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Q1. Which state of matter is highly compressible? → Gas
Description – Gas is the state of matter that can be compressed very easily. In gases, the particles are very far away from each other. Because there is a large empty space between gas particles, they can come closer when pressure is applied. This is why gases are called highly compressible substances.
Unlike solids and liquids, gases do not have a fixed shape or fixed volume. They spread in all directions and completely fill the container in which they are kept. Gas particles move very fast and randomly, which also helps them get compressed easily.
Easy Step-by-Step Explanation:
Step 1: Matter is made up of very tiny particles.
Step 2: In gases, these particles are far apart.
Step 3: Large empty spaces exist between particles.
Step 4: When pressure is applied, particles move closer.
Step 5: Because of this, gases get compressed easily.
Why Solids Cannot Be Compressed Easily:
In solids, particles are tightly packed together. There is almost no empty space between them. So, pressing a solid does not reduce its size much.
Why Liquids Are Slightly Compressible:
Liquid particles are closer than gases but not as tightly packed as solids. Therefore, liquids can compress only a little.
Important Characteristics of Gases:
• No fixed shape
• No fixed volume
• Highly compressible
• Fill the entire container
• Particles move freely
Real-Life Examples:
Example 1:
LPG gas cylinders store gas in compressed form to save space.
Example 2:
Compressed air is filled in bicycle and car tires.
Scientific Reason Behind Compressibility:
Gas particles have very weak force of attraction between them. Because of this weak attraction, particles move freely and can be pushed closer together.
Uses of Compressible Gases:
• Oxygen cylinders in hospitals
• CNG vehicles
• Spray bottles and deodorants
• Refrigeration systems
Key Points:
• Gas is highly compressible.
• Gas particles are far apart.
• Empty spaces help in compression.
• Gases occupy all available space.
Key Learning:
Gas is highly compressible because there are large empty spaces between its particles.
Q2. Unit of force is Newton
Description – The SI unit of force is Newton. Force means a push or pull that can change the speed, direction, or shape of an object. Whenever we push, pull, lift, throw, or stop something, force is involved.
The unit Newton is named after the famous scientist Sir Isaac Newton, who gave the laws of motion.
Formula of Force:
Force = Mass × Acceleration
F = m × a
Where:
F = Force
m = Mass
a = Acceleration
Easy Understanding of the Formula:
If a heavier object has to move faster, more force is needed. This is why force depends on both mass and acceleration.
Step-by-Step Explanation:
Step 1: An object is at rest or moving slowly.
Step 2: A push or pull acts on it.
Step 3: The speed or direction changes.
Step 4: This effect is called force.
Step 5: Force is measured in Newton.
Understanding One Newton:
If a force changes the speed of a 1 kg object by 1 meter per second every second, that force is called 1 Newton.
1 N = 1 kg × 1 m/s²
Examples from Daily Life:
Example 1:
Kicking a football applies force and changes its motion.
Example 2:
Pushing a shopping cart in a supermarket requires force.
Different Types of Force:
• Muscular force
• Frictional force
• Gravitational force
• Magnetic force
• Electrostatic force
Importance of Force in Daily Life:
• Helps in movement
• Used in machines
• Important in vehicles
• Used in sports and engineering
Interesting Fact:
Even opening a door or writing with a pen requires force.
Key Points:
• Force is a push or pull.
• SI unit of force is Newton.
• Formula is F = m × a.
• Force changes motion of objects.
Key Learning:
Newton is the SI unit of force because it measures the effect of push or pull on an object.
Q3. Electron was discovered by J.J. Thomson
Description – The electron was discovered by J.J. Thomson in the year 1897. This discovery was very important because scientists earlier believed that atoms could not be divided. Thomson proved that atoms contain smaller particles called electrons.
He discovered electrons using the cathode ray experiment.
What Are Electrons?
Electrons are very tiny negatively charged particles present inside atoms. They move around the nucleus of an atom.
Cathode Ray Experiment:
J.J. Thomson used a glass tube called a discharge tube. Inside the tube, gas was kept at very low pressure. When high voltage electricity was passed, invisible rays moved from cathode to anode. These were called cathode rays.
Thomson noticed that these rays bent toward the positive plate, showing that they carried negative charge.
Step-by-Step Explanation:
Step 1: A discharge tube was prepared.
Step 2: Gas pressure inside the tube was reduced.
