JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 738 · 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 = 9;
   let b = 29;
   console.log(a + b);
2. 2.⚡ Which word makes a new variable? (a) give (b) make (c) put (d) let
3. 3.⚡ Which JavaScript word repeats code? (a) alert() (b) for (c) let (d) if
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 8;
   console.log(x + y); (a) 11 (b) Error (c) 38
5. 5.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) only colours (d) the domain name
6. 6.⚡ Which JavaScript word writes in the console? (a) alert() (b) console.log() (c) for (d) let
7. 7.⚡ What number does this code print?
   let score = 11;
   score = score + 11;
   score = score - 4;
   console.log(score);
8. 8.⚡ Which JavaScript word runs code when true? (a) for (b) console.log() (c) if (d) let
9. 9.⚡ What number does this code print?
   let marks = 24;
   marks = marks + 14;
   marks = marks - 27;
   console.log(marks);
10. 10.⚡ Which JavaScript word makes a new variable? (a) let (b) alert() (c) if (d) console.log()
11. 11.⚡ What number does this code print?
    let a = 31;
    let b = 6;
    console.log(a - b);
12. 12.⚡ What number does this code print?
    let apples = 9;
    apples = apples + 18;
    apples = apples - 24;
    console.log(apples);
13. 13.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Arjun (b) name (c) Welcome, Arjun! (d) Welcome, name!
14. 14.⚡ What number does this code print?
    let marks = 15;
    marks = marks + 11;
    marks = marks - 15;
    console.log(marks);
15. 15.⚡ What number does this code print?
    let score = 23;
    score = score + 7;
    score = score - 3;
    console.log(score);
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) Error (b) 2 (c) 11
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 8;
    console.log(x + y); (a) Error (b) 17 (c) 98
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 8;
    console.log(x + y); (a) Error (b) 14 (c) 68
19. 19.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Zoya! (c) name (d) Zoya
20. 20.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Riya! (c) name (d) Riya
21. 21.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) for (c) if (d) console.log()
22. 22.⚡ What number does this code print?
    let a = 2;
    let b = 3;
    console.log(a * b);
23. 23.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <style> (d) <script>
24. 24.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Well done, Kabir! (d) Kabir
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) Error (b) 72 (c) 9
26. 26.⚡ What number does this code print?
    let apples = 18;
    apples = apples + 16;
    apples = apples - 5;
    console.log(apples);
27. 27.⚡ What number does this code print?
    let a = 51;
    let b = 5;
    console.log(a - b);
28. 28.⚡ What number does this code print?
    let a = 60;
    let b = 40;
    console.log(a - b);
29. 29.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, Riya! (b) Welcome, name! (c) name (d) Riya
30. 30.⚡ What number does this code print?
    let books = 5;
    books = books + 2;
    books = books - 4;
    console.log(books);
31. 31.⚡ What number does this code print?
    let a = 28;
    let b = 12;
    console.log(a + b);
32. 32.⚡ What number does this code print?
    let a = 54;
    let b = 20;
    console.log(a + b);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y); (a) Error (b) 7 (c) 52
34. 34.⚡ What number does this code print?
    let score = 5;
    score = score + 13;
    score = score - 17;
    console.log(score);
35. 35.⚡ What does alert() show? (a) a picture (b) a new tab (c) a pop-up box (d) a table
36. 36.⚡ What number does this code print?
    let score = 14;
    score = score + 4;
    score = score - 9;
    console.log(score);
37. 37.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Zoya (c) name (d) Hi, Zoya!
38. 38.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the address bar (d) in the console
39. 39.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Aman! (c) name (d) Aman
40. 40.⚡ What number does this code print?
    let books = 18;
    books = books + 10;
    books = books - 8;
    console.log(books);

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