[{"id":170358,"question":"Totally reflecting prism is used in:
","choices":[{"text":"Periscope
","value":"A"},{"text":"Binoculars
","value":"B"},{"text":"Periscope and binocular
","value":"C"},{"text":"Telescope
","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":170357,"question":"In totally reflecting prism one angle is of 90°, and other\r\ntwo angles are of:
","choices":[{"text":"30°,30°
","value":"A"},{"text":"45°,90°
","value":"B"},{"text":"45°,45°
","value":"C"},{"text":"40°,40°
","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":170323,"question":"In totally reflecting prism one angle is of:
","choices":[{"text":"45°
","value":"A"},{"text":"90°
","value":"B"},{"text":"180°
","value":"C"},{"text":"120°
","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":170322,"question":"To see from submarine and the ship at the surface of water,\r\nwe use:
","choices":[{"text":"Telescope
","value":"A"},{"text":"Microscope
","value":"B"},{"text":"Periscope
","value":"C"},{"text":"Prism
","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":170321,"question":"The angle at which prism deviates the incident ray is\r\ncalled:
","choices":[{"text":"Angle of incident
","value":"A"},{"text":"Angle of reflection
","value":"B"},{"text":"Angle of deviation
","value":"C"},{"text":"Angle of minimum deviation
","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":170320,"question":"The minimum value of angle of deviation is called:
","choices":[{"text":"Minimum angle
","value":"A"},{"text":"Incident angle
","value":"B"},{"text":"Angle of minimum deviation
","value":"C"},{"text":"None of these
","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":170319,"question":"The refracted light striking to the side of prism is called:
","choices":[{"text":"Refracted ray
","value":"A"},{"text":"Incident ray
","value":"B"},{"text":"Reflected ray
","value":"C"},{"text":"Emergent ray
","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":170318,"question":"When a ray of light enters from denser medium to rare\r\nmedium, the angle of incidence for which angle of refraction is 90° is called:
","choices":[{"text":"Angle of incidence
","value":"A"},{"text":"Critical angle
","value":"B"},{"text":"Angle of refraction
","value":"C"},{"text":"Angle of deviation
","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":170317,"question":"Bouncing back of light after striking the surface is called:
","choices":[{"text":"Refraction","value":"A"},{"text":"Reflection
","value":"B"},{"text":"Diffraction
","value":"C"},{"text":"Interference
","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":170277,"question":"Spherical mirrors are used in:
","choices":[{"text":"Medical
","value":"A"},{"text":"Search light
","value":"B"},{"text":"Microscope
","value":"C"},{"text":"All of these
","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":170276,"question":"The ray of light after reflection from concave mirror passes\r\nthrough:
","choices":[{"text":"Centre
","value":"A"},{"text":"Principal focus
","value":"B"},{"text":"Pole
","value":"C"},{"text":"Radius
","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":170275,"question":"The line which passes through pole of the mirror and center\r\nof curvature is called principal:
","choices":[{"text":"Axis
","value":"A"},{"text":"Focus
","value":"B"},{"text":"Line
","value":"C"},{"text":"None of these
","value":"D"},{"value":"E"}],"correctAnswer":1}]