1 Which phenomenon proves the particle nature of light? A Diffraction B Interference C Photoelectric effect D Refraction
2 The energy of electromagnetic radiation depends upon its A Wavelength B Frequency C Speed D Amplitude
3 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
4 Which part of the spectrum is responsible for heating effect? A Ultraviolet B Infrared C X-rays D Gamma rays
5 Which electromagnetic waves are used in radar systems? A Radio waves B Microwaves C Infrared rays D X-rays
7 Which electromagnetic wave has the shortest wavelength? A X-rays B Ultraviolet rays C Gamma rays D Visible light
8 Electromagnetic waves do not require a medium because they are A Mechanical waves B Sound waves C Transverse waves D Longitudinal waves
9 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
10 Which electromagnetic waves can pass through human body easily? A Radio waves B X-rays C Microwaves D Infrared waves
11 Which electromagnetic wave is used in photography? A Radio waves B Visible light C X-rays D Gamma rays
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 Electromagnetic waves consist of oscillating A Electric and magnetic fields B Electric charges only C Magnetic poles only D Particles only
15 Which electromagnetic wave has the highest frequency? A Microwaves B Infrared rays C Visible light D Gamma rays
16 Which scattering is responsible for the blue color of the sky? A Mie scattering B Rayleigh scattering C Compton scattering D Photoelectric scattering
18 Light travels in straight lines in a medium due to A Reflection B Rectilinear propagation C Diffraction D Interference
19 Which electromagnetic wave is safest for human exposure? A Gamma rays B X-rays C Ultraviolet rays D Radio waves
20 Which electromagnetic waves are used for sterilizing medical equipment? A Infrared rays B Ultraviolet rays C Microwaves D Radio waves
21 Which radiation is most harmful to the human body? A Radio waves B Microwaves C Gamma rays D Infrared rays
22 Which electromagnetic radiation is used in cancer treatment? A Radio waves B Gamma rays C Infrared rays D Microwaves
23 The dual nature of light means that light behaves as A Wave only B Particle only C Wave and particle D Energy only
24 Which factor increases the risk of electromagnetic radiation? A Low frequency B Short wavelength C Low energy D Long wavelength