JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 775 · 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 number does this code print?
   let a = 15;
   let b = 13;
   console.log(a - b);
2. 2.⚡ Which JavaScript word runs code when true? (a) alert() (b) let (c) for (d) if
3. 3.⚡ What number does this code print?
   let a = 24;
   let b = 16;
   console.log(a + b);
4. 4.⚡ Which JavaScript word repeats code? (a) for (b) let (c) console.log() (d) if
5. 5.⚡ What number does this code print?
   let coins = 15;
   coins = coins + 18;
   coins = coins - 14;
   console.log(coins);
6. 6.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <style> (c) <script> (d) <js>
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 2;
   console.log(x + y); (a) 5 (b) Error (c) 32
8. 8.⚡ What number does this code print?
   let a = 5;
   let b = 8;
   console.log(a * b);
9. 9.⚡ What does this code show?
   let name = "Arjun";
   console.log("Hello, " + name + "!"); (a) Arjun (b) name (c) Hello, Arjun! (d) Hello, name!
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 9;
    console.log(x + y); (a) Error (b) 59 (c) 14
11. 11.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Kabir (d) Hi, Kabir!
12. 12.⚡ What number does this code print?
    let a = 4;
    let b = 4;
    console.log(a * b);
13. 13.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) only colours (d) actions and changes
14. 14.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .jpg (c) .js (d) .css
15. 15.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the address bar (d) in the console
16. 16.⚡ What does alert() show? (a) a table (b) a picture (c) a new tab (d) a pop-up box
17. 17.⚡ 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
18. 18.⚡ Which JavaScript word makes a new variable? (a) alert() (b) for (c) let (d) if
19. 19.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Riya (d) Welcome, Riya!
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 7;
    console.log(x + y); (a) Error (b) 15 (c) 87
21. 21.⚡ Which JavaScript word shows a pop-up box? (a) let (b) alert() (c) console.log() (d) if
22. 22.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Riya! (d) Riya
23. 23.⚡ What number does this code print?
    let score = 26;
    score = score + 2;
    score = score - 3;
    console.log(score);
24. 24.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Hello, Kabir! (b) Kabir (c) name (d) Hello, name!
25. 25.⚡ What number does this code print?
    let a = 8;
    let b = 2;
    console.log(a * b);
26. 26.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Aman! (c) name (d) Aman
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 5;
    console.log(x + y); (a) 13 (b) 85 (c) Error
28. 28.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Hi, Aman! (b) Aman (c) name (d) Hi, name!
29. 29.⚡ What number does this code print?
    let books = 29;
    books = books + 16;
    books = books - 11;
    console.log(books);
30. 30.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Zoya! (c) Zoya (d) name
31. 31.⚡ What number does this code print?
    let a = 34;
    let b = 23;
    console.log(a + b);
32. 32.⚡ What number does this code print?
    let score = 29;
    score = score + 5;
    score = score - 8;
    console.log(score);
33. 33.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Meera (b) Hi, Meera! (c) Hi, name! (d) name
34. 34.⚡ What number does this code print?
    let score = 6;
    score = score + 16;
    score = score - 13;
    console.log(score);
35. 35.⚡ What number does this code print?
    let books = 18;
    books = books + 3;
    books = books - 6;
    console.log(books);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 8;
    console.log(x + y); (a) 13 (b) 58 (c) Error
37. 37.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Aman (c) name (d) Welcome, Aman!
38. 38.⚡ What number does this code print?
    let a = 40;
    let b = 20;
    console.log(a - b);
39. 39.⚡ What number does this code print?
    let a = 38;
    let b = 14;
    console.log(a - b);
40. 40.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Kabir (b) Welcome, name! (c) name (d) Welcome, Kabir!

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