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the ratio of specific charge of a proton and an alfa-particle is1 2 12 1 23 1 44 1 1ans1 2
the mass of 1 mole of electrons is1 91x 10-28g2 1008mg3 055mg4 91x 10-27gans
the average distance of an electron in an atom from its nucleus is of the order of1 106m2 10-6m3 10-10m410-15mans 3
the mass of a mol of proton and electron is1 6023x 1023 g2 1008g and 055mg3 91x 10-28kg 4 2gmans 2 1008g and
one would expect proton to have very large1 ionization potential2 radius3 charge4 hydration energyans4 hydration
the nature of anode rays depends upon1 nature of electrode2 nature of residual gas3 nature of discharge tube4 all the aboveans2 nature of residual
the minimum real charge on any particle which can exist is116x 10-19 coulomb2 16x 10-10 coulomb348 x 10-10 coulomb4zeroans 116x 10-19
proton was discovered by1chadwick2thomson3goldstein4bohrans
which one of the following pairs is not correctly matched1 rutherford-proton2 jj thomsom-electron3 jh chadwick-neutron4
demonstrating the cause of the phases of the moonplace a lighted candle or electric lamp on a table in a darkened room paint an 8 cm rubber ball
demonstrating how the angle of the suns rays changes from day to day at the same hourcut a 1-cm round hole in a piece of paper or cardboard place
making a shadow stickin an open space on the school ground drive a 130 cm stick into the ground and let the children stay a record of the length of
demonstrating the effects of the angle of the suns rays on the quantity of heat and light received by the earth bend a piece of cardboard and make a
demonstrating the cause of difference in length of day and night in some places-use the similar apparatus as in 6 above mark a circle on the ball
which phrase would be incorrect to use1a molecular of a compound 2a molecule of an element3an atom of an element4none of theseans 2a molecule
a simple model of the earth and moonthe earth can be shown by an orange or other round object stuck on a piece of bamboo or a meat skewer a piece of
making a sun-dialto withstand all weather a sun-dial should be form of metal or painted wood a cardboard model can be formed for easy
the size of nucleus is measured in1amu2angstrom3fermi4cmans
cathode rays have1mass only2charge only3no mass and charge4mass and charge bothans4mass and charge
neutron is a fundamental particle carrying1a charge of 1 unit and a mass of 1 unit 2no charge and a mass of 1 unit3no charge and no mass4
a foucault pendulum to show the rotation of the eartha g-clamp with a ball bearing soldered to the inside of the jaw makes a excellent support
neutron possesses1positive charge2negative charge3no charge4all are correctans 3no
sliding versus static frictionfriction force is the force exert by a surface as an object moves crosswise it or makes an effort to move across it two
the radius of an atom is of the order of1 10-10cm2 10-13 cm3 10-15cm4 10-8cmans
explain spring force fspringforce exerted by a compressed or stretched spring upon any object that attached to it an object that compresses or