JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 637 · 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) let (b) if (c) alert() (d) console.log()
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 1;
   console.log(x + y); (a) Error (b) 11 (c) 2
3. 3.⚡ What number does this code print?
   let apples = 20;
   apples = apples + 12;
   apples = apples - 7;
   console.log(apples);
4. 4.⚡ What does this code show?
   let name = "Kabir";
   alert("Well done, " + name + "!"); (a) Well done, Kabir! (b) name (c) Well done, name! (d) Kabir
5. 5.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the page title (c) only colours (d) the domain name
6. 6.⚡ What number does this code print?
   let runs = 14;
   runs = runs + 14;
   runs = runs - 7;
   console.log(runs);
7. 7.⚡ What does this code show?
   let name = "Kabir";
   console.log("Well done, " + name + "!"); (a) Well done, name! (b) Kabir (c) Well done, Kabir! (d) name
8. 8.⚡ What number does this code print?
   let score = 10;
   score = score + 12;
   score = score - 9;
   console.log(score);
9. 9.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <style> (d) <script>
10. 10.⚡ What number does this code print?
    let a = 43;
    let b = 28;
    console.log(a + b);
11. 11.⚡ What number does this code print?
    let apples = 25;
    apples = apples + 6;
    apples = apples - 10;
    console.log(apples);
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 7;
    console.log(x + y); (a) Error (b) 27 (c) 9
13. 13.⚡ What number does this code print?
    let a = 9;
    let b = 3;
    console.log(a * b);
14. 14.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .jpg (d) .js
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 4;
    console.log(x + y); (a) Error (b) 10 (c) 64
16. 16.⚡ What number does this code print?
    let score = 16;
    score = score + 3;
    score = score - 9;
    console.log(score);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 1;
    console.log(x + y); (a) 7 (b) Error (c) 61
18. 18.⚡ Which JavaScript word writes in the console? (a) let (b) for (c) console.log() (d) alert()
19. 19.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Zoya (b) Welcome, name! (c) name (d) Welcome, Zoya!
20. 20.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Hello, Zoya! (b) Zoya (c) name (d) Hello, name!
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 6;
    console.log(x + y); (a) 13 (b) Error (c) 76
22. 22.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) let (c) for (d) if
23. 23.⚡ Which JavaScript word shows a pop-up box? (a) for (b) alert() (c) let (d) if
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) 56 (b) 11 (c) Error
25. 25.⚡ Where does console.log() show its output? (a) on the title bar (b) in the console (c) in the address bar (d) on the printer
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 7;
    console.log(x + y); (a) 47 (b) Error (c) 11
27. 27.⚡ What number does this code print?
    let a = 12;
    let b = 8;
    console.log(a * b);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 6;
    console.log(x + y); (a) Error (b) 12 (c) 66
29. 29.⚡ What number does this code print?
    let score = 25;
    score = score + 12;
    score = score - 31;
    console.log(score);
30. 30.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Well done, Meera! (d) Meera
31. 31.⚡ What number does this code print?
    let a = 51;
    let b = 40;
    console.log(a + b);
32. 32.⚡ Which JavaScript word repeats code? (a) for (b) alert() (c) console.log() (d) if
33. 33.⚡ 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
34. 34.⚡ What number does this code print?
    let a = 10;
    let b = 1;
    console.log(a + b);
35. 35.⚡ Which word makes a new variable? (a) put (b) let (c) make (d) give
36. 36.⚡ What number does this code print?
    let books = 19;
    books = books + 12;
    books = books - 5;
    console.log(books);
37. 37.⚡ What number does this code print?
    let runs = 16;
    runs = runs + 17;
    runs = runs - 6;
    console.log(runs);
38. 38.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, Riya! (b) name (c) Riya (d) Welcome, name!
39. 39.⚡ What number does this code print?
    let apples = 27;
    apples = apples + 8;
    apples = apples - 10;
    console.log(apples);
40. 40.⚡ What number does this code print?
    let score = 27;
    score = score + 16;
    score = score - 17;
    console.log(score);

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