JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 705 · 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 does this code show?
   let name = "Aman";
   console.log("Welcome, " + name + "!"); (a) Aman (b) name (c) Welcome, Aman! (d) Welcome, name!
2. 2.⚡ What number does this code print?
   let books = 30;
   books = books + 17;
   books = books - 45;
   console.log(books);
3. 3.⚡ What number does this code print?
   let apples = 12;
   apples = apples + 4;
   apples = apples - 4;
   console.log(apples);
4. 4.⚡ What does alert() show? (a) a table (b) a picture (c) a pop-up box (d) a new tab
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 1;
   console.log(x + y); (a) Error (b) 4 (c) 31
6. 6.⚡ What does this code show?
   let name = "Kabir";
   console.log("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Kabir! (c) Kabir (d) name
7. 7.⚡ What number does this code print?
   let coins = 22;
   coins = coins + 2;
   coins = coins - 6;
   console.log(coins);
8. 8.⚡ Which JavaScript word makes a new variable? (a) let (b) console.log() (c) if (d) for
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 6;
   console.log(x + y); (a) 13 (b) 76 (c) Error
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) 81 (b) 9 (c) Error
11. 11.⚡ Which JavaScript word runs code when true? (a) alert() (b) for (c) if (d) let
12. 12.⚡ 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
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 7;
    console.log(x + y); (a) Error (b) 11 (c) 47
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 8;
    console.log(x + y); (a) 10 (b) Error (c) 28
15. 15.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) name (b) Aman (c) Hi, Aman! (d) Hi, name!
16. 16.⚡ What number does this code print?
    let books = 28;
    books = books + 7;
    books = books - 24;
    console.log(books);
17. 17.⚡ What number does this code print?
    let score = 13;
    score = score + 3;
    score = score - 16;
    console.log(score);
18. 18.⚡ What number does this code print?
    let a = 55;
    let b = 36;
    console.log(a - b);
19. 19.⚡ What number does this code print?
    let marks = 26;
    marks = marks + 19;
    marks = marks - 29;
    console.log(marks);
20. 20.⚡ What number does this code print?
    let score = 24;
    score = score + 2;
    score = score - 18;
    console.log(score);
21. 21.⚡ What number does this code print?
    let books = 27;
    books = books + 4;
    books = books - 28;
    console.log(books);
22. 22.⚡ What number does this code print?
    let a = 59;
    let b = 34;
    console.log(a + b);
23. 23.⚡ Which JavaScript word repeats code? (a) for (b) let (c) console.log() (d) if
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 5;
    console.log(x + y); (a) Error (b) 15 (c) 6
25. 25.⚡ Which word makes a new variable? (a) make (b) put (c) let (d) give
26. 26.⚡ What number does this code print?
    let a = 21;
    let b = 5;
    console.log(a - b);
27. 27.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) Arjun (b) Hello, name! (c) name (d) Hello, Arjun!
28. 28.⚡ What number does this code print?
    let coins = 14;
    coins = coins + 11;
    coins = coins - 19;
    console.log(coins);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) 72 (b) 9 (c) Error
30. 30.⚡ What number does this code print?
    let apples = 22;
    apples = apples + 3;
    apples = apples - 18;
    console.log(apples);
31. 31.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Zoya! (d) Zoya
32. 32.⚡ What number does this code print?
    let a = 19;
    let b = 14;
    console.log(a + b);
33. 33.⚡ What number does this code print?
    let coins = 13;
    coins = coins + 6;
    coins = coins - 5;
    console.log(coins);
34. 34.⚡ Which JavaScript word shows a pop-up box? (a) if (b) console.log() (c) for (d) alert()
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 9;
    console.log(x + y); (a) 10 (b) 19 (c) Error
36. 36.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Kabir (d) Welcome, Kabir!
37. 37.⚡ What number does this code print?
    let score = 10;
    score = score + 3;
    score = score - 4;
    console.log(score);
38. 38.⚡ What number does this code print?
    let coins = 21;
    coins = coins + 4;
    coins = coins - 15;
    console.log(coins);
39. 39.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) only colours (d) actions and changes
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) 8 (b) Error (c) 35

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