List the activities that a farmer has to perform to produce crops.

The metal A lies above B in the activity series of metals. Which one has higher reducing property?

A manufacturer has three machine operators A, B and C. The first operator A produces 1% defective items, where as the other two operators B and C produce 5% and 7% defective items respectively. A is on the job for 50% of the time, B is on the job for 30% of the time and C is on the job for 20% of the time. A defective item is produced, what is the probability that it was produced by A?

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(Allocation problem) A cooperative society of farmers has 50 hectare of land to grow two crops X and Y. The profit from crops X and Y per hectare are estimated as rs. 10,500 and Rs. 9,000 respectively. To control weeds, a liquid herbicide has to be used for crops X and Y at rates of 20 litres and 10 litres pre hectare. Further, no more than 800 litres of herbicide should be used in order to protect fish and wild life using a pond which collects drainage from this land. How much land should be allocated to each crop so as to maximise the total profit of the society?

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A farmer has a field in the form of a parallelogram PQRS as shown in the figure. He took the mid- point A on RS and joined it to points P and Q. In how many parts of field is divided? What are the shapes of these parts ? The farmer wants to sow groundnuts which are equal to the sum of pulses and paddy. How should he sow? State reasons?

A regularity gene produces some kind of protein through its m-RNA that controls the activity of the operator gene which signals the fomation of specific enzyme required for the metabolic breakdown of the food. How does that protein regulate the activity of the operator gene?

This question has Statement I and Statement II. Of four choices given after the Statements choose the one that best describes two statements Statement-I : If the activation energy of a reaction is zero, the rate constant becomes independent of the temperature. Statement-II : Lower the activation energy, faster is the reaction.

The diameters of the larger and the smaller pistons of a hydraulic press are 45 cm and 5 cm respectively. Find the magnitude of the force that has to be applied on the smaller piston to produce a 4050 N thrust on the larger piston.