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A newly planted sapling usually grows and matures into a tree in more than:
A sapling is a tree seedling that has grown sufficiently to be planted in a Tree Patch.
An example of a renewable sources of energy is :
A non-renewable sources of energy is:
Which of the following is not a renewable sources of energy?
A good fuel is one which process :
The fuel having a calorific value of 55 kJ/g is likely to be :
Which of the following fuels has the high calorific value ?
The fuel having the lowest calorific value is?
There are four fuels which all contain only carbon and hydrogen. The fuel having highest calorific value will be one which has:
One of the following is not a characteristic of a good fuel. This is:
Which of the following is not a fossil fuel?