JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 176 · 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 tag holds JavaScript in a page? (a) <js> (b) <style> (c) <script> (d) <code>
2. 2.⚡ What does alert() show? (a) a picture (b) a pop-up box (c) a table (d) a new tab
3. 3.⚡ Which JavaScript word makes a new variable? (a) alert() (b) let (c) console.log() (d) for
4. 4.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the page title (c) only colours (d) the domain name
5. 5.⚡ What does this code show?
   let name = "Arjun";
   alert("Hello, " + name + "!"); (a) Hello, Arjun! (b) Arjun (c) name (d) Hello, name!
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 1;
   console.log(x + y); (a) 3 (b) 21 (c) Error
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 8;
   console.log(x + y); (a) Error (b) 13 (c) 58
8. 8.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) for (c) alert() (d) if
9. 9.⚡ 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
10. 10.⚡ Which JavaScript word writes in the console? (a) console.log() (b) alert() (c) for (d) if
11. 11.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .js (d) .html
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y); (a) 7 (b) 52 (c) Error
13. 13.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Riya (d) Hello, Riya!
14. 14.⚡ What number does this code print?
    let a = 37;
    let b = 24;
    console.log(a - b);
15. 15.⚡ Which word makes a new variable? (a) let (b) put (c) give (d) make
16. 16.⚡ What number does this code print?
    let a = 10;
    let b = 9;
    console.log(a * b);
17. 17.⚡ Which JavaScript word runs code when true? (a) for (b) console.log() (c) let (d) if
18. 18.⚡ What number does this code print?
    let books = 22;
    books = books + 16;
    books = books - 26;
    console.log(books);
19. 19.⚡ What number does this code print?
    let marks = 26;
    marks = marks + 5;
    marks = marks - 13;
    console.log(marks);
20. 20.⚡ What number does this code print?
    let marks = 27;
    marks = marks + 6;
    marks = marks - 24;
    console.log(marks);
21. 21.⚡ What number does this code print?
    let a = 2;
    let b = 11;
    console.log(a * b);
22. 22.⚡ What number does this code print?
    let runs = 6;
    runs = runs + 14;
    runs = runs - 19;
    console.log(runs);
23. 23.⚡ What number does this code print?
    let a = 53;
    let b = 35;
    console.log(a - b);
24. 24.⚡ What number does this code print?
    let coins = 9;
    coins = coins + 14;
    coins = coins - 1;
    console.log(coins);
25. 25.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Aman (c) name (d) Hi, Aman!
26. 26.⚡ What number does this code print?
    let runs = 7;
    runs = runs + 19;
    runs = runs - 8;
    console.log(runs);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 9;
    console.log(x + y); (a) Error (b) 19 (c) 10
28. 28.⚡ What number does this code print?
    let a = 6;
    let b = 6;
    console.log(a + b);
29. 29.⚡ What number does this code print?
    let a = 38;
    let b = 31;
    console.log(a - b);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 8;
    console.log(x + y); (a) 11 (b) Error (c) 38
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) 63 (b) Error (c) 9
32. 32.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Riya (b) Welcome, Riya! (c) Welcome, name! (d) name
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 8;
    console.log(x + y); (a) Error (b) 98 (c) 17
34. 34.⚡ What number does this code print?
    let marks = 27;
    marks = marks + 12;
    marks = marks - 1;
    console.log(marks);
35. 35.⚡ What number does this code print?
    let coins = 6;
    coins = coins + 16;
    coins = coins - 5;
    console.log(coins);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y); (a) 6 (b) Error (c) 51
37. 37.⚡ What number does this code print?
    let a = 58;
    let b = 37;
    console.log(a + b);
38. 38.⚡ What number does this code print?
    let runs = 18;
    runs = runs + 11;
    runs = runs - 27;
    console.log(runs);
39. 39.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Meera (b) Hello, name! (c) name (d) Hello, Meera!
40. 40.⚡ What number does this code print?
    let a = 30;
    let b = 3;
    console.log(a + b);

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