[{"id":227451,"question":"The crystalline structure of NaCl is.","choices":[{"text":"Cubical","value":"A"},{"text":"Hexagonal","value":"B"},{"text":"Tri gonal","value":"C"},{"text":"Tetragonal","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":227450,"question":"The number of crystal system are","choices":[{"text":"Three","value":"A"},{"text":"Five","value":"B"},{"text":"Seven","value":"C"},{"text":"Fifteen","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":227449,"question":"There are different crystal systems. The number of these crystal system is.","choices":[{"text":"3","value":"A"},{"text":"4","value":"B"},{"text":"5","value":"C"},{"text":"7","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":227448,"question":"Which one of the following is crystalline solid.","choices":[{"text":"Zirconia","value":"A"},{"text":"Glassy solid","value":"B"},{"text":"Natural rubber","value":"C"},{"text":"Poly strene","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":227447,"question":"Which one is not a crystalline solid.","choices":[{"text":"Zinc","value":"A"},{"text":"Copper","value":"B"},{"text":"Nylon","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":178171,"question":"A cable breaks if stretched by more than 2mm. It is cut into two equal parts. How much either part can be stretched without breaking?","choices":[{"text":"25 m","value":"A"},{"text":"1mm","value":"B"},{"text":"2mm","value":"C"},{"text":"0.5 m","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":178170,"question":"Curie temperature is a point where :","choices":[{"text":"Diamagnetism changes to paramagnetism","value":"A"},{"text":"Paramagnetism changes to Diamagnetism","value":"B"},{"text":"Ferromagnetism changes to paramagnetism","value":"C"},{"text":"Paramagnetism changes to Ferromagnetism","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":178169,"question":"If both the length and radius of the rod are doubled, then the modulus of elasticity will:","choices":[{"text":"Increase","value":"A"},{"text":"Decrease","value":"B"},{"text":"Remains the same","value":"C"},{"text":"Doubled","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":178168,"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 elasticity","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":178167,"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 elasticity","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":178166,"question":"A wire stretched to double of its length, its strain is:","choices":[{"text":"2","value":"A"},{"text":"1","value":"B"},{"text":"0","value":"C"},{"text":"0.5","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":60293,"question":"Recently superconductor discovered is at temperature.","choices":[{"text":"110K","value":"A"},{"text":"143K","value":"B"},{"text":"16.3K","value":"C"},{"text":"119K","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":60292,"question":"The first superconductor was discovered in:","choices":[{"text":"1831","value":"A"},{"text":"1911","value":"B"},{"text":"1921","value":"C"},{"text":"1876","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":60291,"question":"Those materials whose resistivity becomes zero at certain temperature is called:","choices":[{"text":"Semiconductor","value":"A"},{"text":"Super conductor ","value":"B"},{"text":"Conductor","value":"C"},{"text":"Insulator","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":60290,"question":"Insulators have:","choices":[{"text":"An empty conduction band","value":"A"},{"text":"Al full valence band","value":"B"},{"text":"A large energy gap","value":"C"},{"text":"All of above","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":60289,"question":"A semiconductor in its extremely pure form is known as:","choices":[{"text":"Intrinsic","value":"A"},{"text":"Extrinsic","value":"B"},{"text":"Both a and b","value":"C"},{"text":"None of above","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":60288,"question":"The temperature at which, semiconductor behaves as insulators:","choices":[{"text":"10k","value":"A"},{"text":"0k","value":"B"},{"text":"237k","value":"C"},{"text":"None of above","value":"D"},{"value":"E"}],"correctAnswer":2}]