JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 301 · 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 does this code show?
   let name = "Riya";
   console.log("Well done, " + name + "!"); (a) Well done, Riya! (b) name (c) Well done, name! (d) Riya
2. 2.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <style> (d) <script>
3. 3.⚡ What number does this code print?
   let a = 26;
   let b = 21;
   console.log(a + b);
4. 4.⚡ Where does console.log() show its output? (a) on the title bar (b) in the console (c) in the address bar (d) on the printer
5. 5.⚡ Which JavaScript word writes in the console? (a) for (b) let (c) alert() (d) console.log()
6. 6.⚡ What number does this code print?
   let runs = 10;
   runs = runs + 12;
   runs = runs - 3;
   console.log(runs);
7. 7.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the page title (c) the domain name (d) only colours
8. 8.⚡ What number does this code print?
   let a = 9;
   let b = 9;
   console.log(a * b);
9. 9.⚡ What does alert() show? (a) a new tab (b) a picture (c) a pop-up box (d) a table
10. 10.⚡ Which JavaScript word shows a pop-up box? (a) if (b) let (c) console.log() (d) alert()
11. 11.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .js (c) .css (d) .html
12. 12.⚡ What number does this code print?
    let a = 5;
    let b = 10;
    console.log(a * b);
13. 13.⚡ Which JavaScript word repeats code? (a) let (b) if (c) for (d) console.log()
14. 14.⚡ What number does this code print?
    let runs = 18;
    runs = runs + 10;
    runs = runs - 8;
    console.log(runs);
15. 15.⚡ What number does this code print?
    let apples = 12;
    apples = apples + 13;
    apples = apples - 9;
    console.log(apples);
16. 16.⚡ What number does this code print?
    let marks = 14;
    marks = marks + 10;
    marks = marks - 11;
    console.log(marks);
17. 17.⚡ What number does this code print?
    let coins = 7;
    coins = coins + 9;
    coins = coins - 2;
    console.log(coins);
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y); (a) 83 (b) Error (c) 11
19. 19.⚡ What number does this code print?
    let marks = 27;
    marks = marks + 12;
    marks = marks - 14;
    console.log(marks);
20. 20.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Riya (b) name (c) Hello, name! (d) Hello, Riya!
21. 21.⚡ What number does this code print?
    let books = 9;
    books = books + 12;
    books = books - 4;
    console.log(books);
22. 22.⚡ What number does this code print?
    let apples = 13;
    apples = apples + 16;
    apples = apples - 13;
    console.log(apples);
23. 23.⚡ What number does this code print?
    let a = 9;
    let b = 2;
    console.log(a * b);
24. 24.⚡ What number does this code print?
    let a = 36;
    let b = 25;
    console.log(a - b);
25. 25.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, Meera! (c) Hi, name! (d) Meera
26. 26.⚡ What number does this code print?
    let a = 59;
    let b = 11;
    console.log(a + b);
27. 27.⚡ What number does this code print?
    let marks = 24;
    marks = marks + 12;
    marks = marks - 2;
    console.log(marks);
28. 28.⚡ What number does this code print?
    let a = 11;
    let b = 7;
    console.log(a * b);
29. 29.⚡ Which word makes a new variable? (a) make (b) put (c) let (d) give
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 9;
    console.log(x + y); (a) Error (b) 16 (c) 79
31. 31.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Kabir! (d) Kabir
32. 32.⚡ What number does this code print?
    let a = 50;
    let b = 13;
    console.log(a + b);
33. 33.⚡ What number does this code print?
    let books = 8;
    books = books + 5;
    books = books - 10;
    console.log(books);
34. 34.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) Meera (b) name (c) Well done, name! (d) Well done, Meera!
35. 35.⚡ What number does this code print?
    let books = 20;
    books = books + 8;
    books = books - 8;
    console.log(books);
36. 36.⚡ What number does this code print?
    let a = 35;
    let b = 10;
    console.log(a - b);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 8;
    console.log(x + y); (a) 38 (b) Error (c) 11
38. 38.⚡ What number does this code print?
    let coins = 25;
    coins = coins + 10;
    coins = coins - 6;
    console.log(coins);
39. 39.⚡ What number does this code print?
    let marks = 28;
    marks = marks + 9;
    marks = marks - 10;
    console.log(marks);
40. 40.⚡ What number does this code print?
    let a = 12;
    let b = 12;
    console.log(a * b);

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