All questions of See Objects for Grade 1 Exam

Understanding Light Transmission
Light is a form of energy that travels in waves and can pass through certain materials. The ability of an object to let light pass through it is determined by its transparency.
Types of Materials
- Transparent Materials: These materials allow light to pass through them easily. Examples include clear glass and water.
- Translucent Materials: These materials let some light pass through but scatter it, resulting in a blurred image. Examples include frosted glass and thin plastic.
- Opaque Materials: These materials do not allow light to pass through at all. Examples include wood, metal, and solid plastic.
Analysis of the Options
- A Wooden Block:
- Opaque
- Does not allow light to pass through.
- A Glass Window:
- Transparent
- Allows light to pass through easily, making it the correct answer.
- A Metal Spoon:
- Opaque
- Does not allow light to pass through.
- A Plastic Toy:
- Usually opaque, depending on thickness
- Typically does not allow light to pass through.
Conclusion
The correct answer is option 'B' (A glass window) because it is a transparent material that allows light to pass through without obstruction. Understanding these properties helps us learn how different materials interact with light in our everyday lives.

When an object is moved closer to the light source, the shadow gets smaller.

Explanation:
When an object blocks the path of light, it creates a shadow behind it. The size of the shadow depends on the distance between the object and the light source. Let's understand why the shadow gets smaller when the object is moved closer to the light source:

1. Nature of Light:
Light travels in straight lines. When light rays encounter an object, they cannot pass through it and create an area of darkness behind it, known as a shadow. The size and shape of the shadow are determined by the position of the object and the direction of the light source.

2. Proportional Relationship:
The size of a shadow is directly related to the distance between the object and the light source. As the object is moved closer to the light source, the distance between the object and the light source decreases. This change in distance affects the size of the shadow.

3. Light Spreading Out:
When light rays are emitted from a single point source, they spread out in all directions. As the light rays diverge or spread out, they cover a larger area. So, when the object is closer to the light source, the light rays diverge less, resulting in a smaller area of shadow being created.

4. Angle of Light:
The angle at which the light rays hit the object also affects the size of the shadow. When the object is closer to the light source, the angle of the light rays hitting the object becomes steeper. This causes the shadow to be shorter and smaller compared to when the object is farther away.

5. Conclusion:
In conclusion, when the object is moved closer to the light source, the shadow gets smaller because the distance between the object and the light source decreases. The light rays diverge less, and the angle of incidence becomes steeper, resulting in a smaller shadow being cast.

Explanation:

Introduction:
Shadows are formed when an object blocks light from a source, creating a dark area behind it. In order for an object to create a shadow, it needs to be opaque or partially opaque, allowing it to block the light.

Analysis:
Let's analyze the given objects and determine whether they can create a shadow or not.

a) A ball of yarn:
A ball of yarn is soft and made up of threads. It is not an opaque object, and light can easily pass through its gaps. Therefore, a ball of yarn cannot make a shadow.

b) A rubber duck:
A rubber duck is a solid object and is partially opaque. It does not allow light to pass through it completely. Therefore, a rubber duck can make a shadow.

c) A fluffy pillow:
A fluffy pillow is soft and made up of fabric. It is not an opaque object, and light can easily pass through its fluffy surface. Therefore, a fluffy pillow cannot make a shadow.

d) A cardboard cutout:
A cardboard cutout is a solid object and is opaque. It blocks light from passing through it, creating a shadow behind it. Therefore, a cardboard cutout can make a shadow.

Conclusion:
Out of the given objects, only a cardboard cutout can make a shadow. It is important to note that for an object to create a shadow, it needs to be partially or completely opaque, blocking the light from the source.

Shining a second flashlight on the object will not make the shadow disappear. It may create an additional shadow but won't eliminate the first one.

When you shine a flashlight on an object in a dark room, it casts a shadow. The shadow is a dark area that forms on the side of the object facing away from the light source.

The dark area that forms when an object blocks the path of light is called a shadow.

The main source of light in our sky during the day is the sun. It provides us with daylight.

A clear plastic bottle is most likely to let light pass through it because it is transparent, allowing light to go through.

We call the path that light travels in straight lines a "light ray." Light rays move in straight lines until they hit an object or surface, causing shadows to form.

The change in the shape and size of a shadow when you move the object closer to or farther away from the light source is called "shadow stretch."