Sound — Science STD 8 — Question

What does gobar gas produced from animal and plant waste contain?

Manure is a natural substance obtained from the animal and plant waste, like cow dung, human waste and plant residue. It supplies essential elements to the soil and makes it more fertile. But, it is not much helpful when a particular nutrient is required in the soil for. particular crop. Which one of the following reason given below is the possible reason for this?

The efficiency of a fuel is expressed in terms of its ________.

Whose reactivity is highest among the following metals?

Hydrogen is not considered a good fuel because it:

Which of the following appliances is based on the magnetic effect of electric current

What do black buck, elephant, python and golden cat together represent in a forest?

A coin placed in a glass of water appears raised due to which phenomenon?

Assertion (A): The resources are present in unlimited quantity in nature and are not likely to be exhausted by human activities are called Inexhaustible resources.
Reason (R): Forests, wildlife, minerals are examples Inexhaustible resources.

A lot of dry powder of one of the following chemicals can be released over a fire to extinguish it. This chemical is: