JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 818 · 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 = 7;
   let b = 4;
   console.log(a * b);
2. 2.⚡ What number does this code print?
   let a = 11;
   let b = 12;
   console.log(a * b);
3. 3.⚡ Which JavaScript word runs code when true? (a) console.log() (b) alert() (c) let (d) if
4. 4.⚡ What number does this code print?
   let a = 45;
   let b = 38;
   console.log(a - b);
5. 5.⚡ What number does this code print?
   let score = 24;
   score = score + 2;
   score = score - 15;
   console.log(score);
6. 6.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <code> (c) <js> (d) <style>
7. 7.⚡ What does this code show?
   let name = "Zoya";
   console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Zoya (d) Welcome, Zoya!
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 4;
   console.log(x + y); (a) 9 (b) 54 (c) Error
9. 9.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) if (d) console.log()
10. 10.⚡ What number does this code print?
    let a = 7;
    let b = 13;
    console.log(a + b);
11. 11.⚡ What number does this code print?
    let a = 4;
    let b = 2;
    console.log(a * b);
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) Error (b) 5 (c) 32
13. 13.⚡ What number does this code print?
    let books = 30;
    books = books + 6;
    books = books - 18;
    console.log(books);
14. 14.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) the page title (d) actions and changes
15. 15.⚡ What number does this code print?
    let coins = 6;
    coins = coins + 11;
    coins = coins - 11;
    console.log(coins);
16. 16.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Well done, Kabir! (b) name (c) Kabir (d) Well done, name!
17. 17.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) Welcome, Arjun! (b) name (c) Arjun (d) Welcome, name!
18. 18.⚡ What number does this code print?
    let a = 10;
    let b = 11;
    console.log(a * b);
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y); (a) Error (b) 9 (c) 18
20. 20.⚡ What number does this code print?
    let a = 5;
    let b = 35;
    console.log(a + b);
21. 21.⚡ Which JavaScript word repeats code? (a) if (b) console.log() (c) alert() (d) for
22. 22.⚡ Which word makes a new variable? (a) put (b) give (c) let (d) make
23. 23.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) Kabir (b) Hi, name! (c) name (d) Hi, Kabir!
24. 24.⚡ What does alert() show? (a) a table (b) a picture (c) a new tab (d) a pop-up box
25. 25.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Aman (b) Hello, Aman! (c) name (d) Hello, name!
26. 26.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .js (d) .jpg
27. 27.⚡ What number does this code print?
    let a = 4;
    let b = 11;
    console.log(a * b);
28. 28.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Meera (d) Welcome, Meera!
29. 29.⚡ Which JavaScript word shows a pop-up box? (a) for (b) console.log() (c) let (d) alert()
30. 30.⚡ What number does this code print?
    let marks = 11;
    marks = marks + 9;
    marks = marks - 16;
    console.log(marks);
31. 31.⚡ What number does this code print?
    let a = 10;
    let b = 8;
    console.log(a * b);
32. 32.⚡ What number does this code print?
    let coins = 5;
    coins = coins + 8;
    coins = coins - 3;
    console.log(coins);
33. 33.⚡ Which JavaScript word makes a new variable? (a) let (b) alert() (c) if (d) for
34. 34.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Meera (c) name (d) Hi, Meera!
35. 35.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) name (b) Arjun (c) Welcome, Arjun! (d) Welcome, name!
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 4;
    console.log(x + y); (a) 34 (b) Error (c) 7
37. 37.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Aman (c) Hello, Aman! (d) name
38. 38.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Well done, Riya! (b) Well done, name! (c) Riya (d) name
39. 39.⚡ What number does this code print?
    let a = 9;
    let b = 5;
    console.log(a * b);
40. 40.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Arjun (b) name (c) Hello, Arjun! (d) Hello, name!

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