[{"id":114634,"question":"The substance, which exists in two or more crystal forms under different conditions is called:","choices":[{"text":"Isomorphism Substance","value":"A"},{"text":"Allotropic substances","value":"B"},{"text":"True substances","value":"C"},{"text":"Polymorphous substances","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":114633,"question":"Two substances having the same crystal structure are called:","choices":[{"text":"Isomorphism","value":"A"},{"text":"Subtance","value":"B"},{"text":"Allotropic subtances","value":"C"},{"text":"Polymorphous substances","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":114632,"question":"A geometric shape of a solid obtained by regular, respetive, three-dimensional arrangements of its molecules,atoms or ions is called a:","choices":[{"text":"Crystal","value":"A"},{"text":"Crystal Lattice","value":"B"},{"text":"Crystal plane","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":114631,"question":"Which of the given pair have same dimension","choices":[{"text":"Stress, pressure","value":"A"},{"text":"Elastic modules, pressure","value":"B"},{"text":"Stress, elastic modules","value":"C"},{"text":"All have same dimension","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":114629,"question":"Which of the following strain are possible in solids","choices":[{"text":"Linear","value":"A"},{"text":"Volumetric","value":"B"},{"text":"Shear","value":"C"},{"text":"All of these","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":114627,"question":"Which of the following material have young and bulk modulus are same","choices":[{"text":"Brass","value":"A"},{"text":"Bone","value":"B"},{"text":"Aluminum","value":"C"},{"text":"Steel","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":114625,"question":"Which of the material have largest value of young's modulus","choices":[{"text":"Copper","value":"A"},{"text":"Diamond","value":"B"},{"text":"Aluminum","value":"C"},{"text":"Iron","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":114624,"question":"Glass and high carbon steel are","choices":[{"text":"Brittle substances","value":"A"},{"text":"Insulator","value":"B"},{"text":"Ductile substances","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":114622,"question":"__________ does not have linear strain","choices":[{"text":"Water","value":"A"},{"text":"Copper","value":"B"},{"text":"Aluminum","value":"C"},{"text":"Iron","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":114620,"question":"A material with high retentively and large corcivety most useful to make","choices":[{"text":"Electromagnet","value":"A"},{"text":"Permanent magnet","value":"B"},{"text":"Choke","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":114618,"question":"Such substance which break soon after crossing the elastic limit is called","choices":[{"text":"Weak substance","value":"A"},{"text":"Ductile substance","value":"B"},{"text":"Brittle substance","value":"C"},{"text":"Organic substance","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":114550,"question":"The property of light which does not change with the nature of the medium is","choices":[{"text":"Frequency","value":"A"},{"text":"Amplitude","value":"B"},{"text":"Wavelength","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":114548,"question":"A line which represents the direction of travel of a wave is known as","choices":[{"text":"Wave front","value":"A"},{"text":"Locus","value":"B"},{"text":"Ray of light","value":"C"},{"text":"Either b and c","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":114546,"question":"The speed of the secondary wavelets as mentioned in Huygen's principle is ________ the speed of propagation of the wave itself","choices":[{"text":"Equal to","value":"A"},{"text":"Greater than","value":"B"},{"text":"Smaller than","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":114544,"question":"Speed of light in vacuum is","choices":[{"text":"0 ms<sup>-1</sup>","value":"A"},{"text":"3 x 10<sup>8</sup>ms<sup>-1</sup>","value":"B"},{"text":"1.5 x 10<sup>8</sup>ms<sup>-1</sup>","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":114542,"question":"Angle between ray of light and the corresponding wave front is","choices":[{"text":"10<span style=\"color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;\">°</span>","value":"A"},{"text":"60<span style=\"color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;\">°</span>","value":"B"},{"text":"90<span style=\"color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;\">°</span>","value":"C"},{"text":"120<span style=\"color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;\">°</span>","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":114541,"question":"Monochromatic light directly means waves of","choices":[{"text":"Same frequency","value":"A"},{"text":"Same color","value":"B"},{"text":"Same wavelength","value":"C"},{"text":"All of them","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":114538,"question":"Wavelength of red color as compared to that of violet color is","choices":[{"text":"Smaller","value":"A"},{"text":"Longer","value":"B"},{"text":"Equal","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":114536,"question":"Which one of the following can act approximately as a source of monochromatic light","choices":[{"text":"Neon lamp","value":"A"},{"text":"Fluorescent tube","value":"B"},{"text":"Sodium lamp","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":114534,"question":"Wavelength of light, on the average, is given by","choices":[{"text":"10<sup>-14</sup>m","value":"A"},{"text":"10<sup>-10</sup>m","value":"B"},{"text":"10<sup>-6</sup>m","value":"C"},{"text":"10<sup>-4</sup>m","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":114529,"question":"Light waves are","choices":[{"text":"Transverse waves","value":"A"},{"text":"Longitudinal waves","value":"B"},{"text":"Compressional