[{"id":211555,"question":"The deflection image due to oblique centric rays failing on the lens is called.","choices":[{"text":"Coma","value":"A"},{"text":"Spherical aberration","value":"B"},{"text":"Astigmatism","value":"C"},{"text":"Curvature of image field","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":211554,"question":"The variation of focal length of a lens when we pass from the central portion to periphery is called.","choices":[{"text":"Coma","value":"A"},{"text":"Astigmatism","value":"B"},{"text":"Spherical aberration","value":"C"},{"text":"Chromatic aberration","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":211553,"question":"Dispersive power of a prism depends upon the wavelength of the light used and is","choices":[{"text":"More for large wavelengths","value":"A"},{"text":"Less for large wavelengths","value":"B"},{"text":"More for small wavelengths","value":"C"},{"text":"Less for small wavelengths","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":211552,"question":"Which term is used for human eye deflect near sightedness.","choices":[{"text":"Myopia","value":"A"},{"text":"Hypermetropia","value":"B"},{"text":"Presbyopia","value":"C"},{"text":"Calaract","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":211551,"question":"Which scientist made the fist successful terrestrial measurement of the speed of light","choices":[{"text":"Isaac Newton","value":"A"},{"text":"Ole Romer","value":"B"},{"text":"Armand Fizeace","value":"C"},{"text":"Albert Michelson","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":211550,"question":"The primary purpose of using a large aperture objective in a telescope is to produce","choices":[{"text":"Brighter image","value":"A"},{"text":"Larger image","value":"B"},{"text":"Wider field of view","value":"C"},{"text":"Smaller image","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":211549,"question":"A diverging lens may not have","choices":[{"text":"Negative focal length","value":"A"},{"text":"Positive focal length","value":"B"},{"text":"One plane surface","value":"C"},{"text":"One convex surface","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":211548,"question":"What is zoom lens","choices":[{"text":"It is a lens having fixed focal length","value":"A"},{"text":"It is a lens having variable focal length","value":"B"},{"text":"It is a lens used in radii to telescope","value":"C"},{"text":"All of the above","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":211547,"question":" A Fly is found to be sitting on a telescope when it is focused towards the moon What effect is expected on the photograph of the moon.","choices":[{"text":"Intensity remains unchanged","value":"A"},{"text":"No effect","value":"B"},{"text":"The complete field of view is blocked","value":"C"},{"text":"Coloured image will be seen","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":211546,"question":"The function of collimator in spectrometer is to","choices":[{"text":"Disperse the light","value":"A"},{"text":"Reflect the light","value":"B"},{"text":"Make the light parallel","value":"C"},{"text":"Diffract the light","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":211545,"question":"In a compound microscope magnification will be large if focal length of eyepiece is","choices":[{"text":"Large","value":"A"},{"text":"small","value":"B"},{"text":"Equal to that of the objective","value":"C"},{"text":"Larger than that of the objective","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":211544,"question":"Which of the following is the cause of failure of a lens to form a sharp and district image of a white object.","choices":[{"text":"Spherical aberration","value":"A"},{"text":"Chromatic aberration","value":"B"},{"text":"Distortion","value":"C"},{"text":"Astigmatism","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":211543,"question":"The normal adjustment the magnifying power of an astronomical telescope is.","choices":[{"text":"fe/fo","value":"A"},{"text":"fo/fe","value":"B"},{"text":"fo+ fe","value":"C"},{"text":"fo -fe","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":211542,"question":"If the image is virtual then its distance from the lens is taken.","choices":[{"text":"Positive","value":"A"},{"text":"Negative","value":"B"},{"text":"Double","value":"C"},{"text":"Half","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":211541,"question":"linear magnification is the ratio between the","choices":[{"text":"Distances of object and image from mirror","value":"A"},{"text":"Distances of object and image from the focal point","value":"B"},{"text":"Distance of