JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 38 · 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 a = 37;
   let b = 23;
   console.log(a - b);
2. 2.⚡ Which word makes a new variable? (a) put (b) make (c) let (d) give
3. 3.⚡ What number does this code print?
   let books = 6;
   books = books + 15;
   books = books - 13;
   console.log(books);
4. 4.⚡ What does this code show?
   let name = "Riya";
   console.log("Well done, " + name + "!"); (a) Well done, Riya! (b) Riya (c) name (d) Well done, name!
5. 5.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) for (c) alert() (d) if
6. 6.⚡ Which JavaScript word repeats code? (a) for (b) alert() (c) console.log() (d) if
7. 7.⚡ What does this code show?
   let name = "Zoya";
   alert("Well done, " + name + "!"); (a) Well done, Zoya! (b) Well done, name! (c) Zoya (d) name
8. 8.⚡ What number does this code print?
   let a = 9;
   let b = 10;
   console.log(a * b);
9. 9.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the domain name (c) the page title (d) only colours
10. 10.⚡ Which JavaScript word writes in the console? (a) alert() (b) let (c) if (d) console.log()
11. 11.⚡ What number does this code print?
    let books = 20;
    books = books + 5;
    books = books - 3;
    console.log(books);
12. 12.⚡ What number does this code print?
    let score = 19;
    score = score + 9;
    score = score - 16;
    console.log(score);
13. 13.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .jpg (d) .js
14. 14.⚡ Which JavaScript word runs code when true? (a) alert() (b) if (c) for (d) console.log()
15. 15.⚡ What number does this code print?
    let a = 19;
    let b = 3;
    console.log(a + b);
16. 16.⚡ What number does this code print?
    let score = 29;
    score = score + 12;
    score = score - 18;
    console.log(score);
17. 17.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a new tab (d) a picture
18. 18.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <style> (d) <code>
19. 19.⚡ What number does this code print?
    let a = 51;
    let b = 16;
    console.log(a - b);
20. 20.⚡ What number does this code print?
    let books = 12;
    books = books + 3;
    books = books - 6;
    console.log(books);
21. 21.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Meera! (c) name (d) Meera
22. 22.⚡ What number does this code print?
    let a = 12;
    let b = 35;
    console.log(a + b);
23. 23.⚡ What number does this code print?
    let a = 53;
    let b = 6;
    console.log(a + b);
24. 24.⚡ What number does this code print?
    let runs = 29;
    runs = runs + 9;
    runs = runs - 8;
    console.log(runs);
25. 25.⚡ What number does this code print?
    let marks = 18;
    marks = marks + 20;
    marks = marks - 9;
    console.log(marks);
26. 26.⚡ Which JavaScript word makes a new variable? (a) for (b) console.log() (c) let (d) if
27. 27.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Kabir (c) Welcome, Kabir! (d) name
28. 28.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) in the console (d) on the title bar
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) 35 (b) Error (c) 8
30. 30.⚡ What number does this code print?
    let a = 33;
    let b = 10;
    console.log(a - b);
31. 31.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Well done, Arjun! (b) Well done, name! (c) name (d) Arjun
32. 32.⚡ What number does this code print?
    let a = 21;
    let b = 36;
    console.log(a + b);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 4;
    console.log(x + y); (a) Error (b) 13 (c) 94
34. 34.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) name (b) Hello, Riya! (c) Riya (d) Hello, name!
35. 35.⚡ What number does this code print?
    let marks = 28;
    marks = marks + 6;
    marks = marks - 21;
    console.log(marks);
36. 36.⚡ What number does this code print?
    let marks = 7;
    marks = marks + 20;
    marks = marks - 10;
    console.log(marks);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 4;
    console.log(x + y); (a) Error (b) 6 (c) 24
38. 38.⚡ What number does this code print?
    let a = 3;
    let b = 12;
    console.log(a * b);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) 32 (b) Error (c) 5
40. 40.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) name (b) Aman (c) Hi, name! (d) Hi, Aman!

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