601 In multimode step index fibre the refractive index of core and cladding is____________? Physics Medium Full question → A same B different C zero D different with refractive index of core higher than cladding
602 A convex lens of focal length f1 and a concave lens of focal length f2 are placed in contact. The focal length of the combination is_____________? Physics Medium Full question → A f2 + f1 B f2 – f1 C f1f2/f2+f1 D f1f2/f1-f2
603 If a convex lens of large aperture fails to converge the light rays incident on it to a single point, it is said to suffer from______________? Physics Medium Full question → A chromatic aberration B spherical aberration C both spherical and chromatic D distortion
604 The least distance of distinct vision for a normal eye is_______________? Physics Medium Full question → A 15 cm B 25 cm C 30 cm D 40 cm
605 Magnifying power of simple microscope______________? Physics Medium Full question → A increase with increase in focal length B increase with decrease in focal length C no effect with decrease or increase with focal length D list distance of distinct vision
606 If an object is placed away from 2f of a converging lens then the image will be_______________? Physics Medium Full question → A real and erect B virtual and erect C real and inverted D virtual
607 The power of a concave lens is_______________? Physics Medium Full question → A real B virtual C positive D negative
608 Unit of power of a lens is________________? Physics Medium Full question → A meter B watt C diopter D horsepower
609 The diameter of a lens is called________________? Physics Medium Full question → A focal length B principal axis C aperture D radius of curvature
610 A lens which converges a beam of parallel rays to a point is called______________? Physics Medium Full question → A diverging (or concave) lens B converging (or convex) lens C plano concave lens D plano convex lens
611 Electron moves in the orbit as________________? Physics Medium Full question → A Simple vibratory motion B Standing wave motion C Vibratory motion like up and down D S.H.M likes the sound
612 Compton effect proves the________________? Physics Medium Full question → A Photon theory of light B Dual nature of light C Wave nature of light D Uncertain nature of light
613 The energy radiated is directly proportional to the fourth power of Kelvins temperature is________________? Physics Medium Full question → A Karl-Weins law B Rayleigh-Jeans law C Stephens law D Plancks
614 For confinement of electron in a box of radius 10-14m the electron, speed should be_____________? Physics Medium Full question → A 107m/sec B Should be greater than the speed of light. C Be zero D Not be wave-like
615 The uncertainty in momentum & position is due to its_____________? Physics Medium Full question → A Property of matter and radiation B Two-dimensional motion C Emission of the certain wavelength D Very high velocity
616 A three-dimensional image is obtained by________________? Physics Medium Full question → A Electron microscope B Scanning electron microscope C Magnetic imaging D None of the above
617 In the electron microscope, electric & magnetic fields are used as_______________? Physics Medium Full question → A Electromagnetic gun B Source of electromagnetic waves C Deflecting charged particle D Converging source of electrons
618 In an electron microscope, we use energetic particles because of______________? Physics Medium Full question → A Penetrating power is high B Kinetic energy is large C Wavelength is very short D All the above reasons
619 If a diffraction grating is placed in the path of a light beam it reveals______________? Physics Medium Full question → A Wave property B Particle property C Energy particle D Electromagnetic wave property
620 In Davisson-Germer experiment the diffracted proton from crystal shows______________? Physics Medium Full question → A Particle property B Wave property C Light property D Quantum property