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(a) state the main points of difference between homogenous and hetergeneous mixtures. ( B) Classify the following materials as homogeneous mixtue and hetergeneous mixtures: soda -water , wood ,Air , soil , Vinegar ,Alcohol and water mixtue , petrol and water mixture ,Chalk and water mixture,sugar and water mixture , copper sulphate solution .

A man walked at a speed of 4km/hr from point A to B and came back from point B to A at the speed of 6km/hr .what would be the ratio of the time taken by the main walking from point a to B to that from point B to A?

Find potential difference between points A and B of the network shown in fig. and distribution of given main current through different resistors.

Supposing the ionization energy of hydrogen atom is 640 eV. Point out the main shell having energy equal to – 40 eV -