Drupal 7. Quiz module. Add programality new questions to quiz.

cba_quiz.module

/**
 * Create new multichoice questions.
 */
function cba_quiz_new_multichoice_question() {
  global $user;

  $question = new stdClass();
  $question->title = t('Questions template');
  $question->type = 'multichoice';
  $question->body = array(LANGUAGE_NONE => array(array('value' => t('Your  questions text'))));
  $question->choice_multi = 0;
  $question->choice_random = 0;
  $question->choice_boolean = 0;
  $question->language = LANGUAGE_NONE;
  $question->uid = $user->uid;
  $question->status = 1;
  $question->alternatives = cba_quiz_return_default_answers();

  node_object_prepare($question);
  $question = node_submit($question);
  node_save($question);

  $edit_questions_url = "node/{$question->nid}/edit";
  $url_options = array('query' => array('destination' => 'manage/quizzes'));

  drupal_goto($edit_questions_url, $url_options);
}


/**
 * Default answers settings form.
 */
function cba_quiz_default_answers($form, &$form_state) {
  $answer_description = t('Enter one answer per line');

  $form = array();
  $form['invoice']['cba_quiz_default_answers'] = array(
    '#type' => 'textarea',
    '#title' => t('Default answers list'),
    '#description' => $answer_description,
    '#default_value' => variable_get('cba_quiz_default_answers', ''),
  );

  return system_settings_form($form);
}

/**
 * Return defaults answers list for question.
 *
 * @return array $answers_list
 */
function cba_quiz_return_default_answers() {
  $answers_list = array();
  $default_answers = variable_get('cba_quiz_default_answers', '');

  if ($default_answers) {
    $default_answers = explode("\r\n", $default_answers);

    foreach ($default_answers as $answer_text) {
      $answers_list[] = cba_quiz_return_answer_array($answer_text);
    }
  }

  return $answers_list;
}

/**
 * Return answer render array.
 *
 * @param string $answer_text
 * @return array $answer
 */
function cba_quiz_return_answer_array($answer_text) {
  $answer = array(
    'answer' => array(
      'value' => $answer_text,
      'format' => 'plain_text',
    ),
    'feedback_if_chosen' => array(
      'format' => 'plain_text',
      'value' => '',
    ),
    'feedback_if_not_chosen' => array(
      'format' => 'plain_text',
      'value' => '',
    ),
    'score_if_chosen' => 0,
  );

  return $answer;
}