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Science Quiz Worksheet

QUIZLINO
Set 1 · Mixed
Name:Class / Group:Score:     / 20

Choose the best answer for each question. The answer key is on the last page.

  1. What type of wave does not require a medium to travel?
    A. Sound Wave B. Water Wave C. Electromagnetic Wave D. Seismic Wave
  2. Which gas is filled inside electric bulbs?
    A. Oxygen B. Nitrogen C. Argon D. Hydrogen
  3. What is the formula for calculating speed?
    A. Speed = Time ÷ Distance B. Speed = Distance ÷ Time C. Speed = Distance × Time D. Speed = Time × Distance
  4. Which element has the symbol "Fe" on the periodic table?
    A. Fluorine B. Iron C. Fermium D. Francium
  5. How many bones are there in the adult human body?
    A. 206 B. 208 C. 212 D. 210
  6. What is the chemical symbol for Oxygen?
    A. O B. Ox C. O2 D. Og
  7. What do we call a substance that speeds up a chemical reaction without being consumed?
    A. Catalyst B. Solvent C. Reactant D. Acid
  8. Which gas is known as laughing gas?
    A. Nitrogen B. Nitrous Oxide C. Carbon Dioxide D. Helium
  9. What do we call the study of earthquakes?
    A. Meteorology B. Geology C. Seismology D. Oceanography
  10. What do we call the point inside the Earth where an earthquake originates?
    A. Epicentre B. Focus (Hypocentre) C. Fault Line D. Seismic Zone
  11. What is the name of the layer of gases surrounding the Earth?
    A. Hydrosphere B. Biosphere C. Atmosphere D. Lithosphere
  12. What is the water cycle also known as?
    A. Carbon Cycle B. Nitrogen Cycle C. Hydrological Cycle D. Rock Cycle
  13. Which organelle is known as the control center of a cell?
    A. Ribosome B. Mitochondria C. Nucleus D. Vacuole
  14. Which element is the hardest natural substance on Earth?
    A. Iron B. Carbon (Diamond) C. Gold D. Platinum
  15. Which organ is used for breathing?
    A. Stomach B. Liver C. Lungs D. Heart
  16. What state of matter is liquid water?
    A. Solid B. Liquid C. Gas D. Plasma
  17. Which quantum number determines the shape of an atomic orbital?
    A. Principal quantum number B. Azimuthal quantum number C. Magnetic quantum number D. Spin quantum number
  18. Which law explains the relationship between pressure and volume of a gas at constant temperature?
    A. Charles's Law B. Boyle's Law C. Ohm's Law D. Newton's Law
  19. What is measured in decibels (dB)?
    A. Temperature B. Pressure C. Sound Intensity D. Voltage
  20. What type of lens is used in magnifying glasses?
    A. Concave B. Cylindrical C. Bifocal D. Convex
Free printable worksheet from quizlino.com · Play this topic online: quizlino.com/category.php?id=2

Answer key – Science (Set 1)

