[{"id":121146,"question":"The eye piece of a compound microscope acts as a","choices":[{"text":"Diverging lens","value":"A"},{"text":"Converging lens","value":"B"},{"text":"Diverging mirror","value":"C"},{"text":"Converging mirror","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":121145,"question":"Conventionally, all the distances p, q, f, are measured from ______ of the lens","choices":[{"text":"Focus","value":"A"},{"text":"Optical center","value":"B"},{"text":"Edges","value":"C"},{"text":"Centre of curvature","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":121144,"question":"An optical fiber carries data in the form","choices":[{"text":"Lights signals","value":"A"},{"text":"Sound signals","value":"B"},{"text":"A wave","value":"C"},{"text":"A particle","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":121143,"question":"The ratio of diameters of two convex lenses is ______ the ratio of their focal lengths","choices":[{"text":"Greater than","value":"A"},{"text":"Less than","value":"B"},{"text":"Equal to","value":"C"},{"text":"Square of","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":121142,"question":"A single converging lens placed close to the eye to see magnified image is called","choices":[{"text":"A telescope","value":"A"},{"text":"Compound microscope","value":"B"},{"text":"Simple microscope","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":121141,"question":"If the focal of a convex lens is 5 cm then to get real and inverted image of the same size as that of object, the object should be placed at","choices":[{"text":"5 cm","value":"A"},{"text":"10 cm","value":"B"},{"text":"15 cm","value":"C"},{"text":"20 cm","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":121140,"question":"How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper","choices":[{"text":"The upper half of the image is cut off","value":"A"},{"text":"The brightness of the image is reduce","value":"B"},{"text":"The brightness of the image is increased","value":"C"},{"text":"Lower half of the image is cut off","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":121137,"question":"When a light signal travels along the length of the optical fibre, the power lost by it is due to","choices":[{"text":"Reflection","value":"A"},{"text":"Refraction","value":"B"},{"text":"Seattering and absorption","value":"C"},{"text":"Diffraction","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":121136,"question":"The path difference involved in interference in thin films depends upon","choices":[{"text":"Thickness and nature of thin films","value":"A"},{"text":"Angular of incidence of light","value":"B"},{"text":"Nature of media on both sides of thin film","value":"C"},{"text":"All of these","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":121135,"question":"When the object lies between F and 2F the image formed by a convex lens is","choices":[{"text":"Real","value":"A"},{"text":"Virtual","value":"B"},{"text":"Diminished","value":"C"},{"text":"Erect","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":121134,"question":"The speed of light in a medium of refractive index 1.5 is","choices":[{"text":"3 x 10<sup>8</sup>ms<sup>-1</sup>","value":"A"},{"text":"4.5 x 10<sup>8</sup>ms<sup>-1</sup>","value":"B"},{"text":"2.0 x 10<sup>8</sup>ms<sup>-1</sup>","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":121133,"question":"A convex ens acts as diverging lens when the object is placed","choices":[{"text":"Between F and 2F","value":"A"},{"text":"At 2F","value":"B"},{"text":"Within the focal length","value":"C"},{"text":"Beyond 2F","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":121132,"question":"Spherical aberration can be reduced by using","choices":[{"text":"Convex lens","value":"A"},{"text":"All the portions of the lens","value":"B"},{"text":"Central portion of the lens","value":"C"},{"text":"Upper portion of the lens","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":121131,"question":"The total magnification of a combination of two lenses having individual magnification M1 and M2 is","choices":[{"text":"M<sub>1</sub>+ M<sub>2</sub>","value":"A"},{"text":"M<sub>1</sub>M<sub>2</sub>","value":"B"},{"text":"M<sub>1</sub>- M<sub>2</sub>","value":"C"},{"text":"M<sub>1</sub>/ M<sub>2</sub>","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":121130,"question":"The unit of power of a lens is","choices":[{"text":"Meter","value":"A"},{"text":"Watt","value":"B"},{"text":"Horsepower","value":"C"},{"text":"Dioptre","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":121129,"question":"An object is placed between the focus and the optical center of the convex lens. The image formed is","choices":[{"text":"Real, erect and magnified","value":"A"},{"text":"Virtual, inverted and magnified","value":"B"},{"text":"Virtual, erect and diminished","value":"C"},{"text":"Virtual, erect and magnified","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":121128,"question":"The magnification of a compound microscope of object and eye piece of focal lengths f<sub>0</sub>and f<sub>e</sub>, respectively is","choices":[{"text":"","img":"121128_636344400474436123-RA1.jpg","value":"A"},{"text":"","img":"121128_636344400474436123-RA2.jpg","value":"B"},{"text":"","img":"121128_636344400474436123-RA3.jpg","value":"C"},{"text":"","img":"121128_636344400474436123-RA4.jpg","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":121127,"question":"Angular magnification of a simple microscope is given as","choices":[{"text":"","img":"121127_636344395500362277-RA1.jpg","value":"A"},{"text":"","img":"121127_636344395500362277-RA2.jpg","value":"B"},{"text":"","img":"121127_636344395500362277-RA3.jpg","value":"C"},{"text":"","img":"121127_636344395500362277-RA4.jpg","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":121126,"question":"Power of a lens is equal to","choices":[{"text":"Focal length in meters ","value":"A"},{"text":"Reciprocal of focal length expressed in meters","value":"B"},{"text":"Double the focal length","value":"C"},{"text":"Half the focal length","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":121125,"question":"The magnification of a simple microscope of focal length 5cm