A filament bulb ( ( 500 \mathrm {~W} , 100 \mathrm {~V} ) ) is to be used in a 230 V main supply. When a resistance ( R ) is connected in series, it works perfectly and the bulb consumes 500 W . The value of ( R ) is

The highest DDT concentration in aquatic food chain shall occur in

In Hardy-Weinberg equation, the frequency of heterozygous individuals is represented by

Which of the following biomolecules is common to respiration mediated breakdown of fats, carbohydrates and proteins?

The correct corresponding order of names of following aldoses with configuration given below respectively, is

The correct geometry and hybridization for XeF4 are :

\( \mathrm { AlF } { 3 } \) is soluble in HF only in presence of KF . It is due to the formation of

The number of electrons delivered at the cathode during electrolysis by a current of 1 ampere in 60 seconds is (charge…

The solubility of \( \mathrm { AgCl } { ( \mathrm { s } ) } \) with solubility product \( 1.6 \times 10 ^ { - 10 } \) i…

In calcium fluoride, having the fluorite structure, the coordination numbers for calcium ion \( \left( \mathrm { Ca } ^…

The coagulation values in millimoles per litre of the electrolytes used for the coagulation of \( \mathrm { As } { 2 }…