JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 764 · 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) console.log() (b) if (c) alert() (d) for
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 2;
   console.log(x + y); (a) Error (b) 7 (c) 52
3. 3.⚡ Which JavaScript word writes in the console? (a) alert() (b) let (c) console.log() (d) if
4. 4.⚡ What does alert() show? (a) a table (b) a picture (c) a pop-up box (d) a new tab
5. 5.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .css (d) .js
6. 6.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) for (c) alert() (d) let
7. 7.⚡ What number does this code print?
   let a = 9;
   let b = 10;
   console.log(a * b);
8. 8.⚡ What number does this code print?
   let apples = 19;
   apples = apples + 9;
   apples = apples - 16;
   console.log(apples);
9. 9.⚡ What does this code show?
   let name = "Arjun";
   console.log("Welcome, " + name + "!"); (a) Welcome, Arjun! (b) Arjun (c) Welcome, name! (d) name
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y); (a) 22 (b) Error (c) 4
11. 11.⚡ What number does this code print?
    let a = 16;
    let b = 5;
    console.log(a + b);
12. 12.⚡ Which word makes a new variable? (a) give (b) make (c) put (d) let
13. 13.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Kabir (b) name (c) Hello, Kabir! (d) Hello, name!
14. 14.⚡ Which JavaScript word shows a pop-up box? (a) for (b) if (c) console.log() (d) alert()
15. 15.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Meera (b) Hi, Meera! (c) Hi, name! (d) name
16. 16.⚡ What number does this code print?
    let books = 8;
    books = books + 8;
    books = books - 6;
    console.log(books);
17. 17.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Zoya (b) Welcome, Zoya! (c) Welcome, name! (d) name
18. 18.⚡ What number does this code print?
    let coins = 29;
    coins = coins + 3;
    coins = coins - 24;
    console.log(coins);
19. 19.⚡ Which JavaScript word runs code when true? (a) alert() (b) console.log() (c) if (d) for
20. 20.⚡ What number does this code print?
    let a = 2;
    let b = 12;
    console.log(a * b);
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 4;
    console.log(x + y); (a) 13 (b) Error (c) 94
22. 22.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <code> (c) <style> (d) <js>
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 9;
    console.log(x + y); (a) 10 (b) Error (c) 19
24. 24.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) actions and changes (d) only colours
25. 25.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Riya (b) Hello, Riya! (c) Hello, name! (d) name
26. 26.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Riya (b) name (c) Well done, Riya! (d) Well done, name!
27. 27.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Arjun! (d) Arjun
28. 28.⚡ What number does this code print?
    let a = 9;
    let b = 7;
    console.log(a * b);
29. 29.⚡ What number does this code print?
    let a = 23;
    let b = 22;
    console.log(a - b);
30. 30.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the console (d) in the address bar
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 5;
    console.log(x + y); (a) 65 (b) Error (c) 11
32. 32.⚡ What number does this code print?
    let a = 21;
    let b = 10;
    console.log(a - b);
33. 33.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Meera (b) Welcome, name! (c) Welcome, Meera! (d) name
34. 34.⚡ What number does this code print?
    let apples = 30;
    apples = apples + 8;
    apples = apples - 14;
    console.log(apples);
35. 35.⚡ What number does this code print?
    let a = 46;
    let b = 6;
    console.log(a - b);
36. 36.⚡ What number does this code print?
    let a = 25;
    let b = 18;
    console.log(a - b);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 5;
    console.log(x + y); (a) 7 (b) 25 (c) Error
38. 38.⚡ What number does this code print?
    let a = 2;
    let b = 7;
    console.log(a * b);
39. 39.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Meera (b) Hi, name! (c) name (d) Hi, Meera!
40. 40.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Zoya! (c) name (d) Zoya

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