Explanation

• A seismograph is an instrument used to detect and record earthquakes.
• It consists of a mass attached to a fixed base
• During an earthquake, the base moves and the mass does not.

Last verified on 07-09-2026

Explanation

• The empirical formula of water is H₂O

• Freezing point: 0°C (32°F)
• Boiling point: 100°C
• Molar mass: 18.015 g/mol
• Density: 997 kg/m³
• Melting point: 0°C

Last updated by NA on 25-April-2026

Explanation

• The liver is the largest gland in the human body.
• It is situated in the right upper quadrant of the abdomen, beneath the diaphragm, and above the stomach.
• It is reddish-brown.
• It is weighs approximately 1.5 kg.

• The pineal gland is the smallest gland.
• It about the size of a grain of rice.
• It weighs approximately 150 mg.
• It is part of the endocrine system.

Explanation

• Neurons are the basic structural and functional units of the nervous system.
• They are specialized nerve cells.
• They transmit electrical and chemical signals.
• They control communication in the body.
• Brain, spinal cord, and nerves are made up of neurons.

Last verified on 08-06-2026

Explanation

• An apiary is a place where beehives are kept and honeybees are raised.
• It is used for beekeeping (apiculture) and honey production.
• A person who keeps and manages honeybees is called a beekeeper.

Additional information:

• Sericulture: Rearing silkworms for silk production.
• Apiculture: The practice of beekeeping.
• Butterfly house: A place where butterflies are kept.

Last verified on 09-10-2026

Explanation

• Comets are small celestial bodies mainly composed of ice, dust, and rocky material.
• They travel around the Sun in highly elliptical or elongated orbits.
• Halley’s Comet, which returns approximately every 76 years.

Additional information:

• Asteroids: Mainly rocky or metallic bodies.
• Meteoroids: Small pieces of rock or metal moving through space.

Last verified on 05-10-2026

Explanation

• Rear view mirrors in vehicles are convex mirrors.
• They give a wider field of view.
• Images formed are virtual, upright, and smaller.
• This helps drivers see more traffic behind them.
• It is a curved mirror that bulges outward.
• It is commonly used in side mirrors of cars, buses, and motorcycles.

Last verified 26-04-2026

Explanation

Explanation

• Afforestation is the process of planting trees in an area where there were no previous forests.
• It helps in combating climate change, preventing soil erosion, and improving biodiversity.

Last verified on 07-10-2026

Explanation

• Omar-Khayam was the first to develop the Binomial Theorem and determine binomial coefficients.

Additional information:

• Omar-Khayam was born in Iran in 1048 AD.
• He was a famous poet, mathematician, and astronomer.
• He introduced the Jalali Calendar.
• It is also known as the modern Solar Hijri calendar.

Last verified on 07-10-2026