i attempted to find this out however i can't until know

i've new custom publish kind of questions and that i produce other publish types like job listing, resumes etc

things i want here to create look for the publish type questions only here things i done

            <?php global $app_abbr, $header_search; $header_search = true; ?>
            <?php get_header(); ?>

                <form action="<?php bloginfo('url'); ?>/" method="get" id="searchform">

                    <div class="search-wrap">

                            <input type="hidden" name="questions_search" value="true" />
                            <input type="hidden" name="post_type" value="questions" />              
                            <input type="text" id="search" title="" name="s" class="text" placeholder="<?php _e('All Questions and answers'); ?>" value="<?php if (isset($_GET['s'])) echo get_search_query(); ?>" />
                            <label for="search"><button type="submit" title="<?php _e('Go'); ?>" class="submit"><?php _e('Go'); ?></button></label>


                    </div><!-- end search-wrap -->


and also the search page

                global $wp_query, $query_string;

                $term_heading = '';
                $find_posts_in = '';

                $search = get_search_query();

                if ($search) :
                    $term_heading = sprintf( __('Searching  for Questions &ldquo;%s&rdquo; '), get_search_query());
                else :
                    $term_heading = __('Searching  ');

                if (is_array($find_posts_in)) :
                    $args = array_merge( $wp_query->query,
                            'post_type' => 'questions',
                            'post__in' => $find_posts_in
                else :
                     $args = array_merge( $wp_query->query,
                            'post_type' => 'questions'
                query_posts( $args );