Class 7 Exam > Class 7 Notes > Science (Curiosity) Class 7 - New NCERT > Unit Test: Light: Shadows and Reflection
Unit Test: Light: Shadows and Reflection | Science (Curiosity) Class 7 - New NCERT PDF Download
Time: 1 Hour
Maximum Marks: 30
Instructions:
Attempt all questions.
Question numbers 1 to 5 carry 1 mark each .
Question numbers 6 to 8 carry 2 marks each.
Question numbers 9 to 11 carry 3 marks each.
Question numbers 12 and 13 carry 5 marks each.
Q1. Which object shines by reflecting light rather than producing it? (1 Mark)
a) Sun
b) Firefly
c) Moon
d) Lightning
Q2. What happens when light passes through a translucent material? (1 Mark)
a) It is completely blocked
b) It passes through clearly
c) It passes through partially, causing blurred visibility
d) It reflects back completely
Q3. What is the term for the left-right reversal in a plane mirror image? (1 Mark)
a) Rectilinear propagation
b) Shadow formation
c) Lateral inversion
d) Reflection
Q4. Which device uses two mirrors to see objects not directly visible? (1 Mark)
a) Pinhole camera
b) Periscope
c) Kaleidoscope
d) Torch
Q5. Which material produces the darkest shadow? (1 Mark)
a) Glass
b) Tracing paper
c) Cardboard
d) Clear plastic
Q6. Give two differences between luminous and non-luminous objects. (2 Mark)
Q7. Why is "AMBULANCE" written in reverse on the front of vehicles? (2 Mark)
Q8. What makes LED lamps environmentally friendly? (2 Mark)
Q9. What are the characteristics of an image formed in a plane mirror? (3 Mark)
Q10 What is a periscope, and mention its practical uses. (3 Mark)
Q11. How do you form a shadow using a torch? (3 Mark)
Q12: Describe the process of shadow formation. (5 Mark)
Q13: Explain how the Moon reflects light. (5 Mark)
You can find the solutions of this Unit Test here: Unit Test Solutions: Light: Shadows and Reflection
The document Unit Test: Light: Shadows and Reflection | Science (Curiosity) Class 7 - New NCERT is a part of the Class 7 Course Science (Curiosity) Class 7 - New NCERT.
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FAQs on Unit Test: Light: Shadows and Reflection - Science (Curiosity) Class 7 - New NCERT
| 1. What are shadows and how are they formed? |  |
Ans. Shadows are dark areas or shapes produced when an object blocks light from a light source. When light travels in straight lines, it is obstructed by opaque objects, creating a shadow on the surface behind the object. The size and shape of a shadow depend on the position of the light source and the object blocking the light.
| 2. What factors affect the size and shape of a shadow? | |
Ans. The size and shape of a shadow are influenced by several factors, including the distance between the light source and the object, the distance between the object and the surface where the shadow falls, and the angle at which the light hits the object. For instance, when the light source is close to the object, the shadow appears larger and more distorted.
| 3. How does reflection of light work? | |
Ans. Reflection of light occurs when light rays strike a surface and bounce back. This phenomenon is governed by the law of reflection, which states that the angle of incidence (the angle at which incoming light hits a surface) is equal to the angle of reflection (the angle at which light reflects off the surface). Smooth surfaces like mirrors reflect light well, while rough surfaces scatter light.
| 4. Can you explain the difference between regular and diffuse reflection? | |
Ans. Regular reflection occurs on smooth surfaces, like mirrors, where light rays reflect at equal angles, producing a clear image. In contrast, diffuse reflection happens on rough surfaces, where light rays scatter in various directions, resulting in a blurred or indistinct image. This is why we can see objects that are not shiny, as they reflect light diffusely.
| 5. What is the importance of shadows and reflections in everyday life? | |
Ans. Shadows and reflections play vital roles in our daily experiences. Shadows help in understanding the position of light sources and can indicate the time of day. Reflections enable us to see ourselves in mirrors and help in navigation, as they can indicate the presence of water or other reflective surfaces. Additionally, shadows and reflections are important in art and photography, adding depth and perspective to visual compositions.
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