[{"id":31667,"question":"The fractional change in volume per unit increase in pressure is called:","choices":[{"text":"Bulk modulus","value":"A"},{"text":"Compressibility","value":"B"},{"text":"Pressure coefficient","value":"C"},{"text":"Volume coefficient","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":31666,"question":"If both the length and radius of the wire are doubled,how does the modulus of elasticity change?","choices":[{"text":"Becomes one fourth","value":"A"},{"text":"Halved","value":"B"},{"text":"Doubled","value":"C"},{"text":"Remains unchanged","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":31665,"question":"Breaking load for units area of cross-section of a wire is called:","choices":[{"text":"Tensile strength","value":"A"},{"text":"Ductibility","value":"B"},{"text":"Yield point","value":"C"},{"text":"Breaking stress","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":31664,"question":"A cable breaks if stretched by more than 2 mm.It is cut into two equal parts.How much either part can be stretched without breaking?","choices":[{"text":"0.25 m","value":"A"},{"text":"0.5 m","value":"B"},{"text":"1 mm","value":"C"},{"text":"2 mm","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":31663,"question":"For obtaining appreciable extension,the wire should be:","choices":[{"text":"Short and thin","value":"A"},{"text":"Long and thin","value":"B"},{"text":"Short and tick","value":"C"},{"text":"Long and thick","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":31662,"question":"According to the Hooke's law the force required to change the length of a wire by '1' is proportional to:","choices":[{"text":"1<sup>-2</sup>","value":"A"},{"text":"1<sup>-1</sup>","value":"B"},{"text":"1","value":"C"},{"value":"D"},{"value":"E"}],"correctAnswer":3},{"id":31661,"question":"A wire is stretched to double of its length.The strain is","choices":[{"text":"2","value":"A"},{"text":"1","value":"B"},{"text":"Zero","value":"C"},{"text":"0.5","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":31660,"question":"How does the Young's modulus vary with the increase of temperature?","choices":[{"text":"Decrease","value":"A"},{"text":"Increase","value":"B"},{"text":"Remains constant","value":"C"},{"text":"First increases and then decreases","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":31659,"question":"The modulus of elasticity of a liquid is:","choices":[{"text":"Zero","value":"A"},{"text":"1","value":"B"},{"text":"Infinity","value":"C"},{"text":"A value not one of those mentioned above","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":31658,"question":"Steel is preferred for making springs over copper.Whey?","choices":[{"text":"Steel is cheaper","value":"A"},{"text":"Young;s modulus of steel is more than that of copper","value":"B"},{"text":"Young's modulus of copper is more than that of steel","value":"C"},{"text":"Steel is less likely to be oxidized.","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":31657,"question":"Which of the modulus of elasticity is involved in compressing a rod to decrease its length?","choices":[{"text":"Young's modulus","value":"A"},{"text":"Bulk modulus","value":"B"},{"text":"Modulus of rigidity","value":"C"},{"text":"None of the above","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":31656,"question":"The dimensional formula for the modulus of elasticity is same as that for:","choices":[{"text":"Stress","value":"A"},{"text":"Strain","value":"B"},{"text":"Velocity","value":"C"},{"text":"Surface tension","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":30927,"question":"The speed of light in vacuum is 3 x 10<sup>8</sup> ms<sup>-1</sup>.Its speed in a medium of refractive index 1.5 will be","choices":[{"text":"6.5 x 10<sup>8</sup>","value":"A"},{"text":"2 x 10<sup>8</sup> ms<sup>-1</sup>","value":"B"},{"text":"4.5 x 10<sup>8</sup> cm","value":"C"},{"text":"5.5 x 10<sup>8</sup>","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":30920,"question":"The critical angle for a ray of light suffering total internal reflection will be smallest for the ray traveling from","choices":[{"text":"Water to glass","value":"A"},{"text":"Water to air","value":"B"},{"text":"Glass to air","value":"C"},{"text":"Glass to water","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":30918,"question":"Just before &nbsp;setting the sun may appear to be elliptical This happens due to","choices":[{"text":"Diffraction","value":"A"},{"text":"Reflection","value":"B"},{"text":"Dispersion","value":"C"},{"text":"Refraction","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":30916,"question":"At what distance should a book be placed from a 50 Cd bulb so that the luminance on the book becomes 2 Im m<sup>-2</sup>","choices":[{"text":"50 m","value":"A"},{"text":"10 m","value":"B"},{"text":"5 m","value":"C"},{"text":"1 m","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":30913,"question":"Inverse square law for luminance is valid for","choices":[{"text":"Search light","value":"A"},{"text":"Isotropic point source","value":"B"},{"text":"Cylindrical source","value":"C"},{"text":"All types of sources","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":30910,"question":"If the distance of a surface from light source is doubled,then the luminance will become","choices":[{"text":"1/4 times","value":"A"},{"text":"1/2 times","value":"B"},{"text":"2 times","value":"C"},{"text":"4 times","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":30908,"question":"A beam of light enters air from water.Which of the following characteristics of light will not change in water?","choices":[{"text":"Frequency","value":"A"},{"text":"Wavelength","value":"B"},{"text":"Velocity","value":"C"},{"text":"Amplitude","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":30905,"question":"For obtaining equal and same height mirror should be","choices":[{"text":"Convex","value":"A"},{"text":"Concave","value":"B"},{"text":"Plane","value":"C"},{"text":"None","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":30903,"question":"In a astronomical telescope the final image for normal vision is formed at","choices":[{"text":"The focal of the eye piece","value":"A"},{"text":"The least