[{"id":32424,"question":"Who attempted to measure the speed of light","choices":[{"text":"Gallileo","value":"A"},{"text":"Michelson","value":"B"},{"text":"Newton","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":32423,"question":"The refracting edge of the prism must be parallel to the axis of rotation of the telescope, so that the turn table is leveled using","choices":[{"text":"Screws of the spectrometer","value":"A"},{"text":"Leveling screws","value":"B"},{"text":"Turn table screw","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":32422,"question":"A telescope is rotatable about the same vertical axis as the turntable, with a scale which is","choices":[{"text":"Main scale","value":"A"},{"text":"Vernier scale","value":"B"},{"text":"Half degree scale","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":32421,"question":"A circular scale is attached and graduated in","choices":[{"text":"One degree","value":"A"},{"text":"2 degrees","value":"B"},{"text":"Half degree","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":32420,"question":"Turn table is the plateform over which we place","choices":[{"text":"Diffraction grating","value":"A"},{"text":"Prism","value":"B"},{"text":"Glass slab","value":"C"},{"text":"a and b","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":32419,"question":"The function of colimator is","choices":[{"text":"To converge the incoming rays","value":"A"},{"text":"To make the parallel rays from source","value":"B"},{"text":"In which the source of light is kept","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":32418,"question":"The different parts of spectrometer","choices":[{"text":"Collimator","value":"A"},{"text":"Turn table","value":"B"},{"text":"Telescope","value":"C"},{"text":"All of these","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":32417,"question":"Spectrometer using diffraction grating can measure","choices":[{"text":"Wavelength of light","value":"A"},{"text":"Frequency of light","value":"B"},{"text":"Intensity of light","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":32416,"question":"Spectrometer can measure quite accurately prism","choices":[{"text":"Deviation of light by a glass prism","value":"A"},{"text":"Angle of prism","value":"B"},{"text":"Refractive index of the material of prism","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":32415,"question":"A spectrometer is an optical device used to study the spectra from different sources of light which is","choices":[{"text":"Absorption spectra","value":"A"},{"text":"Emission spectra&nbsp;","value":"B"},{"text":"Discrete spectra","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":32408,"question":"In normal adjustment, the length of the telescope is","choices":[{"text":"f<sub>e</sub> + f<sub>o</sub>","value":"A"},{"text":"f<sub>o</sub> - f<sub>e</sub>","value":"B"},{"text":"f<sub>e</sub> - f<sub>o</sub>","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":32406,"question":"When an image formed by the objective lies at the focus of both the objective and the eye-piece, the telescope is said to be in","choices":[{"text":"Final adjustment","value":"A"},{"text":"Normal adjustment","value":"B"},{"text":"Initial adjustment","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":32404,"question":"When an image is placed at the focal length of the eye piece, the final image formed at","choices":[{"text":"2 F","value":"A"},{"text":"4 F","value":"B"},{"text":"6 F","value":"C"},{"text":"Infinity","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":32403,"question":"The image formed after objective lens of an astronomical telescope is","choices":[{"text":"Inverted","value":"A"},{"text":"Diminished","value":"B"},{"text":"Real","value":"C"},{"text":"All of these","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":32401,"question":"In an astronomical telescope the eye piece has the focal length f<sub>e</sub> if","choices":[{"text":"Short","value":"A"},{"text":"Long","value":"B"},{"text":"Extremely long","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":32399,"question":"In an astronomical telescope is the objective has the focal length f<sub>o</sub> is","choices":[{"text":"Small","value":"A"},{"text":"Very small","value":"B"},{"text":"Long","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":32397,"question":"A simple telescope is consists of","choices":[{"text":"One convex lens","value":"A"},{"text":"Two convex lenses","value":"B"},{"text":"Three convex lenses","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":32396,"question":"In viewing the distant objects the angle subtended at the telescope is","choices":[{"text":"Smaller","value":"A"},{"text":"Bigger","value":"B"},{"text":"Very large","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":32395,"question":"Telescope is an optical device used for viewing","choices":[{"text":"Near objects","value":"A"},{"text":"Not far distance","value":"B"},{"text":"Distant objects","value":"C"},{"text":"b and c","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":32394,"question":"If the magnification M<sub>1</sub> = 20.0 for objective and M<sub>2</sub> = 12.0 then total magnification is","choices":[{"text":"200","value":"A"},{"text":"240","value":"B"},{"text":"260","value":"C"},{"text":"280","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":32393,"question":"If the focal length of the eye piece 