JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 227 · 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.⚡ What number does this code print?
   let a = 7;
   let b = 3;
   console.log(a * b);
2. 2.⚡ What number does this code print?
   let a = 9;
   let b = 7;
   console.log(a * b);
3. 3.⚡ What number does this code print?
   let a = 12;
   let b = 9;
   console.log(a * b);
4. 4.⚡ What number does this code print?
   let coins = 25;
   coins = coins + 3;
   coins = coins - 10;
   console.log(coins);
5. 5.⚡ Which JavaScript word repeats code? (a) let (b) console.log() (c) for (d) if
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 6;
   console.log(x + y); (a) 12 (b) Error (c) 66
7. 7.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .css (c) .html (d) .js
8. 8.⚡ What number does this code print?
   let a = 41;
   let b = 39;
   console.log(a + b);
9. 9.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the page title (c) the domain name (d) only colours
10. 10.⚡ What number does this code print?
    let runs = 11;
    runs = runs + 12;
    runs = runs - 6;
    console.log(runs);
11. 11.⚡ Which word makes a new variable? (a) put (b) give (c) make (d) let
12. 12.⚡ Which JavaScript word makes a new variable? (a) let (b) if (c) for (d) console.log()
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) 4 (b) 13 (c) Error
14. 14.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Riya (b) Hello, Riya! (c) Hello, name! (d) name
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 4;
    console.log(x + y); (a) 54 (b) Error (c) 9
16. 16.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <style> (c) <code> (d) <js>
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 8;
    console.log(x + y); (a) 15 (b) 78 (c) Error
18. 18.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Kabir (d) Welcome, Kabir!
19. 19.⚡ Which JavaScript word shows a pop-up box? (a) let (b) for (c) console.log() (d) alert()
20. 20.⚡ Which JavaScript word runs code when true? (a) alert() (b) for (c) if (d) console.log()
21. 21.⚡ What number does this code print?
    let a = 4;
    let b = 6;
    console.log(a * b);
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) Error (b) 5 (c) 41
23. 23.⚡ What number does this code print?
    let marks = 16;
    marks = marks + 20;
    marks = marks - 36;
    console.log(marks);
24. 24.⚡ Which JavaScript word writes in the console? (a) if (b) console.log() (c) alert() (d) let
25. 25.⚡ What number does this code print?
    let a = 14;
    let b = 39;
    console.log(a + b);
26. 26.⚡ What number does this code print?
    let score = 17;
    score = score + 5;
    score = score - 9;
    console.log(score);
27. 27.⚡ What number does this code print?
    let a = 32;
    let b = 7;
    console.log(a - b);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y); (a) Error (b) 22 (c) 4
29. 29.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, Meera! (c) Meera (d) Welcome, name!
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 8;
    console.log(x + y); (a) Error (b) 48 (c) 12
31. 31.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Meera (b) Hello, Meera! (c) Hello, name! (d) name
32. 32.⚡ What number does this code print?
    let a = 17;
    let b = 8;
    console.log(a - b);
33. 33.⚡ What number does this code print?
    let a = 54;
    let b = 10;
    console.log(a + b);
34. 34.⚡ What number does this code print?
    let apples = 15;
    apples = apples + 18;
    apples = apples - 22;
    console.log(apples);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 3;
    console.log(x + y); (a) 12 (b) Error (c) 93
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y); (a) 11 (b) Error (c) 83
37. 37.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) name (b) Meera (c) Well done, name! (d) Well done, Meera!
38. 38.⚡ What number does this code print?
    let a = 42;
    let b = 30;
    console.log(a - b);
39. 39.⚡ What number does this code print?
    let books = 10;
    books = books + 14;
    books = books - 23;
    console.log(books);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 2;
    console.log(x + y); (a) 82 (b) 10 (c) Error

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