Step 1: Picture the Revaluation Account.
Losses go on the debit side and gains on the credit side. The balance of the account shows profit or loss.
Step 2: Fill the debit side.
Decrease in Patents is $11{,}000 - 8{,}000 = 3{,}000$. Decrease in Machinery is $30{,}000 - 28{,}000 = 2{,}000$. Debit side total is $3{,}000 + 2{,}000 = 5{,}000$.
Step 3: Fill the credit side.
Increase in Buildings is $25{,}000 - 20{,}000 = 5{,}000$. Credit side total is Rs 5,000.
Step 4: Find the balance.
Both sides are equal at Rs 5,000. So the account balances by itself with nothing left to transfer to the partners' capital accounts.
Step 5: Conclude.
The revaluation gives no profit and no loss.
\[ \boxed{\text{No profit, no loss}} \]
Final Answer:
The revaluation has no profit and no loss.