2 Which electromagnetic waves are used in TV and radio broadcasting? A Infrared waves B Radio waves C X-rays D Ultraviolet rays
3 Which factor increases the risk of electromagnetic radiation? A Low frequency B Short wavelength C Low energy D Long wavelength
4 Why clouds appear white? A Due to absorption B Due to reflection of blue light C Due to scattering of all wavelengths D Due to refraction
5 Which electromagnetic waves are used in radar systems? A Radio waves B Microwaves C Infrared rays D X-rays
8 Electromagnetic waves consist of oscillating A Electric and magnetic fields B Electric charges only C Magnetic poles only D Particles only
9 Which electromagnetic waves are used for sterilizing medical equipment? A Infrared rays B Ultraviolet rays C Microwaves D Radio waves
11 Electromagnetic waves do not require a medium because they are A Mechanical waves B Sound waves C Transverse waves D Longitudinal waves
13 The nature of light includes A Only wave nature B Only particle nature C Both wave and particle nature D Neither wave nor particle nature
14 Visible light lies between which two regions of the electromagnetic spectrum? A Infrared and ultraviolet B Microwaves and infrared C X-rays and gamma rays D Radio waves and microwaves
15 Which electromagnetic waves can pass through human body easily? A Radio waves B X-rays C Microwaves D Infrared waves
16 Overexposure to ultraviolet radiation may cause A Skin cancer B Hearing loss C Muscle pain D Heart disease
17 Which electromagnetic wave has the highest frequency? A Microwaves B Infrared rays C Visible light D Gamma rays
18 The energy of electromagnetic radiation depends upon its A Wavelength B Frequency C Speed D Amplitude
19 Which electromagnetic wave carries the least energy? A Gamma rays B X-rays C Infrared rays D Radio waves
20 Which part of the spectrum is responsible for heating effect? A Ultraviolet B Infrared C X-rays D Gamma rays