[{"id":155411,"question":"A convex lens acts as diverging lens when the object is placed:","choices":[{"text":"Between F and 2F","value":"A"},{"text":"At 2F","value":"B"},{"text":"With focal length","value":"C"},{"text":"Beyond 2F","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":155410,"question":"The distance from eye to near point is taken as:","choices":[{"text":"10 cm","value":"A"},{"text":"15 cm","value":"B"},{"text":"20 cm","value":"C"},{"text":"25 cm","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":155409,"question":"With age, least distance of distinct vision:","choices":[{"text":"Increases","value":"A"},{"text":"Decreases","value":"B"},{"text":"Is not affected","value":"C"},{"text":"None is correct","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":155408,"question":"The least distance of distinct vision is:","choices":[{"text":"10 cm","value":"A"},{"text":"25 cm","value":"B"},{"text":"50 cm","value":"C"},{"text":"100 cm","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":155407,"question":"In YDS experiment, fringe spacing means the distance between two consecutive ____fringes.","choices":[{"text":"Bright","value":"A"},{"text":"Dark","value":"B"},{"text":"Any of A and B","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":155405,"question":"In an interference pattern of Young's double slit(YDS) experiment:","choices":[{"text":"Bright fringesare wider than dark fringes","value":"A"},{"text":"Dark fringes are wider than bright fringes","value":"B"},{"text":"Both dark and bright fringes are of equal width","value":"C"},{"text":"<div><br></div><div>Central fringes are wider than the outer fringes</div>","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":155398,"question":"In case of constructive interference of two waves, the amplitude of the resultant wave is _______ either of the waves:","choices":[{"text":"Greater than","value":"A"},{"text":"Equal to","value":"B"},{"text":"Smaller than","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":155396,"question":"The terms phase difference and path difference are:","choices":[{"text":"Same","value":"A"},{"text":"Different","value":"B"},{"text":"Equal","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":155394,"question":"In case of destructive interference of two waves, the amplitude of the resultant wave will be ____ either of the waves:","choices":[{"text":"Greater than","value":"A"},{"text":"Smaller than","value":"B"},{"text":"Equal to","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":155393,"question":"To observe interference of light, the condition, which must be met with is that the sources must be:","choices":[{"text":"Monochromatic","value":"A"},{"text":"Phase coherent","value":"B"},{"text":"Both of above","value":"C"},{"text":"None of above","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":155391,"question":"To sources are said to be coherent if they have:","choices":[{"text":"Same amplitude","value":"A"},{"text":"Same wavelength","value":"B"},{"text":"Definite phase relation with each other","value":"C"},{"text":"None of them","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":155389,"question":"The appearance of the colour in the soap (oil) film results from:","choices":[{"text":"Dispersion","value":"A"},{"text":"Interference","value":"B"},{"text":"Reflection","value":"C"},{"text":"Refraction","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":155388,"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":155386,"question":"A line which represents the direction of travel of a wave is known as:","choices":[{"text":"Spherical Wavefront","value":"A"},{"text":"Locus","value":"B"},{"text":"Ray","value":"C"},{"text":"Either B or C","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":155383,"question":"Huygen's principles states that:","choices":[{"text":"Light has dual nature","value":"A"},{"text":"Either of these","value":"B"},{"text":"None of these","value":"C"},{"text":"Light travels in straigth line","value":"D"},{"value":"E"}],"correctAnswer":3}]