Light Shadows and Reflections Class 7 Fill in the Blanks
hardLight Shadows and Reflections Class 7 Fill in the Blanks
Light Shadows and Reflections Class 7 Fill in the Blanks
Question 1.
The image formed by a plane mirror is always .............
Answer:
laterally inverted
Question 2.
A shadow is formed when an opaque object blocks the ............ of light.
Answer:
path
Question 3.
The ............ of a shadow depends on the position of the light source.
Answer:
size
Question 4.
In a pinhole camera, the image is formed on a ............ screen.
Answer:
translucent
Question 5.
The phenomenon changing the direction of light, when it hits a shiny surface is called .............
Answer:
reflection
Light Shadows and Reflections Class 7 True or False
Question 1.
The shadow of a tall building will always be longer than the shadow of a small tree.
Answer:
False (The length of the shadow depends on the position of the sun)
Question 2.
A periscope uses two mirrors to allow a person to see around corners.
Answer:
True
Question 3.
Light travels in curved lines.
Answer:
False (Light travels in straight lines)
Question 4.
The image of a candle flame seen through a pinhole camera is upright.
Answer:
False (The image is inverted)
Question 5.
When an opaque object is placed in front of a light source, it will always cast a shadow.
Answer:
True
Light Shadows and Reflections Class 7 Match the Following
Question 1.
| Column A | Column B |
| (a) Pinhole camera | (i) The dark region formed behind the object |
| (b) Opaque object | (ii) Blocks light completely |
| (c) Transparent object | (iii) Light passes almost completely through it |
| (d) Shadow | (iv) Forms an inverted image |
Answer:
| Column A | Column B |
| (a) Pinhole camera | (i) The dark region formed behind the object |
| (b) Opaque object | (ii) Blocks light completely |
| (c) Transparent object | (iii) Light passes almost completely through it |
| (d) Shadow | (iv) Forms an inverted image |
Question 2.
| Column A (Position of the torch) | Column B (Characteristics of the ball's shadow) |
| (a) If the torch is close to the ball | (i) The shadow would be smaller |
| (b) If the torch is far away | (ii) The shadow would be larger |
| (c) If the ball is removed from the set-up | (iii) Two shadows would appear on the screen |
| (d) If two torches are present in the set-up on the left side of the ball | (iv) A bright spot would appear on the screen |
Answer:
| Column A (Position of the torch) | Column B (Characteristics of the ball's shadow) |
| (a) If the torch is close to the ball | (ii) The shadow would be larger |
| (b) If the torch is far away | (i) The shadow would be smaller |
| (c) If the ball is removed from the set-up | (iv) A bright spot would appear on the screen |
| (d) If two torches are present in the set-up on the left side of the ball | (iii) Two shadows would appear on the screen |