[{"id":32141,"question":"The fringe spacing in case of red light","choices":[{"text":"Increases","value":"A"},{"text":"Decreases","value":"B"},{"text":"Remains the same","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":32140,"question":"&nbsp;In the phenomenon of interference, the bright and dark fringes are of","choices":[{"text":"Different width","value":"A"},{"text":"Equal width","value":"B"},{"text":"Dark fringes are thicker than bright","value":"C"},{"text":"Nona of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":32138,"question":"Fringe spacing&nbsp;ΔY is the distance between two adjacent bring fringes on the screen is","choices":[{"text":"ΔY = Lλ/d","value":"A"},{"text":"ΔY = Ld/λ","value":"B"},{"text":"ΔY = dλ/L","value":"C"},{"text":"ΔY = Lλ/d m","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":32130,"question":"If the bright fringe into be observed then we have relation","choices":[{"text":"Y = mLd/λ","value":"A"},{"text":"Y = mλL/d","value":"B"},{"text":"Y =&nbsp;λd/mL","value":"C"},{"text":"Y =&nbsp;λL/md","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":32128,"question":"When&nbsp;'θ' is small then","choices":[{"text":"tan&nbsp;θ&nbsp;≈ sin&nbsp;θ","value":"A"},{"text":"cos&nbsp;θ&nbsp;≈ sin&nbsp;θ","value":"B"},{"text":"sin&nbsp;θ&nbsp;≈ tan&nbsp;θ","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":32126,"question":"Point out angle/angle at which the sin&nbsp;θ and tan&nbsp;θ have the same value","choices":[{"text":"2<sup>o</sup> and 8<sup>o</sup>","value":"A"},{"text":"4<sup>o</sup> and 6<sup>o</sup>","value":"B"},{"text":"2<sup>o</sup> and 4<sup>o</sup>","value":"C"},{"text":"8<sup>o</sup> and 10<sup>o</sup>","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":32125,"question":"If the path difference must be an integral multiple of wavelength","choices":[{"text":"sin&nbsp;θ = md/λ","value":"A"},{"text":"d sin&nbsp;θ = mλ","value":"B"},{"text":"d sin&nbsp;θ = m/λ","value":"C"},{"text":"d sin&nbsp;θ =&nbsp;λ/m","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":32124,"question":"Who devise the experimental arrangement in 1801 for studying interference effects of light","choices":[{"text":"Huygen","value":"A"},{"text":"Young","value":"B"},{"text":"Newton","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":32123,"question":"The points on a Huygen's wave front which sends out secondary wavelets are also","choices":[{"text":"Source","value":"A"},{"text":"Source of secondary wavelets","value":"B"},{"text":"Coherent sources of light","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":32122,"question":"Huygen's wave front which sends out secondary wavelets with a speed equal to","choices":[{"text":"Speed of propagation of the wave","value":"A"},{"text":"Speed of propagation greater than wave","value":"B"},{"text":"Speed of propagation less than the wave","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":32121,"question":"The distance between two concentric wave fronts is","choices":[{"text":"A wave length","value":"A"},{"text":"A half wavelength","value":"B"},{"text":"Zero","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":32120,"question":"The wave propagates in space by the motion of the","choices":[{"text":"Particles","value":"A"},{"text":"Wavefronts","value":"B"},{"text":"Wavelength","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":32119,"question":"The light from the sun reaches to earth with wavefronts","choices":[{"text":"Spherical","value":"A"},{"text":"Cylindrical","value":"B"},{"text":"Plane","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":32105,"question":"Can two lights of car can produce interference","choices":[{"text":"Yes","value":"A"},{"text":"No","value":"B"},{"text":"Partly produce interference","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":32104,"question":"To observe the phenomenon of interference of light, the light should be","choices":[{"text":"Monochromatic","value":"A"},{"text":"Phase coherence","value":"B"},{"text":"Coherent sources","value":"C"},{"text":"All of these","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":32103,"question":"An oil surface floating on water surface exhibits beautiful colour patter, which is due to&nbsp;","choices":[{"text":"Reflection of light","value":"A"},{"text":"Diffraction of light","value":"B"},{"text":"Interference of light","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":32102,"question":"The position of a new wavefront after a certain interval of time can be found by constructing a surface that is","choices":[{"text":"A tangent","value":"A"},{"text":"A tangent envelope","value":"B"},{"text":"Curved