[{"id":32326,"question":"Ordinary light has components of vibration in","choices":[{"text":"One direction","value":"A"},{"text":"Different direction","value":"B"},{"text":"All directions","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":32325,"question":"If the plane polarized light is incident on the second sheet of Polaroid, no light is emitted when their axes are","choices":[{"text":"Parallel to each other","value":"A"},{"text":"Perpendicular to each other","value":"B"},{"text":"In between two positions","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":32324,"question":"If plane polarized light is incident on the second sheet of Polaroid, the light emitted is full light when their axes are","choices":[{"text":"Parallel to each other","value":"A"},{"text":"Perpendicular to each other","value":"B"},{"text":"In between two positions","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":32323,"question":"What will be the colour of the sky as seen from the earth if there were no atmosphere ?","choices":[{"text":"Black","value":"A"},{"text":"Blue","value":"B"},{"text":"Orange","value":"C"},{"text":"Red","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":32321,"question":"Which one of the following waves cannot be polarized","choices":[{"text":"Radio waves","value":"A"},{"text":"X-rays","value":"B"},{"text":"Transverse waves in a string","value":"C"},{"text":"Longitudinal waves in a gas","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":32320,"question":"When a ray of light goes from a denser medium into a rare medium","choices":[{"text":"The wavelength of light is decreased","value":"A"},{"text":"The frequency of light increased","value":"B"},{"text":"The speed of light is increased","value":"C"},{"text":"The light undergoes a phase change of&nbsp;π","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":32318,"question":"How is the interference pattern in Young's double slit experiment affected if the sodium light is replaced by red light of the same intensity","choices":[{"text":"The fringes will vanish","value":"A"},{"text":"The fringes will become brighter","value":"B"},{"text":"The fringes will increase","value":"C"},{"text":"The fringes will decrease","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":32317,"question":"Which one of the following phenomenon cannot be explained by the wave theory of light ?","choices":[{"text":"Reflection","value":"A"},{"text":"Refraction","value":"B"},{"text":"Photoelectric effect","value":"C"},{"text":"Diffraction","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":32316,"question":"Which phenomenon of light conclusively prove that light waves are transverse waves","choices":[{"text":"Reflection","value":"A"},{"text":"Diffraction","value":"B"},{"text":"Interference","value":"C"},{"text":"Polarization","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":32314,"question":"The concentration in solution can be determined by the property known as","choices":[{"text":"Solubility","value":"A"},{"text":"Insolubility","value":"B"},{"text":"Optical activity","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":32312,"question":"The organic substances which shows optical rotation when they are in solution","choices":[{"text":"Tartaric acid","value":"A"},{"text":"Sugar","value":"B"},{"text":"Alcohol","value":"C"},{"text":"a and b","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":32310,"question":"The plane of polarization is rotated many degrees when a thickness of such crystal is","choices":[{"text":"One millimeter","value":"A"},{"text":"Less than one millimeter","value":"B"},{"text":"A few millimeter","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":32309,"question":"The typical example/examples of optically active crystals","choices":[{"text":"Quartz","value":"A"},{"text":"Crystals of sodium chlorate","value":"B"},{"text":"Crystals of sodium chloride","value":"C"},{"text":"a and b","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":32307,"question":"When a plane polarized light is passed through certain crystals they","choices":[{"text":"Are totally absorbed","value":"A"},{"text":"Are totally reflected","value":"B"},{"text":"Rotate the plane of polarization","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":32305,"question":"Sunlight is also partially polarized because of Earth's atmosphere due to scattering by","choices":[{"text":"Water vapours","value":"A"},{"text":"Air particles","value":"B"},{"text":"Dust particles","value":"C"},{"text":"All of these","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":32304,"question":"The reflected light is","choices":[{"text":"Unpolarized","value":"A"},{"text":"Polarized","value":"B"},{"text":"Partially polarized","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":32303,"question":"Glare produces when light reflects from water snow and rough road surfaces when their angle of incidence is","choices":[{"text":"Small","value":"A"},{"text":"Large","value":"B"},{"text":"Very large","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":32301,"question":"The phenomenon of polarization proves that the light waves are","choices":[{"text":"Transverse wave","value":"A"},{"text":"Longitudinal waves","value":"B"},{"text":"Stationary waves","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":32300,"question":"Commercial polarizing material is","choices":[{"text":"Colour glass","value":"A"},{"text":"Infra red glass","value":"B"},{"text":"Polaroid glass","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":32298,"question":"The dichronic substances are used in the process getting plane polarized light","choices":[{"text":"Selective absorption","value":"A"},{"text":"Refraction through crystals","value":"B"},{"text":"Reflection from different