Science Year 4 - Light worksheet - Free Printable

Problem Analysis:

The task requires filling in the blanks with appropriate words from the given list. The context is related to shadows, light, and their properties. The provided words are:

- shadow
- black
- distance
- Sun
- no shadow
- smaller
- bigger
- translucent

We need to use these words logically to complete the sentences.

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Solution:

#### 1. Shadow is formed when light is blocked by an opaque object.
- Reasoning: A shadow is created when light cannot pass through an opaque object, which blocks the light.

#### 2. The shadow of an object is always black in colour.
- Reasoning: Shadows appear black because they are areas where light is blocked, and there is no light to reflect back to our eyes.

#### 3. The clarity of shadow of an opaque object is clearer than translucent object.
- Reasoning: Opaque objects block all light, creating a sharp, clear shadow. Translucent objects allow some light to pass through, resulting in a less defined shadow.

#### 4. No shadow form on transparent object because light can pass through it.
- Reasoning: Transparent objects allow light to pass through completely, so no shadow is formed.

#### 5. The size of the shadow changes when the distance between the object and the light source changes.
- Reasoning: The size of a shadow depends on the distance between the object and the light source. As this distance changes, the shadow's size also changes.

#### 6. The more the distance between the object and the light source, the smaller the size of shadow.
- Reasoning: When the object is farther from the light source, the shadow becomes smaller because the light rays spread out more.

#### 7. The nearer the distance between the object and the light source, the bigger the size of shadow.
- Reasoning: When the object is closer to the light source, the shadow becomes larger because the light rays do not spread out as much.

#### 8. The change in the position of the Sun causes the changes in the length and position of the shadow tree.
- Reasoning: The position of the Sun affects the angle at which light hits the object, changing the length and direction of the shadow.

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Final Answer:

1. shadow
2. black
3. translucent
4. no shadow
5. distance
6. smaller
7. bigger
8. Sun

Boxed Answer:
\[
\boxed{
\text{shadow, black, translucent, no shadow, distance, smaller, bigger, Sun}
}
\]