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(i) Lead balls are spherical in shape.
(ii) Rain leaves and a globule of mercury placed on glass plate are spherical.
(iii) Hair of shaving painting brush, when goes in water spread out, but as soon as it is taken out. Its fur sticks together.
(iv) A greased needle saved gently on the free surface of water in a beaker does not sink.
(v) Likewise, insects may go on the free area of water without drowning.
(vi)Bits of computer gum go irregularly when engaged on water surface.
The mass of 1 mole of electrons is: (1) 9.1x 10 -28 g (2) 1.008mg (3) 0.55mg (4) 9.1x 10 -27 g Ans: (3)0.55mg
what are the 15 major muscles in the body?
Consider an x-ray tube in which electrons are accelerated by a constant high voltage of 250 kV. If the electron beam current is 10 mA, calculate the x-ray energy flux (energy fluen
Commutator: The commutator is a form of rotating switch placed among the armature and external circuit and so arranged that it will reverse the link with the external circuit a
What is the best means of solving a vector problem? By using 2 or 3 Cartesian coordinates?
(i) On the average, particles are separated by a distance of the order of 10-10 m and exert a force of attraction of the order of 10-11 N on each other. (ii) The force of atta
Diesel and Flat Car The animation below portrays the inelastic collision among a extremely massive diesel and a less massive flatcar. Previous to the collision, the diesel is i
Illustrates the quantum theory of black body radiation by Planck? Planck’s quantum theory of black body radiation Planck was investigating the properties of light-emitting a
why is the sky blue?
Mention two salient features of immunity theory of ageing. Write the full form of ESR. What does the increase in ESR indicate?
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