DAV Class 6 Science Solution Chapter 12 Light and Shadows
DAV School Books Class 6 Science Solution Chapter 12 Light and Shadows all Question Answer. DAV Class 6 12th Chapter Light and Shadows full Chapter explanation by expert teacher.
DAV School Books Class 6 Science Solution Chapter 12 Light and Shadows:
(A) Fill in the blanks.
Answer: (1) Transparent.
Answer: (2) Opaque.
Answer: (3) Black.
Answer: (4) Lunar eclipse.
Answer: (5) direction.
(B) Match the following statements.
Answer:
1.) Natural source of light: (e) sun, stars and firefly.
2.) CFL, LED and tubelight: (d) man-made source of light.
3.) Rectilinear propagation of light: (a) light moves along a straight path.
4.) Eclipse: (c) shadow cast by a heavenly body.
5.) Interchange of the ‘left’ and ‘right’ sides in the image: (b) lateral inversion.
(C) Tick (✓) the correct option.
(1) Objects, like the sun, which emit light of their own, are called ____.
Answer: (a) Luminous objects.
(2) An object, through which we can see partially, but not very clearly, is ______.
Answer: (b) a sheet of tracing paper.
(3) The ‘something’, which can change its shape and size, and may appear and disappear anywhere/anytime, is known as a ______.
Answer: (b) Shadow.
(4) When the sun (during early morning) is behind an object, the size of its shadow in comparison to that of the object would be _______.
Answer: (c) Larger.
(5) The image, formed by a pinhole camera, is _____.
Answer: (c.) inverted and diminished
(D) Answer the following questions in brief.
(1) Classify the materials given below as opaque, transparent or translucent.
air, smoke, fog, aluminium sheet, wooden board, cellotape, polythene sheet, lime juice, wax, rubber, tyre and milk
Answer:
- Opaque materials – aluminium sheet, wooden board, rubber, tire and milk
- Transparent material – air, cello tape, polythene sheet, lemon juice
- Translucent material – smoke, fog, wax.
2.) State the type of path that light ordinarily follows when going from one point to another?
Answer: Light ordinarily follows the straight line path when going from one point to another point.
3.) Do fishes cast shadows in water?
Answer: The body of a fish is a pick hence the fishes cast shadows in water.
4.) On a sunny day, two identical bedsheets, of red and green colour, are hanging on a clothes line. What would be the colour of the shadows of these two bed sheets?
Answer: The colour of the object does not affect the shadow of the object. the shadow will always form black in colour.
5.) State the relative positions, of the sun, moon and the earth, during a lunar eclipse.
Answer:- At the time of lunar eclipse the earth comes in between the sun and the moon in a straight line.
(E) Answer the following questions.
(1) Cover the face of a torch with a transparent coloured paper. Send its beam through an opaque object. What do you observe?
Answer: As we all know that the colour of an object does not affect the shadow of an object. In the same way the colour of light does not affect the shadow of object. The shadow is always black in color, which we can observe when we cover the face of a torch with a transparent colour paper and send its beam through an opaque object.
(5) Give the meaning of the term ‘Lateral inversion’. Suggest how it may be used to send a ‘coded (secret)’ message.
Answer:- When we stand in front of a plane mirror they appear in the interchange of left and right sides of the image.
The left side appears right and the right side appears left; this property is called lateral inversion.
This type of letter inversion is generally used for the AMBULANCE
The word AMBULANCE is written in the lateral inversion from the driver of a car going ahead of this vehicle sees it as an AMBULANCE and therefore gives the right way to such vehicles.
Value based questions
Q.) When Sumiti got admission to her new school, her class teacher advised her to follow the example of her cousin sister, Karmatha, a senior student in the same school. The teacher told her that Karmatha had, all along, been a hard working, sincere, regular, well behaved and disciplined student. She also told her that Karmatha’s nature was unlike that of the shadow of an object. This was because the shadow often changes its size and appearance, with a change in the source of light to which it was due.
(1) Which, according to you, are the two values, displayed by Karmatha, that Sumiti must follow?
Answer: Being a hard working, sincere, regular, well behaved and disciplined student are values displayed by Karmatha, that Sumiti must follow.
(2) Does the size of the shadow, of a given object, change even when there is no change in the source of light? Give one example in support of your answer.
Answer: No. There will be no change in the size of shadow. Take the example of sun, same source of light but shadow of object changes by positions of sun i.e. in morning the shadow will appear larger as well in afternoon the shadow will appear smaller.
Something To Do
(3) Transparent objects can also cause shadows. Think it over. Identify such cases, and the conditions, for shadow formation.
Answer:- No transparent objects do not cause shadows because they let light pass through them. Hence, they don’t form any dark patches.
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