JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 123 · 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 repeats code? (a) if (b) alert() (c) for (d) console.log()
2. 2.⚡ What number does this code print?
   let a = 16;
   let b = 7;
   console.log(a - b);
3. 3.⚡ What does this code show?
   let name = "Zoya";
   console.log("Hello, " + name + "!"); (a) Zoya (b) Hello, Zoya! (c) name (d) Hello, name!
4. 4.⚡ Which JavaScript word shows a pop-up box? (a) let (b) for (c) console.log() (d) alert()
5. 5.⚡ Which JavaScript word writes in the console? (a) for (b) let (c) alert() (d) console.log()
6. 6.⚡ What number does this code print?
   let apples = 6;
   apples = apples + 18;
   apples = apples - 12;
   console.log(apples);
7. 7.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .jpg (c) .css (d) .js
8. 8.⚡ What number does this code print?
   let score = 17;
   score = score + 11;
   score = score - 6;
   console.log(score);
9. 9.⚡ What number does this code print?
   let coins = 15;
   coins = coins + 19;
   coins = coins - 12;
   console.log(coins);
10. 10.⚡ What number does this code print?
    let coins = 17;
    coins = coins + 9;
    coins = coins - 4;
    console.log(coins);
11. 11.⚡ What number does this code print?
    let books = 16;
    books = books + 14;
    books = books - 17;
    console.log(books);
12. 12.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Meera! (c) name (d) Meera
13. 13.⚡ What number does this code print?
    let runs = 5;
    runs = runs + 4;
    runs = runs - 9;
    console.log(runs);
14. 14.⚡ What number does this code print?
    let a = 37;
    let b = 8;
    console.log(a - b);
15. 15.⚡ What number does this code print?
    let marks = 5;
    marks = marks + 11;
    marks = marks - 13;
    console.log(marks);
16. 16.⚡ What number does this code print?
    let books = 9;
    books = books + 12;
    books = books - 13;
    console.log(books);
17. 17.⚡ What number does this code print?
    let a = 60;
    let b = 40;
    console.log(a - b);
18. 18.⚡ What does alert() show? (a) a new tab (b) a table (c) a picture (d) a pop-up box
19. 19.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) only colours (d) the page title
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) Error (b) 3 (c) 21
21. 21.⚡ What number does this code print?
    let a = 11;
    let b = 11;
    console.log(a * b);
22. 22.⚡ What number does this code print?
    let a = 23;
    let b = 6;
    console.log(a + b);
23. 23.⚡ What number does this code print?
    let a = 2;
    let b = 6;
    console.log(a * b);
24. 24.⚡ What number does this code print?
    let score = 26;
    score = score + 7;
    score = score - 31;
    console.log(score);
25. 25.⚡ What number does this code print?
    let a = 9;
    let b = 2;
    console.log(a * b);
26. 26.⚡ What number does this code print?
    let a = 9;
    let b = 3;
    console.log(a * b);
27. 27.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Hi, Riya! (b) Riya (c) name (d) Hi, name!
28. 28.⚡ What number does this code print?
    let a = 32;
    let b = 40;
    console.log(a + b);
29. 29.⚡ What number does this code print?
    let a = 11;
    let b = 4;
    console.log(a * b);
30. 30.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) name (b) Arjun (c) Welcome, Arjun! (d) Welcome, name!
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 8;
    console.log(x + y); (a) 10 (b) Error (c) 28
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y); (a) Error (b) 9 (c) 18
33. 33.⚡ What number does this code print?
    let coins = 14;
    coins = coins + 8;
    coins = coins - 2;
    console.log(coins);
34. 34.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <style> (c) <script> (d) <js>
35. 35.⚡ What number does this code print?
    let a = 57;
    let b = 37;
    console.log(a + b);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 5;
    console.log(x + y); (a) Error (b) 25 (c) 7
37. 37.⚡ What number does this code print?
    let a = 15;
    let b = 5;
    console.log(a - b);
38. 38.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Meera (b) Hi, name! (c) name (d) Hi, Meera!
39. 39.⚡ Which JavaScript word runs code when true? (a) alert() (b) console.log() (c) for (d) if
40. 40.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) Meera (b) name (c) Well done, name! (d) Well done, Meera!

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