Kalkal sir, there is no need to buy digi cam with 10-15 Megapixels; any camera with 6-8 mega pixels will be more than enough for normal 'balaka ke photos'. Only if you want to print some big poster size photographs, 15 MP camera is useful. For the purpose u mentioned, it will be total waste of money.
Regarding zoom: i hope u are talking about 'optical zoom'. 'Digital zoom' is useless..
Canon has very good 'point and shoot' cameras. my suggestion would be any of these models:
Canon SX 100IS: 8 MP, 10X optical zoom; (if still available in market) (price was arnd 14000 Rs. with all
normal accessories one year back
or
Canon SX 110IS: 9MP, 10X optical zoom;
or their newest cousin:
Canon SX 120IS: 10MP, 10X optical zoom; (price is around 14500 Rs.)
In gray market (without bill), u can buy these 2000 lesser.
You may visit the following website for a proper review of the camera u r planning to buy
http://www.digitalcamerareview.com/