Multiple unrelated businesses - new pvt. ltd.co..

I applied to register a company a few months back, and it finally got incorporated 3 days back. My Company Secretary told me that I had to keep the activity of the business in it's name, so my company is named

XYZ Manufacturing Solutions Private Limited.

I intend to manufacture small goods and electrical items, but I'd also like to start a few online, technology related businesses. The shareholders/directors will be the same.

My Company Secretary told me that I would have to register a separate company if I wanted to do an additional unrelated business. Is this true?

Thank you for reading, and for your responses, if any.