JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 234 · 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 = "Aman";
   console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Aman (d) Hi, Aman!
2. 2.⚡ What does alert() show? (a) a picture (b) a table (c) a new tab (d) a pop-up box
3. 3.⚡ Where does console.log() show its output? (a) in the console (b) on the title bar (c) in the address bar (d) on the printer
4. 4.⚡ Which JavaScript word repeats code? (a) let (b) console.log() (c) for (d) alert()
5. 5.⚡ What does this code show?
   let name = "Meera";
   console.log("Hi, " + name + "!"); (a) Meera (b) Hi, Meera! (c) name (d) Hi, name!
6. 6.⚡ What does this code show?
   let name = "Kabir";
   alert("Well done, " + name + "!"); (a) Well done, Kabir! (b) Kabir (c) Well done, name! (d) name
7. 7.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .js (d) .css
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 1;
   console.log(x + y); (a) Error (b) 4 (c) 31
9. 9.⚡ What number does this code print?
   let apples = 15;
   apples = apples + 16;
   apples = apples - 1;
   console.log(apples);
10. 10.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Zoya! (d) Zoya
11. 11.⚡ Which JavaScript word runs code when true? (a) if (b) alert() (c) for (d) let
12. 12.⚡ Which JavaScript word makes a new variable? (a) if (b) for (c) console.log() (d) let
13. 13.⚡ What number does this code print?
    let a = 47;
    let b = 11;
    console.log(a - b);
14. 14.⚡ What number does this code print?
    let runs = 5;
    runs = runs + 3;
    runs = runs - 8;
    console.log(runs);
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y); (a) Error (b) 4 (c) 22
16. 16.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) actions and changes (d) the page title
17. 17.⚡ Which JavaScript word writes in the console? (a) for (b) console.log() (c) if (d) alert()
18. 18.⚡ What number does this code print?
    let coins = 28;
    coins = coins + 14;
    coins = coins - 41;
    console.log(coins);
19. 19.⚡ What number does this code print?
    let a = 27;
    let b = 3;
    console.log(a + b);
20. 20.⚡ What number does this code print?
    let a = 30;
    let b = 10;
    console.log(a + b);
21. 21.⚡ Which JavaScript word shows a pop-up box? (a) if (b) let (c) console.log() (d) alert()
22. 22.⚡ What number does this code print?
    let a = 20;
    let b = 13;
    console.log(a - b);
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 3;
    console.log(x + y); (a) Error (b) 53 (c) 8
24. 24.⚡ What number does this code print?
    let a = 6;
    let b = 11;
    console.log(a * b);
25. 25.⚡ What number does this code print?
    let marks = 11;
    marks = marks + 8;
    marks = marks - 4;
    console.log(marks);
26. 26.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) name (b) Arjun (c) Hi, name! (d) Hi, Arjun!
27. 27.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <script> (d) <code>
28. 28.⚡ What number does this code print?
    let books = 9;
    books = books + 5;
    books = books - 3;
    console.log(books);
29. 29.⚡ What number does this code print?
    let a = 7;
    let b = 8;
    console.log(a * b);
30. 30.⚡ What number does this code print?
    let a = 21;
    let b = 10;
    console.log(a - b);
31. 31.⚡ What number does this code print?
    let a = 15;
    let b = 16;
    console.log(a + b);
32. 32.⚡ What number does this code print?
    let a = 11;
    let b = 13;
    console.log(a + b);
33. 33.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Welcome, Meera! (b) Meera (c) Welcome, name! (d) name
34. 34.⚡ What number does this code print?
    let score = 8;
    score = score + 20;
    score = score - 19;
    console.log(score);
35. 35.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) name (b) Aman (c) Welcome, Aman! (d) Welcome, name!
36. 36.⚡ What number does this code print?
    let a = 30;
    let b = 29;
    console.log(a - b);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 8;
    console.log(x + y); (a) 13 (b) 58 (c) Error
38. 38.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, Kabir! (c) Hi, name! (d) Kabir
39. 39.⚡ What number does this code print?
    let a = 23;
    let b = 7;
    console.log(a - b);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 4;
    console.log(x + y); (a) 5 (b) Error (c) 14

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