JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 670 · 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 marks = 25;
   marks = marks + 20;
   marks = marks - 23;
   console.log(marks);
2. 2.⚡ Which JavaScript word repeats code? (a) if (b) alert() (c) console.log() (d) for
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 9;
   console.log(x + y); (a) 15 (b) Error (c) 69
4. 4.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .jpg (c) .css (d) .html
5. 5.⚡ Which JavaScript word makes a new variable? (a) alert() (b) if (c) let (d) console.log()
6. 6.⚡ Which JavaScript word runs code when true? (a) alert() (b) if (c) let (d) for
7. 7.⚡ Which JavaScript word shows a pop-up box? (a) for (b) alert() (c) if (d) console.log()
8. 8.⚡ What number does this code print?
   let apples = 22;
   apples = apples + 10;
   apples = apples - 6;
   console.log(apples);
9. 9.⚡ What does this code show?
   let name = "Arjun";
   alert("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Arjun! (d) Arjun
10. 10.⚡ What number does this code print?
    let marks = 19;
    marks = marks + 14;
    marks = marks - 33;
    console.log(marks);
11. 11.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <style> (d) <script>
12. 12.⚡ What does alert() show? (a) a pop-up box (b) a new tab (c) a picture (d) a table
13. 13.⚡ What number does this code print?
    let a = 5;
    let b = 9;
    console.log(a * b);
14. 14.⚡ What number does this code print?
    let score = 23;
    score = score + 5;
    score = score - 4;
    console.log(score);
15. 15.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the address bar (d) in the console
16. 16.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Well done, Arjun! (d) Arjun
17. 17.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Riya (b) Well done, name! (c) name (d) Well done, Riya!
18. 18.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Aman (b) name (c) Well done, name! (d) Well done, Aman!
19. 19.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Aman! (c) name (d) Aman
20. 20.⚡ What number does this code print?
    let score = 12;
    score = score + 6;
    score = score - 15;
    console.log(score);
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) 7 (b) 43 (c) Error
22. 22.⚡ What number does this code print?
    let books = 7;
    books = books + 6;
    books = books - 12;
    console.log(books);
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 7;
    console.log(x + y); (a) Error (b) 87 (c) 15
24. 24.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) name (b) Arjun (c) Hello, Arjun! (d) Hello, name!
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) Error (b) 3 (c) 21
26. 26.⚡ What number does this code print?
    let runs = 5;
    runs = runs + 20;
    runs = runs - 9;
    console.log(runs);
27. 27.⚡ What does JavaScript add to a web page? (a) the page title (b) only colours (c) actions and changes (d) the domain name
28. 28.⚡ Which word makes a new variable? (a) let (b) put (c) make (d) give
29. 29.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, Riya! (b) Riya (c) name (d) Welcome, name!
30. 30.⚡ What number does this code print?
    let a = 46;
    let b = 26;
    console.log(a + b);
31. 31.⚡ Which JavaScript word writes in the console? (a) alert() (b) console.log() (c) if (d) let
32. 32.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Kabir (b) Welcome, name! (c) name (d) Welcome, Kabir!
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 4;
    console.log(x + y); (a) 9 (b) 54 (c) Error
34. 34.⚡ 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
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) Error (b) 9 (c) 63
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y); (a) 67 (b) 13 (c) Error
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y); (a) 8 (b) Error (c) 44
38. 38.⚡ What number does this code print?
    let a = 11;
    let b = 9;
    console.log(a * b);
39. 39.⚡ What number does this code print?
    let runs = 28;
    runs = runs + 8;
    runs = runs - 17;
    console.log(runs);
40. 40.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, Riya! (b) Well done, name! (c) name (d) Riya

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