5.infrared waves is useful in which of the following application
a.remote control
b.screen of electronic devices
c.flourescence
d.medical treatment
6.it is the main source of ultraviolet radiation
a.star
b.sun
c.fluorescent lamp
d.incandescent lamp
7.which x-rays wavelength can penetrate the flesh but not the bones
a.long wavelength
b.short wavelength
c.longer frequency
d.shorter frequency
8.which color indicate regions of colder temperature
a.blue and green
b.blue and yellow
c.green and yellow
d.red and violet
9.which of the following in not an application of microwaves?
a.cooking
b.radar
c.satellite communication
d.sterilization of medical equipment
10.it is a continuim odlf electromagnetic waves arranged according to frequency and wavelength?
a.electragnetic radiation
b.electromagnetism
c.electromagnetic spectrum
d.electromagnetic waves​