Question 1 of 10

The force between two magnetic poles is F. If the distance between the poles and the pole strenghts is doubled, then the force experienced is:

Question 2 of 10

A spring of force constant k is cut into two pieces such that one piece is double the length of the other. The force constant of the longer piece will be

Question 3 of 10

A weak acid HX has {tex}K_a = 1 \times 10^-5 M{/tex}. It forms a salt NaX on reaction with alkali. The percentage degree of dissociation of 0.1 M solution of NaX is

Question 4 of 10

The radius of the coil which has 10 turns is 0.1m. The current required to produce a deflection of 60° (B_h = 4×10^-5T)

Question 5 of 10

In a polymer sample, 30% of molecules have a molecular mass of 20,000 40% have 30,000 and the rest 60,000. What is the weight average molecular mass of the polymer?

Question 6 of 10

Propyne is treated with sodamide and the product is treated with methyl iodide to get

Question 7 of 10

If n(A) = 4, n(B) = 3, n ( A✗ B ✗ C) = 24, then n(C) is equal to

Question 8 of 10

Standard enthalpy and standard entropy change for the oxidation of {tex}NH_3{/tex} at 298 K, are {tex}-382.64 kJ mol^{-1}{/tex} and {tex}-145.6 J mol^{-1}{/tex} respectively. Standard Gibbs energy change for the same reaction at 298 K is :

Question 9 of 10

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Question 10 of 10

Fear or exitement, generally cause one to breath rapidly and it results in the decrease of {tex}CO_2{/tex} concentration in blood. In what way will it change the pH of blood?