JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 81 · 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 JavaScript word writes in the console? (a) let (b) console.log() (c) alert() (d) for
2. 2.⚡ What number does this code print?
   let a = 24;
   let b = 4;
   console.log(a + b);
3. 3.⚡ Which JavaScript word repeats code? (a) console.log() (b) for (c) alert() (d) let
4. 4.⚡ What number does this code print?
   let a = 12;
   let b = 6;
   console.log(a * b);
5. 5.⚡ What number does this code print?
   let a = 33;
   let b = 11;
   console.log(a - b);
6. 6.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .js (d) .jpg
7. 7.⚡ Which word makes a new variable? (a) give (b) make (c) put (d) let
8. 8.⚡ Which JavaScript word makes a new variable? (a) for (b) alert() (c) console.log() (d) let
9. 9.⚡ Which JavaScript word runs code when true? (a) for (b) console.log() (c) let (d) if
10. 10.⚡ What number does this code print?
    let a = 50;
    let b = 39;
    console.log(a + b);
11. 11.⚡ What number does this code print?
    let a = 55;
    let b = 3;
    console.log(a + b);
12. 12.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Kabir (b) name (c) Welcome, Kabir! (d) Welcome, name!
13. 13.⚡ What number does this code print?
    let a = 60;
    let b = 34;
    console.log(a + b);
14. 14.⚡ What number does this code print?
    let a = 56;
    let b = 17;
    console.log(a + b);
15. 15.⚡ What number does this code print?
    let a = 59;
    let b = 12;
    console.log(a + b);
16. 16.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Hi, Meera! (b) name (c) Hi, name! (d) Meera
17. 17.⚡ What number does this code print?
    let marks = 9;
    marks = marks + 12;
    marks = marks - 11;
    console.log(marks);
18. 18.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) Zoya (b) Well done, name! (c) Well done, Zoya! (d) name
19. 19.⚡ What does alert() show? (a) a pop-up box (b) a new tab (c) a picture (d) a table
20. 20.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) for (c) if (d) alert()
21. 21.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Well done, Kabir! (b) name (c) Kabir (d) Well done, name!
22. 22.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) only colours (d) the page title
23. 23.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Arjun (b) Well done, name! (c) Well done, Arjun! (d) name
24. 24.⚡ What number does this code print?
    let runs = 17;
    runs = runs + 5;
    runs = runs - 1;
    console.log(runs);
25. 25.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Meera (b) name (c) Hi, Meera! (d) Hi, name!
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 9;
    console.log(x + y); (a) Error (b) 13 (c) 49
27. 27.⚡ What number does this code print?
    let score = 27;
    score = score + 17;
    score = score - 12;
    console.log(score);
28. 28.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Hello, Aman! (d) Aman
29. 29.⚡ What number does this code print?
    let a = 58;
    let b = 2;
    console.log(a + b);
30. 30.⚡ What number does this code print?
    let books = 6;
    books = books + 15;
    books = books - 10;
    console.log(books);
31. 31.⚡ 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
32. 32.⚡ What number does this code print?
    let runs = 16;
    runs = runs + 17;
    runs = runs - 30;
    console.log(runs);
33. 33.⚡ What number does this code print?
    let apples = 10;
    apples = apples + 10;
    apples = apples - 2;
    console.log(apples);
34. 34.⚡ What number does this code print?
    let a = 31;
    let b = 12;
    console.log(a - b);
35. 35.⚡ What number does this code print?
    let marks = 28;
    marks = marks + 7;
    marks = marks - 4;
    console.log(marks);
36. 36.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <style> (d) <script>
37. 37.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Hi, Aman! (b) Hi, name! (c) Aman (d) name
38. 38.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) name (b) Riya (c) Welcome, name! (d) Welcome, Riya!
39. 39.⚡ What number does this code print?
    let score = 22;
    score = score + 14;
    score = score - 11;
    console.log(score);
40. 40.⚡ What number does this code print?
    let a = 40;
    let b = 26;
    console.log(a - b);

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