Explanation

• Malaria is caused by the parasite Plasmodium.
• It is transmitted to humans through the bite of an infected female Anopheles mosquito.
• Malaria is a parasitic disease.
• It mainly affects the liver and red blood cells.
• Common symptoms include fever, chills, headache, and sweating.

Last verified on 11-07-2026

Explanation

• Sublimation is the process in which a solid directly changes into a gas without passing through a liquid phase.
• This endothermic phase transition
• Occurs when a substance absorbs enough energy to overcome intermolecular forces.
• Deposition: Gas to Solid (the reverse process).
• Examples: Dry ice, iodine, frost/snow.

Explanation

• An atom is the smallest possible particle of an element that can combine to form new compounds.
• Atoms are the building blocks of matter, and they cannot be broken down into smaller particles.

Last verified on 15-03-2026

Explanation

• The speed of sound is generally maximum in solids.
• Because their particles are closely packed and elastic forces transmit vibrations rapidly.

Additional information:

• Solids: Sound generally travels fastest, e.g., Steel: 5,000–6,000 m/s
• Liquids: Sound travels slower than in most solids, e.g., Water: 1,480 m/s
• Gases: Sound travels slowest under ordinary conditions, e.g., Air at 20°C: 343 m/s

Last verified on 15-10-2026

Explanation

• Aeroplanes fly in the troposphere.
• It is the lowest layer of the Earth's atmosphere.
• It extending up to about 12 km (7.5 miles) above the Earth's surface.
• The troposphere is where weather occurs, and it's the layer where aircraft operate.
• It typically cruising at altitudes between 30,000 to 40,000 feet (9,100 to 12,200 meters).

Additional information:

• Stratosphere: Contains the ozone layer.
• Mesosphere: Most meteors burn up here.
• Thermosphere: Includes much of the ionosphere and auroras.

Last verified on 12-10-2026