25.0 mm find its magnification","choices":[{"text":"12.0","value":"A"},{"text":"14.0","value":"B"},{"text":"- 11.0","value":"C"},{"text":"- 13.0","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":32392,"question":"If the focal length of objective is 10 mm find its magnification","choices":[{"text":"18","value":"A"},{"text":"19","value":"B"},{"text":"20","value":"C"},{"text":"21","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":32390,"question":"A microscope has an objective lens of 10 mm focal length and an eye piece of 25.0 mm focal length what is the distance between the lenses","choices":[{"text":"≈ 200 mm","value":"A"},{"text":"≈ 210 mm","value":"B"},{"text":"≈ 213 mm","value":"C"},{"text":"≈ 233 mm","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":32388,"question":"A compound microscope is consists of objective of","choices":[{"text":"Long focal length and short focal length of eye piece","value":"A"},{"text":"Objective of very short focal length and eye piece of long focal length","value":"B"},{"text":"Objective of very short focal length end eye piece of also short focal length","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":32386,"question":"A compound microscope is consists of an eye piece &nbsp;of focal length","choices":[{"text":"Short","value":"A"},{"text":"Very short","value":"B"},{"text":"Large","value":"C"},{"text":"Very large","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":32384,"question":"A compound microscopes consists of objective of","choices":[{"text":"Very short focal length","value":"A"},{"text":"Large focal length","value":"B"},{"text":"Very large focal length","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":32382,"question":"A compound microscope is consists of","choices":[{"text":"One convex lens","value":"A"},{"text":"Two convex lenses","value":"B"},{"text":"Two concave lenses","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":32381,"question":"Whenever high magnification is desired","choices":[{"text":"A telescope is used","value":"A"},{"text":"A compound microscope is used","value":"B"},{"text":"A microscope is used","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":32378,"question":"Magnification of a convex lens is","choices":[{"text":"M = p/d","value":"A"},{"text":"M = p/q","value":"B"},{"text":"M = q/p","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":32377,"question":"If N is the number of rulings on the grating, then the resolving power in the mth order diffraction equals to","choices":[{"text":"R = N&nbsp;× m","value":"A"},{"text":"R = N/m","value":"B"},{"text":"R = m/N","value":"C"},{"text":"R = N&nbsp;× m<sup>2</sup>","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":32374,"question":"The optical resolution of microscope or a telescope tells us how close together, the two point sources of light can be so that they are still seen as two separate sources","choices":[{"text":"Angular magnification","value":"A"},{"text":"Resolution","value":"B"},{"text":"Magnification","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":32372,"question":"When the object is closer to eye or near point, the image becomes","choices":[{"text":"Sharp","value":"A"},{"text":"Clear visible","value":"B"},{"text":"Blurred","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":32371,"question":"The ratio of size of the image to the size of the object is called","choices":[{"text":"Resolving power","value":"A"},{"text":"Magnification","value":"B"},{"text":"Power","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":32370,"question":"If f = 5 cm and d = 25 cm then the magnification will be","choices":[{"text":"2","value":"A"},{"text":"4","value":"B"},{"text":"5","value":"C"},{"text":"6","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":32368,"question":"The maximum size of an object as seen by the naked eye is obtained when it is placed of","choices":[{"text":"Far point","value":"A"},{"text":"Near point","value":"B"},{"text":"Distant point None of these","value":"C"},{"value":"D"},{"value":"E"}],"correctAnswer":2},{"id":32367,"question":"The apparent size of an object depends on the angle subtended but it at the eye. As the angle increases the size of the object","choices":[{"text":"Smaller","value":"A"},{"text":"Larger","value":"B"},{"text":"Very large","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":32365,"question":"As the object is brought from a far off point to he focus, the magnification goes on","choices":[{"text":"Increasing","value":"A"},{"text":"Decreasing","value":"B"},{"text":"Do not change","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":32362,"question":"The least distance of distinct vision changes with","choices":[{"text":"Time","value":"A"},{"text":"Health","value":"B"},{"text":"illness","value":"C"},{"text":"Age","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":32361,"question":"The least distance of he distinct vision is","choices":[{"text":"20 cm","value":"A"},{"text":"22 cm","value":"B"},{"text":"25 cm","value":"C"},{"text":"30 cm","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":32360,"question":"The normal human eye can focus a sharp image of an object located anywhere form infinity to a certain point called","choices":[{"text":"Far point","value":"A"},{"text":"Near point","value":"B"},{"text":"distant point","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2}]