JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 162 · 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 writes in the console? (a) alert() (b) for (c) let (d) console.log()
2. 2.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) let (c) for (d) alert()
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 4;
   console.log(x + y); (a) 6 (b) 24 (c) Error
4. 4.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <style> (c) <script> (d) <js>
5. 5.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) actions and changes (d) the page title
6. 6.⚡ Which JavaScript word makes a new variable? (a) let (b) alert() (c) console.log() (d) for
7. 7.⚡ What number does this code print?
   let a = 8;
   let b = 7;
   console.log(a * b);
8. 8.⚡ What number does this code print?
   let books = 9;
   books = books + 15;
   books = books - 13;
   console.log(books);
9. 9.⚡ What number does this code print?
   let a = 22;
   let b = 2;
   console.log(a + b);
10. 10.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Aman (b) Hello, name! (c) Hello, Aman! (d) name
11. 11.⚡ What number does this code print?
    let a = 9;
    let b = 1;
    console.log(a + b);
12. 12.⚡ What number does this code print?
    let a = 59;
    let b = 27;
    console.log(a - b);
13. 13.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) name (b) Riya (c) Hi, name! (d) Hi, Riya!
14. 14.⚡ What number does this code print?
    let a = 12;
    let b = 11;
    console.log(a - b);
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 2;
    console.log(x + y); (a) Error (b) 42 (c) 6
16. 16.⚡ What number does this code print?
    let a = 54;
    let b = 31;
    console.log(a + b);
17. 17.⚡ Which JavaScript word runs code when true? (a) for (b) console.log() (c) if (d) let
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 3;
    console.log(x + y); (a) 53 (b) Error (c) 8
19. 19.⚡ What number does this code print?
    let runs = 9;
    runs = runs + 8;
    runs = runs - 12;
    console.log(runs);
20. 20.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Meera (c) Hello, Meera! (d) name
21. 21.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a new tab (d) a picture
22. 22.⚡ What number does this code print?
    let score = 28;
    score = score + 8;
    score = score - 16;
    console.log(score);
23. 23.⚡ What number does this code print?
    let a = 11;
    let b = 17;
    console.log(a + b);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 7;
    console.log(x + y); (a) 47 (b) 11 (c) Error
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y); (a) 11 (b) 83 (c) Error
26. 26.⚡ What number does this code print?
    let a = 25;
    let b = 8;
    console.log(a + b);
27. 27.⚡ What number does this code print?
    let apples = 10;
    apples = apples + 12;
    apples = apples - 9;
    console.log(apples);
28. 28.⚡ What number does this code print?
    let a = 3;
    let b = 9;
    console.log(a * b);
29. 29.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Arjun! (d) Arjun
30. 30.⚡ Which JavaScript word repeats code? (a) if (b) console.log() (c) for (d) let
31. 31.⚡ What number does this code print?
    let a = 9;
    let b = 3;
    console.log(a + b);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 1;
    console.log(x + y); (a) 71 (b) Error (c) 8
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y); (a) Error (b) 22 (c) 4
34. 34.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Well done, Riya! (b) name (c) Well done, name! (d) Riya
35. 35.⚡ Which word makes a new variable? (a) let (b) make (c) put (d) give
36. 36.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) Arjun (b) Hello, Arjun! (c) name (d) Hello, name!
37. 37.⚡ What number does this code print?
    let apples = 28;
    apples = apples + 10;
    apples = apples - 17;
    console.log(apples);
38. 38.⚡ What number does this code print?
    let a = 24;
    let b = 13;
    console.log(a - b);
39. 39.⚡ What number does this code print?
    let a = 12;
    let b = 3;
    console.log(a * b);
40. 40.⚡ What number does this code print?
    let runs = 19;
    runs = runs + 9;
    runs = runs - 14;
    console.log(runs);

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