1 Which electromagnetic wave carries the least energy? A Gamma rays B X-rays C Infrared rays D Radio waves
2 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
3 Overexposure to ultraviolet radiation may cause A Skin cancer B Hearing loss C Muscle pain D Heart disease
4 The dual nature of light means that light behaves as A Wave only B Particle only C Wave and particle D Energy only
5 Which factor increases the risk of electromagnetic radiation? A Low frequency B Short wavelength C Low energy D Long wavelength
7 Which electromagnetic radiation is used in cancer treatment? A Radio waves B Gamma rays C Infrared rays D Microwaves
8 Who discovered the atomic nucleus through the gold foil experiment? A J.J. Thomson B Ernest Rutherford C Niels Bohr D James Chadwick
10 The main source of energy of the Sun is: A Nuclear fission B Chemical reaction C Nuclear fusion D Radioactivity
13 Which electromagnetic waves are used in radar systems? A Radio waves B Microwaves C Infrared rays D X-rays
14 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
15 A scientific theory is falsifiable if it can be: A Proved true B Observed directly C Tested and proven false D Mathematically solved
17 Electromagnetic waves consist of oscillating A Electric and magnetic fields B Electric charges only C Magnetic poles only D Particles only
18 Half-life of a radioactive substance is the time required for: A All atoms to decay B Half of the atoms to decay C One atom to decay D Radiation to stop
20 Which device is used to detect radiation? A Thermometer B Galvanometer C Geiger-Muller counter D Voltmeter