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level: VSAQs

Questions and Answers List

level questions: VSAQs

defect of the eye where it can only see distant objects clearly. convex lens 1/f=1/D-1/dhypermetropia
defect of the eye where it can only see the nearer objects clearly. concave lens of focal length equal to the far point .myopia
the splitting for white light into seven colours on passing through a refracting medium, violet disperses moredispersion
temperature coeff of resistanceit is defined as the ratio of increase in resistance per degree centigrade rise in temperature to its resistance at 0C
gauss law for magnestismstates that no magnetic monopoles exists and that the total flux through any closed surface must be zero.
angle of declinationthe angle between the magnetic meridian and the geographical meridian
angle of inclination/angle of dipthe angle made by the total strength of the earths magnetic field with the horizontal line of magnetic meridian
lenz's lawthe direction of induced emf is such that it tends to oppose the change in magnetic flux that produced it.
faraday's law of electromagnetic inductionthe emf induced in a conducting loop is equal to the rate at which the magnetic flux in the conducting loop changes with time
power factorthe cosine of the phase angle between the voltage and current in an ac circuit. cos=R/Z
uses of IR raysmolecular structure night time photography solar cookers/heaters physiotherapy
uses of microwavesradar systems long distance com ovens
production of microwavesby special vaccum tubes like klystron, maagnetron, gunn diode
coercivityis the intensity of the magnetic field applied to reduce the magnetization to zero
retentivityit is the capability to retain magnetism after the magnetization force has been ceased
work functionthe minimum amount of energy of incident photon required to eject electrons from the surface of a photometal
photoelectric effectthe phenomenon of emission of electrons from the surface of a metal ,when a radiation of suitable frequency is incident on it
photosensitive substancesalkali metals because their work function is low
isobarssame atomic number but different atomic mass
isotopessame mass number ,diff atomic number
istonessame neutron number , different atomic number
amplifierthe device used to rise the strength of a weak signal
mobile phonespace wave com