wave","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":114528,"question":"When observed by transmitted light, the central band of newton's ring system consists of:","choices":[{"text":"Bright circular ring","value":"A"},{"text":"Dark circular ring","value":"B"},{"text":"May be bright or dark circular ring","value":"C"},{"text":"No interference bands","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":114525,"question":"One angstrom equal:","choices":[{"text":"10<sup>-8</sup>m","value":"A"},{"text":"10<sup>-9</sup>m","value":"B"},{"text":"10<sup>-10</sup>m","value":"C"},{"text":"10<sup>-11</sup>m","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":114524,"question":"Confining the light vibrations in one plane is called:","choices":[{"text":"Reflection of light","value":"A"},{"text":"Interference of light","value":"B"},{"text":"Polarization of light","value":"C"},{"text":"Diffraction of light","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":114522,"question":"The most common method to obtain plane polarized light by using dichoric substance is:","choices":[{"text":"Selective absorption","value":"A"},{"text":"Reflection from different surfaces","value":"B"},{"text":"Refraction from different surfaces","value":"C"},{"text":"Scattering","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":114520,"question":"Which one of the following is an optically active substance?","choices":[{"text":"Quartz crystal","value":"A"},{"text":"Calcite crystal","value":"B"},{"text":"Sugar solution","value":"C"},{"text":"All of these","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":114518,"question":"A polaroid is:","choices":[{"text":"An adjustable shutter","value":"A"},{"text":"A device used to analyze polarized light","value":"B"},{"text":"A device used in polarimeter","value":"C"},{"text":"A light filter","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":114516,"question":"The wavefront formed at very large distance from the source is:","choices":[{"text":"Cylindrical","value":"A"},{"text":"Spherical","value":"B"},{"text":"Elliptical","value":"C"},{"text":"Plane","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":114514,"question":"The blue color of sky is due to:","choices":[{"text":"Dispersion","value":"A"},{"text":"Diffraction","value":"B"},{"text":"Polarization","value":"C"},{"text":"Scattering","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":114513,"question":"Plane polarized light can be produced by:","choices":[{"text":"Simple reflection","value":"A"},{"text":"Refraction","value":"B"},{"text":"Selective absorption","value":"C"},{"text":"All of these","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":114510,"question":"Sunset makes sky appears reddish because of:","choices":[{"text":"Diffraction of sun rays","value":"A"},{"text":"Refraction of light","value":"B"},{"text":"Scattering of light from dust particles","value":"C"},{"text":"Polarization of ligth","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":114508,"question":"If 5000 lines/cm are ruled on a diffraction grating, the element is:","choices":[{"text":"5 x 10<sup>-5</sup>m","value":"A"},{"text":"2 x 10<sup>-6</sup>m","value":"B"},{"text":"5 x 10<sup>-6</sup>m","value":"C"},{"text":"2 x 10<sup>-5</sup>m","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":114505,"question":"For a monochromatic light passing from air to glass, which one of the following statement is true?","choices":[{"text":"Frequency and wavelength decreases","value":"A"},{"text":"Frequency increases and wavelength decreases","value":"B"},{"text":"Frequency stays same, wavelength increases","value":"C"},{"text":"Frequency stays the same, wavelength decreases","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":114502,"question":"When a ray of light enters a denser medium from a rarer medium,its:","choices":[{"text":"Wavelength increases","value":"A"},{"text":"Velocity increases","value":"B"},{"text":"Frequency decreases","value":"C"},{"text":"Wavelength decreases","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":114500,"question":"A ray of light reflected from a dense medium under goes a phase change of:","choices":[{"text":"30<span style=\"color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;\">°</span>","value":"A"},{"text":"60<span style=\"color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;\">°</span>","value":"B"},{"text":"90<span style=\"color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;\">°</span>","value":"C"},{"text":"180<span style=\"color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;\">°</span>","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":114499,"question":"A thin layer of oil on the surface of water looks colored due to:","choices":[{"text":"Diffraction of light","value":"A"},{"text":"Reflection of light","value":"B"},{"text":"Dispersion of light","value":"C"},{"text":"Interference effect of light","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":114497,"question":"When crest of one wave falls on the crest of the other wave. This phenomenon is known as:","choices":[{"text":"Destructive interference","value":"A"},{"text":"Diffraction","value":"B"},{"text":"Polarization","value":"C"},{"text":"Constructive interference","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":114494,"question":"The medium in which speed of light is the same in all directions is called:","choices":[{"text":"Homogeneous","value":"A"},{"text":"Heterogeneous","value":"B"},{"text":"Non-homogeneous","value":"C"},{"text":"Free space","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":114492,"question":"A point source in a homogeneous medium gives rise to:","choices":[{"text":"A plane wavefront","value":"A"},{"text":"A spherical wavefront","value":"B"},{"text":"A cylindrical wavefront","value":"C"},{"text":"An elliptical wavefront","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":114491,"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}]