JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 312 · 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 = "Aman";
   alert("Hi, " + name + "!"); (a) name (b) Hi, Aman! (c) Hi, name! (d) Aman
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 8;
   console.log(x + y); (a) 12 (b) Error (c) 48
3. 3.⚡ What number does this code print?
   let a = 7;
   let b = 15;
   console.log(a + b);
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 8;
   console.log(x + y); (a) Error (b) 38 (c) 11
5. 5.⚡ What does this code show?
   let name = "Kabir";
   alert("Hi, " + name + "!"); (a) name (b) Kabir (c) Hi, Kabir! (d) Hi, name!
6. 6.⚡ What number does this code print?
   let a = 46;
   let b = 4;
   console.log(a + b);
7. 7.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the console (d) in the address bar
8. 8.⚡ Which JavaScript word makes a new variable? (a) alert() (b) console.log() (c) if (d) let
9. 9.⚡ What does this code show?
   let name = "Zoya";
   alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Zoya! (c) name (d) Zoya
10. 10.⚡ What number does this code print?
    let a = 18;
    let b = 7;
    console.log(a - b);
11. 11.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Zoya! (d) Zoya
12. 12.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .js (c) .html (d) .jpg
13. 13.⚡ Which word makes a new variable? (a) let (b) make (c) put (d) give
14. 14.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <code> (d) <style>
15. 15.⚡ What does alert() show? (a) a pop-up box (b) a new tab (c) a table (d) a picture
16. 16.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Welcome, Aman! (b) Aman (c) Welcome, name! (d) name
17. 17.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) let (c) console.log() (d) if
18. 18.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Riya (c) Welcome, Riya! (d) name
19. 19.⚡ What number does this code print?
    let a = 48;
    let b = 23;
    console.log(a + b);
20. 20.⚡ Which JavaScript word runs code when true? (a) alert() (b) for (c) if (d) console.log()
21. 21.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) Welcome, Kabir! (b) name (c) Kabir (d) Welcome, name!
22. 22.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) the page title (d) actions and changes
23. 23.⚡ What number does this code print?
    let runs = 8;
    runs = runs + 17;
    runs = runs - 11;
    console.log(runs);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 2;
    console.log(x + y); (a) 10 (b) 82 (c) Error
25. 25.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, Aman! (c) Well done, name! (d) Aman
26. 26.⚡ What number does this code print?
    let marks = 27;
    marks = marks + 11;
    marks = marks - 32;
    console.log(marks);
27. 27.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Kabir! (d) Kabir
28. 28.⚡ What number does this code print?
    let coins = 26;
    coins = coins + 2;
    coins = coins - 13;
    console.log(coins);
29. 29.⚡ What number does this code print?
    let coins = 11;
    coins = coins + 7;
    coins = coins - 4;
    console.log(coins);
30. 30.⚡ What number does this code print?
    let runs = 5;
    runs = runs + 3;
    runs = runs - 5;
    console.log(runs);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 6;
    console.log(x + y); (a) 12 (b) Error (c) 66
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 4;
    console.log(x + y); (a) 11 (b) 74 (c) Error
33. 33.⚡ Which JavaScript word repeats code? (a) console.log() (b) let (c) for (d) if
34. 34.⚡ What number does this code print?
    let books = 28;
    books = books + 3;
    books = books - 20;
    console.log(books);
35. 35.⚡ What number does this code print?
    let a = 60;
    let b = 25;
    console.log(a - b);
36. 36.⚡ What number does this code print?
    let apples = 10;
    apples = apples + 14;
    apples = apples - 11;
    console.log(apples);
37. 37.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Aman (c) Hello, Aman! (d) name
38. 38.⚡ What number does this code print?
    let marks = 10;
    marks = marks + 19;
    marks = marks - 29;
    console.log(marks);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) 8 (b) 35 (c) Error
40. 40.⚡ What number does this code print?
    let a = 18;
    let b = 19;
    console.log(a + b);

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