JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 955 · 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) alert() (b) let (c) console.log() (d) if
2. 2.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) actions and changes (d) the page title
3. 3.⚡ What does this code show?
   let name = "Riya";
   console.log("Hi, " + name + "!"); (a) Riya (b) Hi, name! (c) name (d) Hi, Riya!
4. 4.⚡ What number does this code print?
   let coins = 16;
   coins = coins + 19;
   coins = coins - 22;
   console.log(coins);
5. 5.⚡ What does this code show?
   let name = "Arjun";
   console.log("Well done, " + name + "!"); (a) name (b) Arjun (c) Well done, Arjun! (d) Well done, name!
6. 6.⚡ Which JavaScript word makes a new variable? (a) if (b) console.log() (c) alert() (d) let
7. 7.⚡ Which JavaScript word writes in the console? (a) for (b) console.log() (c) alert() (d) let
8. 8.⚡ What number does this code print?
   let apples = 28;
   apples = apples + 7;
   apples = apples - 12;
   console.log(apples);
9. 9.⚡ Where does console.log() show its output? (a) in the console (b) on the printer (c) in the address bar (d) on the title bar
10. 10.⚡ What number does this code print?
    let a = 17;
    let b = 29;
    console.log(a + b);
11. 11.⚡ What does alert() show? (a) a pop-up box (b) a picture (c) a new tab (d) a table
12. 12.⚡ What number does this code print?
    let score = 5;
    score = score + 15;
    score = score - 20;
    console.log(score);
13. 13.⚡ What number does this code print?
    let runs = 13;
    runs = runs + 6;
    runs = runs - 18;
    console.log(runs);
14. 14.⚡ What number does this code print?
    let books = 26;
    books = books + 13;
    books = books - 38;
    console.log(books);
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y); (a) Error (b) 11 (c) 83
16. 16.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <style> (d) <code>
17. 17.⚡ What number does this code print?
    let a = 25;
    let b = 3;
    console.log(a + b);
18. 18.⚡ What number does this code print?
    let a = 54;
    let b = 6;
    console.log(a + b);
19. 19.⚡ Which word makes a new variable? (a) make (b) give (c) let (d) put
20. 20.⚡ Which JavaScript word repeats code? (a) let (b) for (c) console.log() (d) if
21. 21.⚡ Which JavaScript word shows a pop-up box? (a) let (b) console.log() (c) alert() (d) if
22. 22.⚡ What number does this code print?
    let a = 9;
    let b = 8;
    console.log(a * b);
23. 23.⚡ 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
24. 24.⚡ What number does this code print?
    let a = 3;
    let b = 4;
    console.log(a * b);
25. 25.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Arjun (b) Well done, Arjun! (c) name (d) Well done, name!
26. 26.⚡ What number does this code print?
    let a = 24;
    let b = 7;
    console.log(a - b);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y); (a) 91 (b) Error (c) 10
28. 28.⚡ What number does this code print?
    let runs = 12;
    runs = runs + 4;
    runs = runs - 12;
    console.log(runs);
29. 29.⚡ What number does this code print?
    let a = 8;
    let b = 25;
    console.log(a + b);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y); (a) 51 (b) 6 (c) Error
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 5;
    console.log(x + y); (a) Error (b) 15 (c) 6
32. 32.⚡ What number does this code print?
    let a = 30;
    let b = 26;
    console.log(a + b);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) Error (b) 5 (c) 23
34. 34.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) name (b) Riya (c) Hello, Riya! (d) Hello, name!
35. 35.⚡ What number does this code print?
    let books = 10;
    books = books + 5;
    books = books - 10;
    console.log(books);
36. 36.⚡ What number does this code print?
    let marks = 28;
    marks = marks + 18;
    marks = marks - 36;
    console.log(marks);
37. 37.⚡ What number does this code print?
    let apples = 17;
    apples = apples + 2;
    apples = apples - 12;
    console.log(apples);
38. 38.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Aman (d) Hi, Aman!
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 4;
    console.log(x + y); (a) Error (b) 84 (c) 12
40. 40.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Zoya! (d) Zoya

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