This is code for only particular category select. Category select by category id, which is used in an array and get product name, sku etc. of given category id.
$abc = array(90,102,94);
for($i=0; $i<=2; $i++)
{
$category = Mage::getModel('catalog/category')->load($abc[$i]);
$collection = $category->getProductCollection();
$collection->addAttributeToSelect('*');
$products = $collection->getItems();
foreach ($products as $product1)
{
echo $product1->getSku() . ",";
echo $category->getName() . "<br>";
}
}