What is a black hole?
Anonymous Quiz
5%
A cold neutron star
73%
A region where escape velocity exceeds the speed of light
18%
An empty area between galaxies
5%
A planet with no atmosphere
❤2
What is the duplication of DNA before cell division called?
Anonymous Quiz
22%
Transcription
15%
Translation
57%
Replication
7%
Recombination
What gas makes up about 21% of Earth's atmosphere?
Anonymous Quiz
27%
Nitrogen
62%
Oxygen
5%
Argon
6%
Carbon dioxide
What is the function of white blood cells?
Anonymous Quiz
10%
Carry oxygen
78%
Defend the body against pathogens
9%
Clot the blood
3%
Produce hormones
What is the average Earth-Sun distance?
Anonymous Quiz
37%
150 million km
34%
380 000 km
17%
1 billion km
12%
57.9 million km
What does the Doppler effect describe?
Anonymous Quiz
67%
Frequency change due to relative velocity between source and observer
19%
Light refraction through a prism
8%
Sound diffraction around an obstacle
6%
Interference between coherent waves
What is an enzyme?
Anonymous Quiz
9%
A steroid hormone
82%
A protein that catalyses biochemical reactions
8%
A membrane lipid
1%
An energy nucleotide
❤1
Which of Galileo's observations contradicted the geocentric model?
Anonymous Quiz
32%
Phases of Venus and moons of Jupiter
31%
Chemical composition of the Sun
30%
Elliptical shape of orbits
8%
Expansion of the universe
What is mutualistic symbiosis?
Anonymous Quiz
22%
One organism parasitises the other
63%
Both organisms benefit
13%
One is neutral, the other benefits
3%
Competition between species
Which part of a neuron receives signals from other neurons?
Anonymous Quiz
29%
Axon
32%
Synapse
33%
Dendrite
6%
Myelin
Which law describes the force between two electric charges?
Anonymous Quiz
27%
Ohm's law
20%
Faraday's law
50%
Coulomb's law
3%
Ampere's law
What does the symbol 'K' represent in thermodynamics?
Anonymous Quiz
8%
Kilogram
71%
Kelvin
9%
Kilopascal
12%
Kilojoule
❤1
Which colour has the longest wavelength in the visible spectrum?
Anonymous Quiz
32%
Violet
17%
Green
10%
Orange
41%
Red
❤1
What does a barometer measure?
Anonymous Quiz
11%
Air temperature
64%
Atmospheric pressure
12%
Relative humidity
14%
Wind speed
Which cell produces antibodies?
Anonymous Quiz
28%
T lymphocyte
12%
Macrophage
56%
Plasma cell (B lymphocyte)
4%
NK cell
What are gravitational waves?
Anonymous Quiz
13%
Sound waves in space
67%
Ripples in spacetime caused by accelerating masses
7%
Radiation from black holes
14%
Solar magnetic field oscillations
❤1
Which vitamin is essential for blood clotting?
Anonymous Quiz
8%
Vitamin A
43%
Vitamin B12
8%
Vitamin C
41%
Vitamin K
Which scale measures locally felt earthquake intensity?
Anonymous Quiz
28%
Richter
18%
Mercalli scale
40%
Seismic barometer
14%
Seismoscope