JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 296 · 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.⚡ Which JavaScript word makes a new variable? (a) let (b) alert() (c) for (d) console.log()
2. 2.⚡ Which JavaScript word writes in the console? (a) if (b) for (c) console.log() (d) let
3. 3.⚡ What number does this code print?
   let a = 47;
   let b = 4;
   console.log(a + b);
4. 4.⚡ Which JavaScript word repeats code? (a) let (b) for (c) console.log() (d) if
5. 5.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) console.log() (c) for (d) if
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 4;
   console.log(x + y); (a) 7 (b) Error (c) 34
7. 7.⚡ What number does this code print?
   let a = 44;
   let b = 11;
   console.log(a + b);
8. 8.⚡ What number does this code print?
   let apples = 11;
   apples = apples + 15;
   apples = apples - 3;
   console.log(apples);
9. 9.⚡ What number does this code print?
   let a = 4;
   let b = 9;
   console.log(a * b);
10. 10.⚡ What number does this code print?
    let coins = 17;
    coins = coins + 2;
    coins = coins - 9;
    console.log(coins);
11. 11.⚡ What number does this code print?
    let score = 12;
    score = score + 19;
    score = score - 13;
    console.log(score);
12. 12.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, Riya! (b) Riya (c) name (d) Hello, name!
13. 13.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) actions and changes (d) the page title
14. 14.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) name (b) Well done, Meera! (c) Meera (d) Well done, name!
15. 15.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Hi, Kabir! (b) Hi, name! (c) Kabir (d) name
16. 16.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <script> (d) <style>
17. 17.⚡ What number does this code print?
    let a = 24;
    let b = 3;
    console.log(a - b);
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 6;
    console.log(x + y); (a) Error (b) 8 (c) 26
19. 19.⚡ Which JavaScript word runs code when true? (a) for (b) if (c) let (d) alert()
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) Error (b) 56 (c) 11
21. 21.⚡ What number does this code print?
    let a = 53;
    let b = 1;
    console.log(a - b);
22. 22.⚡ What number does this code print?
    let apples = 24;
    apples = apples + 8;
    apples = apples - 15;
    console.log(apples);
23. 23.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Aman! (c) Aman (d) name
24. 24.⚡ What number does this code print?
    let books = 8;
    books = books + 8;
    books = books - 7;
    console.log(books);
25. 25.⚡ What number does this code print?
    let a = 10;
    let b = 5;
    console.log(a * b);
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 6;
    console.log(x + y); (a) Error (b) 15 (c) 96
27. 27.⚡ What number does this code print?
    let apples = 24;
    apples = apples + 8;
    apples = apples - 17;
    console.log(apples);
28. 28.⚡ What number does this code print?
    let a = 44;
    let b = 22;
    console.log(a + b);
29. 29.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Arjun (d) Hello, Arjun!
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) Error (b) 8 (c) 35
31. 31.⚡ What does alert() show? (a) a new tab (b) a picture (c) a pop-up box (d) a table
32. 32.⚡ Where does console.log() show its output? (a) in the address bar (b) in the console (c) on the title bar (d) on the printer
33. 33.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) Arjun (b) name (c) Welcome, Arjun! (d) Welcome, name!
34. 34.⚡ What number does this code print?
    let marks = 5;
    marks = marks + 18;
    marks = marks - 8;
    console.log(marks);
35. 35.⚡ What number does this code print?
    let a = 58;
    let b = 10;
    console.log(a + b);
36. 36.⚡ What number does this code print?
    let apples = 26;
    apples = apples + 6;
    apples = apples - 17;
    console.log(apples);
37. 37.⚡ What number does this code print?
    let score = 10;
    score = score + 20;
    score = score - 15;
    console.log(score);
38. 38.⚡ What number does this code print?
    let marks = 10;
    marks = marks + 5;
    marks = marks - 10;
    console.log(marks);
39. 39.⚡ What number does this code print?
    let runs = 17;
    runs = runs + 3;
    runs = runs - 2;
    console.log(runs);
40. 40.⚡ 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

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