surface","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":32101,"question":"Every point of a wavefront may be considered as a","choices":[{"text":"Source","value":"A"},{"text":"Source of wavefront","value":"B"},{"text":"Source of secondary wavefront","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":32100,"question":"A plane wavefront is that which has source","choices":[{"text":"Nearest","value":"A"},{"text":"Distant","value":"B"},{"text":"Near","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":32099,"question":"A spherical wavefront is that which has","choices":[{"text":"A source","value":"A"},{"text":"A point source","value":"B"},{"text":"An extended source","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":32098,"question":"A line normal to the wave front is called","choices":[{"text":"A beam of light","value":"A"},{"text":"A ray of light","value":"B"},{"text":"Both","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":32097,"question":"Wave front is the locus or all points in vibration are in the same","choices":[{"text":"Frequency","value":"A"},{"text":"Phase","value":"B"},{"text":"Wavelength","value":"C"},{"text":"All of these","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":32096,"question":"Who confirm the wave theory of light ?","choices":[{"text":"Newton","value":"A"},{"text":"Michelson","value":"B"},{"text":"Newton","value":"C"},{"text":"Thomos Young","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":32095,"question":"The idea of light as wave produced by","choices":[{"text":"Huygen","value":"A"},{"text":"Newton","value":"B"},{"text":"Thomos Young","value":"C"},{"text":"Michelson","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":32094,"question":"Who gave the idea of light as wave ?","choices":[{"text":"Newton","value":"A"},{"text":"Huygen","value":"B"},{"text":"Thomos Young","value":"C"},{"text":"Bragg","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":32093,"question":"Light is a type of energy which produces sensation of","choices":[{"text":"Sound","value":"A"},{"text":"Feeling","value":"B"},{"text":"Vision","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":31682,"question":"In a semiconductor,the mobility of holes is","choices":[{"text":"Greater then electrons","value":"A"},{"text":"Less than electrons","value":"B"},{"text":"Equal to electrons","value":"C"},{"text":"None","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":31681,"question":"N-type crystal is","choices":[{"text":"Neutral","value":"A"},{"text":"Positively charged","value":"B"},{"text":"Negative charged","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":31680,"question":"The critical temperature for mercury is","choices":[{"text":"1.18 K","value":"A"},{"text":"4.2 K","value":"B"},{"text":"3.72 K","value":"C"},{"text":"7.2 K","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":31679,"question":"Arsenic antimony or phosphorus are impurities of","choices":[{"text":"p-type","value":"A"},{"text":"n-type","value":"B"},{"text":"May be p-type or n-type","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":31678,"question":"In n-type substances the minority carriers are","choices":[{"text":"Holes","value":"A"},{"text":"Electrons","value":"B"},{"text":"Neutrons","value":"C"},{"text":"None","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":31677,"question":"A substance which have empty conduction band is called","choices":[{"text":"Conductor","value":"A"},{"text":"Insulator","value":"B"},{"text":"Semiconductor","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":31676,"question":"The electrons in the outermost shell of an atom are called","choices":[{"text":"Valence electrons","value":"A"},{"text":"Tightly bound electrons","value":"B"},{"text":"Free electrons","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":31675,"question":"Young's modulus for copper is","choices":[{"text":"70 x 10 Nm<sup>-2</sup>","value":"A"},{"text":"91 x 10 Nm<sup>-2</sup>","value":"B"},{"text":"110 Nm<sup>-2</sup>","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":31674,"question":"The units of modulus of elasticity are same as that of","choices":[{"text":"Stress","value":"A"},{"text":"Strain","value":"B"},{"text":"Force","value":"C"},{"text":"None","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":31673,"question":"The ratio of applied stress to volumetric strain is called","choices":[{"text":"shear modulus","value":"A"},{"text":"Young's modulus","value":"B"},{"text":"Bulk modulus","value":"C"},{"text":"None of 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solids","value":"A"},{"text":"Crystalline solids","value":"B"},{"text":"Glassy solids","value":"C"},{"value":"D"},{"value":"E"}],"correctAnswer":1}]