CBSE Class 12 Physics Electromagnetic Waves MCQs Set C

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

Answer: D

Question. Which of the following is NOT an example of EM RAYS.     
(a) Radiotherapy(medicine) .
(b) Checking fractures.
(c) Sterilisation.
(d) Explosives.

Answer: D

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.

Answer: D

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

Answer: B

Question. Identify the pair having highest frequency and highest wavelength EM WAVES.     
(a) UV rays and X- rays
(b) Gamma rays and Microwaves.
(c) Gamma rays and Radio waves.
(d) Radio waves and UV rays.

Answer: C

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

Answer: C

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

Answer: A

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

Answer: A

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

Answer: C

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

Answer: C

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

Answer: B

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

Answer: A

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

Answer: D

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

Answer: B

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

Answer: C

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

Answer: B

Question. The classification is roughly based on?              
(a) Wavelength and frequency of waves.
(b) Production and detection of waves.                 
(c) The way of travelling of waves.
(d) Year discovered.

Answer: B

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?     
(a) Speed in vacuum (c)
(b) frequency (f)
(c) Scattering
(d) Energy (e)

Answer: A

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

Answer: A

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

Answer: B