JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 412 · 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) console.log() (b) if (c) alert() (d) let
2. 2.⚡ What does this code show?
   let name = "Arjun";
   console.log("Hello, " + name + "!"); (a) Arjun (b) Hello, Arjun! (c) name (d) Hello, name!
3. 3.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) let (c) for (d) if
4. 4.⚡ What number does this code print?
   let a = 38;
   let b = 8;
   console.log(a + b);
5. 5.⚡ What number does this code print?
   let a = 2;
   let b = 6;
   console.log(a * b);
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 3;
   console.log(x + y); (a) Error (b) 23 (c) 5
7. 7.⚡ What number does this code print?
   let a = 33;
   let b = 33;
   console.log(a + b);
8. 8.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) alert() (c) if (d) let
9. 9.⚡ What does alert() show? (a) a picture (b) a pop-up box (c) a table (d) a new tab
10. 10.⚡ What number does this code print?
    let score = 19;
    score = score + 16;
    score = score - 30;
    console.log(score);
11. 11.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Riya (b) name (c) Hello, Riya! (d) Hello, name!
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 7;
    console.log(x + y); (a) Error (b) 12 (c) 57
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 7;
    console.log(x + y); (a) 9 (b) 27 (c) Error
14. 14.⚡ What number does this code print?
    let books = 28;
    books = books + 8;
    books = books - 13;
    console.log(books);
15. 15.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Hello, Zoya! (b) Zoya (c) name (d) Hello, name!
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 4;
    console.log(x + y); (a) 11 (b) Error (c) 74
17. 17.⚡ Which JavaScript word repeats code? (a) let (b) console.log() (c) if (d) for
18. 18.⚡ What number does this code print?
    let a = 36;
    let b = 26;
    console.log(a - b);
19. 19.⚡ What number does this code print?
    let a = 38;
    let b = 19;
    console.log(a - b);
20. 20.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Kabir (b) Hello, Kabir! (c) name (d) Hello, name!
21. 21.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <script> (d) <js>
22. 22.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) name (b) Well done, Zoya! (c) Zoya (d) Well done, name!
23. 23.⚡ Which word makes a new variable? (a) make (b) let (c) give (d) put
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y); (a) 44 (b) Error (c) 8
25. 25.⚡ What number does this code print?
    let a = 34;
    let b = 24;
    console.log(a + b);
26. 26.⚡ What number does this code print?
    let score = 21;
    score = score + 14;
    score = score - 14;
    console.log(score);
27. 27.⚡ What number does this code print?
    let books = 10;
    books = books + 14;
    books = books - 23;
    console.log(books);
28. 28.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .js (c) .html (d) .jpg
29. 29.⚡ What number does this code print?
    let a = 59;
    let b = 9;
    console.log(a - b);
30. 30.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Well done, Aman! (d) Aman
31. 31.⚡ What number does this code print?
    let a = 32;
    let b = 16;
    console.log(a - b);
32. 32.⚡ What number does this code print?
    let books = 29;
    books = books + 17;
    books = books - 46;
    console.log(books);
33. 33.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) on the title bar (d) in the console
34. 34.⚡ What number does this code print?
    let a = 2;
    let b = 2;
    console.log(a * b);
35. 35.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Meera (d) Hello, Meera!
36. 36.⚡ What number does this code print?
    let coins = 27;
    coins = coins + 5;
    coins = coins - 32;
    console.log(coins);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) 33 (b) 6 (c) Error
38. 38.⚡ What number does this code print?
    let a = 58;
    let b = 40;
    console.log(a - b);
39. 39.⚡ What number does this code print?
    let a = 42;
    let b = 31;
    console.log(a - b);
40. 40.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Aman! (c) name (d) Aman

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