JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 776 · 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 runs code when true? (a) alert() (b) console.log() (c) let (d) if
2. 2.⚡ What does this code show?
   let name = "Kabir";
   console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Kabir! (c) Welcome, name! (d) Kabir
3. 3.⚡ What number does this code print?
   let coins = 11;
   coins = coins + 5;
   coins = coins - 8;
   console.log(coins);
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 2;
   console.log(x + y); (a) 3 (b) 12 (c) Error
5. 5.⚡ What does this code show?
   let name = "Kabir";
   alert("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Hello, Kabir! (d) Kabir
6. 6.⚡ Which word makes a new variable? (a) give (b) make (c) let (d) put
7. 7.⚡ What number does this code print?
   let a = 2;
   let b = 10;
   console.log(a * b);
8. 8.⚡ Which JavaScript word shows a pop-up box? (a) let (b) if (c) for (d) alert()
9. 9.⚡ What does this code show?
   let name = "Meera";
   alert("Hello, " + name + "!"); (a) Hello, Meera! (b) name (c) Hello, name! (d) Meera
10. 10.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) let (c) for (d) if
11. 11.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the address bar (d) in the console
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 4;
    console.log(x + y); (a) 64 (b) Error (c) 10
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y); (a) Error (b) 10 (c) 91
14. 14.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .css (d) .js
15. 15.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Aman (b) Hi, name! (c) Hi, Aman! (d) name
16. 16.⚡ What number does this code print?
    let a = 41;
    let b = 7;
    console.log(a - b);
17. 17.⚡ What does JavaScript add to a web page? (a) only colours (b) actions and changes (c) the domain name (d) the page title
18. 18.⚡ What number does this code print?
    let a = 16;
    let b = 28;
    console.log(a + b);
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 8;
    console.log(x + y); (a) Error (b) 28 (c) 10
20. 20.⚡ What number does this code print?
    let score = 25;
    score = score + 11;
    score = score - 6;
    console.log(score);
21. 21.⚡ What number does this code print?
    let coins = 30;
    coins = coins + 19;
    coins = coins - 33;
    console.log(coins);
22. 22.⚡ What number does this code print?
    let marks = 27;
    marks = marks + 5;
    marks = marks - 7;
    console.log(marks);
23. 23.⚡ What number does this code print?
    let a = 11;
    let b = 2;
    console.log(a + b);
24. 24.⚡ What number does this code print?
    let a = 8;
    let b = 28;
    console.log(a + b);
25. 25.⚡ What number does this code print?
    let books = 30;
    books = books + 2;
    books = books - 5;
    console.log(books);
26. 26.⚡ Which JavaScript word repeats code? (a) alert() (b) console.log() (c) let (d) for
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 1;
    console.log(x + y); (a) Error (b) 7 (c) 61
28. 28.⚡ What number does this code print?
    let books = 25;
    books = books + 10;
    books = books - 15;
    console.log(books);
29. 29.⚡ What number does this code print?
    let marks = 26;
    marks = marks + 15;
    marks = marks - 24;
    console.log(marks);
30. 30.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Zoya (c) name (d) Hello, Zoya!
31. 31.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <code> (d) <script>
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 3;
    console.log(x + y); (a) Error (b) 73 (c) 10
33. 33.⚡ What number does this code print?
    let apples = 30;
    apples = apples + 19;
    apples = apples - 15;
    console.log(apples);
34. 34.⚡ What number does this code print?
    let a = 10;
    let b = 21;
    console.log(a + b);
35. 35.⚡ What number does this code print?
    let a = 59;
    let b = 9;
    console.log(a + b);
36. 36.⚡ What number does this code print?
    let a = 4;
    let b = 12;
    console.log(a * b);
37. 37.⚡ What does alert() show? (a) a pop-up box (b) a table (c) a picture (d) a new tab
38. 38.⚡ What number does this code print?
    let books = 19;
    books = books + 6;
    books = books - 23;
    console.log(books);
39. 39.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Kabir! (c) name (d) Kabir
40. 40.⚡ 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

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