General Science Quiz

Zr is the chemical symbol for Zirconium, a transition metal. Zinc is Zn, and 'Zeerium' and 'Zincrome' are not real elements. Chemical symbols are standardized internationally.

Toxicology is the study of poisons, their effects, and treatments. Botany studies plants, paleontology studies fossils, and virology studies viruses. The word 'toxic' relates to poisons.

The chemical formula for common salt (sodium chloride) is NaCl, consisting of one sodium and one chlorine atom. Na2Cl is incorrect, CoSa is not a valid formula, and NaOH is sodium hydroxide (lye).

Refraction is the scientific term for the change in direction (deviation) of a light wave as it passes from one transparent medium into another with a different density.

A generator is correctly identified as the machine that converts mechanical energy into electrical energy through electromagnetic induction. When mechanical energy (from steam, wind, water, or engines) rotates coils within a magnetic field, electricity is produced. A reactor typically refers to nuclear equipment, while an invertor does the opposite (DC to AC conversion).

Kalpana Chawla is correctly identified as the first Indian woman in space. She flew on Space Shuttle Columbia mission STS-87 in 1997 as a mission specialist. Although she was a US citizen born in India, she is recognized as the first woman of Indian origin in space. Sunita Williams later became the second Indian-American woman in space.

Saturn is correctly identified as the second biggest planet in our solar system. Jupiter is the largest, followed by Saturn at approximately 95 times Earth's mass. Saturn is famous for its prominent ring system and is a gas giant composed mostly of hydrogen and helium, making it the second-largest by both mass and volume.

False is correct - no human beings have ever set foot on Mars. All Mars exploration so far has been through robotic missions like rovers and landers. The Apollo missions (1969-1972) only landed humans on the Moon. Crewed Mars missions remain a future goal for space agencies like NASA and private companies like SpaceX.

Ohms is correctly identified as the unit of electrical resistance, named after Georg Ohm who formulated Ohm's Law (V=IR). Newton measures force, Mhos (now called Siemens) measures conductance (the inverse of resistance), and Cadila is not a physical unit. Resistance is fundamental to electrical circuits and determines how much a material opposes current flow.

A magnifying glass uses a convex lens, which is thicker in the middle than at the edges. This shape causes light rays to converge (bend inward), creating a magnified virtual image. Concave lenses are thinner in the middle and diverge light, making objects appear smaller.

A solar eclipse occurs when the moon passes directly between the sun and earth, blocking sunlight from reaching earth. The moon's shadow falls on earth's surface, temporarily darkening the sky. In a lunar eclipse, earth is between the sun and moon.

Sound is produced by the vibration of air molecules or any medium. These vibrations create pressure waves that our ears detect as sound. 'Photons of sound' is incorrect - photons are particles of light, not sound. Loudness is measured in decibels, not bels, making option C inaccurate.

Wavelength is defined as the distance between two consecutive crests or troughs of a wave. It represents the spatial period of the wave. Loudness is related to amplitude, frequency is the number of wave cycles per second, and amplitude is the maximum displacement from equilibrium.

Frequency is measured in both hertz and cycles per second - these are equivalent units. One hertz equals one cycle per second. This is a case where both naming conventions are valid and used interchangeably in physics.

Normal conversation typically measures around 60 decibels. 100 dB would be extremely loud (like a chainsaw or motorcycle), 50 dB is quieter than normal speech, and 80 dB is closer to heavy traffic or a noisy restaurant. The 60 dB range accurately represents typical human conversation levels.

Sound travels at approximately 343 meters per second in air at room temperature. For lightning striking 1 kilometer away, it takes approximately 3 seconds (1000 meters / 343 m/s ≈ 2.92 seconds) for the thunder to reach the observer. The 5-second rule is a common approximation where every 5 seconds equals approximately 1 mile.

Sounds with frequencies higher than 20,000 hertz are called ultrasonic. This is above the upper limit of human hearing. Infrasonic refers to sounds below 20 Hz, supersonic refers to objects moving faster than the speed of sound, and sonic boom is the shockwave created when an object breaks the sound barrier.

Vitamin D deficiency causes rickets, a condition where bones become soft and weak, especially in growing children. Colour blindness is genetic, wickets is a cricket term unrelated to nutrition, and nausea is a symptom not a deficiency syndrome.

Vitamin B12 deficiency causes megaloblastic anemia, where the body produces abnormally large red blood cells that can't function properly. Paralysis is not a direct result, spoon shaped nails indicate iron deficiency, and malaria is an infectious disease.

Vitamin A deficiency causes night blindness (difficulty seeing in low light conditions) and can lead to complete blindness if untreated. Colour blindness is a genetic condition, short sightedness is a refractive error, and myophia is not a recognized medical term.