Explore the concepts of light, sound, and shadows through definitions, fill-in-the-blanks, true/false questions, and answers. Learn about luminous objects, noise pollution, shadow formation, and ways to reduce noise pollution. Understand the differences between transparent and translucent objects. Discover how sound is produced and what shadows are.
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Fill in the blanks- a) Objects such as bed and bag that do not emit light are called non- luminious object. b) Translucent objects allow some light to pass through them. c) Transparent objects allow light to pass through them completely. d) Light travels in a straight line.
Write T for true and F for false- a) A shadow may differ in size and shape. (T) b) Soft and pleasant sounds are called noise.(F) c) Opaque object allow light to pass through them.(F) d) Shadow formed by the sun are longest during afternoon.(F) e) When an object blocks light, the dark shape is formed on a surface by the object coming between the light and the surface. (T)
Define the following a) Cling film- A thin transparent plastic film usually used for wrapping food. b) Luminous object- The objects that give us light are known as luminous object. c) Noise Pollution- Loud and unpleasant sounds hurt our ears. These unpleasant and harmful noises result noise pollution.
Answer the following questions- Q1- How is sound produced? Ans- Sound is produced by an vibrating object. Vibrations are produced when we speak, laugh and clap. Q2-What is shadow? Ans- When an object blocks light, a dark shape is formed . This dark shape is called shadow.
Q3-Write any two ways to reduce noise pollution. Ans- (i) Do not play loud music. (ii) Do not set off loud firecrackers. Q4- Difference between transparent and translucent object- Transparent object Translucent object a) It allows light to pass through them completely. b) E.g- cling film, clear glass. a) It allows some light to pass through them. b) E.g- dirty water, coloured glass .