image and object from the mirror","value":"C"},{"text":"Distance of image from object and the distance of object from mirror","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":211540,"question":"The near point of a person is 50 cm and his far point is 200 cm The power of the lenses which his spectacles should have to see clearly distant objects will be.","choices":[{"text":"-0.5 D","value":"A"},{"text":"-10 d","value":"B"},{"text":"-1.5 D","value":"C"},{"text":"-2.0 D","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":211539,"question":"The near point of a person is 50 cm and his far point is 200 cm The power of the lenses which his spectacles should have for reading will be","choices":[{"text":"+D","value":"A"},{"text":"+2D","value":"B"},{"text":"+4D","value":"C"},{"text":"-2D","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":211538,"question":"The real depth of a swimming pool is 2 m What is the apparent depth of the pool if the refractive index of water is 1.33","choices":[{"text":"1.0 m","value":"A"},{"text":"1.5 cm","value":"B"},{"text":"2.0 m","value":"C"},{"text":"2.5 m","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":211537,"question":"Which of the following are defects is lenses.","choices":[{"text":"Chromatic aberration","value":"A"},{"text":"Spherical aberration","value":"B"},{"text":"Astigmation","value":"C"},{"text":"All of the above","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":211536,"question":"Which instrument measures the magnification of a telescope.","choices":[{"text":"lactometer","value":"A"},{"text":"dynamometer","value":"B"},{"text":"Wattmeter","value":"C"},{"text":"Ammeter","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":211535,"question":"Clouds are white because they efficiently scatter sunlight of all","choices":[{"text":"Colours","value":"A"},{"text":"Wavelengths","value":"B"},{"text":"Frequencies","value":"C"},{"text":"Phases","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":211534,"question":"Which of the following are defects in human eye.","choices":[{"text":"Myopia","value":"A"},{"text":"Hypermetropia","value":"B"},{"text":"Presbyopia","value":"C"},{"text":"All of these","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":211533,"question":"In water drops rainbows are formed by","choices":[{"text":"Reflection","value":"A"},{"text":"Refraction","value":"B"},{"text":"Dispersion","value":"C"},{"text":"All of these","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":211532,"question":"The blooming of the image due to dispersion in lenses is called.","choices":[{"text":"spherical aberration","value":"A"},{"text":"Chromatic aberration","value":"B"},{"text":"Astigmation","value":"C"},{"text":"Curvature of image field","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":211531,"question":"Power of lens is measured in","choices":[{"text":"cm","value":"A"},{"text":"Metres","value":"B"},{"text":"cm-1","value":"C"},{"text":"Dioptres","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":211530,"question":"Which of the following is used for the failure of a lens to form a sharp and distinct image.","choices":[{"text":"Distortion","value":"A"},{"text":"Astrigmation","value":"B"},{"text":"Chromatic aberration","value":"C"},{"text":"spherical aberration","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":211529,"question":"Which of the following is used for the failure of a lens to form a sharp and distinct image","choices":[{"text":"Distortion","value":"A"},{"text":"Astigmation","value":"B"},{"text":"Chromatic aberration","value":"C"},{"text":"Spherical aberration","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":211528,"question":"Which Muslim Scientist is regarded as 'Father of Optics\"","choices":[{"text":"Nasir al Din al Tusi","value":"A"},{"text":"Ibn Ishaq al kundi","value":"B"},{"text":"Ibn Musa Al khawarzmi","value":"C"},{"text":"Ibn al Haithem","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":211527,"question":"Which of the following is used for reducing spherical aberrations in optical instruments.","choices":[{"text":"Plano convex lens","value":"A"},{"text":"Concave lens","value":"B"},{"text":"Spherical mirrors","value":"C"},{"text":"Piane mirrors","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":211526,"question":"Which Muslim Scientist gave the first clear description and correct analysis of pinhole camera.","choices":[{"text":"Nasir al Din Al tusi","value":"A"},{"text":"Ibn al Haithem","value":"B"},{"text":"Ibn Ishaqal kundi","value":"C"},{"text":"al -Khawarizmi","value":"D"},{"value":"E"}],"correctAnswer":2}]