Naval Viswanathan (Securities Broker)

BNA means Bulk Note Acceptor. It is the cash deposit machine.

Axis Bank gives some free cash deposits in machine every month. If you deposit cash more times than the free limit, the bank will take a small fee. This fee is the BNA charge. For savings account, it is mostly free for first 4 deposits or up to Rs 1.5 lakh. After that, they charge about Rs 5 for every Rs 1000. You should check the bank website for exact charges.

That's an interesting one. The most common and widely accepted collective noun is a 'string of pearls'. This is what you would hear most often, particularly when they're arranged as jewellery. You could also correctly say 'a rope of pearls', which usually suggests a much longer or more lavish necklace. So, while 'string' is the classic answer, 'rope' is a perfectly good alternative depending on the specific arrangement of the pearls. Both are quite correct.

Hydrogenation is a chemical reaction where you add hydrogen to a molecule. Pretty straightforward, yeah? You’re basically ‘saturating’ an organic compound, often using a metal catalyst like nickel to speed things up. It’s a way of turning unsaturated fats (like liquid oils) into saturated fats (like solid fats).

As for its industrial use, it's huge. The most common example is in the food industry. It’s the process used to make margarine and shortening from vegetable oils, which improves their shelf life and texture. It's also massive in the petrochemical world. Refineries use hydrogenation to upgrade crude oil into cleaner fuels like petrol and diesel by removing impurities like sulphur. So, it's vital for both food and fuel.