Science GK questions from RRB NTPC, SSC, and other Exams
Science GK questions from RRB NTPC, SSC, and other Exams
1. Filament of a bulb is made of - Tungsten
Tungsten is used for bulb filaments due to its extremely high melting point (3422°C) and durability, allowing it to glow brightly without melting quickly.
2. Total number of bones in human body – 206
The adult human skeleton has 206 bones, providing structure, support, protection to organs, and facilitating movement along with muscles and joints.
3. Energy from the Sun comes from - Nuclear Fusion
The Sun produces energy through nuclear fusion, combining hydrogen nuclei into helium, releasing massive energy in the form of light and heat.
4. Gas that controls heartbeat – Oxygen
Oxygen supports heart function by supplying blood with sufficient oxygen for cardiac muscles. (Note: Actually, heartbeat is controlled by the sinoatrial node, not a gas.)
5. Red color of blood – Hemoglobin
Hemoglobin, an iron-containing protein in red blood cells, binds oxygen and gives blood its characteristic red color, enabling oxygen transport throughout the body.
6. Chemical formula of water - H₂O
Water consists of two hydrogen atoms and one oxygen atom (H₂O), a polar molecule essential for life, chemical reactions, and maintaining homeostasis.
7. Ozone layer protects Earth from - Ultraviolet (UV) rays
The ozone layer absorbs harmful UV radiation from the Sun, preventing skin damage, eye problems, and protecting ecosystems on Earth.
8. Discovery of DNA - Watson and Crick
James Watson and Francis Crick discovered the double helix structure of DNA in 1953, explaining how genetic information is stored and transmitted.