have_posts() function of Class Reference/WP Query is limiting access to only 5 p

Is there limit for Class Reference/WP Query… In the code below I want to display all post having values 7 to 10 for custom field ‘Relevance Scale’. Though I have several (10+) posts with values ranging from 7 to 10 for custom field ‘Relevance Scale’ the code is displaying only 5 posts. Let know the cause. FYI The code will be used on site DigitalMarketingDesk.

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<?php
//your code here!
//Display posts where the custom field key is 'Relevance_Scale' and the custom field value is '9':
$args = array(
			'meta_key'     => 'Relevance_Scale',
			'meta_value'   => array ('7','8','10'),
			// 'meta_compare' => '!=',
			//'orderby' => 'meta_value',
			);
$query = new WP_Query( $args );
// The Loop
if ( $query->have_posts() )
	{
	while ( $query->have_posts() )
		{
		$query->the_post();
		echo '<b><a href="' . get_permalink() . '">' .
			get_the_title() . '</a> </b><br/>';
				// To display Relevance Scale
		$mykey_values = get_post_custom_values( 'Relevance_Scale' );
			foreach ( $mykey_values as $key => $value )
			{
			echo " <b>Relevance Scale = " ."$value <br /> </b>";
			// To display Relevance Scale
			}
		}
	} else {
			// no posts found
			   echo "No Posts";
			}
/* Restore original Post Data */
wp_reset_postdata();
?>
</font>