Class 5 Science - Light and Shadow - CBSE Worksheets Solutions - 2

Q1: Fill in the Blanks.

(i) Shadows are formed when an object _______ light.
Ans: blocks
Shadows are formed when an object blocks the path of light.

(ii) The direction of the shadow depends on the position of the _______.
Ans: light source
The direction of the shadow is determined by the position of the light source.

(iii) During a solar eclipse, the _______ comes between the Sun and the Earth, casting a shadow on the Earth's surface.
Ans: Moon
During a solar eclipse, the Moon comes between the Sun and the Earth, casting a shadow on the Earth's surface.

(iv) A shadow is always _______ than the object that casts it.
Ans: darker
A shadow is always darker than the object that casts it.

(v) The length of the shadow changes with the _______ of the Sun in the sky.
Ans: position
The length of the shadow changes with the position of the Sun in the sky.

Q2: Match the Column.

Ans: Transparent - A material that allows light to pass through it.
Opaque - A material that does not allow light to pass through it.
Solar Eclipse - When the Moon comes between the Sun and the Earth, casting a shadow on the Earth's surface.
Light Source - An object that emits light.
Umbra - The darkest part of a shadow where all light is blocked.
Penumbra - The lighter part of a shadow where only some light is blocked.

Q3: True or False.

(ii) A solar eclipse occurs when the Earth comes between the Sun and the Moon.
Ans: False
A solar eclipse occurs when the Moon comes between the Sun and the Earth.

(iii) Transparent materials do not allow light to pass through them.
Ans: False
Transparent materials allow light to pass through them.

(iv) The length of the shadow remains the same throughout the day.
Ans: False
The length of the shadow changes with the position of the Sun in the sky.

(v) The penumbra is the darkest part of a shadow.
Ans: False
The penumbra is the lighter part of a shadow where only some light is blocked.

Q4: Pick the Odd One Out.

(i) Sun, Moon, Stars, Earth
Ans: Earth
Sun, Moon, and Stars are celestial objects that emit or reflect light, while Earth is a planet that reflects light but does not emit light.

(ii) Flashlight, Candle, Mirror, Torch
Ans: Mirror
Flashlight, Candle, and Torch are light sources, but Mirror reflects light and is not a source of light.

(iii) Solar Eclipse, Lunar Eclipse, Umbra, Penumbra
Ans: Umbra
Solar Eclipse, Lunar Eclipse, and Penumbra are related to shadows and eclipses, while Umbra is the darkest part of a shadow.

(iv) Transparent, Opaque, Translucent, Reflection
Ans: Reflection
Transparent, Opaque, and Translucent describe how materials interact with light, while Reflection is a different concept related to the bouncing of light.

(v) Morning, Noon, Midnight, Dawn
Ans: Dawn
Morning, Noon, and Midnight are specific times of the day, while Dawn refers to the early light before sunrise.

Q5: Short Answer Questions.

(i) What is a shadow? Provide an example.
Ans: A shadow is a dark area formed when an object blocks the path of light. For example, when you stand in front of a flashlight, your body casts a shadow on the wall. Shadows help us understand how light travels and interacts with objects.

(ii) Why do shadows change their length during the day?
Ans: Shadows change their length during the day because the position of the Sun in the sky changes. When the Sun is low on the horizon, shadows are longer because the light rays have to cover a greater distance to reach the object. When the Sun is high in the sky, shadows are shorter as the light rays travel a shorter distance to reach the object.

(iii) What is the difference between a solar eclipse and a lunar eclipse?
Ans: A solar eclipse occurs when the Moon comes between the Sun and the Earth, casting a shadow on the Earth's surface. During a solar eclipse, the Moon blocks the light from the Sun, causing darkness on Earth for a brief period. On the other hand, a lunar eclipse occurs when the Earth comes between the Sun and the Moon, and the Earth's shadow falls on the Moon, causing the Moon to appear darkened.

(iv) Explain the terms "umbra" and "penumbra" with respect to shadows.
Ans: The "umbra" is the darkest part of a shadow, where all light is blocked. It is the region behind the object that is entirely deprived of direct light from the light source. The "penumbra" is the lighter part of a shadow that surrounds the umbra. It is the area where only some of the light from the light source is blocked, creating a partial shadow.

(v) Give three examples of transparent materials and three examples of opaque materials.
Ans: Transparent materials allow light to pass through them without any significant scattering or absorption. Examples include glass, water, and clear plastic. Opaque materials do not allow light to pass through them at all; they absorb or reflect light. Examples of opaque materials are wood, metal, and brick.