JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 158 · 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("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Aman! (c) name (d) Aman
2. 2.⚡ 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
3. 3.⚡ What number does this code print?
   let a = 34;
   let b = 23;
   console.log(a + b);
4. 4.⚡ What number does this code print?
   let books = 26;
   books = books + 15;
   books = books - 5;
   console.log(books);
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 6;
   console.log(x + y); (a) 9 (b) 36 (c) Error
6. 6.⚡ Which JavaScript word runs code when true? (a) console.log() (b) alert() (c) let (d) if
7. 7.⚡ 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
8. 8.⚡ What does this code show?
   let name = "Arjun";
   console.log("Hi, " + name + "!"); (a) name (b) Hi, Arjun! (c) Hi, name! (d) Arjun
9. 9.⚡ Which word makes a new variable? (a) put (b) give (c) make (d) let
10. 10.⚡ Which JavaScript word repeats code? (a) let (b) if (c) for (d) console.log()
11. 11.⚡ What number does this code print?
    let a = 48;
    let b = 35;
    console.log(a + b);
12. 12.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Aman (c) Well done, Aman! (d) name
13. 13.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .js (d) .html
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y); (a) 91 (b) 10 (c) Error
15. 15.⚡ Which JavaScript word writes in the console? (a) alert() (b) console.log() (c) let (d) for
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 7;
    console.log(x + y); (a) 8 (b) Error (c) 17
17. 17.⚡ What number does this code print?
    let a = 57;
    let b = 11;
    console.log(a - b);
18. 18.⚡ What number does this code print?
    let a = 38;
    let b = 8;
    console.log(a + b);
19. 19.⚡ What number does this code print?
    let a = 12;
    let b = 5;
    console.log(a * b);
20. 20.⚡ What number does this code print?
    let a = 33;
    let b = 9;
    console.log(a + b);
21. 21.⚡ What number does this code print?
    let a = 54;
    let b = 26;
    console.log(a + b);
22. 22.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <script> (c) <style> (d) <code>
23. 23.⚡ Which JavaScript word shows a pop-up box? (a) for (b) alert() (c) if (d) let
24. 24.⚡ 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
25. 25.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Aman (b) Welcome, Aman! (c) name (d) Welcome, name!
26. 26.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, Zoya! (c) Hello, name! (d) Zoya
27. 27.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) alert() (c) let (d) if
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 4;
    console.log(x + y); (a) 84 (b) 12 (c) Error
29. 29.⚡ What number does this code print?
    let score = 13;
    score = score + 2;
    score = score - 3;
    console.log(score);
30. 30.⚡ What does JavaScript add to a web page? (a) only colours (b) actions and changes (c) the domain name (d) the page title
31. 31.⚡ What number does this code print?
    let a = 19;
    let b = 20;
    console.log(a + b);
32. 32.⚡ What number does this code print?
    let runs = 17;
    runs = runs + 2;
    runs = runs - 5;
    console.log(runs);
33. 33.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) Welcome, Arjun! (b) Welcome, name! (c) Arjun (d) name
34. 34.⚡ What number does this code print?
    let runs = 24;
    runs = runs + 16;
    runs = runs - 9;
    console.log(runs);
35. 35.⚡ What number does this code print?
    let a = 49;
    let b = 11;
    console.log(a - b);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) 32 (b) Error (c) 5
37. 37.⚡ What number does this code print?
    let a = 4;
    let b = 8;
    console.log(a * b);
38. 38.⚡ What number does this code print?
    let a = 5;
    let b = 6;
    console.log(a * b);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y); (a) 62 (b) 8 (c) Error
40. 40.⚡ What does alert() show? (a) a new tab (b) a picture (c) a table (d) a pop-up box

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