Light Shadows and Reflections Class 7 MCQ
hardLight Shadows and Reflections Class 7 MCQ
Light Shadows and Reflections Class 7 MCQ
Question 1.
What type of image is formed by a plane mirror?
(a) Upside down (inverted)
(b) Lateral inversion
(c) Enlarged
(d) Reduced
Answer:
(b) Lateral inversion
Question 2.
At what time of the day is a person's shadow typically the shortest?
(a) 9 AM
(b) 12 PM
(c) 4 PM
(d) It is the same length all day
Answer:
(b) 12 PM
Question 3.
Which of the following statements is true regarding the image of the letter 'P' in a plane mirror?
(a) It appears identical to itself
(b) It is laterally inverted
(c) It appears upside down
(d) It cannot be seen in a mirror
Answer:
(b) It is laterally inverted
Question 4.
What happens to the size of a shadow when the light source is moved closer to the object?
(a) The shadow becomes larger
(b) The shadow becomes smaller
(c) The shadow disappears
(d) The shadow remains the same size
Answer:
(a) The shadow becomes larger
Question 5.
In a pinhole camera, what happens to the image when the object is moved further away?
(a) The image becomes larger
(b) The image becomes smaller
(c) The image becomes clearer
(d) The image disappears
Answer:
(b) The image becomes smaller
Question 6.
Which of the following materials is considered opaque?
(a) Glass
(b) Water
(c) Cardboard
(d) Tracing paper
Answer:
(c) Cardboard.
Case Study
I. Image Formation in a Pinhole Camera
When an object is moved further away from a pinhole camera, the image it forms becomes smaller. This happens because the light rays entering the tiny hole are more concentrated, leading to a reduced projection size. The principle behind a pinhole camera relies on the straight-line travel of light, allowing distant objects to appear smaller and inverted on the screen inside the camera.
Question 1.
What happens to the image in a pinhole camera when the object moves further away?
(a) It becomes brighter
(b) It becomes smaller
(c) It becomes larger
(d) It becomes clearer
Answer:
(b) It becomes smaller
Question 2.
Which principle does a pinhole camera rely on?
(a) Reflection of light
(b) Bending of light
(c) Light travels in a straight line
(d) Magnetic force
Answer:
(c) Light travels in a straight line
Question 3.
In a pinhole camera, the image becomes ............ when the object is moved further away.
Answer:
smaller
Question 4.
Light travels in a ............ line to form an image in a pinhole camera.
Answer:
straight
Question 5.
The image in a pinhole camera becomes larger when the object is moved further away. (True/False)
Answer:
False
II. The Fascinating World of Light and Shadows
Light travels in straight lines and can create shadows and reflections. When light passes through a small opening, such as in a pinhole camera, it forms an inverted image of the object. This phenomenon allows us to explore how light behaves and how it can be manipulated to create images. Understanding these concepts is essential for appreciating the science of optics and its applications in everyday life.
Question 1.
What happens to the image of an object when viewed through a pinhole camera?
Answer:
The image appears upside down.
Question 2.
Why do we see our reflection in a plane mirror?
Answer:
A plane mirror reflects light in a way that allows us to see the image of ourselves, which is laterally inverted.
Question 3.
What is the difference between the images formed by a pinhole camera and a plane mirror?
Answer:
A pinhole camera produces an inverted image, while a plane mirror creates a laterally inverted image that is not upside down. This distinction arises from the way light rays travel and reflect off surfaces.