What happens to the resistance of a filament lamp as the current through it increases?

It increases, because the filament heats up, giving an S-shaped I-V graph

Which is the key advantage of an electromagnet over a permanent magnet?

Its magnetism can be switched on and off, and its strength varied

In a transverse wave the vibrations are perpendicular to the direction of travel; in a longitudinal wave they are parallel

Radio, microwaves, infrared, visible, ultraviolet, X-rays, gamma

Irradiation is exposure to radiation from an outside source; contamination is radioactive material getting on or in you

10questions. Pick an answer and you'll see why right away.

In a series circuit, which quantity is the same at every point?
What happens to the resistance of a filament lamp as the current through it increases?
Which is the key advantage of an electromagnet over a permanent magnet?
What is the difference between a transverse and a longitudinal wave?
A wave has a frequency of 50 Hz and a wavelength of 6 m. What is its speed?
What is the correct order of the electromagnetic spectrum from lowest to highest frequency?
Which radiation is the most ionising but least penetrating?
When a nucleus emits an alpha particle, what happens to its atomic number?
A source has an activity of 800 Bq and a half-life of 5 hours. What is its activity after 15 hours?
What is the difference between irradiation and contamination?