Explain what will happen if in a cultivated field only manures are supplied and in another field only fertilizers are supplied, keeping all other conditions similar.

The figure shows two crop fields (plots A and B) have been treated by manures and chemical fertilizers, respectively, keeping other environment factors same. Observe the graph and answer the following question: (i) Why does plot B shows sudden increase and then gradual decrease in yield ? (ii) Why is the highest peak in plot A graph slightly delayed? (iii) What is the reason for the different pattern of the two graphs.

In an experiment demonstrating the evolution of oxygen in Hydrilla, sodium bicarbonate is added to water in the experimental set-up. What would happen if all other conditions are favourable.

In moving coil galvnometer a current f 2A for radial magnetic field of 4xx 10^(-3) Wb/m^(2) produces some deflection. FI the field is doubled by keeping all other quantities same, the current for the same deflection will be

A parallel plate capacitor with air between its plates having palte area of 6xx10^(-3)m^(2) and separation between them 3 mm is connected to a 100 V supply. Calculate charge on each plate of the capacitor. Explain what would happen when a 3 mm thick mica sheet (dielectric constant=6) is inserted between the plates, (i) while the voltage supply remains conected, (ii) after the supply is disconnected.

A charge particle q of mass is placed at a distance d from another charge particle -2q of mass 2 m in a uniform magnetic field B as shown if particle are projected towareds each other with equal speed v_(0) , so that the two particle touches each other without collision during its motion (Assume only force due to magnetic field acts on the particle)