JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 790 · 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 tag holds JavaScript in a page? (a) <code> (b) <script> (c) <style> (d) <js>
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 9;
   console.log(x + y); (a) Error (b) 79 (c) 16
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 4;
   console.log(x + y); (a) Error (b) 12 (c) 84
4. 4.⚡ What does this code show?
   let name = "Arjun";
   alert("Hi, " + name + "!"); (a) name (b) Hi, Arjun! (c) Arjun (d) Hi, name!
5. 5.⚡ What number does this code print?
   let books = 7;
   books = books + 13;
   books = books - 4;
   console.log(books);
6. 6.⚡ Which JavaScript word makes a new variable? (a) for (b) console.log() (c) let (d) alert()
7. 7.⚡ What does this code show?
   let name = "Riya";
   console.log("Welcome, " + name + "!"); (a) Welcome, Riya! (b) name (c) Welcome, name! (d) Riya
8. 8.⚡ What number does this code print?
   let a = 60;
   let b = 3;
   console.log(a + b);
9. 9.⚡ What does this code show?
   let name = "Zoya";
   console.log("Hello, " + name + "!"); (a) Zoya (b) name (c) Hello, Zoya! (d) Hello, name!
10. 10.⚡ Which JavaScript word writes in the console? (a) console.log() (b) if (c) for (d) let
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y); (a) Error (b) 44 (c) 8
12. 12.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Aman! (c) Aman (d) name
13. 13.⚡ Which JavaScript word shows a pop-up box? (a) for (b) if (c) console.log() (d) alert()
14. 14.⚡ Which word makes a new variable? (a) give (b) make (c) put (d) let
15. 15.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Riya (b) Well done, Riya! (c) Well done, name! (d) name
16. 16.⚡ What number does this code print?
    let apples = 8;
    apples = apples + 12;
    apples = apples - 6;
    console.log(apples);
17. 17.⚡ Which JavaScript word runs code when true? (a) console.log() (b) for (c) if (d) let
18. 18.⚡ What number does this code print?
    let books = 16;
    books = books + 19;
    books = books - 6;
    console.log(books);
19. 19.⚡ What does JavaScript add to a web page? (a) actions and changes (b) only colours (c) the page title (d) the domain name
20. 20.⚡ What number does this code print?
    let score = 26;
    score = score + 19;
    score = score - 23;
    console.log(score);
21. 21.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .js (c) .html (d) .jpg
22. 22.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Hi, Meera! (b) Meera (c) Hi, name! (d) name
23. 23.⚡ What number does this code print?
    let marks = 11;
    marks = marks + 8;
    marks = marks - 1;
    console.log(marks);
24. 24.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Arjun! (c) Arjun (d) name
25. 25.⚡ Where does console.log() show its output? (a) in the address bar (b) in the console (c) on the printer (d) on the title bar
26. 26.⚡ What number does this code print?
    let a = 8;
    let b = 9;
    console.log(a * b);
27. 27.⚡ What does alert() show? (a) a picture (b) a new tab (c) a table (d) a pop-up box
28. 28.⚡ What number does this code print?
    let a = 19;
    let b = 25;
    console.log(a + b);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) 81 (b) 9 (c) Error
30. 30.⚡ What number does this code print?
    let a = 20;
    let b = 20;
    console.log(a + b);
31. 31.⚡ What number does this code print?
    let a = 16;
    let b = 13;
    console.log(a + b);
32. 32.⚡ What number does this code print?
    let a = 25;
    let b = 39;
    console.log(a + b);
33. 33.⚡ What number does this code print?
    let coins = 20;
    coins = coins + 4;
    coins = coins - 10;
    console.log(coins);
34. 34.⚡ Which JavaScript word repeats code? (a) if (b) for (c) let (d) console.log()
35. 35.⚡ What number does this code print?
    let runs = 19;
    runs = runs + 15;
    runs = runs - 19;
    console.log(runs);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 6;
    console.log(x + y); (a) Error (b) 14 (c) 86
37. 37.⚡ What number does this code print?
    let a = 19;
    let b = 8;
    console.log(a - b);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) 13 (b) Error (c) 4
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 1;
    console.log(x + y); (a) Error (b) 8 (c) 71
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 4;
    console.log(x + y); (a) 10 (b) Error (c) 64

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