhole camera, if the object is at infinity (like a star), the image is formed:
A.At the pinhole.
B.On the screen, regardless of the screen's distance from the hole.
C.Only if the screen is at a specific focal distance.
D.Behind the screen.
Download the worksheet for Light: Shadows and Reflections - Pinhole Camera to practice offline. It includes additional chapter-level practice questions.
Making Some Useful Items
SubtopicMaking Some Useful Items under Light: Shadows and Reflections for Grade 7 CBSE.
Preview questions (no answers)
- 1.
When light travels from one point to another, it follows a:
A.Curved path
B.Shortest straight path
C.Random path
D.Zigzag path
- 2.
Which of these is an example of an opaque object?
A.Water
B.Air
C.Cardboard
D.Cellophane paper
- 3.
In a pinhole camera, the distance between the pinhole and the screen determines the ________ of the image.
A.Color
B.Brightness
C.Size
D.Shape
- 4.
Which of the following does not change during the reflection of light from a plane mirror?
A.Direction of light
B.The color of the light
C.The path of light
D.The angle of light
- 5.
If you use a rectangular hole instead of a pinhole in a camera, what will be the shape of the image of a circular light bulb?
A.Circular
B.Rectangular
C.Blurred with no definite shape
D.Triangular
- 6.
During a clear day, the shadow of a pole is shortest at:
A.Sunrise
B.Noon
C.Sunset
D.Midnight
- 7.
A shadow does not show any ______ of the object.
A.Shape
B.Size
C.Details or color
D.Outline
- 8.
In a pinhole camera, if the screen is replaced by a high-quality magnifying lens, the device effectively becomes:
A.A telescope
B.A standard camera
C.A periscope
D.A microscope
- 9.
If you rotate your head to the left while looking in a plane mirror, in which direction does the 'head' of your image appear to rotate from your perspective?
A.Left
B.Right
C.Up
D.Down
- 10.
A student uses a convex mirror instead of a plane mirror in a periscope. What would be the most likely result?
A.The field of view would increase, but the image would be diminished
B.The image would be larger and sharper
C.The image would be inverted
D.The light would not reach the second mirror
Download the worksheet for Light: Shadows and Reflections - Making Some Useful Items to practice offline. It includes additional chapter-level practice questions.
Periscope
SubtopicPeriscope under Light: Shadows and Reflections for Grade 7 CBSE.
Preview questions (no answers)
- 1.
Which of the following is NOT a component of a simple periscope?
A.Mirror 1
B.Mirror 2
C.A tube
D.A battery
- 2.
Why is the periscope used in armored tanks?
A.To see the wheels
B.To see outside while remaining protected inside
C.To look at the engine
D.To communicate with other tanks
- 3.
Reflection from a smooth surface like a plane mirror is called:
A.Diffused reflection
B.Regular reflection
C.Irregular reflection
D.Opaque reflection
- 4.
If the angle of the mirrors is changed to to the light path, what happens?
A.The light will reflect straight back to the source
B.The light will go down the tube
C.The light will turn
D.The image will be much larger
- 5.
Why can't we use a single mirror to see over a wall effectively like a periscope?
A.Because one mirror doesn't reflect light
B.Because the image would be at the top of the wall, out of view
C.Because one mirror cannot reflect light at
D.Because one mirror would make the image real
- 6.
If the periscope is submerged in water but the top opening is above water, how does the light behave at the mirrors?
A.It reflects as usual
B.It stops reflecting
C.It changes color
D.It bends twice as much
- 7.
A periscope is an application of:
A.Multiple reflection
B.Diffuse reflection
C.Total absorption
D.Refraction by lenses
- 8.
A student wants to build a periscope to see over a m wall. If they use a m tube, where should the mirrors be placed for maximum visibility?
A.At the very top and very bottom ends of the tube
B.In the middle of the tube
C.Both at the bottom
D.m from each end
- 9.
In a periscope, the ray between the two mirrors is to the incident ray. What is the angle of incidence on the second mirror?
A.B.C.D. - 10.
If a periscope mirror is slightly curved (convex), how will the image be affected?
A.It will be larger
B.It will be smaller and cover a wider field of view
C.It will be clearer
D.It will be inverted
Download the worksheet for Light: Shadows and Reflections - Periscope to practice offline. It includes additional chapter-level practice questions.
Kaleidoscope
SubtopicKaleidoscope under Light: Shadows and Reflections for Grade 7 CBSE.
Preview questions (no answers)
- 1.
If you look through a kaleidoscope in a pitch-dark room, what will you see?
A.Bright patterns
B.Faint patterns
C.Nothing/Darkness
D.White light
- 2.
In a kaleidoscope, the colored pieces are placed ______.
A.Between the eye and the hole
B.Between two glass plates at one end
C.Outside the tube
D.On the mirror surface
- 3.
The images in a kaleidoscope are ______.
A.Real images
B.Virtual images
C.Shadows
D.Inverted vertically
- 4.
To make a kaleidoscope, the mirrors should be placed with their ______.
A.Reflecting surfaces facing each other
B.Reflecting surfaces facing outwards
C.Painted surfaces facing each other
D.Edges not touching
- 5.
When we place two plane mirrors parallel to each other, how many images are formed?
A.One
B.Two
C.Infinite
D.Zero
- 6.
A mirror's surface is smooth and polished so that it can undergo:
A.Diffuse reflection
B.Regular reflection
C.Total absorption
D.Dispersion
- 7.
Why is it difficult to see the same pattern twice in a kaleidoscope?
A.Because the mirrors move
B.Because the light source changes color
C.Because of the random tumble of colored pieces each time it is shaken or rotated
D.Because the eyehole changes size
- 8.
Why does a kaleidoscope create 'symmetrical' patterns?
A.Because the objects are symmetrical
B.Because the multiple reflections are arranged at regular angular intervals
C.Because the tube is a cylinder
D.Because of the way our brain interprets light
- 9.
If the angle between mirrors is , how many images are formed?
A.4
B.5
C.6
D.3
- 10.
When building a kaleidoscope, why do we use a circular tube for the body?
A.To allow the mirrors to rotate inside
B.It is the easiest shape to hold and rotate while maintaining the alignment of the triangular mirror insert
C.To make the images circular
D.To prevent light from entering through the sides
Download the worksheet for Light: Shadows and Reflections - Kaleidoscope to practice offline. It includes additional chapter-level practice questions.