Tag: science & technology

Malaria primarily affects the spleen, causing it to enlarge (splenomegaly) as it filters out infected red blood cells. The Plasmodium parasite infects and destroys red blood cells, which the spleen then removes. While malaria affects the whole body, the spleen bears the brunt of the damage.

Most food digestion and nutrient absorption occurs in the small intestine, particularly the duodenum and jejunum. The stomach mainly breaks down proteins with acid and enzymes, while the large intestine primarily absorbs water and electrolytes. The liver produces bile but doesn't digest food directly.

Iron is a ferromagnetic material, meaning it is strongly attracted to magnets. This property is due to the alignment of magnetic domains within the metal when exposed to a magnetic field. This fundamental property of iron is why it's widely used in electromagnets and magnetic applications.

The focus is the point where parallel light rays (from infinity) converge after passing through a lens. This is a fundamental principle in geometric optics. The center is the middle of the lens, infinity is a theoretical distance, and parabola is a type of curve.

By definition, 1 calorie (small 'c') is the amount of heat energy required to raise the temperature of 1 gram of water by 1°C. This is different from a Calorie (capital 'C'), which equals 1000 calories and is used in nutrition.

The speed of sound in air at 25°C is approximately 346 m/s. Among the options, 330 m/s is the closest approximation. The speed of sound in air increases with temperature and is roughly 331 m/s at 0°C, increasing by about 0.6 m/s per degree Celsius.

The SI unit of electric current is Ampere (misspelled here as 'Amphere'). Farad measures capacitance, Ohm measures resistance, and Mho measures conductance.

A magnifying glass uses a convex lens, which is thicker at the center and converges light rays to create a magnified image. Concave lenses diverge light and make objects appear smaller.

The thin wire inside an electric bulb that glows when current passes through it is called the filament. It's typically made of tungsten due to its high melting point.

A gold leaf electroscope detects electric charge - when a charged object touches it, the gold leaves repel each other. Ammeters measure current, thermometers measure temperature.