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Q. What are secondary cells? Give an example?
i) They are rechargeable.
ii) The chemical reactions which take place in secondary cells are reversible.
iii) The active materials which are used up when the cell delivers current can be reproduced by passing current through the cell in opposite direction. Instance lead acid accumulator and alkali accumulator.
A hiker tosses a rock into a canyon. He hears it strike water 4.78 s later. How far down is the surface of the water?
Why is the mass of a nucleus always less than the sum of the masses of its constituents, neutrons and protons? If the total number of neutrons and protons in a nuclear reaction
Definition: The electric field in a region is shown by continues lines (also known as lines of force). Field line is an imaginary line along which a positive test charge will move
a) Here temperature difference of junction is used to produce thermo e.m.f. and vice-versa. b) This effect produced when junctions of a thermocouple are kept at dissimilar tempe
'To and Fro' type of motion is known as an Oscillatory Motion. It needed not be periodic and needed not have fixed extreme positions. The force/torque acting in oscillatory moti
Define Hole in Wall (Princeton)? A container is separated into two parts I and II by a partition with a small hole of diameter d Helium gas in the two parts is held at temper
Questions: A source charge generates an electric field to exist in the region of space around that source charge. The electric field exerts a force on some test charge that fin
Can you explain modulation? Why is it required? What is "World Wide Web" (WWW)? Give the frequency range of speech signals.
explain in detail the construction and working of a scientillation counter
what is the speed of light
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