Step 3: High voltage current was passed.
Step 4: Cathode rays were produced.
Step 5: Rays bent toward the positive plate.
Step 6: Thomson concluded that rays carried negative charge.
Step 7: These particles were named electrons.
Properties of Electrons:
• Carry negative charge
• Very small in size
• Present in all atoms
• Move around nucleus
Importance of Electron Discovery:
• Changed atomic theory
• Helped scientists understand atoms better
• Led to invention of electronic devices
Examples in Daily Life:
Example 1:
Electric current in wires flows because of moving electrons.
Example 2:
Televisions, computers, and mobile phones work using electron movement.
About J.J. Thomson:
• British scientist
• Nobel Prize winner
• Known as discoverer of electron
Interesting Fact:
The discovery of electrons became the foundation of modern electronics.
Key Points:
• Electron was discovered in 1897.
• J.J. Thomson discovered it.
• Cathode ray experiment helped in discovery.
• Electrons are negatively charged particles.
Key Learning:
J.J. Thomson discovered electrons and proved that atoms contain smaller charged particles.
Q4. Speed is a scalar quantity
Description – Speed is a scalar quantity because it has only magnitude and no direction. It tells us how fast an object is moving. It does not tell the direction of movement.
For example, if a car moves at 60 km/h, only the speed is known. The direction is not mentioned, so speed is scalar.
Formula of Speed:
Speed = Distance ÷ Time
S = d / t
Where:
S = Speed
d = Distance
t = Time
Easy Explanation of Formula:
If more distance is covered in less time, the speed becomes higher.
Step-by-Step Explanation:
Step 1: Measure total distance traveled.
Step 2: Measure time taken.
Step 3: Divide distance by time.
Step 4: The result gives speed.
Numerical Example:
If a train travels 120 km in 2 hours:
Speed = 120 ÷ 2
Speed = 60 km/h
Difference Between Speed and Velocity:
Speed:
• Scalar quantity
• Only magnitude
• No direction
Velocity:
• Vector quantity
• Has magnitude and direction
Examples from Daily Life:
Example 1:
A bike moving at 40 km/h shows speed.
Example 2:
A runner completing 100 meters in 10 seconds has speed.
SI Unit of Speed:
Meter per second (m/s)
Other Common Units:
• km/h
• cm/s
Importance of Speed:
• Used in transport systems
• Important in sports
• Helps calculate travel time
• Used in machines and engineering
Interesting Fact:
A cheetah is one of the fastest animals and can run at very high speed.
Key Points:
• Speed is scalar quantity.
• It has magnitude only.
• Formula = Distance ÷ Time.
• SI unit is m/s.
Key Learning:
Speed is scalar because it tells only how fast an object moves, not the direction.
Q5. Xylem transports water
Description – Xylem is a special plant tissue that transports water and minerals from roots to all parts of the plant. It helps water move upward from roots to stems, branches, and leaves.
Without xylem tissue, plants would not be able to receive water properly and could dry up.
How Xylem Works:
Roots absorb water and minerals from the soil. Xylem vessels then carry this water upward throughout the plant body.
Easy Step-by-Step Process:
Step 1: Roots absorb water from soil.
Step 2: Water enters root cells.
Step 3: Xylem vessels carry water upward.
Step 4: Water reaches stem and leaves.
Step 5: Leaves use water for photosynthesis and growth.
Parts of Xylem:
• Xylem vessels
• Tracheids
• Xylem fibers
• Xylem parenchyma
Functions of Xylem:
• Transport water
• Transport minerals
• Provide support to plant
• Help in plant growth
Difference Between Xylem and Phloem:
Xylem:
• Carries water and minerals
• Movement mostly upward
Phloem:
• Carries prepared food
• Movement in all directions
Examples from Daily Life:
Example 1:
Tall trees receive water in upper leaves through xylem tissue.
Example 2:
Fresh green plants survive because xylem continuously supplies water.
Importance of Water Transport:
• Needed for photosynthesis
• Helps plant growth
• Maintains freshness of leaves
• Prevents drying
Interesting Fact:
Water travels several meters upward in very tall trees through xylem vessels.
Key Points:
• Xylem transports water and minerals.
• Water moves from roots to leaves.
• Xylem also provides support.
• It is an important conducting tissue.
Key Learning:
Xylem helps plants survive by carrying water and minerals from roots to every part of the plant.
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