JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 682 · 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 does this code show?
   let name = "Kabir";
   alert("Hi, " + name + "!"); (a) Hi, Kabir! (b) name (c) Hi, name! (d) Kabir
2. 2.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .js (d) .css
3. 3.⚡ Where does console.log() show its output? (a) on the title bar (b) in the address bar (c) in the console (d) on the printer
4. 4.⚡ What number does this code print?
   let marks = 21;
   marks = marks + 20;
   marks = marks - 16;
   console.log(marks);
5. 5.⚡ Which JavaScript word repeats code? (a) if (b) for (c) console.log() (d) alert()
6. 6.⚡ Which JavaScript word shows a pop-up box? (a) for (b) console.log() (c) alert() (d) let
7. 7.⚡ What does this code show?
   let name = "Arjun";
   alert("Well done, " + name + "!"); (a) Well done, Arjun! (b) Well done, name! (c) name (d) Arjun
8. 8.⚡ What number does this code print?
   let apples = 18;
   apples = apples + 12;
   apples = apples - 1;
   console.log(apples);
9. 9.⚡ What does this code show?
   let name = "Meera";
   alert("Hello, " + name + "!"); (a) Meera (b) name (c) Hello, name! (d) Hello, Meera!
10. 10.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Zoya! (d) Zoya
11. 11.⚡ What number does this code print?
    let a = 5;
    let b = 3;
    console.log(a * b);
12. 12.⚡ Which JavaScript word writes in the console? (a) console.log() (b) for (c) alert() (d) let
13. 13.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Arjun! (d) Arjun
14. 14.⚡ Which word makes a new variable? (a) give (b) put (c) make (d) let
15. 15.⚡ What number does this code print?
    let apples = 13;
    apples = apples + 19;
    apples = apples - 5;
    console.log(apples);
16. 16.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) name (b) Aman (c) Well done, Aman! (d) Well done, name!
17. 17.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Kabir (c) Well done, Kabir! (d) name
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 9;
    console.log(x + y); (a) 59 (b) Error (c) 14
19. 19.⚡ What does alert() show? (a) a new tab (b) a pop-up box (c) a table (d) a picture
20. 20.⚡ Which JavaScript word runs code when true? (a) alert() (b) console.log() (c) for (d) if
21. 21.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Well done, Aman! (b) name (c) Aman (d) Well done, name!
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 8;
    console.log(x + y); (a) 10 (b) 28 (c) Error
23. 23.⚡ Which JavaScript word makes a new variable? (a) alert() (b) let (c) console.log() (d) if
24. 24.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) only colours (d) the domain name
25. 25.⚡ What number does this code print?
    let coins = 13;
    coins = coins + 19;
    coins = coins - 2;
    console.log(coins);
26. 26.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <script> (d) <style>
27. 27.⚡ What number does this code print?
    let a = 45;
    let b = 11;
    console.log(a - b);
28. 28.⚡ What number does this code print?
    let score = 8;
    score = score + 10;
    score = score - 5;
    console.log(score);
29. 29.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Hello, Zoya! (b) Zoya (c) name (d) Hello, name!
30. 30.⚡ What number does this code print?
    let a = 37;
    let b = 38;
    console.log(a + b);
31. 31.⚡ 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
32. 32.⚡ What number does this code print?
    let books = 20;
    books = books + 11;
    books = books - 9;
    console.log(books);
33. 33.⚡ What number does this code print?
    let books = 16;
    books = books + 17;
    books = books - 2;
    console.log(books);
34. 34.⚡ What number does this code print?
    let apples = 13;
    apples = apples + 5;
    apples = apples - 15;
    console.log(apples);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 7;
    console.log(x + y); (a) Error (b) 10 (c) 37
36. 36.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) name (b) Hello, Riya! (c) Riya (d) Hello, name!
37. 37.⚡ What number does this code print?
    let a = 27;
    let b = 21;
    console.log(a - b);
38. 38.⚡ What number does this code print?
    let apples = 10;
    apples = apples + 18;
    apples = apples - 15;
    console.log(apples);
39. 39.⚡ What number does this code print?
    let a = 17;
    let b = 37;
    console.log(a + b);
40. 40.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Hello, Zoya! (b) name (c) Hello, name! (d) Zoya

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