JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 885 · 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 runs code when true? (a) if (b) alert() (c) console.log() (d) for
2. 2.⚡ What number does this code print?
   let a = 51;
   let b = 10;
   console.log(a - b);
3. 3.⚡ Which JavaScript word shows a pop-up box? (a) for (b) if (c) alert() (d) let
4. 4.⚡ Which JavaScript word writes in the console? (a) let (b) console.log() (c) alert() (d) for
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 2;
   console.log(x + y); (a) Error (b) 9 (c) 72
6. 6.⚡ What number does this code print?
   let a = 27;
   let b = 11;
   console.log(a - b);
7. 7.⚡ What does this code show?
   let name = "Zoya";
   console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Zoya! (c) Zoya (d) Welcome, name!
8. 8.⚡ What does this code show?
   let name = "Aman";
   alert("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Aman (d) Hello, Aman!
9. 9.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) alert() (c) if (d) let
10. 10.⚡ What does alert() show? (a) a picture (b) a table (c) a new tab (d) a pop-up box
11. 11.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Zoya (b) name (c) Hi, name! (d) Hi, Zoya!
12. 12.⚡ What number does this code print?
    let a = 11;
    let b = 13;
    console.log(a + b);
13. 13.⚡ Which word makes a new variable? (a) put (b) give (c) make (d) let
14. 14.⚡ Which JavaScript word repeats code? (a) alert() (b) let (c) for (d) if
15. 15.⚡ What number does this code print?
    let score = 27;
    score = score + 14;
    score = score - 14;
    console.log(score);
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y); (a) 44 (b) Error (c) 8
17. 17.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <script> (c) <style> (d) <code>
18. 18.⚡ What number does this code print?
    let coins = 18;
    coins = coins + 20;
    coins = coins - 22;
    console.log(coins);
19. 19.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .js (d) .html
20. 20.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) the page title (d) actions and changes
21. 21.⚡ What number does this code print?
    let score = 10;
    score = score + 2;
    score = score - 7;
    console.log(score);
22. 22.⚡ What number does this code print?
    let books = 22;
    books = books + 6;
    books = books - 19;
    console.log(books);
23. 23.⚡ What number does this code print?
    let books = 7;
    books = books + 15;
    books = books - 7;
    console.log(books);
24. 24.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Kabir (b) Well done, name! (c) name (d) Well done, Kabir!
25. 25.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Welcome, Riya! (b) Welcome, name! (c) name (d) Riya
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 2;
    console.log(x + y); (a) 82 (b) Error (c) 10
27. 27.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Meera (b) name (c) Welcome, name! (d) Welcome, Meera!
28. 28.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 4;
    apples = apples - 1;
    console.log(apples);
29. 29.⚡ What number does this code print?
    let a = 47;
    let b = 40;
    console.log(a + b);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 3;
    console.log(x + y); (a) Error (b) 53 (c) 8
31. 31.⚡ What number does this code print?
    let books = 30;
    books = books + 16;
    books = books - 12;
    console.log(books);
32. 32.⚡ Where does console.log() show its output? (a) on the title bar (b) in the address bar (c) in the console (d) on the printer
33. 33.⚡ What number does this code print?
    let books = 26;
    books = books + 6;
    books = books - 20;
    console.log(books);
34. 34.⚡ What number does this code print?
    let runs = 6;
    runs = runs + 20;
    runs = runs - 3;
    console.log(runs);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 8;
    console.log(x + y); (a) 68 (b) 14 (c) Error
36. 36.⚡ What number does this code print?
    let a = 31;
    let b = 38;
    console.log(a + b);
37. 37.⚡ What number does this code print?
    let score = 26;
    score = score + 6;
    score = score - 20;
    console.log(score);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 5;
    console.log(x + y); (a) 6 (b) Error (c) 15
39. 39.⚡ What number does this code print?
    let a = 44;
    let b = 27;
    console.log(a - b);
40. 40.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Arjun (b) Well done, name! (c) Well done, Arjun! (d) name

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