General Science & Technology Knowledge

HIV symptoms are highly variable and can appear at very different times depending on the individual. Some develop Acute HIV Syndrome within weeks of infection (option A), others may show symptoms within a year (option B), while some may remain asymptomatic for 10 or more years (option C). Since all timelines are possible, option D 'any of the above' is correct.

Relative humidity is the ratio of current water vapor in the air to the maximum amount the air can hold at that temperature. When it rains, the air is fully saturated with water vapor, meaning relative humidity reaches 100%.

Graphite has a layered molecular structure where weak van der Waals forces between layers allow them to slide easily over each other. This makes graphite an excellent solid lubricant, especially in high-temperature applications where liquid lubricants would degrade. Silica, diamond, and iron oxide do not have this layered structure.

Detergents contain synthetic surfactants, primarily sodium alkylbenzene sulfonates (sulphonates), which are highly effective at cleaning in both hard and soft water. Nitrates, bicarbonates, and bismuthates do not serve as the primary active cleaning agents in detergents.

Uranium-lead dating has a very long half-life and is the primary radiometric dating method used to estimate the age of the most ancient geological formations and rocks on Earth. Other methods like C-14 are used for much younger organic materials.

Camels are specially adapted to survive in desert conditions with limited water access. They can survive for long periods without drinking water and can tolerate significant dehydration - up to 30% of their body weight. Their blood cells are oval-shaped and can expand when they drink large amounts of water.

Red blood cells (erythrocytes) are the smallest cells in the human body, measuring about 6-8 micrometers in diameter. They are responsible for carrying oxygen throughout the body. Their small size allows them to pass through the tiniest blood vessels (capillaries) to deliver oxygen to tissues.

Aluminium is the most abundant metal in the Earth's crust, making up about 8% of its weight. It is the third most abundant element overall, after oxygen and silicon. Aluminium is lightweight, corrosion-resistant, and widely used in construction, packaging, transportation, and many other industries due to its favorable properties.

Eucalyptus is indeed one of the fastest-growing trees in the world, with some species capable of growing 6-10 feet per year under optimal conditions. This rapid growth rate makes it preferred for commercial plantations and biomass production compared to slower-growing trees like coconut or mango.

Voltas, Titan Industries, and TCS (Tata Consultancy Services) are all part of the Tata Group conglomerate. Infosys is an independent IT services company founded separately and not affiliated with the Tata group, making it the clear odd one out in this list.

Kilogram is the only unit of mass in this list. Newton, dyne, and pound-force are all units of force. The kilogram measures the amount of matter in an object, whereas the other three measure the force applied to an object, making it fundamentally different from the rest.

The Mobira Senator was introduced in 1982 as Nokia's first mobile phone. It was designed for use in cars and operated on the NMT (Nordic Mobile Telephone) network, which was an early analog mobile standard. This phone was not portable and had to be installed in vehicles.

Gold, palladium, silver, and platinum are all noble metals - highly resistant to corrosion and oxidation. Copper is a base metal that tarnishes and corrodes more readily. Copper is also significantly more reactive and has different chemical properties compared to the noble metals listed.

The Nokia 1011, launched in 1992, was Nokia's first digital mobile phone to use the GSM (Global System for Mobile Communications) network. GSM was the first digital standard for mobile phones, replacing earlier analog systems like NMT. The 1011 could store 99 phone numbers and had a monochrome display.

The Nokia 101 was indeed one of Nokia's earliest candy bar shaped phones. The candy bar form factor refers to phones with a rectangular, slab-like shape without any flip or slide mechanism. Nokia became famous for this simple, durable design in their early mobile phones.