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Quizzes > High School Quizzes > Science

True or False Science Practice Quiz

Sharpen your skills with engaging science questions

Difficulty: Moderate
Grade: Grade 8
Study OutcomesCheat Sheet
Colorful paper art promoting a Science Fact or Fiction trivia quiz for students.

Humans use only 10% of their brain.
False
Only during sleep
True
Depends on the person
Neuroscience research shows that virtually every part of the brain has a specific function, debunking the myth that we use only 10% of it. This fact highlights the complexity and continuous activity of the brain in all aspects of life.
Lightning never strikes the same place twice.
True
False
Only in open areas
It depends on the location
Lightning can and does strike the same location repeatedly, especially in areas that are prone to thunderstorms. This myth likely arose from the unpredictable nature of lightning but is not supported by scientific evidence.
Bats are blind.
Only in certain species
True
Only at night
False
Despite the saying 'blind as a bat', bats have functional vision and rely heavily on echolocation to navigate in the dark. Their visual and auditory adaptations make them highly effective nocturnal creatures.
Sugar causes hyperactivity in children.
False
True
Only in large amounts
Only sugary drinks do
Scientific studies have shown that there is no direct link between sugar intake and hyperactivity in children. This myth may be reinforced by anecdotal observations, but controlled research does not support the claim.
Cracking your knuckles leads to arthritis.
Only if done excessively
False
Only in older adults
True
Research has found no conclusive evidence linking knuckle cracking to arthritis. The noise is primarily caused by the release of gas from the joints, and while it might irritate nearby people, it does not cause joint diseases.
Antibiotics are effective in treating viral infections.
False
True
Sometimes, if viruses are mild
Only in combination with antiviral drugs
Antibiotics are specifically designed to target bacterial infections and have no effect on viruses. Using them for viral infections not only is ineffective but also contributes to the rise of antibiotic-resistant bacteria.
A penny dropped from a tall building can be lethal.
True
It depends on the height
False
Only in rare cases
Due to air resistance and the aerodynamic properties of a penny, it does not gain enough speed to be lethal when dropped from a height. While it may hurt upon impact, it is unlikely to cause serious injury.
Humans can survive without water for a week.
True
Only in cool climates
False
Depends on physical activity
The human body requires regular hydration to maintain essential functions, and most people would not survive more than a few days without water. This fact underscores the critical role water plays in overall health.
Ice on a frozen lake is always safe to support heavy weights like cars.
Depends on the temperature
False
True
True if it's clear ice
Not all frozen lakes have uniformly thick or stable ice; safety depends on factors such as temperature fluctuations and local conditions. Assuming any ice is safe can lead to dangerous situations.
Bats are the only mammals capable of true flight.
Only some bats can
True
False
They are among several flying mammals
Bats have unique anatomical adaptations in their wings that allow them to achieve powered flight, unlike any other mammal. This fact distinguishes them as the sole group of mammals that can truly fly.
Goldfish have a memory span of only three seconds.
False
It varies widely among goldfish
Their memory is exactly three seconds
True
Studies have demonstrated that goldfish are capable of remembering events for months, not mere seconds. The three-second memory myth is a widespread misconception that underestimates their cognitive ability.
Ostriches bury their heads in the sand to hide from predators.
Only when they are scared
They do it to cool off
True
False
Ostriches do not actually bury their heads in the sand; instead, they sometimes lower their heads to the ground to check on their eggs or forage. This behavior has been misinterpreted as hiding rather than a practical action.
The ozone layer protects Earth from harmful ultraviolet radiation.
Only in polar regions
Only partially
True
False
The ozone layer is crucial in absorbing and blocking the majority of the Sun's harmful ultraviolet rays before they reach the Earth's surface. This protective barrier is essential for reducing UV-related health risks in living organisms.
Mice always love cheese.
Only when hungry
They prefer fruits to cheese
True
False
Although popular culture portrays mice as cheese lovers, studies indicate that they tend to prefer grains and fruits when given a choice. The assumption that mice are universally attracted to cheese is more of a stereotype than a fact.
Water conducts electricity due to the ions dissolved in it.
Only when mixed with salt
Only when it's hot
False
True
Water found in nature usually contains impurities that introduce ions, which facilitate electrical conductivity. While pure water is a poor conductor, the common presence of dissolved substances means that everyday water can carry an electrical current.
Does the Coriolis effect determine the direction water spirals down a drain in household sinks?
Only in the Northern Hemisphere
True
Only in circular sinks
False
The Coriolis effect, while influential on a large geographic scale such as in weather systems, is negligible in small-scale systems like household sinks. The direction in which water drains is primarily determined by the design of the sink and local water movement.
Can sound travel through the vacuum of space?
Only at low frequencies
True
False
Only if amplified
Sound waves require a medium such as air, water, or solids to propagate, and in the vacuum of space there are not enough particles to support sound transmission. This basic principle of physics confirms that sound cannot travel in space.
Can drinking excessive amounts of water lead to water intoxication?
Only during intense exercise
True
Only if the water is contaminated
False
Overconsumption of water can disrupt the balance of electrolytes in the body, leading to a condition known as hyponatremia. This condition, often called water intoxication, highlights that even water - a vital resource - can become dangerous when consumed in excessive amounts.
Is the greenhouse effect caused solely by human activities?
False
It depends on the region
Only in industrial areas
True
The greenhouse effect is a natural process that warms the Earth; human activities, such as burning fossil fuels, enhance this effect but are not its sole cause. Recognizing the natural and human-influenced aspects of the greenhouse effect is essential to understanding climate science.
Do all forms of renewable energy have zero environmental impact?
False
Only wind energy does
Only solar energy does
True
Although renewable energy sources are much cleaner than fossil fuels, they are not completely free from environmental impacts. Their production, installation, and maintenance can lead to habitat disruption and resource extraction, demonstrating that no energy source is entirely impact-free.
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Study Outcomes

