JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 575 · 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 runs = 27;
   runs = runs + 12;
   runs = runs - 1;
   console.log(runs);
2. 2.⚡ What number does this code print?
   let marks = 12;
   marks = marks + 8;
   marks = marks - 19;
   console.log(marks);
3. 3.⚡ Which JavaScript word writes in the console? (a) let (b) for (c) console.log() (d) if
4. 4.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <style> (d) <script>
5. 5.⚡ What does this code show?
   let name = "Kabir";
   console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Kabir! (d) Kabir
6. 6.⚡ What number does this code print?
   let runs = 29;
   runs = runs + 19;
   runs = runs - 43;
   console.log(runs);
7. 7.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) let (c) if (d) for
8. 8.⚡ What does this code show?
   let name = "Riya";
   alert("Hello, " + name + "!"); (a) Riya (b) name (c) Hello, Riya! (d) Hello, name!
9. 9.⚡ Which word makes a new variable? (a) make (b) let (c) put (d) give
10. 10.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) actions and changes (d) only colours
11. 11.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Aman! (c) name (d) Aman
12. 12.⚡ What number does this code print?
    let a = 11;
    let b = 4;
    console.log(a * b);
13. 13.⚡ What number does this code print?
    let coins = 20;
    coins = coins + 4;
    coins = coins - 18;
    console.log(coins);
14. 14.⚡ What number does this code print?
    let a = 35;
    let b = 4;
    console.log(a + b);
15. 15.⚡ Which JavaScript word runs code when true? (a) let (b) console.log() (c) for (d) if
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 3;
    console.log(x + y); (a) 10 (b) Error (c) 73
17. 17.⚡ What number does this code print?
    let a = 12;
    let b = 2;
    console.log(a * b);
18. 18.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .css (d) .js
19. 19.⚡ What number does this code print?
    let books = 28;
    books = books + 3;
    books = books - 12;
    console.log(books);
20. 20.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) name (b) Arjun (c) Hi, Arjun! (d) Hi, name!
21. 21.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Zoya (b) Hello, Zoya! (c) Hello, name! (d) name
22. 22.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) Meera (b) name (c) Well done, name! (d) Well done, Meera!
23. 23.⚡ What number does this code print?
    let a = 39;
    let b = 38;
    console.log(a + b);
24. 24.⚡ What number does this code print?
    let score = 6;
    score = score + 4;
    score = score - 7;
    console.log(score);
25. 25.⚡ Which JavaScript word repeats code? (a) let (b) console.log() (c) alert() (d) for
26. 26.⚡ What number does this code print?
    let score = 28;
    score = score + 8;
    score = score - 6;
    console.log(score);
27. 27.⚡ Where does console.log() show its output? (a) on the title bar (b) in the address bar (c) on the printer (d) in the console
28. 28.⚡ What number does this code print?
    let apples = 13;
    apples = apples + 10;
    apples = apples - 14;
    console.log(apples);
29. 29.⚡ Which JavaScript word shows a pop-up box? (a) if (b) console.log() (c) alert() (d) let
30. 30.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, Aman! (c) Aman (d) Hello, name!
31. 31.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Aman (b) name (c) Welcome, Aman! (d) Welcome, name!
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 3;
    console.log(x + y); (a) 8 (b) 53 (c) Error
33. 33.⚡ What number does this code print?
    let a = 32;
    let b = 27;
    console.log(a + b);
34. 34.⚡ What number does this code print?
    let books = 29;
    books = books + 3;
    books = books - 24;
    console.log(books);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 5;
    console.log(x + y); (a) Error (b) 25 (c) 7
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 7;
    console.log(x + y); (a) 9 (b) 27 (c) Error
37. 37.⚡ What number does this code print?
    let coins = 19;
    coins = coins + 15;
    coins = coins - 6;
    console.log(coins);
38. 38.⚡ What number does this code print?
    let coins = 6;
    coins = coins + 10;
    coins = coins - 11;
    console.log(coins);
39. 39.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Meera! (d) Meera
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 4;
    console.log(x + y); (a) 6 (b) 24 (c) Error

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