Electromagnetic Waves Class 12 Physics Important Questions

Students can read the important questions given below for Electromagnetic Waves Class 12 Physics. All Electromagnetic Waves Class 12 Notes and questions with solutions have been prepared based on the latest syllabus and examination guidelines issued by CBSE, NCERT and KVS. You should read all notes provided by us and Class 12 Physics Important Questions provided for all chapters to get better marks in examinations. Physics Question Bank Class 12 is available on our website for free download in PDF.

Important Questions of Electromagnetic Waves Class 12

Question: which is the use of microwave? 
a) in treatment of cancer
b) to observe changing blood flow
c)used to kill microbes
d)studying details of atoms and molecule

Question: Which of the following is NOT an example of EM RAYS.     
I) Radiotherapy(medicine).
II) Checking fractures.
III) Sterilisation.
IV) Explosives.

Question: what is the use of rays lying beyond X ray region in electromagnetic spectrum       
a) used to kill microbes
b) used to detect heat loss in insulated systems
c) used in standard broadcast radio and television
d) used In oncology, to kill cancerous cells.

Question: The one which is not considered as naturally occurring greenhouse gas is           
(a) methane
(b) CFCs
(c) carbon dioxide
(d) nitrous oxide

Question: Identify the pair having highest frequency and highest wavelength EM WAVES.     
I) UV rays and X- rays
II) Gamma rays and Microwaves.
III) Gamma rays and Radio waves.
IV) Radio waves and UV rays.

Question: where do microwave fall in electromagnetic spectrum?       
a) between u.v region and infrared
b) between gamma and u.v
c)between infrared and radio wave
d)between gamma and infrared

Question: what is the source of gamma rays?         
a) radioactive decay of nucleus
b) accelerated motion of charges in conducting wire
c) hot bodies and molecule
d) klystron valve

Question: what is other use of gamma rays?         
a) used to change white topaz to blue topaz
b) used in aircraft navigation
c) used in kill microbes
d) checking fractures of bone

Question: What is the most common method of preparation of X rays ?         
a) magnetron valve
b) vibration of atoms and molecules
c) bombardment of metal by high energy electrons
d) radioactive decay of nucleus

Question: which of the following set of instrument /equipment can detect X- rays         
a) Photocells ,photographic film
b) Thermopiles ,bolometer
c) Photographic film ,Geiger tube
d) Geiger tube ,human eye

Question: where do X rays fall on the electromagnetic spectrum?     
a) Between UV region and infrared region
b) Between gamma rays and UV region
c) Between infrared and microwaves
d) Between microwaves and radio waves

Question: Which of the following is not a use of infrared waves           
a) Used in treatment for certain forms of cancer
b) in military and civilian applications include target acquisition, surveillance, night vision, homing, and tracking.
c) to observe changing blood flow in the skin
d) In imaging cameras, used to detect heat loss in insulated systems

Question: which of the following is the best method for production of infrared waves
a) bombardment of metal by high energy electrons               
b) radioactive decay of nucleus
c) magnetron valve
d) vibration of atoms and molecules

Question: how is wavelength of gamma rays         
a) low
b) high
c) infinite
d) zero

Question: choose the one with correct radiation order?               
a) alpha>beta>gamma
b) beta>alpha>gamma
c) gamma>beta>alpha
d) gamma>alpha>beta

Question: Wavelength of infrared radiations is       
(a) shorter
(b) longer
(c) infinite
(d) zero

Question: The classification is roughly based on?              
I) Wavelength and frequency of waves.
II) Production and detection of waves.                 
III) The way of travelling of waves.
IV) Year discovered.

Question: What physical quantity is the same for X rays of wavelength 10-10m, red light of wavelength 6800 Ao and radiowaves of wavelength 500m?     
I) Speed in vacuum (c)
II) frequency (f)
III) Scattering
IV) Energy (e)

Question: How are microwave produced?       
a) klystron and magnetron valve
b) sudden deceleration of electron in x- ray tube
c)accelerated motion of charge in conducting wire
d)hot bodies and molecules

Question: why microwave use for aircraft navigation?           
A) due to high wavelength
B) due to low wavelength
c) due to low frequency
d)due to their frequency modulation power