JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 573 · 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 print? (Look at the quotes!)
   let x = "6";
   let y = 3;
   console.log(x + y); (a) Error (b) 9 (c) 63
2. 2.⚡ What does this code show?
   let name = "Aman";
   alert("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Aman! (d) Aman
3. 3.⚡ Which JavaScript word writes in the console? (a) alert() (b) console.log() (c) for (d) if
4. 4.⚡ What does this code show?
   let name = "Arjun";
   console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Arjun (d) Well done, Arjun!
5. 5.⚡ What number does this code print?
   let a = 12;
   let b = 2;
   console.log(a * b);
6. 6.⚡ Which word makes a new variable? (a) give (b) let (c) put (d) make
7. 7.⚡ What does this code show?
   let name = "Riya";
   console.log("Well done, " + name + "!"); (a) Riya (b) Well done, Riya! (c) name (d) Well done, name!
8. 8.⚡ What does alert() show? (a) a new tab (b) a picture (c) a pop-up box (d) a table
9. 9.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) let (c) for (d) alert()
10. 10.⚡ Which JavaScript word repeats code? (a) alert() (b) let (c) if (d) for
11. 11.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the page title (c) only colours (d) the domain name
12. 12.⚡ Which JavaScript word makes a new variable? (a) for (b) let (c) console.log() (d) if
13. 13.⚡ Which JavaScript word runs code when true? (a) for (b) alert() (c) let (d) if
14. 14.⚡ What number does this code print?
    let books = 15;
    books = books + 4;
    books = books - 14;
    console.log(books);
15. 15.⚡ What number does this code print?
    let a = 8;
    let b = 10;
    console.log(a * b);
16. 16.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Aman (b) name (c) Hi, name! (d) Hi, Aman!
17. 17.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Zoya (b) Hi, name! (c) Hi, Zoya! (d) name
18. 18.⚡ What number does this code print?
    let a = 31;
    let b = 10;
    console.log(a - b);
19. 19.⚡ What number does this code print?
    let a = 26;
    let b = 26;
    console.log(a + b);
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 7;
    console.log(x + y); (a) Error (b) 9 (c) 27
21. 21.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .css (c) .html (d) .js
22. 22.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Meera (c) Hi, Meera! (d) name
23. 23.⚡ What number does this code print?
    let apples = 20;
    apples = apples + 7;
    apples = apples - 26;
    console.log(apples);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y); (a) 67 (b) Error (c) 13
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 5;
    console.log(x + y); (a) 55 (b) Error (c) 10
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y); (a) 6 (b) 51 (c) Error
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 7;
    console.log(x + y); (a) Error (b) 15 (c) 87
28. 28.⚡ What number does this code print?
    let a = 52;
    let b = 9;
    console.log(a - b);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 9;
    console.log(x + y); (a) Error (b) 19 (c) 10
30. 30.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Arjun (b) Hi, Arjun! (c) Hi, name! (d) name
31. 31.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <script> (d) <code>
32. 32.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) name (b) Aman (c) Welcome, name! (d) Welcome, Aman!
33. 33.⚡ What number does this code print?
    let apples = 12;
    apples = apples + 3;
    apples = apples - 13;
    console.log(apples);
34. 34.⚡ What number does this code print?
    let a = 5;
    let b = 39;
    console.log(a + b);
35. 35.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Meera (b) Welcome, Meera! (c) name (d) Welcome, name!
36. 36.⚡ What number does this code print?
    let a = 8;
    let b = 8;
    console.log(a * b);
37. 37.⚡ What number does this code print?
    let score = 14;
    score = score + 12;
    score = score - 10;
    console.log(score);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) Error (b) 35 (c) 8
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 9;
    console.log(x + y); (a) 12 (b) 39 (c) Error
40. 40.⚡ What number does this code print?
    let runs = 9;
    runs = runs + 9;
    runs = runs - 10;
    console.log(runs);

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