  1. C. Electromagnetic Wave – Electromagnetic waves do not need a medium to travel, so they can cross the vacuum of space. They include radio waves, microwaves, infrared, visible light, ultraviolet, X-rays and gamma rays. James Clerk Maxwell predicted these waves in the 1860s, and Heinrich Hertz proved they exist in 1887.
  2. C. Argon – Electric bulbs are usually filled with argon, often mixed with a little nitrogen. Argon is an inert gas, so it does not react with the hot tungsten filament. Without it, the filament would burn up quickly in oxygen. Modern LED bulbs do not need a filament or gas at all.
  3. B. Speed = Distance ÷ Time – Speed equals distance divided by time. For example, a car that travels 120 km in 2 hours has an average speed of 60 km/h. Speed tells us how fast something moves; velocity is speed in a particular direction. The SI unit of speed is metres per second (m/s).
  4. B. Iron – Fe is the symbol for iron, from its Latin name 'ferrum'. Iron is the most common element on Earth by mass, because most of Earth's core is iron. It is the main ingredient of steel, and in our bodies it is needed for haemoglobin, which carries oxygen in the blood.
  5. A. 206 – An adult human has 206 bones. Babies are born with about 300 bones and cartilage pieces, and many fuse together as they grow, for example in the skull and the lower spine. The hands and feet alone contain more than half of all the body's bones.
  6. A. O – O is the chemical symbol for oxygen, element number 8. Oxygen is the most abundant element in Earth's crust and makes up about 21% of the air. Joseph Priestley and Carl Scheele discovered it independently in the 1770s, and Antoine Lavoisier gave it its name.
  7. A. Catalyst – A catalyst speeds up a chemical reaction without being used up itself. It works by giving the reaction an easier path that needs less energy. Enzymes are natural catalysts in our bodies, and car catalytic converters use platinum to turn harmful exhaust gases into safer ones.
  8. B. Nitrous Oxide – Nitrous oxide (N₂O) is called laughing gas because breathing it can make people feel happy and giggly. Joseph Priestley first made it in 1772. Dentists and doctors use it as a mild anaesthetic and painkiller. It is also a powerful greenhouse gas.
  9. C. Seismology – Seismology is the scientific study of earthquakes and the waves they send through the Earth. Seismologists use instruments called seismographs to record these waves. By studying how the waves travel, they discovered Earth's layers, including the liquid outer core.
  10. B. Focus (Hypocentre) – The focus, or hypocentre, is the point inside the Earth where an earthquake starts, where rocks first break and slip. It can be just a few kilometres deep or more than 600 km down. Shallow earthquakes usually cause more damage at the surface than deep ones.
  11. C. Atmosphere – The atmosphere is the layer of gases surrounding the Earth, held in place by gravity. It contains the oxygen we breathe, protects us from harmful ultraviolet rays and burning meteors, and keeps the planet warm enough for life. It has five main layers, starting with the troposphere where weather happens.
  12. C. Hydrological Cycle – The water cycle is also called the hydrological cycle. Water evaporates from oceans and lakes, condenses into clouds, falls as rain or snow, and flows back through rivers and groundwater. The Sun's energy drives the cycle, and the same water has been recycled for billions of years.
  13. C. Nucleus – The nucleus is called the control centre of the cell. It holds the cell's DNA, packed into chromosomes, and controls growth, metabolism and reproduction by deciding which proteins are made. It is surrounded by a double membrane with pores. Mature human red blood cells have no nucleus.
  14. B. Carbon (Diamond) – Diamond, a form of carbon, is the hardest natural substance. Each carbon atom is strongly bonded to four others in a rigid 3D network. Graphite in pencils is also pure carbon, but its atoms are arranged in sheets that slide over each other, which makes it soft.
  15. C. Lungs – We breathe with our lungs. Air travels down the windpipe into millions of tiny air sacs called alveoli, where oxygen passes into the blood and carbon dioxide passes out. The diaphragm, a dome-shaped muscle below the lungs, does most of the work of breathing.
  16. B. Liquid – Liquid water is water in its liquid state, between 0°C and 100°C at normal pressure. A liquid has a fixed volume but takes the shape of its container. Earth is the only planet known to have large amounts of liquid water on its surface, which is key to life.
  17. B. Azimuthal quantum number – The azimuthal, or angular momentum, quantum number (l) decides the shape of an atomic orbital. l = 0 gives a spherical s orbital, l = 1 a dumbbell-shaped p orbital, l = 2 a d orbital and l = 3 an f orbital. The principal quantum number (n), by contrast, decides the orbital's size and energy level.
  18. B. Boyle's Law – Boyle's law says that at constant temperature the pressure of a fixed amount of gas is inversely proportional to its volume (PV = constant). If you squeeze a gas into half the space, its pressure doubles. Robert Boyle published this in 1662; it explains how syringes and our lungs work.
  19. C. Sound Intensity – Decibels (dB) measure sound intensity, or loudness. The scale is logarithmic: every 10 dB increase means ten times more sound intensity. Normal conversation is about 60 dB, while a rock concert can reach about 110 dB. Long exposure above about 85 dB can damage hearing.
  20. D. Convex – Magnifying glasses use a convex lens, which is thicker in the middle than at the edges. It bends light rays inwards, so an object held close to it looks larger. Convex lenses are also used in cameras, microscopes and spectacles for long-sighted people.