JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 544 · 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) <js> (b) <script> (c) <code> (d) <style>
2. 2.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) alert() (c) let (d) if
3. 3.⚡ What number does this code print?
   let a = 2;
   let b = 4;
   console.log(a * b);
4. 4.⚡ Which JavaScript word runs code when true? (a) for (b) console.log() (c) alert() (d) if
5. 5.⚡ What number does this code print?
   let coins = 9;
   coins = coins + 15;
   coins = coins - 6;
   console.log(coins);
6. 6.⚡ What does this code show?
   let name = "Arjun";
   alert("Hello, " + name + "!"); (a) Arjun (b) Hello, name! (c) name (d) Hello, Arjun!
7. 7.⚡ What number does this code print?
   let a = 14;
   let b = 14;
   console.log(a + b);
8. 8.⚡ What number does this code print?
   let score = 25;
   score = score + 13;
   score = score - 9;
   console.log(score);
9. 9.⚡ Which JavaScript word makes a new variable? (a) alert() (b) console.log() (c) let (d) if
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 3;
    console.log(x + y); (a) Error (b) 53 (c) 8
11. 11.⚡ What number does this code print?
    let a = 14;
    let b = 36;
    console.log(a + b);
12. 12.⚡ What number does this code print?
    let a = 5;
    let b = 19;
    console.log(a + b);
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 9;
    console.log(x + y); (a) 12 (b) 39 (c) Error
14. 14.⚡ Which word makes a new variable? (a) put (b) let (c) give (d) make
15. 15.⚡ What number does this code print?
    let a = 41;
    let b = 38;
    console.log(a + b);
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 6;
    console.log(x + y); (a) 8 (b) Error (c) 26
17. 17.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Riya (b) name (c) Hi, name! (d) Hi, Riya!
18. 18.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) name (b) Aman (c) Hello, Aman! (d) Hello, name!
19. 19.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Riya! (c) Riya (d) name
20. 20.⚡ What number does this code print?
    let a = 48;
    let b = 20;
    console.log(a - b);
21. 21.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Kabir (b) Well done, Kabir! (c) name (d) Well done, name!
22. 22.⚡ What number does this code print?
    let score = 10;
    score = score + 7;
    score = score - 11;
    console.log(score);
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 7;
    console.log(x + y); (a) 77 (b) Error (c) 14
24. 24.⚡ What number does this code print?
    let a = 11;
    let b = 22;
    console.log(a + b);
25. 25.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .html (c) .css (d) .jpg
26. 26.⚡ What number does this code print?
    let a = 18;
    let b = 38;
    console.log(a + b);
27. 27.⚡ What does JavaScript add to a web page? (a) only colours (b) the page title (c) the domain name (d) actions and changes
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y); (a) 36 (b) 9 (c) Error
29. 29.⚡ What number does this code print?
    let a = 53;
    let b = 22;
    console.log(a - b);
30. 30.⚡ 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
31. 31.⚡ What number does this code print?
    let a = 15;
    let b = 1;
    console.log(a + b);
32. 32.⚡ What number does this code print?
    let a = 34;
    let b = 25;
    console.log(a - b);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) 35 (b) 8 (c) Error
34. 34.⚡ 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
35. 35.⚡ What number does this code print?
    let marks = 18;
    marks = marks + 15;
    marks = marks - 5;
    console.log(marks);
36. 36.⚡ What number does this code print?
    let a = 51;
    let b = 37;
    console.log(a - b);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 5;
    console.log(x + y); (a) 75 (b) 12 (c) Error
38. 38.⚡ What number does this code print?
    let runs = 11;
    runs = runs + 6;
    runs = runs - 9;
    console.log(runs);
39. 39.⚡ Which JavaScript word repeats code? (a) for (b) if (c) let (d) console.log()
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) Error (b) 21 (c) 3

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