distance of the distinct vision","value":"B"},{"text":"The focus of the objective lens","value":"C"},{"text":"Infinity","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":30898,"question":"If the red light is replaced by blue light illuminating the object in a microscope the resolving power of the microscope","choices":[{"text":"Decreases","value":"A"},{"text":"Increases","value":"B"},{"text":"Gets halved","value":"C"},{"text":"Remains unchanged","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":30897,"question":"Near and far points of a healthy human eye respectively are","choices":[{"text":"0 and 25 cm","value":"A"},{"text":"0 and infinity","value":"B"},{"text":"25 cm and 100 cm","value":"C"},{"text":"25 cm and infinity","value":"D"},{"text":"&nbsp;","value":"E"}],"correctAnswer":4},{"id":30895,"question":"The resolving power of telescope depends on","choices":[{"text":"Focal length of eye lens","value":"A"},{"text":"Focal length of objective lens","value":"B"},{"text":"Length of the telescope","value":"C"},{"text":"Diameter of he objective lens","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":30892,"question":"In a compound microscope the intermediate image is","choices":[{"text":"Virtual erect and magnified","value":"A"},{"text":"Real,erect and magnified","value":"B"},{"text":"Virtual,inverted and magnified","value":"C"},{"text":"Virtual,erect and reduced","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":30888,"question":"Resolving power of a telescope depends on:","choices":[{"text":"The magnification of eyepiece","value":"A"},{"text":"The focal length of objective lens","value":"B"},{"text":"Diameter of objective lens","value":"C"},{"text":"Refractive index of objective lens","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":30884,"question":"Geometrical optics cannot give following characteristics for a microscope","choices":[{"text":"Image position","value":"A"},{"text":"Image size","value":"B"},{"text":"Resolution of image","value":"C"},{"text":"Any of the above","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":30881,"question":"While viewing a distant object with a telescope suddenly a housefly sits on objective lens.The correct statement is that","choices":[{"text":"Housefly will be seen enlarged in image","value":"A"},{"text":"Housefly will be seen reduced in image","value":"B"},{"text":"Intensity of image will be decreased","value":"C"},{"text":"Intensity of image will be increased","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":30880,"question":"The astronomical telescope consists of objective and eye piece.The focal length of he objective is","choices":[{"text":"Equal to that of the eye piece","value":"A"},{"text":"Greater than that of eye piece","value":"B"},{"text":"Shorter than that of eye piece","value":"C"},{"text":"Five times shorter than that of the eye piece","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":30879,"question":"For the normal setting of a telescope","choices":[{"text":"Only the object is at infinity","value":"A"},{"text":"Only the final image is at infinity","value":"B"},{"text":"Both the object and the final image is at infinity","value":"C"},{"text":"Neither the object nor the final image has to be at infinity","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":30878,"question":"Which of the following is conserved when light waves interfere?","choices":[{"text":"Intensity","value":"A"},{"text":"Energy","value":"B"},{"text":"Amplitude","value":"C"},{"text":"Momentum","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":30877,"question":"A convex lens has focal length F.An object is placed at P then","choices":[{"text":"Image is formed at +&nbsp;∞ and is real","value":"A"},{"text":"Image is formed at +&nbsp;∞ and is virtual","value":"B"},{"text":"Image is formed at +&nbsp;∞ and is real","value":"C"},{"text":"Image is formed at + and is virtual","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":30876,"question":"Which part of the spectrum is most visible?","choices":[{"text":"Red","value":"A"},{"text":"Violet","value":"B"},{"text":"Yellow","value":"C"},{"text":"Yellow-green","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":30875,"question":"Finger prints on paper are identified by sprinkling fluorescent powder on it and observing it under","choices":[{"text":"Sun light","value":"A"},{"text":"Sodium light","value":"B"},{"text":"Infrared","value":"C"},{"text":"UV","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":30872,"question":"The image formed by an eyepiece of compound microscope is","choices":[{"text":"Real and diminished","value":"A"},{"text":"Real and enlarged","value":"B"},{"text":"Virtual and enlarged","value":"C"},{"text":"Virtual and diminished","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":30869,"question":"To get three images of a single object,one should have two plane mirrors at an angle of","choices":[{"text":"90°","value":"A"},{"text":"120°","value":"B"},{"text":"30°","value":"C"},{"text":"160°","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":30867,"question":"If red light is incident on sea water it appears","choices":[{"text":"Red","value":"A"},{"text":"Green","value":"B"},{"text":"Blue","value":"C"},{"text":"Yellow","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":30866,"question":"Which of the following colors suffers maximum deviation in a prism?","choices":[{"text":"Yellow","value":"A"},{"text":"Blue","value":"B"},{"text":"Green","value":"C"},{"text":"Orange","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":30865,"question":"A diffraction pattern is obtained using a beam of red light What will happen if the red light is replaced by blue light?","choices":[{"text":"No change","value":"A"},{"text":"Diffraction bands become narrower and crowded together","value":"B"},{"text":"Bands become broader and farther apart","value":"C"},{"text":"Bands disappear","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":30864,"question":"Soap bubble looks colored due to","choices":[{"text":"Dispersion","value":"A"},{"text":"Reflection","value":"B"},{"text":"Interference","value":"C"},{"text":"Any one of these","value":"D"},{"value":"E"}],"correctAnswer":3}]