JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 370 · 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) <script> (c) <code> (d) <style>
2. 2.⚡ What number does this code print?
   let a = 12;
   let b = 9;
   console.log(a * b);
3. 3.⚡ What number does this code print?
   let coins = 7;
   coins = coins + 7;
   coins = coins - 6;
   console.log(coins);
4. 4.⚡ Which JavaScript word makes a new variable? (a) let (b) console.log() (c) for (d) if
5. 5.⚡ What number does this code print?
   let books = 7;
   books = books + 17;
   books = books - 18;
   console.log(books);
6. 6.⚡ Which JavaScript word repeats code? (a) console.log() (b) if (c) alert() (d) for
7. 7.⚡ What number does this code print?
   let coins = 17;
   coins = coins + 3;
   coins = coins - 17;
   console.log(coins);
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 1;
   console.log(x + y); (a) 81 (b) 9 (c) Error
9. 9.⚡ What number does this code print?
   let a = 2;
   let b = 7;
   console.log(a * b);
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) 4 (b) 13 (c) Error
11. 11.⚡ What number does this code print?
    let books = 10;
    books = books + 20;
    books = books - 14;
    console.log(books);
12. 12.⚡ What number does this code print?
    let books = 23;
    books = books + 7;
    books = books - 19;
    console.log(books);
13. 13.⚡ Which JavaScript word writes in the console? (a) if (b) alert() (c) let (d) console.log()
14. 14.⚡ What number does this code print?
    let a = 49;
    let b = 31;
    console.log(a + b);
15. 15.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Aman! (c) Aman (d) name
16. 16.⚡ What number does this code print?
    let a = 20;
    let b = 24;
    console.log(a + b);
17. 17.⚡ What number does this code print?
    let a = 4;
    let b = 7;
    console.log(a * b);
18. 18.⚡ What number does this code print?
    let a = 49;
    let b = 27;
    console.log(a + b);
19. 19.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Riya (b) Welcome, name! (c) name (d) Welcome, Riya!
20. 20.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Zoya! (d) Zoya
21. 21.⚡ Which word makes a new variable? (a) give (b) let (c) make (d) put
22. 22.⚡ Where does console.log() show its output? (a) in the address bar (b) on the printer (c) on the title bar (d) in the console
23. 23.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Riya (b) name (c) Hello, name! (d) Hello, Riya!
24. 24.⚡ Which JavaScript word shows a pop-up box? (a) let (b) console.log() (c) alert() (d) for
25. 25.⚡ Which JavaScript word runs code when true? (a) alert() (b) let (c) if (d) console.log()
26. 26.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Well done, Kabir! (b) Kabir (c) name (d) Well done, name!
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 1;
    console.log(x + y); (a) Error (b) 8 (c) 71
28. 28.⚡ What number does this code print?
    let marks = 10;
    marks = marks + 19;
    marks = marks - 8;
    console.log(marks);
29. 29.⚡ What number does this code print?
    let marks = 27;
    marks = marks + 19;
    marks = marks - 17;
    console.log(marks);
30. 30.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Welcome, Kabir! (b) Welcome, name! (c) name (d) Kabir
31. 31.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .jpg (d) .css
32. 32.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Meera! (d) Meera
33. 33.⚡ What number does this code print?
    let apples = 11;
    apples = apples + 11;
    apples = apples - 1;
    console.log(apples);
34. 34.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Hello, Aman! (b) Aman (c) Hello, name! (d) name
35. 35.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) the page title (d) actions and changes
36. 36.⚡ What number does this code print?
    let marks = 17;
    marks = marks + 5;
    marks = marks - 16;
    console.log(marks);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 4;
    console.log(x + y); (a) Error (b) 34 (c) 7
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 7;
    console.log(x + y); (a) Error (b) 12 (c) 57
39. 39.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Hello, Meera! (b) name (c) Meera (d) Hello, name!
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y); (a) Error (b) 13 (c) 67

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