JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 37 · 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 number does this code print?
   let books = 7;
   books = books + 18;
   books = books - 8;
   console.log(books);
2. 2.⚡ What number does this code print?
   let a = 2;
   let b = 3;
   console.log(a * b);
3. 3.⚡ Which JavaScript word writes in the console? (a) alert() (b) for (c) let (d) console.log()
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 2;
   console.log(x + y); (a) Error (b) 3 (c) 12
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 2;
   console.log(x + y); (a) 52 (b) 7 (c) Error
6. 6.⚡ What does alert() show? (a) a new tab (b) a pop-up box (c) a table (d) a picture
7. 7.⚡ Which JavaScript word makes a new variable? (a) alert() (b) if (c) for (d) let
8. 8.⚡ What number does this code print?
   let coins = 10;
   coins = coins + 15;
   coins = coins - 14;
   console.log(coins);
9. 9.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) for (c) let (d) alert()
10. 10.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) name (b) Meera (c) Well done, Meera! (d) Well done, name!
11. 11.⚡ Which JavaScript word repeats code? (a) alert() (b) for (c) if (d) console.log()
12. 12.⚡ Which JavaScript word runs code when true? (a) alert() (b) for (c) console.log() (d) if
13. 13.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Riya (d) Well done, Riya!
14. 14.⚡ What number does this code print?
    let marks = 21;
    marks = marks + 16;
    marks = marks - 14;
    console.log(marks);
15. 15.⚡ Which word makes a new variable? (a) make (b) let (c) give (d) put
16. 16.⚡ What number does this code print?
    let a = 19;
    let b = 7;
    console.log(a + b);
17. 17.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Riya (c) name (d) Hello, Riya!
18. 18.⚡ What number does this code print?
    let books = 16;
    books = books + 13;
    books = books - 15;
    console.log(books);
19. 19.⚡ What number does this code print?
    let books = 28;
    books = books + 4;
    books = books - 19;
    console.log(books);
20. 20.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Hi, Meera! (b) name (c) Meera (d) Hi, name!
21. 21.⚡ What number does this code print?
    let a = 24;
    let b = 12;
    console.log(a - b);
22. 22.⚡ Where does console.log() show its output? (a) in the console (b) in the address bar (c) on the printer (d) on the title bar
23. 23.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) only colours (d) actions and changes
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 1;
    console.log(x + y); (a) 8 (b) Error (c) 71
25. 25.⚡ What number does this code print?
    let coins = 7;
    coins = coins + 16;
    coins = coins - 9;
    console.log(coins);
26. 26.⚡ What number does this code print?
    let a = 59;
    let b = 37;
    console.log(a - b);
27. 27.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .js (c) .css (d) .html
28. 28.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <script> (d) <code>
29. 29.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) name (b) Zoya (c) Welcome, Zoya! (d) Welcome, name!
30. 30.⚡ What number does this code print?
    let runs = 13;
    runs = runs + 7;
    runs = runs - 6;
    console.log(runs);
31. 31.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) name (b) Kabir (c) Hi, Kabir! (d) Hi, name!
32. 32.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Riya (b) Hi, Riya! (c) name (d) Hi, name!
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y); (a) 18 (b) Error (c) 9
34. 34.⚡ What number does this code print?
    let a = 5;
    let b = 5;
    console.log(a * b);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y); (a) Error (b) 22 (c) 4
36. 36.⚡ What number does this code print?
    let apples = 16;
    apples = apples + 18;
    apples = apples - 2;
    console.log(apples);
37. 37.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Welcome, Zoya! (b) Welcome, name! (c) Zoya (d) name
38. 38.⚡ What number does this code print?
    let a = 11;
    let b = 4;
    console.log(a * b);
39. 39.⚡ What number does this code print?
    let a = 27;
    let b = 26;
    console.log(a - b);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 6;
    console.log(x + y); (a) 13 (b) Error (c) 76

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