JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 657 · 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) <code> (d) <script>
2. 2.⚡ What number does this code print?
   let score = 17;
   score = score + 5;
   score = score - 19;
   console.log(score);
3. 3.⚡ What number does this code print?
   let a = 59;
   let b = 5;
   console.log(a + b);
4. 4.⚡ What number does this code print?
   let a = 4;
   let b = 2;
   console.log(a * b);
5. 5.⚡ Which JavaScript word writes in the console? (a) console.log() (b) alert() (c) let (d) for
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 8;
   console.log(x + y); (a) 10 (b) 28 (c) Error
7. 7.⚡ What number does this code print?
   let marks = 11;
   marks = marks + 8;
   marks = marks - 3;
   console.log(marks);
8. 8.⚡ What does alert() show? (a) a pop-up box (b) a new tab (c) a picture (d) a table
9. 9.⚡ What number does this code print?
   let marks = 15;
   marks = marks + 4;
   marks = marks - 16;
   console.log(marks);
10. 10.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) let (c) if (d) for
11. 11.⚡ What number does this code print?
    let a = 46;
    let b = 35;
    console.log(a + b);
12. 12.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Meera! (c) Meera (d) name
13. 13.⚡ What number does this code print?
    let a = 44;
    let b = 27;
    console.log(a - b);
14. 14.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Kabir (b) Well done, name! (c) Well done, Kabir! (d) name
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 7;
    console.log(x + y); (a) 77 (b) 14 (c) Error
16. 16.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) the page title (d) actions and changes
17. 17.⚡ 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
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y); (a) 11 (b) 83 (c) Error
19. 19.⚡ What number does this code print?
    let a = 32;
    let b = 6;
    console.log(a + b);
20. 20.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Well done, Aman! (b) name (c) Well done, name! (d) Aman
21. 21.⚡ Which JavaScript word makes a new variable? (a) if (b) console.log() (c) let (d) for
22. 22.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Kabir! (d) Kabir
23. 23.⚡ What number does this code print?
    let a = 6;
    let b = 6;
    console.log(a * b);
24. 24.⚡ What number does this code print?
    let a = 12;
    let b = 20;
    console.log(a + b);
25. 25.⚡ Which JavaScript word runs code when true? (a) alert() (b) let (c) if (d) console.log()
26. 26.⚡ Which word makes a new variable? (a) make (b) let (c) put (d) give
27. 27.⚡ What number does this code print?
    let books = 9;
    books = books + 5;
    books = books - 4;
    console.log(books);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) Error (b) 9 (c) 81
29. 29.⚡ 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
30. 30.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Riya! (c) name (d) Riya
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y); (a) Error (b) 10 (c) 91
32. 32.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Aman! (d) Aman
33. 33.⚡ What number does this code print?
    let score = 16;
    score = score + 5;
    score = score - 7;
    console.log(score);
34. 34.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Hi, Aman! (b) Hi, name! (c) Aman (d) name
35. 35.⚡ What number does this code print?
    let a = 11;
    let b = 37;
    console.log(a + b);
36. 36.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) name (b) Riya (c) Well done, name! (d) Well done, Riya!
37. 37.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Meera (b) Hi, Meera! (c) name (d) Hi, name!
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 4;
    console.log(x + y); (a) Error (b) 14 (c) 5
39. 39.⚡ What number does this code print?
    let a = 60;
    let b = 38;
    console.log(a + b);
40. 40.⚡ What number does this code print?
    let a = 7;
    let b = 35;
    console.log(a + b);

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