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The frequency of an alternating voltage is 50 cycles/sec and its amplitude is 120 V. Then the r.m.s. value of voltage is a) 101.3 V b) 84.8 V c) 70.7 V d) 56.5 V ...
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Phenol underset{ ext{(ii) }C{{O}_{2}}/{{140}^{o}}C}{mathop{xrightarrow{,, ext{(i) NaOH},,}}},Axrightarrow{{{ ext{H}}^{+}}/{{H}_{2}}O}Bxrightarrow{ ext{A}{{ ext{C}}_{ ext{2}}}O}C . In this reaction, the end product C is a) Sal ...
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For a cell, the terminal potential difference is 2.2 V when the circuit is open and reduces to 1.8 V, when the cell is connected across a resistance, R = 5W. The internal resistance of the cell is a) frac{{10}}{9}Omega b) fra ...
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The solution of the equation 2{x^2} + 3x - 9 le 0 is given by a) frac{3}{2} le x le 3 b) - 3 le x le frac{3}{2} c) - 3 le x le 3 d) frac{3}{2} le x le 2 ...
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The potential energy U between two molecules as a function of the distance X between them has been shown in the figure. The two molecules are *Image* a) Attracted when x lies between A and B and are repelled when X lies betwe ...
