Test Your Basics: Science Quiz For Class 3

Chickens are famous for laying eggs! They are birds, and most birds reproduce by laying eggs. The egg contains everything the baby chick needs to grow until it's ready to hatch. Dogs, cats, and cows are mammals, and mammals give birth to live young. This means their babies develop inside their mother's bodies and are born live, not from eggs. So, while chickens cluck and lay eggs, dogs bark and have puppies!

Plants are like little food factories! They need sunlight, water, and air to make their own food through a process called photosynthesis. Sunlight provides the energy, water carries nutrients from the soil, and air provides carbon dioxide. Just like we need food to grow big and strong, plants need these things to grow tall and healthy. Without sunlight, water, or air, plants won't be able to make their food and they will eventually wither and die. It's like they're breathing in the air and drinking up the sunshine!

Mars is known as the red planet because of its reddish appearance. This distinctive feature sets Mars apart from other planets in our solar system. This coloration comes from the abundance of iron oxide, or rust, on its surface. Iron oxide is a compound formed when iron reacts with oxygen, much like how rust forms on Earth. This rusty dust covers the Martian landscape, giving it a reddish hue that is visible even from Earth.

To transform solid ice into liquid water, you need to add heat energy. Heat increases the kinetic energy of the water molecules within the ice. As they gain energy, the molecules vibrate more vigorously, eventually overcoming the forces holding them in the solid ice structure. This added energy causes the ice to melt, transitioning from a solid to a liquid state.

Jupiter reigns supreme as the largest planet in our solar system. Its immense size is truly remarkable; it's so big that you could fit all the other planets inside it! Jupiter's composition is primarily hydrogen and helium, similar to the Sun, making it a gas giant. Its massive size creates a powerful gravitational pull, influencing the orbits of other celestial bodies in the asteroid belt and beyond. This giant planet plays a crucial role in the dynamics of our solar system.

Mercury holds the distinction of being the closest planet to the Sun. Its proximity to our star makes it the fastest planet to orbit the Sun, completing a revolution in just 88 Earth days. However, this close proximity also means Mercury experiences extreme temperature variations. The side facing the Sun gets incredibly hot, while the side facing away plunges into frigid temperatures due to the lack of an atmosphere to distribute heat evenly.  

Our skin is like a superhero suit that covers our entire body! It's the largest organ we have, and it does so much to protect us. It keeps out germs, helps us feel things, and even helps control our body temperature. Our skin is made up of many layers working together to keep us safe and healthy. While our heart pumps blood and our brain helps us think, our skin is the biggest and most visible organ we have.

When water changes from a liquid to a gas, like when a puddle dries up or when water boils in a pot, it's called evaporation. The water turns into a gas called water vapor and goes into the air. Melting is when a solid turns into a liquid, freezing is when a liquid turns into a solid, and condensation is when a gas turns back into a liquid. So, when water disappears from a puddle, it's because of evaporation!

In a uniform medium, light travels in straight lines, a principle known as rectilinear propagation. Imagine shining a flashlight in a dark room; the beam of light appears as a straight line. This happens because light waves travel in a straight path unless they encounter an obstacle or a change in medium. This property of light is fundamental to how we see and how optical instruments like cameras and telescopes work.

Motion describes the change in an object's position over time. It's a fundamental concept in physics and is characterized by quantities like displacement, velocity, and acceleration. Mass is a measure of how much matter is in an object. Weight is the force of gravity on an object. The solar system is the collection of planets, stars, and other celestial bodies gravitationally bound to our Sun.  Sources and related content

Burning toast is a chemical change, not a physical one. When toast burns, it undergoes a chemical reaction with oxygen, producing new substances with different properties (like the charred, dark parts). Physical changes, on the other hand, only alter the form or appearance of a substance without changing its chemical composition. Cutting, crumbling, and slicing are all examples of physical changes because they don't create new substances.  

Mass is a fundamental property of all matter. Solids, liquids, and gases are all states of matter, and therefore, they all possess mass. Mass is a measure of how much "stuff" is in an object. Even seemingly weightless gases have mass, although it can be more challenging to measure. The amount of mass an object has determines its inertia, or its resistance to changes in motion.

The Sun, stars, and candles all generate their own light. They are luminous objects. The Moon, however, is a non-luminous object. It shines because it reflects sunlight. The sunlight bounces off the Moon's surface and travels to our eyes, making the Moon appear bright in the night sky. So, while the Moon appears to glow, it's actually acting like a giant mirror reflecting the Sun's light.

While the most commonly encountered states of matter are solid, liquid, and gas, there are actually more. Plasma, an ionized gas, is considered the fourth state of matter. In extreme conditions, like those found in stars, matter can exist as plasma. Additionally, Bose-Einstein condensates, a state of matter achieved at extremely low temperatures, are sometimes considered a fifth state.