[{"id":121212,"question":"The minimum number of lenses used in compound microscope is","choices":[{"text":"1","value":"A"},{"text":"2","value":"B"},{"text":"3","value":"C"},{"text":"4","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":121211,"question":"The transmitter in optical fiber system contains a device called","choices":[{"text":"LED","value":"A"},{"text":"Diode","value":"B"},{"text":"Transistor","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":121209,"question":"Analyzer is use to","choices":[{"text":"Polarize the light","value":"A"},{"text":"Un-polarize the light","value":"B"},{"text":"Check whether the light is polarized or un polarized","value":"C"},{"text":"Rotate the plane of polarized light","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":121208,"question":"For total internal reflection to take place, the angle of incidence must be ______ than critical angle and the light should travel from ______ to ______ medium","choices":[{"text":"Greater, rarer, denser","value":"A"},{"text":"Smaller, rarer, denser","value":"B"},{"text":"Smaller, denser, rarer","value":"C"},{"text":"Greater, denser, rarer","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":121204,"question":"The variation if focal length of a lens when we pass from the central portion out words (to words the lens edges) is known as","choices":[{"text":"Astigmatism","value":"A"},{"text":"Chromatic","value":"B"},{"text":"Spherical aberration","value":"C"},{"text":"Coma","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":121202,"question":"Which of the following light move faster in water","choices":[{"text":"Red","value":"A"},{"text":"Violet","value":"B"},{"text":"Green","value":"C"},{"text":"Blue","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":121200,"question":"An optical fiber of ______ cm in diameter id equivalent to 7.62 cm diameter bundle of ______ wires to carry the same amount of signals","choices":[{"text":"0.6, aluminum","value":"A"},{"text":"6.0, copper","value":"B"},{"text":"0.6, copper","value":"C"},{"text":"6.0, aluminum","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":121197,"question":"The fiber of which refractive index ______ gradually as move from central core to its periphery is called ______ index fiber","choices":[{"text":"Decreases, multi-mode graded","value":"A"},{"text":"Increases, single mode step","value":"B"},{"text":"Either of A or B","value":"C"},{"text":"Increases, multi-mode step","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":121194,"question":"Cladding means a layer of ______ refractive index over the central core of ______ refractive index","choices":[{"text":"Lower, lower","value":"A"},{"text":"Higher, lower","value":"B"},{"text":"Lower, higher","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":121191,"question":"A fiber of 50<span style=\"color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 224);\"><i>μ</i></span>m diameter capable of carrying white light at ______ distances is called ______ index fiber","choices":[{"text":"Large, multi-mode step","value":"A"},{"text":"Small, multi-mode step","value":"B"},{"text":"Small, multi-mode graded","value":"C"},{"text":"Large, single mode step","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":121188,"question":"Propagation of light in an optical fiber requires that light should be","choices":[{"text":"Refracted from air to fiber","value":"A"},{"text":"Continuously refraction","value":"B"},{"text":"Totally reflected within the fiber","value":"C"},{"text":"Both B and C","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":121186,"question":"If we know the refractive index of glass, speed v of light in the glass can be found by","choices":[{"text":"v = c n","value":"A"},{"text":"v = c/n","value":"B"},{"text":"v = n/c","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":121183,"question":"Which type of optical fiber has the largest diameter","choices":[{"text":"Single mode step index fiber","value":"A"},{"text":"Multi-mode step index fiber","value":"B"},{"text":"Multi-mode graded index fiber","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":121182,"question":"Let a ray of light enters from air into two media of different refractive indices. The speed of light will be ______ to refractive index","choices":[{"text":"Directly proportional","value":"A"},{"text":"Inversely proportional","value":"B"},{"text":"Sometimes inversely","value":"C"},{"text":"Equal","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":121181,"question":"The property of light which makes light possible to be transmitted into inaccessible place is","choices":[{"text":"Interference","value":"A"},{"text":"Diffraction","value":"B"},{"text":"Polarization","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":121180,"question":"The laser light used in an optical fiber system has a wavelength equal to","choices":[{"text":"3<span style=\"color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 224);\"><i>μ</i></span>m","value":"A"},{"text":"5<span style=\"color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 224);\"><i>μ</i></span>m","value":"B"},{"text":"1.3<span style=\"color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 224);\"><i>μ</i></span>m","value":"C"},{"text":"6<span style=\"color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 224);\"><i>μ</i></span>m","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":121177,"question":"For glass-air boundary, the value of the critical angle is","choices":[{"text":"42°","value":"A"},{"text":"45°","value":"B"},{"text":"30°","value":"C"},{"text":"60°","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":121176,"question":"The light waves and radio waves differ in","choices":[{"text":"Speed","value":"A"},{"text":"Frequency","value":"B"},{"text":"Wavelength","value":"C"},{"text":"Both B and C","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":121174,"question":"","questionImage":"121174_636344992211163974-RQ.jpg","choices":[{"text":"","img":"121174_636344992211163974-RA1.jpg","value":"A"},{"text":"","img":"121174_636344992211163974-RA2.jpg","value":"B"},{"text":"","img":"121174_636344992211163974-RA3.jpg","value":"C"},{"text":"","img":"121174_636344992211163974-RA4.jpg","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":121171,"question":"A material having high refractive index has","choices":[{"text":"Low density","value":"A"},{"text":"High