Displaying a specific sub-category’s posts from wp_query

You can do it by manipulating the WP_Query arguments like below-

$idObj = get_category_by_slug('water-pumps-modal'); 
$args1 = array(
    'post_type' => 'post',
    /*'category_name' => 'modal',*/
    'category__in' => array( $idObj->term_id ), // Take only IDs of the categories
    'posts_per_page' => '1',
);

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