JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 14 · 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 = "Arjun";
   console.log("Hello, " + name + "!"); (a) Arjun (b) Hello, Arjun! (c) name (d) Hello, name!
2. 2.⚡ What number does this code print?
   let a = 25;
   let b = 21;
   console.log(a - b);
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 4;
   console.log(x + y); (a) 24 (b) 6 (c) Error
4. 4.⚡ Which JavaScript word repeats code? (a) if (b) console.log() (c) for (d) alert()
5. 5.⚡ What number does this code print?
   let score = 18;
   score = score + 2;
   score = score - 12;
   console.log(score);
6. 6.⚡ What number does this code print?
   let a = 13;
   let b = 17;
   console.log(a + b);
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 5;
   console.log(x + y); (a) 8 (b) Error (c) 35
8. 8.⚡ What number does this code print?
   let a = 8;
   let b = 1;
   console.log(a - b);
9. 9.⚡ What does this code show?
   let name = "Meera";
   alert("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Well done, Meera! (d) Meera
10. 10.⚡ Which JavaScript word runs code when true? (a) let (b) for (c) if (d) console.log()
11. 11.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) for (c) if (d) let
12. 12.⚡ Which JavaScript word shows a pop-up box? (a) for (b) let (c) alert() (d) console.log()
13. 13.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Zoya! (d) Zoya
14. 14.⚡ Which word makes a new variable? (a) give (b) put (c) let (d) make
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) 43 (b) Error (c) 7
16. 16.⚡ What does JavaScript add to a web page? (a) only colours (b) actions and changes (c) the domain name (d) the page title
17. 17.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Meera! (d) Meera
18. 18.⚡ What number does this code print?
    let a = 53;
    let b = 34;
    console.log(a + b);
19. 19.⚡ What does alert() show? (a) a table (b) a picture (c) a new tab (d) a pop-up box
20. 20.⚡ What number does this code print?
    let marks = 23;
    marks = marks + 2;
    marks = marks - 24;
    console.log(marks);
21. 21.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Arjun! (c) Arjun (d) name
22. 22.⚡ Which JavaScript word writes in the console? (a) for (b) alert() (c) let (d) console.log()
23. 23.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) name (b) Hello, Meera! (c) Meera (d) Hello, name!
24. 24.⚡ What number does this code print?
    let a = 26;
    let b = 13;
    console.log(a - b);
25. 25.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Kabir (b) name (c) Well done, name! (d) Well done, Kabir!
26. 26.⚡ What number does this code print?
    let a = 10;
    let b = 11;
    console.log(a * b);
27. 27.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) name (b) Kabir (c) Hello, Kabir! (d) Hello, name!
28. 28.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Kabir (c) name (d) Well done, Kabir!
29. 29.⚡ What number does this code print?
    let books = 11;
    books = books + 10;
    books = books - 16;
    console.log(books);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 5;
    console.log(x + y); (a) 6 (b) Error (c) 15
31. 31.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .css (c) .jpg (d) .html
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 9;
    console.log(x + y); (a) 16 (b) Error (c) 79
33. 33.⚡ What number does this code print?
    let coins = 27;
    coins = coins + 6;
    coins = coins - 24;
    console.log(coins);
34. 34.⚡ What number does this code print?
    let a = 2;
    let b = 12;
    console.log(a * b);
35. 35.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <code> (d) <style>
36. 36.⚡ What number does this code print?
    let runs = 16;
    runs = runs + 3;
    runs = runs - 18;
    console.log(runs);
37. 37.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Aman (b) name (c) Hi, name! (d) Hi, Aman!
38. 38.⚡ 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
39. 39.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Well done, Riya! (b) Riya (c) Well done, name! (d) name
40. 40.⚡ What number does this code print?
    let runs = 17;
    runs = runs + 4;
    runs = runs - 8;
    console.log(runs);

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