The correct option is A 2
When the weights on both pans are equal, the beam of a balance balances.
∴ When we place the sack of rice weighing 1 kg on one pan of the balance, the weight on the other pan should also be 1 kg for the beam to balance.
We know that 1 kg=1000 g.
∴ We need 1000500=2 weights of 500 grams to each on the other pan.