CLASS 3 SCEINCE :Understanding Light

<p>The light is reflected. (A)</p> Signup and view all the answers

<p>A piece of frosted glass (C)</p> Signup and view all the answers

<p>Because the Sun provides light that reflects off the objects. (C)</p> Signup and view all the answers

<p>The blockage of light by an opaque object (C)</p> Signup and view all the answers

<p>The shadow gets shorter (C)</p> Signup and view all the answers

<p>They reflect light. (C)</p> Signup and view all the answers

<p>An object that gives off its own light. (D)</p> Signup and view all the answers

<p>Ceramics (C)</p> Signup and view all the answers

<p>Light can pass through clear glass but not through ceramic. (A)</p> Signup and view all the answers

<p>The length of a shadow always remains constant regardless of the time of day. (A)</p> Signup and view all the answers

<p>Objects block the light coming towards them. (C)</p> Signup and view all the answers

<p>A frosted glass window (C)</p> Signup and view all the answers

<p>To ensure that the word can be read correctly in a rearview mirror. (D)</p> Signup and view all the answers

<p>A book (B)</p> Signup and view all the answers

<p>Artificial light sources, such as lamps or candles, provide enough illumination. (B)</p> Signup and view all the answers

<p>The light from the torch bounces off the chair and then enters Chinmaya's eyes. (D)</p> Signup and view all the answers

<p>Our eyes are not positioned to receive the reflected light from our feet. (B)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>True (A)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>True (A)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>True (A)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>True (A)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>True (A)</p> Signup and view all the answers

<p>True (A)</p> Signup and view all the answers

<p>True (A)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>True (A)</p> Signup and view all the answers

<p>light</p> Signup and view all the answers

<p>source</p> Signup and view all the answers

<p>luminous</p> Signup and view all the answers

<p>Eyes</p> Signup and view all the answers

<p>reflected</p> Signup and view all the answers

<p>reflects</p> Signup and view all the answers

<p>transparent</p> Signup and view all the answers

<p>translucent</p> Signup and view all the answers

<p>straight</p> Signup and view all the answers

<p>Shadows</p> Signup and view all the answers

<p>sunlight</p> Signup and view all the answers

<p>sources</p> Signup and view all the answers

<p>light</p> Signup and view all the answers

<p>dark</p> Signup and view all the answers

<p>opaque</p> Signup and view all the answers

<p>shadow</p> Signup and view all the answers

<p>Light</p> Signup and view all the answers

<p>Mirrors are smooth and shiny, reflecting light regularly. Walls are rough, reflecting light irregularly, so we can't see a clear reflection.</p> Signup and view all the answers

<p>Shadows are shorter at noon when the Sun is high in the sky. They are longer in the morning and evening when the Sun is lower. This is because the angle of the sunlight changes.</p> Signup and view all the answers

<p>Clear glass is transparent, allowing all light to pass through. Frosted glass is translucent, only allowing some light to pass, making it harder to see clearly.</p> Signup and view all the answers

<p>An example of a translucent object is waxed paper or a piece of frosted glass.</p> Signup and view all the answers

<p>A shadow is formed because the light source is blocked by an opaque object. Since no light can reach the area behind the object, it appears dark, hence black.</p> Signup and view all the answers

<p>We need light to see objects because light bounces off objects and enters our eyes. This reflected light allows us to perceive the object's shape and color.</p> Signup and view all the answers

<p>The word 'AMBULANCE' is written in reverse on the front of the ambulance so that drivers approaching from the opposite direction can read it correctly in their rearview mirror.</p> Signup and view all the answers

<p>Luminous objects are objects that produce their own light. Examples include the Sun, stars, candles, and electric bulbs.</p> Signup and view all the answers

<p>We cannot see our reflection in our feet because our feet do not reflect light back into our eyes. To see a reflection, a smooth surface like a mirror is needed to reflect the light back to our eyes.</p> Signup and view all the answers

<p>Natural sources of light occur naturally, such as the Sun, stars, fireflies, and lightning. Man-made sources are created by humans, such as candles, torches, lamps, and electric bulbs.</p> Signup and view all the answers