  1. Analyze scientific statements to differentiate fact from fiction.
  2. Evaluate the accuracy of common scientific myths using evidence.
  3. Understand the application of key scientific concepts in everyday contexts.
  4. Apply critical thinking skills to assess and verify scientific claims.
  5. Demonstrate improved test preparation strategies through practice analysis.

True or False Science Cheat Sheet

  1. Bats Aren't Blind - Contrary to popular belief, bats have perfectly good eyesight, especially in low light, and echolocation simply adds extra precision when they hunt or navigate. Their sonar-like clicks bounce off objects, letting them "see" with sound. Learn more
  2. Goldfish Have Long Memories - Goldfish can remember things for months, not seconds! They can be trained to navigate mazes or press levers for food, proving that their brains are more capable than you might think. Dive into the research
  3. Cracking Knuckles ≠ Arthritis - That familiar pop comes from tiny gas bubbles collapsing in your joint fluid, not from bones rubbing together. Studies show no link between knuckle‑cracking and arthritis, though it can annoy your friends! Get the facts
  4. Lightning Can Strike Twice - Tall structures like skyscrapers, lightning rods, and even trees can get zapped over and over in a single storm. It's all about offering a convenient path for the electrical discharge. See why
  5. We Use More Than 10% of Our Brains - Neuroimaging lights up nearly every part of your brain throughout the day, even when you're just chilling on the couch. That "10%" claim is a myth born from misunderstanding neuroscience. Explore the evidence
  6. The Great Wall Isn't Visible from Space - Although it's impressively long, the wall is too narrow and its material blends into the terrain. Even astronauts rely on specific lighting and camera lenses to spot it. Find out more
  7. Shaving Doesn't Thicken Hair - After a shave, new hair grows with a blunt tip, which can feel coarser, but it's the same thickness as before. Your razor isn't secretly turning you into a woolly mammoth! Read on
  8. Red Doesn't Enrage Bulls - Bulls are color‑blind to red; they react to the movement of the matador's cape rather than its hue. It's all about the swish, not the shade. Learn why
  9. The Earth Is Round, Not Flat - Overwhelming evidence from physics, satellite imagery, and centuries of navigation confirms our planet's spherical shape. Flat‑Earth ideas don't hold up under scrutiny. Discover the proof
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