[{"id":155366,"question":"Light waves are:","choices":[{"text":"Transverse wave","value":"A"},{"text":"Longitudinal wave","value":"B"},{"text":"Compressional wave","value":"C"},{"text":"None of them","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":155365,"question":"Light has:","choices":[{"text":"Wave nature","value":"A"},{"text":"Particle nature","value":"B"},{"text":"Dual nature","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":151109,"question":"In order to get interference using two light rays","choices":[{"text":"The sources should be monochromatic and coherent","value":"A"},{"text":"The sources should have the same frequency","value":"B"},{"text":"Superposition should be linear","value":"C"},{"text":"All of these","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":151108,"question":"The superposition of the two waves of same frequency and amplitude travelling in the same direction gives to an effect called","choices":[{"text":"Diffraction","value":"A"},{"text":"Interference","value":"B"},{"text":"Polarization","value":"C"},{"text":"Dispersion","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":151107,"question":"The locus of all points in a medium having same phase of vibration is called","choices":[{"text":"Crest","value":"A"},{"text":"Trough","value":"B"},{"text":"Wavelength","value":"C"},{"text":"Wave-front","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":151105,"question":"According to Huygen's principle","choices":[{"text":"light travels in straight line","value":"A"},{"text":"Light is a transvers wave","value":"B"},{"text":"Light has dual nature","value":"C"},{"text":"All points on the primary wave-front are the sources of secondary wavelets","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":151104,"question":"The cause of mirage observed in deserts in bright sunlight is due to","choices":[{"text":"Refraction of light","value":"A"},{"text":"Reflection of light","value":"B"},{"text":"Scattering of light","value":"C"},{"text":"Total internal reflection of light","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":151102,"question":"The velocity of light in vacuum can be changed by changing","choices":[{"text":"Frequency","value":"A"},{"text":"Amplitude","value":"B"},{"text":"Wavelength","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":151101,"question":"The image of the tip of a needle is never sharp because of","choices":[{"text":"Polarization of light","value":"A"},{"text":"Interference of light","value":"B"},{"text":"Diffraction of light","value":"C"},{"text":"Reflection of light","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":151100,"question":"Which one the following gives three regions of electromagnetic spectrum in order of increasing wavelength?","choices":[{"text":"Gamma rays, micro waves, visible light","value":"A"},{"text":"Radio waves, ultraviolet waves, X-rays","value":"B"},{"text":"Ultraviolet rays, infrared rays, micro waves","value":"C"},{"text":"Visible light, gamma rays, radio waves","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":151099,"question":"Huygen's theory cannot explain","choices":[{"text":"Diffraction","value":"A"},{"text":"Interference","value":"B"},{"text":"Polarization","value":"C"},{"text":"Photoelectric effect","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":151098,"question":"The contrast in the fringes in an interference pattern depends upon","choices":[{"text":"Fringe width","value":"A"},{"text":"Relative difference intensities of the two sources","value":"B"},{"text":"Distance between the slits","value":"C"},{"text":"Wavelength","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":151096,"question":"If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity","choices":[{"text":"Fringe width will decrease","value":"A"},{"text":"Fringe width will increase","value":"B"},{"text":"Fringe width will remain unchanged","value":"C"},{"text":"Fringe will become less intense","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":151094,"question":"Which one of the following phenomenon cannot be explained on the bases of Huygen's theory","choices":[{"text":"Refraction","value":"A"},{"text":"Reflection","value":"B"},{"text":"Diffraction","value":"C"},{"text":"Formation of spectrum","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":151092,"question":"Light appears to travel in straight line because","choices":[{"text":"It is not absorbed by the atmosphere","value":"A"},{"text":"It is refracted by the atmosphere","value":"B"},{"text":"Its wavelength is very small","value":"C"},{"text":"Its velocity is very large","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":151090,"question":"Stars twinkle due to","choices":[{"text":"The fact that they do not emit light continuously","value":"A"},{"text":"The refractive index of earth's atmosphere fluctuates","value":"B"},{"text":"The Star's atmosphere absorbs its light intermittently","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":151088,"question":"A prism splits a beam of white light into seven component colors. This is so because","choices":[{"text":"Phase of different colors is different","value":"A"},{"text":"Amplitude of different colors is different","value":"B"},{"text":"Wavelength of different colors is different","value":"C"},{"text":"Velocity of different colors is different","value":"D"},{"value":"E"}],"correctAnswer":4}]