JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 364 · 40 questions

Code tip (Line by line): let x = 5; makes a variable x holding 5; x = x + 2; changes it to 7. console.log(…) writes in the console; alert(…) shows a pop-up box. Text in quotes + anything = joined text: "5" + 3 → "53".

1. 1.⚡ Which JavaScript word writes in the console? (a) let (b) for (c) if (d) console.log()
2. 2.⚡ What number does this code print?
   let a = 11;
   let b = 3;
   console.log(a * b);
3. 3.⚡ What number does this code print?
   let books = 14;
   books = books + 11;
   books = books - 4;
   console.log(books);
4. 4.⚡ Which JavaScript word shows a pop-up box? (a) for (b) let (c) alert() (d) if
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 9;
   console.log(x + y); (a) 59 (b) 14 (c) Error
6. 6.⚡ Which JavaScript word runs code when true? (a) let (b) console.log() (c) for (d) if
7. 7.⚡ Which JavaScript word makes a new variable? (a) alert() (b) for (c) console.log() (d) let
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 5;
   console.log(x + y); (a) 95 (b) Error (c) 14
9. 9.⚡ What number does this code print?
   let a = 38;
   let b = 21;
   console.log(a + b);
10. 10.⚡ Which word makes a new variable? (a) make (b) let (c) give (d) put
11. 11.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Hi, Meera! (b) Meera (c) Hi, name! (d) name
12. 12.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Zoya (d) Hi, Zoya!
13. 13.⚡ What number does this code print?
    let marks = 27;
    marks = marks + 17;
    marks = marks - 21;
    console.log(marks);
14. 14.⚡ What number does this code print?
    let a = 44;
    let b = 3;
    console.log(a - b);
15. 15.⚡ What number does this code print?
    let a = 5;
    let b = 8;
    console.log(a * b);
16. 16.⚡ What number does this code print?
    let apples = 11;
    apples = apples + 9;
    apples = apples - 15;
    console.log(apples);
17. 17.⚡ What number does this code print?
    let books = 21;
    books = books + 4;
    books = books - 19;
    console.log(books);
18. 18.⚡ What number does this code print?
    let coins = 14;
    coins = coins + 6;
    coins = coins - 3;
    console.log(coins);
19. 19.⚡ What number does this code print?
    let runs = 21;
    runs = runs + 10;
    runs = runs - 2;
    console.log(runs);
20. 20.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the address bar (d) in the console
21. 21.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) name (b) Arjun (c) Hello, name! (d) Hello, Arjun!
22. 22.⚡ What number does this code print?
    let a = 3;
    let b = 10;
    console.log(a * b);
23. 23.⚡ What number does this code print?
    let a = 44;
    let b = 2;
    console.log(a + b);
24. 24.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .jpg (c) .html (d) .css
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 3;
    console.log(x + y); (a) 73 (b) 10 (c) Error
26. 26.⚡ What number does this code print?
    let marks = 24;
    marks = marks + 5;
    marks = marks - 8;
    console.log(marks);
27. 27.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Kabir (c) name (d) Hi, Kabir!
28. 28.⚡ What number does this code print?
    let a = 11;
    let b = 8;
    console.log(a * b);
29. 29.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Aman (d) Hello, Aman!
30. 30.⚡ What number does this code print?
    let a = 7;
    let b = 4;
    console.log(a * b);
31. 31.⚡ What number does this code print?
    let apples = 30;
    apples = apples + 2;
    apples = apples - 13;
    console.log(apples);
32. 32.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <style> (d) <script>
33. 33.⚡ What number does this code print?
    let a = 28;
    let b = 2;
    console.log(a - b);
34. 34.⚡ What number does this code print?
    let books = 16;
    books = books + 17;
    books = books - 21;
    console.log(books);
35. 35.⚡ What number does this code print?
    let a = 37;
    let b = 14;
    console.log(a + b);
36. 36.⚡ What number does this code print?
    let a = 34;
    let b = 28;
    console.log(a + b);
37. 37.⚡ What number does this code print?
    let coins = 9;
    coins = coins + 18;
    coins = coins - 10;
    console.log(coins);
38. 38.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) the domain name (d) only colours
39. 39.⚡ What number does this code print?
    let a = 34;
    let b = 24;
    console.log(a - b);
40. 40.⚡ What number does this code print?
    let books = 9;
    books = books + 3;
    books = books - 8;
    console.log(books);

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