Explanation

• White goods are durable consumer goods, mainly large household electrical appliances.
• The term originally referred to appliances that were usually finished in white enamel.
• These products are designed for long-term household use.
• Examples: Refrigerator, Washing Machine, Air Conditioner, Dishwasher, Deep Freezer

Additional information:

• Brown goods include entertainment electronics such as TVs, radios, and audio systems.

Last verified on 18-07-2026

Explanation

• The speed of sound is maximum in solids 
• Because particles are tightly packed, allowing faster vibration transfer.
• In iron, sound travels around 5120 m/s,
• Much faster than in air (343 m/s) or water (1482 m/s).

Last updated 17 july 2026 by NA

Explanation

• Surface tension prevents water from penetrating waterproof materials.

Additional information 

• Friction: Force that opposes the motion between two surfaces in contact.
• Adhesion: Attraction between molecules of different substances.
• Gravity: Force that pulls objects toward the Earth

Last updated by NA on 16-07-2026

Explanation

• Insulin and glucagon regulate blood glucose (sugar) levels.
• Insulin lowers blood sugar by helping cells absorb glucose.
• Glucagon raises blood sugar by releasing stored glucose from the liver.
• Both hormones are produced by the pancreas.
• They work together to maintain normal blood sugar levels.

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Explanation

• An endemic disease is a disease that is constantly present in a specific population or geographic area.
• Examples:
• Malaria
• Chickenpox
• Dengue Fever

Additional information 

• Epidemic: A sudden, unexpected spike in cases within a specific community or region.
• Pandemic: An epidemic that has spread globally, covering multiple countries or continents.

Last updated by NA on 16-07-2026

Explanation

• Meteorology is the science of the atmosphere and weather patterns.

Additional information 

• Climatology: weather patterns and climate changes over time.
• Oceanography:  oceans, marine ecosystems, currents, and the seabed.
• Geology: Earth's solid rocks, minerals, and the physical history of its structure.
• Astronomy: celestial objects, space, and the physical universe beyond Earth

Last updated by NA on 16-07-2026

Explanation

• 24-karat (24K) gold is considered the "best"
• Purity: 99.9% pure gold.
• Color: Rich, deep, bright yellow.

Additional information

• 22K Gold: 91.7% pure gold. It is mixed with harder metals like silver or copper.
• 18K Gold: 75% pure gold. It is highly durable and excellent for diamond settings 
• Carat is the unit of measurement for the physical weight of diamonds/gold.

Last updated by NA on 16-07-2026

Explanation

• Neon is the primary gas used in decorative and advertising lights
• The color of the light depends on the gas in the tube.

Additional information

• Argon: Produces a blue or (mixed with mercury) green/purple light.
• Helium: Glows yellow or pink.
• Krypton: Emits a whitish-yellow light.
• Xenon: Creates a violet/lavender light.

Last updated by NA on 16-07-2026

Explanation

• Oranges are well-known for being rich in Vitamin C.
• It is essential for immune function, skin health, and other bodily processes.

Additional information 

• Vitamins are essential nutrients
• That your body requires in small amounts to function, grow, and develop properly.
• They are divided into two main groups:
• water-soluble (like Vitamin C and the B-vitamins)
• fat-soluble (like Vitamin A, D, E, and K)

Last updated by NA on 16-07-2026

Explanation

Let the original weight of the solution = x kg

Acid present in original solution = 92% of x = 0.92x kg

Water is added. Only water is added, so the amount of acid remains the same.

Final weight of solution = 40 kg  

Final concentration of acid = 84%  

Acid present in final solution = 84% of 40 = 0.84 x 40 = 33.6 kg

Since acid remains the same:  

0.92x = 33.6  

x = 33.6 / 0.92  

x = 36.52 kg (approx)

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