JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 59 · 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 + 3;
   books = books - 8;
   console.log(books);
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 2;
   console.log(x + y); (a) Error (b) 92 (c) 11
3. 3.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) let (c) if (d) console.log()
4. 4.⚡ Which JavaScript word repeats code? (a) let (b) if (c) for (d) console.log()
5. 5.⚡ What number does this code print?
   let coins = 21;
   coins = coins + 12;
   coins = coins - 27;
   console.log(coins);
6. 6.⚡ Which JavaScript word runs code when true? (a) if (b) console.log() (c) for (d) let
7. 7.⚡ What number does this code print?
   let books = 13;
   books = books + 14;
   books = books - 22;
   console.log(books);
8. 8.⚡ What number does this code print?
   let a = 42;
   let b = 32;
   console.log(a + b);
9. 9.⚡ What number does this code print?
   let a = 19;
   let b = 4;
   console.log(a + b);
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 4;
    console.log(x + y); (a) Error (b) 24 (c) 6
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 6;
    console.log(x + y); (a) 8 (b) 26 (c) Error
12. 12.⚡ What number does this code print?
    let runs = 19;
    runs = runs + 3;
    runs = runs - 5;
    console.log(runs);
13. 13.⚡ What number does this code print?
    let score = 11;
    score = score + 16;
    score = score - 2;
    console.log(score);
14. 14.⚡ What number does this code print?
    let a = 28;
    let b = 33;
    console.log(a + b);
15. 15.⚡ Where does console.log() show its output? (a) on the printer (b) in the console (c) in the address bar (d) on the title bar
16. 16.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Aman (b) Hello, name! (c) name (d) Hello, Aman!
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 8;
    console.log(x + y); (a) Error (b) 98 (c) 17
18. 18.⚡ What does JavaScript add to a web page? (a) only colours (b) the page title (c) actions and changes (d) the domain name
19. 19.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, Riya! (c) Riya (d) Hi, name!
20. 20.⚡ Which JavaScript word writes in the console? (a) alert() (b) for (c) if (d) console.log()
21. 21.⚡ What number does this code print?
    let a = 30;
    let b = 10;
    console.log(a + b);
22. 22.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) name (b) Zoya (c) Welcome, name! (d) Welcome, Zoya!
23. 23.⚡ What number does this code print?
    let a = 30;
    let b = 3;
    console.log(a + b);
24. 24.⚡ What number does this code print?
    let a = 18;
    let b = 17;
    console.log(a - b);
25. 25.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Zoya! (c) Zoya (d) name
26. 26.⚡ What number does this code print?
    let runs = 25;
    runs = runs + 10;
    runs = runs - 35;
    console.log(runs);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) 21 (b) Error (c) 3
28. 28.⚡ Which word makes a new variable? (a) let (b) make (c) put (d) give
29. 29.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .js (c) .jpg (d) .html
30. 30.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <code> (d) <script>
31. 31.⚡ What number does this code print?
    let books = 11;
    books = books + 3;
    books = books - 2;
    console.log(books);
32. 32.⚡ What number does this code print?
    let runs = 8;
    runs = runs + 7;
    runs = runs - 1;
    console.log(runs);
33. 33.⚡ What number does this code print?
    let a = 42;
    let b = 16;
    console.log(a + b);
34. 34.⚡ What number does this code print?
    let a = 18;
    let b = 34;
    console.log(a + b);
35. 35.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) name (b) Hi, Kabir! (c) Hi, name! (d) Kabir
36. 36.⚡ What does alert() show? (a) a new tab (b) a picture (c) a table (d) a pop-up box
37. 37.⚡ What number does this code print?
    let a = 53;
    let b = 4;
    console.log(a - b);
38. 38.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Meera (b) Well done, name! (c) Well done, Meera! (d) name
39. 39.⚡ What number does this code print?
    let score = 8;
    score = score + 11;
    score = score - 17;
    console.log(score);
40. 40.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Aman (b) Welcome, name! (c) Welcome, Aman! (d) name

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