True or False Quiz
Questions: 16 · 10 minutes
1. An ice cube floats in a glass filled below the rim. If the ice melts without evaporation or spilling, the water level stays essentially the same. Is this accurate?
True — the ice vanishes as heat and therefore adds no water to the glass.
False — melting always makes the level rise because solid water contains no liquid volume.
True — the floating ice already displaces an amount of water equal in weight to the ice.
False — the level falls sharply because liquid water weighs less than the same ice cube.
2. “All bats are blind and rely entirely on echolocation.” Which verdict and explanation are accurate?
True — bats lack functioning eyes because echolocation replaces vision completely.
False — bats use vision only as newborns and permanently lose it when they begin flying.
True — every bat species navigates exclusively by interpreting reflected sound.
False — bats can see, and species differ in how much they also use echolocation.
3. “The year 2100 will be a leap year because it is divisible by 4.” Which response is accurate?
False — a century year must be divisible by 400 to be a leap year, and 2100 is not.
False — leap years stop occurring after the year 2096.
True — divisibility by 4 is the only rule used to determine every leap year.
True — every year ending in 00 automatically includes February 29.
4. “Northern Hemisphere summer occurs mainly because Earth is closer to the Sun during that season.” Which response is correct?
True — Earth’s orbit brings every part of the planet closest to the Sun during northern summer.
True — shorter Earth-Sun distance causes the Sun to remain above the horizon longer.
False — Earth’s axial tilt gives the Northern Hemisphere more direct sunlight and longer days.
False — summer is produced by changes in the Sun’s yearly energy output rather than Earth’s position.
5. “Every square is a rectangle, but not every rectangle is a square.” Which explanation is correct?
False — squares cannot be rectangles because all four of their sides are equal.
True — rectangles and squares are unrelated shapes that happen to have four sides.
True — a square meets the rectangle definition, while a rectangle need not have four equal sides.
False — every rectangle must have four equal sides and four right angles.
6. “The number 2 is the only even prime number.” Which response is correct?
False — every even number is prime because it can be divided by 2.
True — 2 has only 1 and 2 as positive divisors, while every larger even number is divisible by 2.
False — the number 1 is also an even prime number.
True — 2 is prime because no positive integer can divide it evenly.
7. A fair coin lands heads five times in a row. “Tails is now more likely on the sixth toss.” Is this true or false?
True — the coin must compensate for the earlier heads to restore a balanced sequence.
False — after five heads, another head becomes more likely because a streak has formed.
True — five consecutive heads physically shift the coin’s balance toward tails.
False — independent tosses remain equally likely to produce heads or tails each time.
8. “Antibiotics generally cure the common cold by killing the virus that causes it.” Which verdict is accurate?
True — antibiotics destroy both bacteria and viruses by the same mechanism.
False — antibiotics do not help because common colds are caused by fungi.
True — cold viruses become bacteria once symptoms appear, allowing antibiotics to work.
False — common colds are caused by viruses, while antibiotics target bacteria rather than viruses.
9. “Lightning never strikes the same place twice.” Which verdict and explanation are accurate?
False — tall or exposed structures can be struck repeatedly, even during the same storm.
True — the first strike permanently removes the electrical charge from that location.
False — but a repeat strike can occur only if the storm reverses direction.
True — each new lightning channel must end on previously untouched ground.
10. “Sound can travel through a perfect vacuum if it is loud enough.” Which answer is correct?
False — sound is a mechanical vibration and needs particles in a medium to propagate.
False — only low-frequency sound can cross a vacuum, while high frequencies cannot.
True — sound travels through empty space in the same way that visible light does.
True — sufficient volume allows sound waves to create their own temporary medium.
11. At a high mountain campsite, water may boil below 100°C, and pasta can therefore take longer to cook. Is this accurate?
False — high altitude raises the boiling point and makes the water too hot for efficient cooking.
False — water always boils at exactly 100°C regardless of air pressure.
True — reduced oxygen directly prevents the pasta from absorbing hot water.
True — lower atmospheric pressure lowers water’s boiling point, so boiling water can be cooler.
12. A metal spoon and a wooden spoon have been in the same room overnight. The metal spoon can feel colder even when both are at the same temperature. Is this true?
False — objects that feel different must have different measured temperatures.
True — metal conducts heat away from your hand faster than wood, changing how cold it feels.
True — metal naturally maintains a temperature below the surrounding room air.
False — wood removes heat from skin faster because it contains tiny air spaces.
13. “Most of the dry mass gained by a growing tree comes from minerals drawn out of the soil.” Which verdict is correct?
False — much of the tree’s dry mass comes from carbon incorporated from atmospheric carbon dioxide.
True — roots convert soil minerals directly into most of the tree’s wood.
True — sunlight supplies energy but contributes the physical matter that forms nearly all wood.
False — tree mass is created from sunlight alone without incorporating matter from the environment.
14. “The Great Wall of China is clearly visible from the Moon with the unaided eye.” Which verdict is accurate?
True — any structure extending for thousands of kilometers is individually visible from the Moon.
False — despite its length, the wall is far too narrow to be distinguished unaided at lunar distance.
True — the wall is wide enough to appear as a continuous dark band across Asia.
False — reflected moonlight makes every human-built structure invisible from space.
15. An astronaut standing on the Moon has about one-sixth of their Earth mass. Is this true or false?
True — weaker lunar gravity removes most of the matter from the astronaut’s body.
False — the astronaut’s mass stays the same, although their weight is much lower.
True — mass and weight always decrease by the same amount when gravity weakens.
False — the astronaut’s mass increases because a spacesuit adds gravitational force.
16. “Mary Shelley began writing Frankenstein while she was still a teenager.” Which verdict is accurate?
False — she first drafted the novel after turning 30.
True — the finished novel was published while she was still 17.
True — she began the story at age 18 during the 1816 ghost-story challenge near Geneva.
False — the story existed before her lifetime and she only edited a later edition.