General Science

Virology is the branch of microbiology that studies viruses. Serology studies blood serum, pomology studies fruits, and urology deals with the urinary tract.

Salt water has higher density than pure water. The egg's density is between the two - it sinks in less dense pure water but floats in denser salt water due to buoyancy.

LPG (Liquefied Petroleum Gas) used for cooking is primarily a mixture of butane and propane. These hydrocarbons can be easily liquefied under pressure for storage and transport.

Chlorination is the most common method for purifying water for human consumption. Chlorine kills harmful microorganisms including bacteria and viruses, making water safe to drink.

To an astronaut in space, the sky appears black rather than blue. This is because there's no atmosphere to scatter sunlight and create the blue sky effect we see on Earth.

Sound travels as longitudinal waves where particles oscillate parallel to the direction of wave propagation. This creates regions of compression and rarefaction as the wave moves through a medium.

Antiseptics are substances that kill or inhibit the growth of microorganisms on living tissue. While they can prevent growth, their primary purpose is to kill harmful bacteria, fungi, and viruses.

The Tata Memorial Centre in Mumbai is one of India's premier cancer research and treatment institutes. While other cities have cancer facilities, Mumbai hosts the most prominent national-level institute.

Cheese is the most nutritious among these options as it contains complete proteins, calcium, fats, and various vitamins. Bread provides mainly carbohydrates, sugar is empty calories, and coffee has minimal nutritional value.

Earth is an oblate spheroid, meaning its poles are closer to the center than the equator. Since gravitational force depends on distance from Earth's center (F = GMm/r^2), the force is strongest where the distance is smallest - at the poles. At the equator, you're about 21 km farther from Earth's center.

Mercury has an unusually low melting point of approximately -39°C for a metal, which keeps it liquid at standard room temperature (20-25°C). This property results from its unique electron configuration and weak metallic bonding compared to other metals.

Flood prevention through vegetation works because plant roots hold soil in place, prevent erosion, and slow down water runoff. While both shrubs and trees on river banks help achieve this, shrubs generally have denser, more fibrous root systems that are particularly effective at binding soil particles together near the surface.

Sound is a mechanical wave that requires a medium to propagate - it travels by vibrating particles in solids, liquids, or gases. A vacuum has no particles to vibrate, so sound cannot travel through it. This is why sound cannot travel through space.

AB blood group is called the universal acceptor because individuals with AB blood have both A and B antigens on their red blood cells but no anti-A or anti-B antibodies in their plasma. This means they can receive blood from any group (A, B, AB, or O) without having an adverse reaction.

Neem trees are renowned for their air-purifying properties. They absorb various pollutants including carbon dioxide, sulfur dioxide, and nitrogen oxides from the air. Neem also releases abundant oxygen and has natural antimicrobial properties, making it exceptionally effective at improving air quality.

The ABO blood group system classifies human blood into four main types: A, B, AB, and O. These groups are determined by the presence or absence of A and B antigens on red blood cells. This is the primary and most well-known blood classification system used worldwide.

An adult human skeleton typically contains 206 bones. These include the skull, vertebral column, rib cage, and bones of the limbs. This number is standard for healthy adults, though babies are born with around 270 bones that fuse together during growth and development.

Normal human body temperature is approximately 98.4°F (37°C) when measured orally. This value represents the average baseline temperature for a healthy adult at rest. Individual variation exists, with temperatures ranging from about 97°F to 99°F considered normal.

Growing children require adequate protein intake because proteins are essential for building new tissues, muscle development, and overall growth. While vitamins, fats, and carbohydrates are all important for health, proteins are the primary building blocks needed for physical development during childhood.

Power is the rate at which work is done or energy is transferred. The SI unit of power is the Watt (W), named after James Watt. One Watt equals one Joule per second. Erg is a unit of energy, Dyne is a unit of force, and Ohm is a unit of electrical resistance.

Seawater contains approximately 3.5% salt by weight, which equals 35 grams per kilogram of seawater. This salinity level is consistent across most of Earth's oceans.

Alfred Nobel invented dynamite in 1867. The other options - railway engines, diesel engines, and motorcycles - were invented by different people during different time periods.