JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 332 · 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.⚡ Where does console.log() show its output? (a) in the console (b) in the address bar (c) on the printer (d) on the title bar
2. 2.⚡ What does this code show?
   let name = "Riya";
   console.log("Well done, " + name + "!"); (a) name (b) Well done, Riya! (c) Well done, name! (d) Riya
3. 3.⚡ What does this code show?
   let name = "Zoya";
   alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Zoya (d) Hello, Zoya!
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 8;
   console.log(x + y); (a) 88 (b) Error (c) 16
5. 5.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <script> (c) <code> (d) <style>
6. 6.⚡ Which JavaScript word repeats code? (a) alert() (b) let (c) for (d) if
7. 7.⚡ What number does this code print?
   let coins = 26;
   coins = coins + 16;
   coins = coins - 23;
   console.log(coins);
8. 8.⚡ Which JavaScript word writes in the console? (a) for (b) if (c) alert() (d) console.log()
9. 9.⚡ Which JavaScript word makes a new variable? (a) let (b) alert() (c) console.log() (d) if
10. 10.⚡ What number does this code print?
    let books = 5;
    books = books + 7;
    books = books - 4;
    console.log(books);
11. 11.⚡ What number does this code print?
    let score = 20;
    score = score + 3;
    score = score - 4;
    console.log(score);
12. 12.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .js (d) .jpg
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) 41 (b) 5 (c) Error
14. 14.⚡ Which JavaScript word runs code when true? (a) console.log() (b) if (c) alert() (d) for
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) 9 (b) 72 (c) Error
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) 43 (b) Error (c) 7
17. 17.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Meera! (c) name (d) Meera
18. 18.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Riya (c) name (d) Well done, Riya!
19. 19.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Zoya! (d) Zoya
20. 20.⚡ What number does this code print?
    let a = 7;
    let b = 3;
    console.log(a * b);
21. 21.⚡ What number does this code print?
    let a = 39;
    let b = 15;
    console.log(a - b);
22. 22.⚡ What number does this code print?
    let a = 17;
    let b = 13;
    console.log(a + b);
23. 23.⚡ What number does this code print?
    let a = 2;
    let b = 10;
    console.log(a * b);
24. 24.⚡ What number does this code print?
    let a = 11;
    let b = 4;
    console.log(a * b);
25. 25.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) the page title (d) actions and changes
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) Error (b) 32 (c) 5
27. 27.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Aman! (d) Aman
28. 28.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Hi, Kabir! (b) Hi, name! (c) Kabir (d) name
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 5;
    console.log(x + y); (a) 85 (b) 13 (c) Error
30. 30.⚡ What number does this code print?
    let a = 54;
    let b = 33;
    console.log(a + b);
31. 31.⚡ What number does this code print?
    let a = 2;
    let b = 8;
    console.log(a * b);
32. 32.⚡ Which JavaScript word shows a pop-up box? (a) let (b) alert() (c) console.log() (d) for
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 4;
    console.log(x + y); (a) Error (b) 24 (c) 6
34. 34.⚡ What number does this code print?
    let a = 48;
    let b = 34;
    console.log(a + b);
35. 35.⚡ What number does this code print?
    let a = 11;
    let b = 1;
    console.log(a - b);
36. 36.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) Welcome, Kabir! (b) name (c) Kabir (d) Welcome, name!
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 6;
    console.log(x + y); (a) 15 (b) 96 (c) Error
38. 38.⚡ What number does this code print?
    let books = 29;
    books = books + 2;
    books = books - 8;
    console.log(books);
39. 39.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Kabir (b) name (c) Hello, Kabir! (d) Hello, name!
40. 40.⚡ What number does this code print?
    let runs = 6;
    runs = runs + 17;
    runs = runs - 12;
    console.log(runs);

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