JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 216 · 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 print? (Look at the quotes!)
   let x = "2";
   let y = 1;
   console.log(x + y); (a) 3 (b) Error (c) 21
2. 2.⚡ Which JavaScript word repeats code? (a) alert() (b) if (c) for (d) console.log()
3. 3.⚡ What number does this code print?
   let books = 8;
   books = books + 14;
   books = books - 3;
   console.log(books);
4. 4.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the page title (c) the domain name (d) only colours
5. 5.⚡ What does this code show?
   let name = "Riya";
   alert("Hi, " + name + "!"); (a) Hi, Riya! (b) name (c) Hi, name! (d) Riya
6. 6.⚡ Which JavaScript word shows a pop-up box? (a) if (b) let (c) alert() (d) console.log()
7. 7.⚡ What number does this code print?
   let books = 6;
   books = books + 5;
   books = books - 1;
   console.log(books);
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 2;
   console.log(x + y); (a) Error (b) 3 (c) 12
9. 9.⚡ What number does this code print?
   let a = 6;
   let b = 2;
   console.log(a * b);
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 4;
    console.log(x + y); (a) 64 (b) Error (c) 10
11. 11.⚡ Which JavaScript word runs code when true? (a) alert() (b) let (c) console.log() (d) if
12. 12.⚡ What number does this code print?
    let marks = 17;
    marks = marks + 18;
    marks = marks - 9;
    console.log(marks);
13. 13.⚡ What number does this code print?
    let a = 44;
    let b = 13;
    console.log(a + b);
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 2;
    console.log(x + y); (a) 11 (b) Error (c) 92
15. 15.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, Riya! (b) name (c) Riya (d) Well done, name!
16. 16.⚡ Which word makes a new variable? (a) give (b) put (c) let (d) make
17. 17.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Arjun (b) Well done, Arjun! (c) Well done, name! (d) name
18. 18.⚡ What number does this code print?
    let marks = 10;
    marks = marks + 9;
    marks = marks - 3;
    console.log(marks);
19. 19.⚡ What number does this code print?
    let apples = 19;
    apples = apples + 12;
    apples = apples - 11;
    console.log(apples);
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 5;
    console.log(x + y); (a) Error (b) 95 (c) 14
21. 21.⚡ What number does this code print?
    let runs = 8;
    runs = runs + 11;
    runs = runs - 4;
    console.log(runs);
22. 22.⚡ Which JavaScript word writes in the console? (a) if (b) let (c) for (d) console.log()
23. 23.⚡ Where does console.log() show its output? (a) on the printer (b) in the console (c) on the title bar (d) in the address bar
24. 24.⚡ What does alert() show? (a) a table (b) a picture (c) a new tab (d) a pop-up box
25. 25.⚡ What number does this code print?
    let a = 3;
    let b = 4;
    console.log(a * b);
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 9;
    console.log(x + y); (a) Error (b) 12 (c) 39
27. 27.⚡ What number does this code print?
    let a = 2;
    let b = 11;
    console.log(a * b);
28. 28.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Aman! (d) Aman
29. 29.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Meera (b) name (c) Hi, Meera! (d) Hi, name!
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) 9 (b) Error (c) 72
31. 31.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <js> (d) <script>
32. 32.⚡ What number does this code print?
    let apples = 26;
    apples = apples + 11;
    apples = apples - 9;
    console.log(apples);
33. 33.⚡ What number does this code print?
    let coins = 19;
    coins = coins + 14;
    coins = coins - 15;
    console.log(coins);
34. 34.⚡ What number does this code print?
    let a = 7;
    let b = 8;
    console.log(a * b);
35. 35.⚡ What number does this code print?
    let marks = 5;
    marks = marks + 18;
    marks = marks - 11;
    console.log(marks);
36. 36.⚡ What number does this code print?
    let coins = 6;
    coins = coins + 4;
    coins = coins - 4;
    console.log(coins);
37. 37.⚡ What number does this code print?
    let a = 10;
    let b = 7;
    console.log(a * b);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 8;
    console.log(x + y); (a) Error (b) 88 (c) 16
39. 39.⚡ What number does this code print?
    let apples = 29;
    apples = apples + 10;
    apples = apples - 16;
    console.log(apples);
40. 40.⚡ What number does this code print?
    let marks = 27;
    marks = marks + 9;
    marks = marks - 30;
    console.log(marks);

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