density","value":"B"},{"text":"Zero density","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":121170,"question":"Cladding in an optical fiber is used to","choices":[{"text":"Absorb unneccessary light","value":"A"},{"text":"Produce total internal reflection","value":"B"},{"text":"Transmit light","value":"C"},{"text":"Filter light","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":121169,"question":"The ability of an instrument of reveal the minor details of an object under examination is called","choices":[{"text":"Resolution","value":"A"},{"text":"Magnification","value":"B"},{"text":"Resolving power","value":"C"},{"text":"Dispersion","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":121164,"question":"The resolving power of a grating spectrometer is","choices":[{"text":"","img":"121164_636344435433522720-RA1.jpg","value":"A"},{"text":"","img":"121164_636344435433522720-RA2.jpg","value":"B"},{"text":"","img":"121164_636344435433522720-RA3.jpg","value":"C"},{"text":"","img":"121164_636344435433522720-RA4.jpg","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":121163,"question":"In case of reflection of ray within a denser medium, angle of incidnet is ______ -angle of reflection","choices":[{"text":"Greater then","value":"A"},{"text":"Smaller then","value":"B"},{"text":"Equal to","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":121162,"question":"A ray of light passing from a rarer to a denser medium","choices":[{"text":"Bends towards normal","value":"A"},{"text":"Bends away from normal","value":"B"},{"text":"Suffers no change in direction","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":121161,"question":"For which color of light the refractive index of glass is larger","choices":[{"text":"Red","value":"A"},{"text":"Green","value":"B"},{"text":"Blue","value":"C"},{"text":"Violet","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":121160,"question":"A shortsighted person can see clearly","choices":[{"text":"Near objects","value":"A"},{"text":"Far objects","value":"B"},{"text":"Objects at 25 cm","value":"C"},{"text":"Objects at infinity","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":121159,"question":"To get higher magnification we must use","choices":[{"text":"Simple microscope","value":"A"},{"text":"A convex lens","value":"B"},{"text":"A compound microscope","value":"C"},{"text":"All of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":121158,"question":"The speed of light in a medium depends upon","choices":[{"text":"Its wavelength","value":"A"},{"text":"Its frequency","value":"B"},{"text":"Refractive index","value":"C"},{"text":"All of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":121157,"question":"The magnification is negative for","choices":[{"text":"Real image","value":"A"},{"text":"Virtual image","value":"B"},{"text":"Sometimes for real sometimes for real","value":"C"},{"text":"Only for cancave lens","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":121156,"question":"The magnifying power of a compound microscope can be increased if we use objective lens of","choices":[{"text":"Large focal length","value":"A"},{"text":"Small focal length","value":"B"},{"text":"Same focal length","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":121155,"question":"The limit of which a microscope can be used to resolve details of an object, demands","choices":[{"text":"Wider objective and light of short wavelength","value":"A"},{"text":"Narrow objective and light of short wavelength","value":"B"},{"text":"Narrow objective and light of longer wavelength","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":121154,"question":"A lens of 2 cm focal length is to be used as a magnifying glass. Its magnification is","choices":[{"text":"13.5","value":"A"},{"text":"12.5","value":"B"},{"text":"0.5","value":"C"},{"text":"2.5","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":121153,"question":"In the formula<span style=\"color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 224);\"><i>α</i></span><sub>amino </sub>= 1.22<span style=\"color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 224);\"><i>λ</i></span>/D, D denotes","choices":[{"text":"Distance between source and the object","value":"A"},{"text":"Diameter of lens","value":"B"},{"text":"Power of the lens in Diopters","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":121152,"question":"A grating with high resolving power can distinguish ______ difference in ______","choices":[{"text":"Smaller, amplitude","value":"A"},{"text":"Greater, wavelength","value":"B"},{"text":"Smaller, wavelength","value":"C"},{"text":"Greater, intensity","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":121151,"question":"The angle of incidence at which angle of refraction becomes 90<sup>0</sup> is called","choices":[{"text":"Incident angle","value":"A"},{"text":"Angle of refraction","value":"B"},{"text":"Critical angle","value":"C"},{"text":"Phase angle","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":121150,"question":"The image of an object 5 mm length is only 1 cm high. The magnification of the lens is","choices":[{"text":"1","value":"A"},{"text":"0.2","value":"B"},{"text":"2","value":"C"},{"text":"0.1","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":121149,"question":"When the same object is viewed at a shorter distance the image on the retina of eye is ______ and so the object appears ______","choices":[{"text":"Greater, small","value":"A"},{"text":"Smaller, smaller","value":"B"},{"text":"Smaller, larger","value":"C"},{"text":"Greater, larger","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":121148,"question":"The refractive index of a medium is defined as a ratio","choices":[{"text":"","img":"121148_636344420355552963-RA1.jpg","value":"A"},{"text":"","img":"121148_636344420355552963-RA2.jpg","value":"B"},{"text":"","img":"121148_636344420355552963-RA3.jpg","value":"C"},{"text":"","img":"121148_636344420355552963-RA4.jpg","value":"D"},{"text":"","value":"E"}],"correctAnswer":3},{"id":121147,"question":"Certain light of wavelength 600 nm is used to view an object under the microscope. If the aperture of its objective is 1.22 cm, then the limiting angle of resolution will be","choices":[{"text":"6 x 10<sup>-5</sup>rad","value":"A"},{"text":"7 x 10<sup>-5</sup>rad<sup></sup>","value":"B"},{"text":"8 x 10<sup>-5</sup>rad","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1}]