SCIENCE quiz
Here are sample questions from the SCIENCE category. Think about each answer before revealing it – and then check how you'd do against real players in the app.
Which two metals make up most of the Earth's core?
The old name for the core, "nife", comes from the symbols for nickel and iron (Ni, Fe). Its temperature is estimated at 5,500–6,500 °C. The outer core is liquid, while the inner core is solid and rotates slightly faster than the Earth's mantle.
What is the electrode through which electric current flows into a device, such as a vacuum tube, called?
In vacuum tubes the anode is the positive electrode. The name comes from the Greek "ana", up, and "hodos", way.
How is the letter "U" written in international Morse code?
••−
Is the inclined plane a simple machine?
- No
- Yes
Along with the lever, it is one of the two basic simple machines. It lets you lift a load with less force, but over a longer distance.
What is the unit of heredity that occupies a specific place on a chromosome called?
A gene's position on a chromosome is called its locus. Alleles are different versions of the same gene.
Who received the 2011 Nobel Prize in Chemistry for the discovery of quasicrystals?
The Israeli scientist discovered quasicrystals in 1982 but was ridiculed for years – Linus Pauling, among others, claimed they did not exist.
Is aluminum a dielectric?
- No
- Yes
No. Aluminum is a very good electrical conductor and is used, among other things, in high-voltage power lines.
What is the largest formal geochronological unit called?
It is divided into eras and lasts at least 500 million years. The name comes from the Greek "aiōn", meaning time or eternity.
What is the science of population, dealing with natural increase and migration, among other things, called?
The name comes from the Greek words "demos" (people) and "grapho" (I write). Demography also studies population structure, for example by age and sex.
What is the smallest mass of fissile material needed to sustain a chain reaction called?
At critical mass, each fission of a nucleus triggers exactly one further fission.
What is the smallest repeating fragment of a polymer molecule called?
The name comes from the Greek "meros", meaning part. A polymer molecule consists of a very long chain of mers.
What is the state of matter called that easily changes shape and takes the form of its container but hardly changes volume?
Who developed the psychological theory known as the hierarchy of needs?
Which is denser: water or ice?
That is why ice floats on water. Water is densest at about 4 °C.
What is the direct transition of a solid into a gas called?
Is the square root of 73 greater than 8?
- No
- Yes
The square root of 73 is 8.5440.
Does friction act in the direction of a body's motion or opposite to it?
Is 1911 a prime number?
- No
- Yes
No, it is divisible by 3, among others.
Arrange the letters of the Greek alphabet in ascending order.
- Alpha
- Beta
- Gamma
- Delta
What is the phenomenon in which warmer water freezes faster than cold water under certain conditions called?
Mpemba noticed that a heated ice cream mix froze faster than a cooled one.
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