JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 923 · 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 title bar (c) on the printer (d) in the console
2. 2.⚡ What does this code show?
   let name = "Kabir";
   alert("Welcome, " + name + "!"); (a) Kabir (b) name (c) Welcome, Kabir! (d) Welcome, name!
3. 3.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <code> (c) <js> (d) <style>
4. 4.⚡ 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
5. 5.⚡ What number does this code print?
   let a = 7;
   let b = 5;
   console.log(a * b);
6. 6.⚡ 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
7. 7.⚡ What number does this code print?
   let a = 2;
   let b = 2;
   console.log(a * b);
8. 8.⚡ Which JavaScript word writes in the console? (a) let (b) for (c) console.log() (d) alert()
9. 9.⚡ What number does this code print?
   let a = 3;
   let b = 6;
   console.log(a * b);
10. 10.⚡ Which JavaScript word makes a new variable? (a) for (b) console.log() (c) if (d) let
11. 11.⚡ What number does this code print?
    let a = 5;
    let b = 8;
    console.log(a * b);
12. 12.⚡ What does alert() show? (a) a new tab (b) a picture (c) a table (d) a pop-up box
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) Error (b) 4 (c) 13
14. 14.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Aman (b) Well done, name! (c) name (d) Well done, Aman!
15. 15.⚡ What number does this code print?
    let a = 33;
    let b = 2;
    console.log(a - b);
16. 16.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) alert() (c) for (d) if
17. 17.⚡ What number does this code print?
    let a = 30;
    let b = 36;
    console.log(a + b);
18. 18.⚡ What number does this code print?
    let a = 10;
    let b = 10;
    console.log(a * b);
19. 19.⚡ What number does this code print?
    let a = 2;
    let b = 11;
    console.log(a * b);
20. 20.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Riya! (c) Riya (d) name
21. 21.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the page title (c) the domain name (d) only colours
22. 22.⚡ Which word makes a new variable? (a) put (b) give (c) let (d) make
23. 23.⚡ What number does this code print?
    let score = 17;
    score = score + 19;
    score = score - 29;
    console.log(score);
24. 24.⚡ Which JavaScript word runs code when true? (a) alert() (b) for (c) let (d) if
25. 25.⚡ What number does this code print?
    let a = 13;
    let b = 16;
    console.log(a + b);
26. 26.⚡ What number does this code print?
    let books = 15;
    books = books + 19;
    books = books - 20;
    console.log(books);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 3;
    console.log(x + y); (a) 12 (b) Error (c) 93
28. 28.⚡ What number does this code print?
    let a = 21;
    let b = 10;
    console.log(a + b);
29. 29.⚡ Which JavaScript word repeats code? (a) if (b) let (c) for (d) console.log()
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 7;
    console.log(x + y); (a) 16 (b) 97 (c) Error
31. 31.⚡ What number does this code print?
    let runs = 22;
    runs = runs + 14;
    runs = runs - 31;
    console.log(runs);
32. 32.⚡ What number does this code print?
    let coins = 13;
    coins = coins + 19;
    coins = coins - 26;
    console.log(coins);
33. 33.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) Well done, Meera! (b) Well done, name! (c) Meera (d) name
34. 34.⚡ What number does this code print?
    let a = 10;
    let b = 3;
    console.log(a * b);
35. 35.⚡ What number does this code print?
    let a = 12;
    let b = 12;
    console.log(a * b);
36. 36.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .jpg (c) .css (d) .js
37. 37.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Meera (d) Welcome, Meera!
38. 38.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Kabir (b) Well done, name! (c) Well done, Kabir! (d) name
39. 39.⚡ What number does this code print?
    let a = 42;
    let b = 4;
    console.log(a - b);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) 35 (b) Error (c) 8

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