Everyday Science MCQs

Competitive swimmers focus on reducing the friction (drag) between their body and the surrounding water by wearing specialized streamlined swimsuits, maintaining a hydrodynamic body position, and using efficient stroke techniques, all aimed at minimizing resistance from the water to move through it more efficiently.

A healthful, balanced diet is typically built on three core principles: balance (consuming the right proportions of different nutrient groups), variety (eating a wide range of different foods), and moderation (avoiding excessive consumption of any single food or nutrient, including those that are otherwise healthy).

Helium is used in balloons and airships because it is lighter than air and non-flammable. Hydrogen is lighter but highly flammable (Hindenburg disaster). Argon, Neon, and Xenon are noble gases but are heavier or less suitable for lifting. Helium is safe, inert, and provides the lift needed for balloons and airships.

Thorium is a naturally occurring radioactive element that also exhibits weak magnetic properties under certain conditions, making it one of the few elements noted for combining both magnetism and radioactivity, unlike common metals such as iron (which is magnetic but not radioactive) or aluminum (which is neither).

Terror financing jurisdiction is under the Financial Action Task Force (FATF). FATF establishes international standards for combating money laundering and terrorist financing. Countries with deficient anti-money laundering and counter-terrorist financing frameworks are placed on FATF's 'grey list' or 'black list.'

Optical fiber technology relies on the principle of total internal reflection, in which light traveling through the glass or plastic core of the fiber repeatedly reflects off the internal walls at angles steep enough to prevent it from escaping, allowing the light signal to travel long distances with minimal loss.

Animal science aims to improve all of these: animal breeding (genetics and reproduction), diseases (prevention and treatment), and nutrition (feed and diet). Animal science is a multidisciplinary field that studies the biology and management of domesticated animals for food production, research, and companionship.

Soap and detergent molecules have a unique structure with one end attracted to water and the other end attracted to grease and oil, which allows them to reduce the interfacial tension between water and dirt/oil particles on fabric, effectively lifting and surrounding the dirt so it can be rinsed away with water.

A Geiger counter (Geiger-Müller counter) is used to detect radioactivity. It detects ionizing radiation such as alpha, beta, and gamma particles. Polarimeters measure optical rotation, calorimeters measure heat, and Geiger counters are the standard tool for radiation detection in laboratories and field settings.

Approximately 31% of the Earth's land area is covered with forests. This represents about 4.06 billion hectares of forest. The percentage has been decreasing due to deforestation, land conversion, and climate change. The Amazon rainforest, Congo Basin, and Southeast Asian forests are the largest forest regions.