JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 961 · 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 = 12;
   let b = 5;
   console.log(a * b);
2. 2.⚡ Which JavaScript word makes a new variable? (a) let (b) for (c) alert() (d) console.log()
3. 3.⚡ What number does this code print?
   let score = 24;
   score = score + 19;
   score = score - 31;
   console.log(score);
4. 4.⚡ Which JavaScript word writes in the console? (a) console.log() (b) if (c) for (d) alert()
5. 5.⚡ What number does this code print?
   let runs = 5;
   runs = runs + 18;
   runs = runs - 17;
   console.log(runs);
6. 6.⚡ What number does this code print?
   let a = 48;
   let b = 40;
   console.log(a - b);
7. 7.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) only colours (d) the page title
8. 8.⚡ What does this code show?
   let name = "Meera";
   alert("Hi, " + name + "!"); (a) Meera (b) Hi, name! (c) Hi, Meera! (d) name
9. 9.⚡ What number does this code print?
   let score = 11;
   score = score + 7;
   score = score - 5;
   console.log(score);
10. 10.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .css (c) .jpg (d) .html
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y); (a) Error (b) 83 (c) 11
12. 12.⚡ What number does this code print?
    let a = 14;
    let b = 25;
    console.log(a + b);
13. 13.⚡ Which word makes a new variable? (a) give (b) let (c) put (d) make
14. 14.⚡ Which JavaScript word runs code when true? (a) alert() (b) console.log() (c) let (d) if
15. 15.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <code> (d) <script>
16. 16.⚡ Which JavaScript word repeats code? (a) alert() (b) let (c) for (d) if
17. 17.⚡ Where does console.log() show its output? (a) in the address bar (b) on the printer (c) on the title bar (d) in the console
18. 18.⚡ What number does this code print?
    let apples = 29;
    apples = apples + 12;
    apples = apples - 4;
    console.log(apples);
19. 19.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) let (c) alert() (d) for
20. 20.⚡ What number does this code print?
    let coins = 20;
    coins = coins + 12;
    coins = coins - 27;
    console.log(coins);
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 6;
    console.log(x + y); (a) 7 (b) 16 (c) Error
22. 22.⚡ What number does this code print?
    let books = 13;
    books = books + 20;
    books = books - 11;
    console.log(books);
23. 23.⚡ What number does this code print?
    let score = 30;
    score = score + 12;
    score = score - 7;
    console.log(score);
24. 24.⚡ What number does this code print?
    let score = 23;
    score = score + 19;
    score = score - 23;
    console.log(score);
25. 25.⚡ What number does this code print?
    let runs = 29;
    runs = runs + 20;
    runs = runs - 1;
    console.log(runs);
26. 26.⚡ What number does this code print?
    let a = 7;
    let b = 5;
    console.log(a * b);
27. 27.⚡ What number does this code print?
    let score = 27;
    score = score + 17;
    score = score - 3;
    console.log(score);
28. 28.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Arjun (c) name (d) Well done, Arjun!
29. 29.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Aman! (d) Aman
30. 30.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Zoya (b) Hello, Zoya! (c) name (d) Hello, name!
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) Error (b) 72 (c) 9
32. 32.⚡ What number does this code print?
    let apples = 24;
    apples = apples + 8;
    apples = apples - 12;
    console.log(apples);
33. 33.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Riya (d) Hi, Riya!
34. 34.⚡ What number does this code print?
    let apples = 12;
    apples = apples + 12;
    apples = apples - 5;
    console.log(apples);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 4;
    console.log(x + y); (a) 6 (b) Error (c) 24
36. 36.⚡ What number does this code print?
    let apples = 9;
    apples = apples + 11;
    apples = apples - 17;
    console.log(apples);
37. 37.⚡ What number does this code print?
    let a = 4;
    let b = 2;
    console.log(a * b);
38. 38.⚡ What number does this code print?
    let coins = 23;
    coins = coins + 15;
    coins = coins - 8;
    console.log(coins);
39. 39.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Arjun! (d) Arjun
40. 40.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, Riya! (b) Riya (c) Hi, name! (d) name

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