It has been tried again and again. (Identify the correct Active Voice of the above sentence from the given options and rewrite.)
In active voice, the subject performs the action. The given sentence is in the passive voice with present perfect tense ("has been tried"). The correct transformation retains the present perfect tense while making the subject explicit, which is achieved in Option (d).
Derive an expression for maximum speed of a vehicle moving along a horizontal circular track.
Predict the type of cubic lattice of a solid element having edge length of 400 pm and density of 6.25 g/ml.
(Atomic mass of element = 60)