add new questions for HTML and MongoDB #1502 (#1503)

* add new questions for HTML #1502 * add and update mongodb questions
Ebazhanov · Apr 30, 2021 · 49a1fb6 · 49a1fb6
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diff --git a/html/html-quiz.md b/html/html-quiz.md
@@ -1029,3 +1029,92 @@ From [MDN](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/hr): The HT
 - [ ] It has child content but no closing tag.
 
 [Reference (MDN Web Docs)](https://developer.mozilla.org/en-US/docs/Glossary/Empty_element)
+
+#### Q67. What is the purpose of async in this code? 
+
+`<script async src="myscript.js"></script>`
+
+- [ ] It downloads the script from the server when resources allow.
+- [ ] It runs the script after HTML parsing is complete.
+- [x] It runs the script when the script is ready.
+- [ ] It pauses the parsing of HTML code while the script runs.
+
+#### Q68. What does this code?
+`<audio autoplay loop src="sound.mp3" type="audio/mpeg"></audio>`
+- [ ] When the **play** button is pressed, the browser playes the sounds over and over again until the user stops it.
+- [x] The browser plays the sound once automatically in the background. The user has no control over the sound.
+- [ ] The browser plays the sound automatically and continuously in the background. The user may stop the sound at any tune.
+- [ ] The browser plays the sound automatically and continuously in the background. The user has no control over the sound.
+
+#### Q69. What is the difference between the `<head>` and `<header>` tags?
+
+- [ ] There is only one `<head>` tag per page, while there may be many `<header>` tags.
+- [ ] The `<head>` tag may contain CSS and Javascript links, while the `<header>` tag may contain headings and navigational links.
+- [x] all of these answers
+- [ ] The `<head>` tag contains meta information, while the `<header>` tag contains navigation, logos, and other page identifying content.
+
+#### Q70. In this code, what is the purpose of defer?
+
+`<script defer src="myscript.js"></script>`
+
+- [ ] It downloads the script from the server when resources allow.
+- [X] It runs the script after HTML parsing is complete.
+- [ ] It runs the script when the script is ready.
+- [ ] It pauses the parsing of HTML code while the script runs.
+
+#### Q71. The code below contains some errors. Which choice corrects all of the errors?
+
+```html
+<table>
+  <tr>Cell 1</tr>
+  <td>Cell 2</td>
+  <caption>A table</caption>
+</table>
+```
+- [ ]
+
+```HTML
+<caption>A table</caption>
+  <table>
+    <td>
+      <tr>Cell 1</tr>
+      <tr>Cell 2</tr>
+    </td>
+  </table>
+```
+
+- [ ]
+
+```HTML
+<caption>A table</caption>
+<table>
+  <tr>
+    <td>Cell 1</td>
+    <td>Cell 2</td>
+  </tr>
+</table>
+```
+
+- [X]
+
+```HTML
+<table>
+  <caption>A table</caption>
+  <tr>
+    <td>Cell 1</td>
+    <td>Cell 2</td>
+  </tr>
+</table>
+```
+
+- [ ]
+
+```HTML
+<table>
+  <tr>
+    <td>Cell 1</td>
+    <td>Cell 2</td>
+  </tr>
+  <caption>A table</caption>
+</table>
+```
diff --git a/mongodb/mongodb-quiz.md b/mongodb/mongodb-quiz.md
@@ -105,7 +105,7 @@
 - [ ] It holds a backup copy of the database.
 - [ ] It reboots the failed server.
 
-#### Q16. You would like to know how many types of items you have in each category. Which query does this?
+#### Q16. You want to know how many types of items you have in each category. Which query does this?
 
 - [ ] `db.product.group({_id: "$category", count: {$sum:1}})`
 - [ ] `db.product.aggregate($sum: {_id: "$category", count: {$group:1}})`
@@ -119,7 +119,7 @@
 - [ ] max
 - [ ] skip
 
-#### Q18. We have a collection named restaurants with the geographical information stored in the location property, how do you create a geospatial index on it?
+#### Q18. You have a collection named restaurants with the geographical information stored in the location property, how do you create a geospatial index on it?
 
 - [x] `db.restaurants.CreateIndex({location: "2dsphere"})`
 - [ ] `db.restaurants.geospatial({location: "2dsphere"})`
@@ -259,7 +259,7 @@
 - [ ] `db.vehicle.stats(true)`
 - [ ] `db.vehicle.stats("kb")`
 
-#### Q38. You'd like to modify an existing index. What is the best way to do this?
+#### Q38. You want to modify an existing index. What is the best way to do this?
 
 - [ ] Use the `reIndex()` command to modify the index.
 - [x] Delete the original index and create a new index.
@@ -433,3 +433,23 @@
 - [ ] `The oplog is capped collection and can't run out of memory`
 - [ ] `The MongoDB instance will fail`
 - [ ] `The oplog will stop recording logging information`
+
+#### Q63. MongoDB ships with a variety of files. Which file runs the MongoDB shell?
+
+- [X] mongo
+
+- [ ] mongo-s
+
+- [ ] shell
+
+- [ ] mongo-shell
+
+#### Q64. How can you view the execution performance statistics for a query?
+
+- [ ] `db.performance.members.aggregate([ {$match: {gender: "Female"}}, {$group: {_id:{city:"$city"}, number: {$sum: 1}}}, {$sort : {number: -1}}])`
+
+- [ ] `db.members.aggregate([ {$match: {gender: "Female"}}, {$group: {_id: {city: "$city"}, number:{$sum:1}}}, {$sort: {number:-1}}]).explain("executionStats")`
+
+- [ ] `db.members.aggregate([ {$match: {gender: "Female"}}, {$group:{_id: {city: "$city"}, number: {$sum: 1}}}, {$sort: {number: -1}}]).explain()`
+
+- [ ] `db.members.aggregate([ {$match: {gender: """Female"""}}, {$group: {_id: {city: """$city"""}, number: {$sum:1}}}, {$sort: {number: -1}}]).number()`