Welcome To My School Study
Do You Know
1. Boiling (Bulk Phenomenon)
Boiling is the process in which a liquid changes into gas throughout the entire liquid.
Why it is called a bulk phenomenon:
- The change occurs in the whole liquid, not just on the surface
- Bubbles are formed inside the liquid during boiling
Important Points:
- Boiling takes place at a fixed temperature called the boiling point
- Heat energy is required for boiling
Difference from evaporation:
- Boiling → happens throughout the liquid
- Evaporation → happens only at the surface
Example:
Water boiling in a kettle at 100°C.
2. Unit of Power – Watt (W)
Power measures how quickly work is done or energy is used.
Formula:
Power = Work ÷ Time
SI Unit: Watt (W)
Understanding Power:
- Higher power means faster work
- Lower power means slower work
Examples:
- Electric bulb
- Fan
- Heater
Electrical appliances are often rated in watts.
3. Charge on Neutron – Neutral
A neutron is a subatomic particle present inside the nucleus of an atom.
Charge of neutron:
- It has no electrical charge, so it is neutral.
Comparison with other particles:
- Proton → positive charge
- Electron → negative charge
- Neutron → no charge
Importance:
Neutrons help maintain the stability of the atomic nucleus.
4. Types of Acceleration
Acceleration is the rate at which velocity changes with time.
Formula:
Acceleration = Change in velocity ÷ Time
Acceleration can be:
- Positive → speed increases
- Negative → speed decreases
- Zero → speed remains constant
Understanding:
An object may speed up, slow down, or move with constant speed.
Examples:
- Car speeding up → positive acceleration
- Braking vehicle → negative acceleration
- Train moving at constant speed → zero acceleration
5. Function of Phloem (Transport of Food)
Phloem is a plant tissue responsible for transporting food from leaves to different parts of the plant.
Main Functions:
- Carries glucose and nutrients
- Supplies food to roots, stems, and fruits
Direction of movement:
Food can move both upward and downward in phloem.
Difference from Xylem:
- Phloem → transports food
- Xylem → transports water and minerals
Example:
Food prepared in leaves during photosynthesis is transported through phloem.