surfaces","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":32297,"question":"All possible process/processes to get plane polarized light","choices":[{"text":"Reflection from different surfaces","value":"A"},{"text":"Refraction through crystals","value":"B"},{"text":"Scattering by small particles","value":"C"},{"text":"All of these","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":32295,"question":"The polarized can be achieved by using process like","choices":[{"text":"Coherent sources","value":"A"},{"text":"Diffraction","value":"B"},{"text":"Selective absorption","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":32293,"question":"The unpolarized light is","choices":[{"text":"An ordinary incandescent bulb","value":"A"},{"text":"Sun","value":"B"},{"text":"Moon","value":"C"},{"text":"All of these","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":32292,"question":"Ordinary light has components of vibrations in all possible planes. Such light is","choices":[{"text":"Unpolarized light","value":"A"},{"text":"Polarized light","value":"B"},{"text":"Both","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":32290,"question":"The waves produced in a stretched string are called","choices":[{"text":"Stationary waves","value":"A"},{"text":"Mechanical waves","value":"B"},{"text":"Transverse mechanical waves","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":32289,"question":"X-ray diffraction has been very useful in determining structure of","choices":[{"text":"Hemoglobin","value":"A"},{"text":"Double helix structure of DNA","value":"B"},{"text":"Blood speed","value":"C"},{"text":"a and b","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":32288,"question":"2 d sin&nbsp;θ = nλ can be used to determine the","choices":[{"text":"Inter planar spacing","value":"A"},{"text":"Wavelength","value":"B"},{"text":"Incident angle","value":"C"},{"text":"All of these","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":32286,"question":"In Bragg's Equation 2d sin&nbsp;θ = nλ, where 'n' is","choices":[{"text":"Order of spectrum","value":"A"},{"text":"Number of reflections","value":"B"},{"text":"Order of reflection","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":32285,"question":"In Bragg's formula, the path difference should beam integral multiple of the wavelengths","choices":[{"text":"d sin&nbsp;θ = nλ","value":"A"},{"text":"d sin 2θ = nλ","value":"B"},{"text":"2 d sin&nbsp;θ = nλ","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":32281,"question":"According to WH Bragg and WL Bragg monochromatic beam of X-rays was reflected form a crystal plane is like a","choices":[{"text":"Smooth and regular","value":"A"},{"text":"Mirror","value":"B"},{"text":"Thin film","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":32279,"question":"The study of atomic structure of crystals by X-rays was initiated by W.H.. Bragg and W.L. Bragg in","choices":[{"text":"1920","value":"A"},{"text":"1926","value":"B"},{"text":"1910","value":"C"},{"text":"1914","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":32216,"question":"The scattering of X-rays from atoms in a crystalline lattice gives rise to","choices":[{"text":"Interference","value":"A"},{"text":"Diffraction","value":"B"},{"text":"Reflection","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":32215,"question":"The regular array of atoms in a crystal forms a natural diffraction grating of spacing typically","choices":[{"text":"≈ 10<sup>-10</sup> m","value":"A"},{"text":"≈ 10<sup>-12</sup> m","value":"B"},{"text":"≈ 10<sup>-8</sup> m","value":"C"},{"text":"≈ 10<sup>-9</sup> m","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":32212,"question":"X-rays is a type of electron magnetic radiations of much shorter wavelengths of the order of","choices":[{"text":"10<sup>-8</sup> m","value":"A"},{"text":"10<sup>-9</sup> m","value":"B"},{"text":"10<sup>-10</sup> m","value":"C"},{"text":"10<sup>-12</sup> m","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":32211,"question":"The fine rulings on a compact disc as a diffraction grating but each line is wide like","choices":[{"text":"0.01&nbsp;μm","value":"A"},{"text":"0.5&nbsp;μm","value":"B"},{"text":"0.05&nbsp;μm","value":"C"},{"text":"0.6&nbsp;μm","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":32209,"question":"In the relations d sinθ = nλ, shows that the value of&nbsp;θ depends upon 'n' so the images of different colours are much separated in","choices":[{"text":"Low orders","value":"A"},{"text":"Middle orders","value":"B"},{"text":"High order","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":32207,"question":"The relation d sinθ = nλ, where 'n' is the","choices":[{"text":"Number of bright fringes","value":"A"},{"text":"Number of dark fringes","value":"B"},{"text":"Order of the spectrum","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":32206,"question":"Zero order image formed by the grating when the angle the along the direction of normal to grating is","choices":[{"text":"Zero","value":"A"},{"text":"90<sup>o</sup>","value":"B"},{"text":"180<sup>o</sup>","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":32205,"question":"When&nbsp;θ = 0 in relation d sinθ =&nbsp;λ, the path difference between the rays coming out from the slits of the grating will be zero. So the image in this directions is","choices":[{"text":"Dark","value":"A"},{"text":"Bright","value":"B"},{"text":"Non image formed","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":32203,"question":"If the incident light contains different wavelengths the images of each wavelength for a certain value is diffracted in the","choices":[{"text":"Same directions","value":"A"},{"text":"Different direction","value":"B"},{"text":"Opposite direction","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2}]