<p>We can see non-luminous objects in the dark when light from a luminous source falls on them and reflects into our eyes.</p> Signup and view all the answers

<p>The Sun is considered the main source of light on Earth because it provides natural light necessary for warmth and visibility.</p> Signup and view all the answers

<p>Mirrors reflect light, allowing us to see our reflection because light bounces off our face and into the mirror.</p> Signup and view all the answers

<p>Two man-made sources of light are candles and electric bulbs, which are used for illumination in homes.</p> Signup and view all the answers

<p>Transparent objects allow light to pass through completely, while opaque objects block light completely.</p> Signup and view all the answers

<p>Light travels in a straight line and is blocked by an opaque object, creating a shadow in the area where the light cannot reach.</p> Signup and view all the answers

<p>Translucent materials allow some light to pass through, making objects behind them partially visible.</p> Signup and view all the answers

<p>Opaque objects do not permit any light to pass through, preventing visibility of objects behind them.</p> Signup and view all the answers

<p>Shadows are shorter when the Sun is high in the sky and longer during the early morning and late afternoon when the Sun is low.</p> Signup and view all the answers

<p>The word 'AMBULANCE' is written in reverse on the front of an ambulance so that drivers approaching from the opposite direction can easily read it in their rearview mirrors. This is because light travels in straight lines and is reflected when it hits a surface, like a mirror, at an angle. When a driver looks at the ambulance in their rearview mirror, the reversed letters appear upright because the light from the ambulance is reflected off the mirror and into their eyes.</p> Signup and view all the answers

<p>The glass container is transparent, meaning it allows most light to pass through it. So, when light from a source (like the sun or a lamp) shines on the glass container, it travels through the glass, illuminates the toy, and reflects back into our eyes, allowing us to see the toy. The ceramic container, on the other hand, is opaque, meaning it does not allow any light to pass through it. Therefore, the light cannot reach the toy inside the ceramic container, and we cannot see it. This is similar to how we cannot see objects in a dark room unless they are illuminated by a light source.</p> Signup and view all the answers

The bouncing of light off a surface, like a mirror.

Objects that allow light to pass through completely, making them clear.

Objects that let some light pass through but not enough to see clearly through them.

Objects that do not allow any light to pass through them at all.

A dark area formed when light is blocked by an opaque object.

Things that give off light, including the Sun and candles.

Objects that emit their own light, like the Sun and bulbs.

Objects that do not produce their own light, such as books and tables.

Man-made sources that provide light, like electric bulbs and lanterns.

Sources of light that occur in nature, like the Sun and stars.

When light bounces off an object, enabling us to see it.

Luminous objects emit light; non-luminous do not.

Fireflies emit light; they can be used for lighting in ancient times.

Shadows form when light is blocked by an opaque object, always on the opposite side of the light source.

Light is essential for visibility and warmth; without it, life cannot thrive.

We see objects when light reflects off them and enters our eyes.

The Sun is the primary source of light on Earth.

Man-made sources of light like bulbs, candles, and torches.

A dark area created when an opaque object obstructs light.

Light enables us to see and stay warm; without it, life cannot exist.

Luminous objects emit their own light; non-luminous objects do not.

Sources of light are categorized into natural (like the Sun) and man-made (like bulbs).

Light is necessary for visibility and warmth for life.

Natural sources include the Sun while man-made includes bulbs and candles.

We see objects when light reflects off them and enters our eyes.

Shadows are formed when light is blocked by an opaque object and always appear opposite the light source.

Sunlight is essential for life; without it, Earth would be dark and cold.

Luminous objects give off their own light; non-luminous objects do not.

Sources of light are classified as natural (like the Sun) or man-made (like lamps).

A dark area created when an opaque object blocks light.

Shadows are always black and form when light is blocked.

Insects that emit light and were used as lanterns in ancient times.

We see objects when light reflects off them and enters our eyes.

Man-made sources of light like electric bulbs, torches, and candles.