Carbon and its Compounds — Science STD 10 — Question

What is the electronic definition of Oxidation and Reduction?

What condition is necessary for the production of current by electromagnetic induction?

Which animal is referred to as friend of farmers?

Which product of the nuclear fission of uranium-235 is utilised to cause further fission of its nuclei?

Besides gallium, which two other elements have since been discovered for which Mendeleev had left gaps in his periodic table?

Write the functions of the following: Calyx.

Name one animal and one plant whose stings contain formic acid (or methanoic acid).

Name the agent which decomposes animal dung into biogas.

Arrange the following fuels in the order of decreasing calorific values (keeping the fuel with highest calorific value first): Biogas, Kerosene, Wood, Petrol, Hydrogen gas, Methane

Which of the two is more energy efficient: filament type electric bulb or CFL? Why?