JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 8 · 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 books = 11;
   books = books + 6;
   books = books - 7;
   console.log(books);
2. 2.⚡ What number does this code print?
   let score = 23;
   score = score + 12;
   score = score - 23;
   console.log(score);
3. 3.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) on the title bar (d) in the console
4. 4.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <style> (d) <js>
5. 5.⚡ Which JavaScript word writes in the console? (a) let (b) for (c) alert() (d) console.log()
6. 6.⚡ What does alert() show? (a) a new tab (b) a picture (c) a pop-up box (d) a table
7. 7.⚡ Which JavaScript word shows a pop-up box? (a) if (b) console.log() (c) alert() (d) let
8. 8.⚡ What does this code show?
   let name = "Kabir";
   alert("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Hello, Kabir! (d) Kabir
9. 9.⚡ What does this code show?
   let name = "Kabir";
   console.log("Welcome, " + name + "!"); (a) Kabir (b) Welcome, Kabir! (c) Welcome, name! (d) name
10. 10.⚡ What number does this code print?
    let a = 8;
    let b = 29;
    console.log(a + b);
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) 41 (b) Error (c) 5
12. 12.⚡ What number does this code print?
    let runs = 18;
    runs = runs + 9;
    runs = runs - 24;
    console.log(runs);
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y); (a) 11 (b) Error (c) 83
14. 14.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, Kabir! (c) Kabir (d) Welcome, name!
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) Error (b) 81 (c) 9
16. 16.⚡ What number does this code print?
    let a = 44;
    let b = 27;
    console.log(a - b);
17. 17.⚡ Which JavaScript word repeats code? (a) if (b) let (c) for (d) alert()
18. 18.⚡ Which JavaScript word makes a new variable? (a) for (b) console.log() (c) let (d) alert()
19. 19.⚡ What number does this code print?
    let marks = 27;
    marks = marks + 7;
    marks = marks - 18;
    console.log(marks);
20. 20.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) only colours (d) actions and changes
21. 21.⚡ What number does this code print?
    let a = 9;
    let b = 3;
    console.log(a * b);
22. 22.⚡ What number does this code print?
    let score = 8;
    score = score + 13;
    score = score - 2;
    console.log(score);
23. 23.⚡ What number does this code print?
    let coins = 23;
    coins = coins + 9;
    coins = coins - 8;
    console.log(coins);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y); (a) 4 (b) Error (c) 22
25. 25.⚡ What number does this code print?
    let a = 17;
    let b = 20;
    console.log(a + b);
26. 26.⚡ What number does this code print?
    let marks = 5;
    marks = marks + 17;
    marks = marks - 10;
    console.log(marks);
27. 27.⚡ What number does this code print?
    let a = 5;
    let b = 5;
    console.log(a * b);
28. 28.⚡ Which JavaScript word runs code when true? (a) if (b) let (c) alert() (d) console.log()
29. 29.⚡ What number does this code print?
    let score = 8;
    score = score + 14;
    score = score - 4;
    console.log(score);
30. 30.⚡ Which word makes a new variable? (a) give (b) let (c) make (d) put
31. 31.⚡ What number does this code print?
    let a = 32;
    let b = 14;
    console.log(a + b);
32. 32.⚡ What number does this code print?
    let runs = 7;
    runs = runs + 17;
    runs = runs - 4;
    console.log(runs);
33. 33.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Aman (d) Well done, Aman!
34. 34.⚡ What number does this code print?
    let a = 33;
    let b = 32;
    console.log(a - b);
35. 35.⚡ What number does this code print?
    let a = 40;
    let b = 13;
    console.log(a - b);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 4;
    console.log(x + y); (a) 74 (b) Error (c) 11
37. 37.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) name (b) Arjun (c) Welcome, name! (d) Welcome, Arjun!
38. 38.⚡ What number does this code print?
    let books = 26;
    books = books + 20;
    books = books - 40;
    console.log(books);
39. 39.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) name (b) Riya (c) Well done, Riya! (d) Well done, name!
40. 40.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Riya (b) Hello, Riya! (c) Hello, name! (d) name

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