JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 294 · 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 shows a pop-up box? (a) for (b) let (c) alert() (d) console.log()
2. 2.⚡ What number does this code print?
   let a = 6;
   let b = 10;
   console.log(a * b);
3. 3.⚡ Which JavaScript word repeats code? (a) for (b) if (c) console.log() (d) alert()
4. 4.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <script> (d) <code>
5. 5.⚡ Which JavaScript word runs code when true? (a) if (b) let (c) console.log() (d) alert()
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 7;
   console.log(x + y); (a) Error (b) 87 (c) 15
7. 7.⚡ What does this code show?
   let name = "Meera";
   alert("Well done, " + name + "!"); (a) Meera (b) Well done, name! (c) name (d) Well done, Meera!
8. 8.⚡ What does this code show?
   let name = "Zoya";
   alert("Well done, " + name + "!"); (a) Well done, name! (b) Zoya (c) name (d) Well done, Zoya!
9. 9.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the console (d) in the address bar
10. 10.⚡ What number does this code print?
    let a = 38;
    let b = 38;
    console.log(a + b);
11. 11.⚡ What number does this code print?
    let apples = 6;
    apples = apples + 20;
    apples = apples - 17;
    console.log(apples);
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 7;
    console.log(x + y); (a) 11 (b) Error (c) 47
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 4;
    console.log(x + y); (a) 11 (b) Error (c) 74
14. 14.⚡ What number does this code print?
    let a = 12;
    let b = 3;
    console.log(a * b);
15. 15.⚡ What number does this code print?
    let a = 56;
    let b = 34;
    console.log(a + b);
16. 16.⚡ What number does this code print?
    let a = 12;
    let b = 9;
    console.log(a * b);
17. 17.⚡ What number does this code print?
    let coins = 17;
    coins = coins + 17;
    coins = coins - 4;
    console.log(coins);
18. 18.⚡ What does alert() show? (a) a table (b) a picture (c) a pop-up box (d) a new tab
19. 19.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) for (c) let (d) if
20. 20.⚡ What number does this code print?
    let a = 8;
    let b = 4;
    console.log(a * b);
21. 21.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) Hi, Zoya! (b) Zoya (c) name (d) Hi, name!
22. 22.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Aman! (d) Aman
23. 23.⚡ What number does this code print?
    let apples = 25;
    apples = apples + 6;
    apples = apples - 12;
    console.log(apples);
24. 24.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .css (c) .html (d) .jpg
25. 25.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Riya (d) Hi, Riya!
26. 26.⚡ What number does this code print?
    let marks = 26;
    marks = marks + 8;
    marks = marks - 10;
    console.log(marks);
27. 27.⚡ What does JavaScript add to a web page? (a) the page title (b) only colours (c) actions and changes (d) the domain name
28. 28.⚡ What number does this code print?
    let books = 15;
    books = books + 5;
    books = books - 8;
    console.log(books);
29. 29.⚡ What number does this code print?
    let a = 53;
    let b = 30;
    console.log(a + b);
30. 30.⚡ 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
31. 31.⚡ What number does this code print?
    let a = 9;
    let b = 11;
    console.log(a * b);
32. 32.⚡ What number does this code print?
    let a = 50;
    let b = 3;
    console.log(a + b);
33. 33.⚡ What number does this code print?
    let books = 6;
    books = books + 17;
    books = books - 23;
    console.log(books);
34. 34.⚡ What number does this code print?
    let a = 17;
    let b = 9;
    console.log(a + b);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 7;
    console.log(x + y); (a) 27 (b) 9 (c) Error
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y); (a) 51 (b) 6 (c) Error
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 9;
    console.log(x + y); (a) 39 (b) 12 (c) Error
38. 38.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Zoya (c) name (d) Hello, Zoya!
39. 39.⚡ What number does this code print?
    let score = 10;
    score = score + 9;
    score = score - 11;
    console.log(score);
40. 40.⚡ Which JavaScript word writes in the console? (a) if (b) for (c) console.log() (d) let

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