JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 690 · 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.⚡ 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
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 5;
   console.log(x + y); (a) 14 (b) 95 (c) Error
3. 3.⚡ 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
4. 4.⚡ Which JavaScript word writes in the console? (a) if (b) alert() (c) console.log() (d) let
5. 5.⚡ Which JavaScript word shows a pop-up box? (a) for (b) let (c) alert() (d) if
6. 6.⚡ What number does this code print?
   let a = 59;
   let b = 35;
   console.log(a + b);
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 5;
   console.log(x + y); (a) 75 (b) Error (c) 12
8. 8.⚡ What does this code show?
   let name = "Meera";
   alert("Hi, " + name + "!"); (a) Hi, Meera! (b) Hi, name! (c) Meera (d) name
9. 9.⚡ What does this code show?
   let name = "Kabir";
   alert("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Kabir! (d) Kabir
10. 10.⚡ What number does this code print?
    let coins = 22;
    coins = coins + 19;
    coins = coins - 10;
    console.log(coins);
11. 11.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Riya (c) Hi, Riya! (d) name
12. 12.⚡ What number does this code print?
    let books = 30;
    books = books + 8;
    books = books - 11;
    console.log(books);
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y); (a) 83 (b) 11 (c) Error
14. 14.⚡ Which JavaScript word makes a new variable? (a) if (b) let (c) console.log() (d) for
15. 15.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Riya (b) Welcome, name! (c) Welcome, Riya! (d) name
16. 16.⚡ What number does this code print?
    let a = 49;
    let b = 24;
    console.log(a - b);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 9;
    console.log(x + y); (a) 12 (b) 39 (c) Error
18. 18.⚡ Which word makes a new variable? (a) give (b) make (c) put (d) let
19. 19.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .css (d) .js
20. 20.⚡ What number does this code print?
    let apples = 24;
    apples = apples + 3;
    apples = apples - 3;
    console.log(apples);
21. 21.⚡ What number does this code print?
    let a = 35;
    let b = 22;
    console.log(a - b);
22. 22.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Zoya! (c) Zoya (d) name
23. 23.⚡ What number does this code print?
    let a = 53;
    let b = 7;
    console.log(a + b);
24. 24.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <code> (d) <script>
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 6;
    console.log(x + y); (a) 14 (b) Error (c) 86
26. 26.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) only colours (d) the domain name
27. 27.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Zoya (c) Welcome, Zoya! (d) name
28. 28.⚡ Which JavaScript word repeats code? (a) for (b) if (c) let (d) alert()
29. 29.⚡ What does alert() show? (a) a picture (b) a table (c) a new tab (d) a pop-up box
30. 30.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Meera (c) Hello, Meera! (d) name
31. 31.⚡ What number does this code print?
    let a = 10;
    let b = 11;
    console.log(a + b);
32. 32.⚡ What number does this code print?
    let a = 60;
    let b = 36;
    console.log(a - b);
33. 33.⚡ What number does this code print?
    let a = 4;
    let b = 5;
    console.log(a * b);
34. 34.⚡ What number does this code print?
    let score = 8;
    score = score + 4;
    score = score - 2;
    console.log(score);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y); (a) 67 (b) Error (c) 13
36. 36.⚡ Which JavaScript word runs code when true? (a) if (b) console.log() (c) let (d) alert()
37. 37.⚡ What number does this code print?
    let a = 12;
    let b = 2;
    console.log(a * b);
38. 38.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Riya! (c) name (d) Riya
39. 39.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Aman! (c) name (d) Aman
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y); (a) 31 (b) 4 (c) Error

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