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ScienceClass 6CBSE

What is reflection of light?

Reflection of light is the bouncing back of light rays when they strike a smooth and shiny surface, such as a mirror. When light falls on such a surface, a part of it returns into the same medium. This is how images are formed in mirrors.

ScienceClass 6CBSE

In a completely dark room, can you see your reflection in a mirror?

No, we cannot see our reflection in a mirror in a completely dark room. This is because light is necessary for vision. When there is no light, no rays are reflected from our body or the mirror to our eyes, making it impossible to see anything.

ScienceClass 6CBSE

What is umbra?

Umbra is the darkest part of a shadow where light from the source is completely blocked by an object. In this region, no light reaches at all. It forms when an opaque object completely obstructs the path of light.

ScienceClass 6CBSE

What are opaque materials?

Opaque materials are those that do not allow light to pass through them at all. These materials completely block light, so objects behind them cannot be seen. Examples include wood, metal, and stone.

ScienceClass 6CBSE

What are translucent materials?

Translucent materials allow only some light to pass through them. As a result, objects seen through them appear blurred or unclear. They partially block light. Examples include wax paper, frosted glass, and thin plastic sheets.

ScienceClass 6CBSE

What are transparent materials?

Transparent materials are those substances that allow light to pass through them completely. Because of this, objects on the other side can be seen clearly. These materials do not block light. Examples include glass, clean water, and air.

ScienceClass 6CBSE

What are artificial sources of light?

Artificial sources of light are man-made sources that produce light. These are created by humans to provide illumination, especially during nighttime or in dark places. Examples include electric bulbs, tube lights, candles, and gas lamps. These sources are very useful in daily life for lighting homes, streets, and workplaces.

ScienceClass 6CBSE

What is light?

Light is a form of energy that enables us to see objects around us. It travels in the form of waves and does not require a medium to propagate. Although we often describe it as “invisible energy,” it becomes visible when it reflects off objects and enters our eyes. Without light, our surroundings would appear completely dark, and vision would not be possible.

ScienceClass 6CBSE

Write a short note on the water cycle.

The water cycle is the continuous movement of water on, above, and below the surface of the Earth. It involves several processes such as evaporation, condensation, precipitation, and collection. Water from oceans, rivers, lakes, and plants evaporates due to the heat of the sun and rises into the atmosphere as water vapour. This vapour cools and condenses to form clouds. When the clouds become heavy, water falls back to the Earth as rain, snow, or hail, which i

ScienceClass 6CBSE

Why does the rate of evaporation increase on increasing the temperature?

Evaporation is the process by which a liquid changes into vapour. When the temperature increases, the particles of the liquid gain more kinetic energy. Because of this increased energy, the molecules move faster and are able to overcome the forces holding them together in the liquid state. As a result, more molecules escape from the surface of the liquid into the air as vapour. Therefore, higher temperature increases the rate of evapor

ScienceClass 6CBSE

How are rivers and streams formed?

Rivers and streams are formed mainly from rainwater and melting snow. When snow on mountains melts, it turns into water and flows downhill due to gravity. This flowing water forms small channels called streams. Many streams join together to form rivers, which flow across land for long distances. Rivers collect water from rainfall, tributaries, and groundwater along their path. Eventually, most rivers empty into lakes, seas, or oceans.

ScienceClass 6CBSE

Why is water used as a coolant in engines?

Water is used as a coolant in engines because it has a high specific heat capacity, which means it can absorb a large amount of heat without a significant rise in temperature. During the combustion of fuel in an engine, a large amount of heat is produced. Water circulating in the radiator system absorbs this heat and carries it away, preventing the engine from overheating. By cooling the engine, water helps in:

ScienceClass 6CBSE

Which process is involved in the removal of salt from sea water?

Ans. The process used to remove salt from seawater is called desalination. This process converts saline water into fresh water suitable for drinking and other uses. One common method of desalination involves evaporation followed by condensation. In this method, seawater is heated so that water evaporates and leaves the salt behind. The water vapour is then cooled and condensed to form pure water. Another modern method is reverse

ScienceClass 6CBSE

What is the role of transpiration in plants?

Transpiration is the process by which plants lose water in the form of water vapour from the surface of their leaves through small openings called stomata. Transpiration plays several important roles in plants: It helps in cooling the plant during hot weather. It helps in the transport of water and minerals from roots to other parts of the plant. It maintains the water bala

ScienceClass 6CBSE

Is there any variation in the amount of water present on the earth?

Ans. No, the total amount of water present on Earth remains almost constant. Water continuously circulates between the oceans, atmosphere, land, and living organisms through the water cycle. In this cycle, water evaporates from oceans, lakes, and rivers into the atmosphere, forms clouds through condensation, and returns to the Earth as precipitation in the form of rain, snow, or hail. This continuous circulation maintains the balance of water on Earth.</

ScienceClass 6CBSE

How does rainwater harvesting increase the water level of underground water?

Rainwater harvesting is the process of collecting and storing rainwater for future use. In this method, rainwater from rooftops or open areas is directed into storage tanks or allowed to seep into the ground through pits and recharge wells. When rainwater seeps into the soil, it recharges underground water sources and raises the water table. This helps in: Increasing groundwater levels Reducing water

ScienceClass 6CBSE

Why does ice float on the surface of water?

Ice floats on water because it is less dense than liquid water. When water freezes, its molecules arrange themselves in a fixed crystal structure with spaces between them. This structure occupies more volume and reduces the density of ice. Since substances with lower density float on substances with higher density, ice floats on the surface of water. This property is very important for aquatic life because lakes and ponds freeze only at the surface while water

ScienceClass 6CBSE

Why is water called a universal solvent?

Water is called the universal solvent because it can dissolve a large number of substances compared to most other liquids. Many solids, liquids, and gases dissolve easily in water. For example, salt, sugar, minerals, and gases like oxygen and carbon dioxide dissolve in water. This property of water is very important in nature and in living organisms. It helps in: Transporting nutrients in plants and animals <

ScienceClass 6CBSE

How much percentage of salt is present in salt water?

Seawater contains a large amount of dissolved salts, which makes it salty. On average, seawater contains about 3.5% dissolved salts. These salts include sodium chloride (common salt) along with salts of calcium, magnesium, potassium, and sulphates. Because of this high salt content, seawater is not suitable for drinking unless the salt is removed through desalination processes.

ScienceClass 6CBSE

How do wet clothes become dry?

Wet clothes become dry because of the process called evaporation. In this process, the water present in the clothes changes into water vapour and mixes with the air. Heat from the surroundings or sunlight provides energy to the water molecules, allowing them to escape into the air. The rate of evaporation increases when: The temperature is high (sunlight or warm air) The wind is blowing (moving air ca

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