JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 882 · 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 = 28;
   let b = 8;
   console.log(a + b);
2. 2.⚡ Which JavaScript word shows a pop-up box? (a) for (b) if (c) console.log() (d) alert()
3. 3.⚡ Which JavaScript word writes in the console? (a) alert() (b) console.log() (c) if (d) for
4. 4.⚡ Which word makes a new variable? (a) give (b) make (c) put (d) let
5. 5.⚡ What number does this code print?
   let a = 7;
   let b = 5;
   console.log(a * b);
6. 6.⚡ What number does this code print?
   let books = 8;
   books = books + 20;
   books = books - 12;
   console.log(books);
7. 7.⚡ Which JavaScript word makes a new variable? (a) alert() (b) let (c) console.log() (d) if
8. 8.⚡ What does this code show?
   let name = "Meera";
   console.log("Hi, " + name + "!"); (a) name (b) Hi, Meera! (c) Hi, name! (d) Meera
9. 9.⚡ What number does this code print?
   let a = 8;
   let b = 4;
   console.log(a * b);
10. 10.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, Zoya! (c) Welcome, name! (d) Zoya
11. 11.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) name (b) Zoya (c) Hello, name! (d) Hello, Zoya!
12. 12.⚡ What number does this code print?
    let coins = 22;
    coins = coins + 19;
    coins = coins - 28;
    console.log(coins);
13. 13.⚡ What number does this code print?
    let coins = 5;
    coins = coins + 12;
    coins = coins - 2;
    console.log(coins);
14. 14.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Well done, Meera! (d) Meera
15. 15.⚡ What number does this code print?
    let a = 6;
    let b = 5;
    console.log(a * b);
16. 16.⚡ What number does this code print?
    let score = 28;
    score = score + 5;
    score = score - 29;
    console.log(score);
17. 17.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <code> (d) <script>
18. 18.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the console (d) in the address bar
19. 19.⚡ What number does this code print?
    let marks = 6;
    marks = marks + 18;
    marks = marks - 15;
    console.log(marks);
20. 20.⚡ What number does this code print?
    let a = 4;
    let b = 4;
    console.log(a * b);
21. 21.⚡ What number does this code print?
    let a = 21;
    let b = 17;
    console.log(a - b);
22. 22.⚡ What number does this code print?
    let a = 42;
    let b = 38;
    console.log(a - b);
23. 23.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) only colours (d) actions and changes
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 9;
    console.log(x + y); (a) 99 (b) 18 (c) Error
25. 25.⚡ What number does this code print?
    let books = 13;
    books = books + 9;
    books = books - 4;
    console.log(books);
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 4;
    console.log(x + y); (a) Error (b) 12 (c) 84
27. 27.⚡ What number does this code print?
    let score = 21;
    score = score + 19;
    score = score - 9;
    console.log(score);
28. 28.⚡ What number does this code print?
    let a = 9;
    let b = 6;
    console.log(a * b);
29. 29.⚡ What number does this code print?
    let a = 16;
    let b = 4;
    console.log(a + b);
30. 30.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Riya (c) name (d) Well done, Riya!
31. 31.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Hello, Meera! (b) Hello, name! (c) name (d) Meera
32. 32.⚡ What does alert() show? (a) a new tab (b) a table (c) a pop-up box (d) a picture
33. 33.⚡ What number does this code print?
    let apples = 23;
    apples = apples + 3;
    apples = apples - 1;
    console.log(apples);
34. 34.⚡ What number does this code print?
    let score = 12;
    score = score + 5;
    score = score - 9;
    console.log(score);
35. 35.⚡ What number does this code print?
    let a = 54;
    let b = 27;
    console.log(a + b);
36. 36.⚡ Which JavaScript word repeats code? (a) console.log() (b) for (c) alert() (d) let
37. 37.⚡ Which JavaScript word runs code when true? (a) if (b) for (c) alert() (d) let
38. 38.⚡ What number does this code print?
    let books = 8;
    books = books + 18;
    books = books - 5;
    console.log(books);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) 11 (b) Error (c) 2
40. 40.⚡ What number does this code print?
    let a = 51;
    let b = 27;
    console.log(a - b);

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