Daily challenge · 22 October 2026
Science and nature
0 players took on this challenge.
Question 1
Which instrument is used to measure temperature?
- A Barometer
- B Thermometer
- C Compass
- D Anemometer
A thermometer measures temperature.
Question 2
What is the largest bone in the human body?
- A Femur
- B Tibia
- C Humerus
- D Pelvis
The femur, or thighbone, is the body's largest bone.
Question 3
Which instrument measures wind speed?
- A Hygrometer
- B Seismometer
- C Anemometer
- D Altimeter
An anemometer measures wind speed.
Question 4
Which scientist is best known for proposing the theory of continental drift?
- A Alfred Wegener
- B James Hutton
- C Louis Agassiz
- D Charles Lyell
Alfred Wegener argued that continents had once been joined and later drifted apart.
Question 5
Which scale ranks minerals by their resistance to scratching?
- A Beaufort scale
- B Mohs scale
- C Richter scale
- D Fujita scale
The Mohs scale compares minerals by scratch resistance.
Question 6
In what year did the Wright brothers make their first successful powered airplane flights?
- A 1899
- B 1903
- C 1908
- D 1912
Their first successful powered flights took place in 1903 at Kill Devil Hills, near Kitty Hawk, North Carolina.
Question 7
What is the atomic number of tungsten?
- A 42
- B 60
- C 74
- D 82
Tungsten, symbol W, has atomic number 74.
Question 8
Which two ancient Egyptian cities did Eratosthenes use in his estimate of Earth's circumference?
- A Memphis and Thebes
- B Alexandria and Syene
- C Giza and Heliopolis
- D Cairo and Abydos
Eratosthenes compared the Sun's angles at Alexandria and Syene (modern Aswan).
Question 9
What is the name for the point in an orbit where an object is closest to the Sun?
- A Aphelion
- B Perihelion
- C Perigee
- D Apogee
Perihelion is the point in an orbit closest to the Sun; aphelion is the farthest point.
Final question
What is the seismic boundary between Earth's solid inner core and liquid outer core called?
- A Mohorovičić discontinuity
- B Gutenberg discontinuity
- C Lehmann discontinuity
- D Conrad discontinuity
The Lehmann discontinuity marks the boundary between the liquid outer core and solid inner core.