Soil fertility is determined by its ability to:

At the time of short circuit, the electric current in the circuit:

A. vary continuously B. does not change

C. reduces substantially D. increase heavily

OR

Two bulbs of 100 W and 40 W are connected in series. The current through the 100 W bulb is 1 A. The current through the 40 W bulb will be:

A. 0.4 A B. 0.6 A

C. 0.8 A D. 1 A

In an ecosystem, 10% of energy available for transfer from the trophic level to the next is in the form of:

Assertion (A): In a homologous series of alcohols, the formula for the second member is C₂H₅OH and the third member is C₃H₇OH.

Reason (R): The difference between the molecular masses of the two consecutive members of a homologous series is 144.

Assertion (A): In the process of nuclear fission, the amount of nuclear energy generated by the fission of an atom of uranium is so tremendous that it produces 10 million times the energy produced by the combustion of an atom of carbon from coal.

Reason (R): The nucleus of a heavy atom such as uranium, when bombarded with low energy neutrons splits apart into lighter nuclei. The mass difference between the original nucleus and the product nuclei gets converted to tremendous energy.