is","choices":[{"text":"3","value":"A"},{"text":"5","value":"B"},{"text":"6","value":"C"},{"text":"20","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":121124,"question":"A point on the surface of the mirror where principle axis meets is called","choices":[{"text":"Focus","value":"A"},{"text":"Centre of curvature","value":"B"},{"text":"Pole","value":"C"},{"text":"Aperture","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":121123,"question":"Maximum detail of object can be seen from a microscope wen light used is of","choices":[{"text":"Shorter wavelength","value":"A"},{"text":"Longer wavelength","value":"B"},{"text":"White light","value":"C"},{"text":"Any light","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":121122,"question":"Least distance of distinct vision","choices":[{"text":"Decrease with increasing age","value":"A"},{"text":"Increases with increasing age","value":"B"},{"text":"Does not vary with age","value":"C"},{"text":"May increase or decrease with age","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":121121,"question":"The least distance of distinct vision for a normal eye is","choices":[{"text":"15 cm","value":"A"},{"text":"25 cm","value":"B"},{"text":"<div>35 cm</div>","value":"C"},{"text":"1 m","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":121120,"question":"Diffraction effect is","choices":[{"text":"More for a round edge","value":"A"},{"text":"More for a sharp edge","value":"B"},{"text":"Less for a sharp edge","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":121119,"question":"The spacing between lines of diffraction grating is","choices":[{"text":"Opaque","value":"A"},{"text":"Transparent","value":"B"},{"text":"Semi-transparent","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":121118,"question":"Maximum number of orders available with a grating is ______ grating element","choices":[{"text":"Independent of","value":"A"},{"text":"Directly proportional to","value":"B"},{"text":"Inversely proportional to","value":"C"},{"text":"Equal to","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":121117,"question":"Given that grating element = 0.2 x 10<sup>-3</sup>cm in case of a diffraction grating. Then number of lines per centimeter will be","choices":[{"text":"500000","value":"A"},{"text":"5000","value":"B"},{"text":"50","value":"C"},{"text":"5","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":121116,"question":"Michelson,s interferometer can be used to measure","choices":[{"text":"Wavelength of light","value":"A"},{"text":"Intensity of light","value":"B"},{"text":"Amplitude of wave","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":121115,"question":"In Newton,s rings apparatus, we also use","choices":[{"text":"Spectroscope","value":"A"},{"text":"Telescope","value":"B"},{"text":"Microscope","value":"C"},{"text":"Turn table","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":121114,"question":"A ______ lens is used in the apparatus to get Newton,s rings","choices":[{"text":"Plano-concave","value":"A"},{"text":"Plano-convex","value":"B"},{"text":"Convexo-concave","value":"C"},{"text":"Double convex","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":121113,"question":"In YDS experiment using white light","choices":[{"text":"Colored fringes will be obtained","value":"A"},{"text":"No fringes will be observed","value":"B"},{"text":"Alternative bright and dark fringes will be seen","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":121112,"question":"In YDS experiment, the condition for constructive interference of two coherent waves is that the path difference should be","choices":[{"text":"Integral multiple of<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>/2","value":"A"},{"text":"Integral multiple of<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>","value":"B"},{"text":"Even integral multiple of<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>/2","value":"C"},{"text":"Both A and C","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":121111,"question":"Conditions for interference are that the two sources should be coherent and","choices":[{"text":"At a far off distance","value":"A"},{"text":"Close together","value":"B"},{"text":"Coinciding","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":121108,"question":"The bending of light when it passes from one medium to another is known as","choices":[{"text":"Refraction","value":"A"},{"text":"Interference","value":"B"},{"text":"Polarization","value":"C"},{"text":"Diffraction","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":121106,"question":"In YDS experiment, data given is<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, 248);\"><i>λ</i></span>= 500 nm, L = 100 cm,<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>Δ</i></span>y comes out to be","choices":[{"text":"0.5 cm","value":"A"},{"text":"0.5 mm","value":"B"},{"text":"0.5 nm","value":"C"},{"text":"0.5 m","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":121104,"question":"Fringe spacing in YDS experiment will be maximum if we use","choices":[{"text":"Red light","value":"A"},{"text":"Green light","value":"B"},{"text":"Violet light","value":"C"},{"text":"Blue light","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":121103,"question":"If the slits in YDS experiment are made closer, fringe spacing will","choices":[{"text":"Increase","value":"A"},{"text":"Decrease","value":"B"},{"text":"Remain same","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":121102,"question":"In YDS experiment, if the distance between the slits and also the distance between slits and screen is doubled, the fringe width","choices":[{"text":"Becomes doubled","value":"A"},{"text":"Becomes 4 times","value":"B"},{"text":"Is halved","value":"C"},{"text":"Remains the same","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":121100,"question":"In case of YDS experiment, the distance of the mth bright fringe on the screen from center is","choices":[{"text":"Y = (m + 1)<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, 248);\"><i>λ</i></span>L/d","value":"A"},{"text":"Y = m<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, 248);\"><i>λ</i></span>L/d","value":"B"},{"text":"Y = (m + 1/2)<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, 248);\"><i>λ</i></span>L/d","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2}]