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Who created the first version of the periodic table?
Einstein
Bohr
Newton
Mendeleev
What does the periodic table organize?
Foods
Cells
Machines
Elements
Which element is used in toothpaste?
Neon
Fluorine
Carbon
Helium
What is the chemical symbol for oxygen?
Oy
Om
O
Ox
Which element is found in table salt?
Calcium
Magnesium
Sodium
Potassium
When light hits a surface and bounces back in a predictable pattern, this phenomenon is called:
Transmission
Reflection
Absorption
Diffraction
According to the laws of reflection, the angle of incidence is always:
Unrelated
Less than the angle of reflection
Equal to the angle of reflection
Greater than the angle of reflection
Why does a straw appear bent when placed in water?
Optical illusion
The water warps the straw
The straw is flexible
Light changes speed and direction
Which best describes how light travels through different materials?
Fastest in water
Fastest in a vacuum
Same speed everywhere
Slowest in air
Diffuse reflection occurs when light hits:
Smooth surface
Rough surface
Transparent surface
Flat surface
What causes light to bend between materials?
Density changes
Temperature changes
Magnetic fields
Electrical charges
Normal in reflection refers to:
Typical path
Average light behavior
Imaginary line perpendicular to surface
Standard light measure
Refraction enables the creation of:
Blocks tech devices
Nothing practical
Underwater goggles only
Glasses, microscopes, cameras
When light hits a mirror, the rays and normal line:
Form triangle
Cancel out
Are random
Lie in same plane
The greater the change in light speed, the:
Light stops
Less bending
No change
More bending
What is the smallest unit of an element?
Molecule
Neutron
Atom
Proton
