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Q1. Magnesium Hydroxide is Used as an Antacid
Correct Answer:
Magnesium hydroxide / Milk of magnesia
Detailed Explanation:
Magnesium hydroxide is a chemical compound commonly used as an antacid medicine. It is also called Milk of Magnesia. Our stomach naturally produces hydrochloric acid (HCl) to help in digestion of food. Sometimes the stomach produces too much acid due to spicy food, irregular eating habits, stress, or overeating. This excess acid causes acidity, indigestion, stomach pain, and a burning sensation in the chest known as heartburn.
To reduce this extra acid, doctors recommend antacids. Magnesium hydroxide is a mild base that reacts with the excess acid and neutralizes it. As a result, the stomach gets relief and digestion becomes more comfortable.
Step-by-Step Process:
- Food enters the stomach.
- Hydrochloric acid helps digest food.
- Sometimes acid becomes excessive.
- Excess acid causes burning and irritation.
- Magnesium hydroxide neutralizes extra acid.
- Relief from acidity is obtained.
Chemical Reaction:
Magnesium hydroxide + Hydrochloric acid → Magnesium chloride + Water
Real Life Examples:
- Antacid syrups used for acidity contain magnesium hydroxide.
- Doctors recommend Milk of Magnesia for indigestion and stomach discomfort.
Key Points:
- Magnesium hydroxide is a weak base.
- It is used as an antacid.
- It reduces stomach acidity safely.
- It provides quick relief from heartburn.
Q2. Mirror Formula
Correct Answer:
1/v + 1/u = 1/f
Detailed Explanation:
The mirror formula is an important formula in the chapter of Light and Reflection. It shows the relationship between object distance, image distance, and focal length of a spherical mirror.
In this formula:
- u = object distance
- v = image distance
- f = focal length
This formula is mainly used in numerical problems involving concave and convex mirrors. Scientists and students use this formula to calculate where an image will be formed.
Understanding the Formula:
When light rays strike a mirror, they reflect according to the laws of reflection. Depending on the shape of the mirror and the position of the object, the image may be real, virtual, erect, or inverted.
The mirror formula helps calculate:
- Position of image
- Nature of image
- Focal length of mirror
Step-by-Step Understanding:
- An object is placed before the mirror.
- Light rays reflect from the mirror surface.
- Reflected rays form an image.
- Distances are measured using sign convention.
- Formula is applied to solve the problem.
Uses in Daily Life:
- Used in car mirrors.
- Used in telescopes.
- Used in shaving and makeup mirrors.
- Used in scientific optical instruments.
Key Points:
- Applicable to spherical mirrors only.
- Based on reflection of light.
- Important for numerical calculations.
- Sign convention must be followed carefully.
Q3. Cerebellum Controls Voluntary Actions
Correct Answer:
Cerebellum
Detailed Explanation:
The cerebellum is an important part of the human brain. It is located below the cerebrum at the back side of the brain. The cerebellum mainly controls balance, posture, and coordination of muscles.
Activities such as walking in a straight line, riding a bicycle, dancing, and maintaining body balance are controlled by the cerebellum. It ensures that body movements happen smoothly and accurately.
If the cerebellum gets damaged, a person may lose body balance and face difficulty while walking or performing movements.
Step-by-Step Function:
- Brain sends signals to body muscles.
- Cerebellum coordinates these signals.
- Muscles move in a controlled way.
- Body balance is maintained.
- Smooth movement becomes possible.
Main Functions:
- Maintains body posture
- Controls body balance
- Coordinates voluntary movements
- Helps in muscle control
Real Life Examples:
- Walking on a narrow road without falling.
- Playing sports like football or cricket.
Key Points:
- Cerebellum is called the balance center of the brain.
- It controls muscular coordination.
- Important for smooth body movement.
- Helps maintain posture and stability.
Q4. Budding Occurs in Yeast
Correct Answer:
Yeast
Detailed Explanation:
Budding is a type of asexual reproduction in which a new organism develops from a small outgrowth called a bud. Yeast reproduces mainly through budding under suitable conditions.
In budding, the parent organism forms a small projection on its body. The nucleus divides, and one part enters the bud. The bud grows gradually and finally separates to become an independent organism.
This process is simple, fast, and requires only one parent.
Step-by-Step Process:
- A small bud appears on the yeast cell.
- The nucleus divides into two parts.
- One nucleus enters the bud.
- The bud grows in size.
- The bud separates and forms a new yeast cell.
Importance:
- Helps rapid multiplication.
- Common in microorganisms.
- Requires only one parent organism.
Real Life Examples:
- Yeast is used in baking bread.
- Used in preparation of cakes and fermented products.
Key Points:
- Budding is an asexual reproduction method.
- Yeast reproduces rapidly through budding.
- Offspring are similar to parent cells.
- No fertilization is required.
Q5. Commercial Unit of Electrical Energy
Correct Answer:
Kilowatt-hour (kWh)
Detailed Explanation:
Electrical energy used in homes, schools, offices, and industries is measured in kilowatt-hour. This unit is called the commercial unit of electrical energy because electricity departments use it while preparing electricity bills.
One kilowatt-hour means using 1000 watts of electrical power for one hour.
Formula:
Electrical Energy = Power × Time
Step-by-Step Understanding:
- Electrical appliances consume electricity.
- Power is measured in watts or kilowatts.
- Time is measured in hours.
- Multiplying power and time gives energy consumed.
- Electricity bill is calculated in kWh units.
Example:
If a 1000 W heater runs for 1 hour:
Energy consumed = 1 kilowatt-hour
If a 100 W bulb runs for 10 hours:
Energy consumed = 100 × 10 = 1000 watt-hours = 1 kWh
Uses in Daily Life:
- Electricity bills are calculated in kWh.
- Used for measuring household electricity consumption.
- Helps monitor energy usage.
Key Points:
- kWh is the commercial unit of electrical energy.
- 1 kilowatt = 1000 watts.
- More appliance usage increases electricity consumption.
- Important for calculating electricity bills.
Extra Learning Notes
Science concepts are closely connected with daily life. Antacids help maintain stomach health, mirrors are used in many optical devices, the cerebellum controls body balance, yeast helps in food preparation, and electrical energy powers almost every modern machine.
Learning these concepts with examples makes science easier and more interesting. Understanding basic scientific principles also improves practical knowledge and problem-solving ability.
Quick Revision Points
Magnesium Hydroxide
- Used as antacid
- Neutralizes excess acid
- Gives relief from acidity
Mirror Formula
- 1/v + 1/u = 1/f
- Used in spherical mirrors
- Helps calculate image distance
Cerebellum
- Maintains balance
- Controls coordination
- Helps in smooth movement
Budding in Yeast
- Asexual reproduction
- New organism develops from bud
- Fast reproduction method
Kilowatt-hour
- Commercial unit of electricity
- Used in electricity bills
- Based on power and time calculations