CBSE Class 6 Science Light Shadows and Reflections Assignment

Class-VI
L-11
Light, Shadows and Reflections

Question 1. Complete the following word ladder with the help of the clues given.
ACROSS
1. A body which has and emits light of its own.
3. A substance which does not allow light to pass throught.
5. A substance which allow light to pass throught it.
DOWN
2. This is formed when light is blocked by opaque object.
4. When moon comes between Sun and Earth.
Answer:
ACROSS:
1. LUMINOUS
3. OPAQUE
5. TRANSPARENT
DOWN:
2. SHADOW
4. ECLIPSE
In simple words: The crossword puzzle is solved using basic terms related to light, such as luminous objects, opaque and transparent materials, shadows, and eclipses.

Exam Tip: Always double-check letter counts and spelling when solving word ladders or crossword puzzles in science.

Question 2. MCQ Tick (✓) the correct option.
I Which fo these is a luminous object
(a) Car
(b) Chair
(c) Tree
(d) Burning Candle
Answer: (d) Burning Candle
A burning candle emits its own light, whereas a car, chair, and tree do not emit light of their own.
In simple words: Luminous objects produce their own light.

Exam Tip: Remember that objects like the Sun, stars, and burning candles are luminous, while most everyday objects are non-luminous.

Question 2. MCQ II A butter paper is an example of -
(a) Transparent
(b) Translucent
(c) Opaque
(d) Luminous
Answer: (b) Translucent
Butter paper allows only a part of light to pass through it, making it translucent.
In simple words: Materials that allow partial light to pass through are called translucent.

Exam Tip: Distinguish carefully between transparent (clear light), translucent (partial light), and opaque (no light).

Question 2. MCQ III Which of the following statement is correct -
(a) A shadow is caste by transparent object.
(b) Light does not get reflected from a mirror
(c) Light travels in a straight line.
(d) Light pass through opaque objects.
Answer: (c) Light travels in a straight line.
Light always travels in a straight line (rectilinear propagation), which is a fundamental property of light.
In simple words: Light moves in straight paths.

Exam Tip: The rectilinear propagation of light is the reason why shadows are formed behind opaque objects.

Question 3. Differentiate between the following.
a) Luminous and Non-luminous objects
Answer:
- Luminous objects: Objects that emit their own light (e.g., Sun, torch, glowing bulb).
- Non-luminous objects: Objects that do not emit their own light and are seen by the light reflected from them (e.g., moon, book, chair).
In simple words: Luminous objects make their own light; non-luminous objects do not.

Exam Tip: Give common examples for both categories to score full marks in differentiation questions.

Question 3. b) Image and shadow
Answer:
- Image: Formed by the reflection or refraction of light; it has the same color and details as the object.
- Shadow: Formed when an opaque object blocks the path of light; it is always dark and shows only the outline of the object, not its details or colors.
In simple words: An image shows details and color, while a shadow is just a dark outline.

Exam Tip: Remember that shadows give no color or internal details, whereas images do.

Question 4. What is following activity shows?
Answer:
The activity shows that light travels in a straight line (rectilinear propagation of light). When a comb is placed in the path of light from a torch, distinct bright lines or rays are seen on the screen, proving that light travels straight and does not bend around obstacles easily.
In simple words: This setup demonstrates that light rays travel in straight lines.

Exam Tip: Use keywords like "rectilinear propagation" and "straight line" when explaining light ray experiments.