Voice
He was congratulated by his teacher on his brilliant success in the recent examination.

He congratulated his teacher on his brilliant success in the examination.
His teacher congratulated him on his brilliant success in the examination.
His teacher congratulated him for his brilliant success in the recent examination.
His teacher congratulated him.

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Voice
James Watt discovered the energy of steam.

James Watt was discovered by the energy of steam.
The energy of steam discovered James Watt.
The energy of steam was discovered by James Watt.
James Watt had discovered energy by the steam.

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Voice
In the following question, a sentence has been given in Active/Passive Voice. Out of the four/five alternatives suggested, select the one which best expresses the same sentence in Passive/Active Voice. The packet has not been opened by anyone.

No one has opened the packet.
Anyone has not opened the packet.
No one has been opening the packet.
No one has not opened the packet.

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