JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 605 · 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("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Aman (d) Well done, Aman!
2. 2.⚡ What does this code show?
   let name = "Riya";
   alert("Well done, " + name + "!"); (a) Well done, Riya! (b) Well done, name! (c) Riya (d) name
3. 3.⚡ What does this code show?
   let name = "Aman";
   console.log("Hello, " + name + "!"); (a) Aman (b) Hello, name! (c) name (d) Hello, Aman!
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 6;
   console.log(x + y); (a) Error (b) 26 (c) 8
5. 5.⚡ What number does this code print?
   let books = 12;
   books = books + 4;
   books = books - 15;
   console.log(books);
6. 6.⚡ What does this code show?
   let name = "Zoya";
   alert("Well done, " + name + "!"); (a) Well done, Zoya! (b) name (c) Zoya (d) Well done, name!
7. 7.⚡ What does JavaScript add to a web page? (a) the page title (b) only colours (c) the domain name (d) actions and changes
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 2;
   console.log(x + y); (a) 5 (b) Error (c) 32
9. 9.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) for (c) let (d) alert()
10. 10.⚡ What number does this code print?
    let a = 52;
    let b = 24;
    console.log(a - b);
11. 11.⚡ What number does this code print?
    let a = 10;
    let b = 9;
    console.log(a - b);
12. 12.⚡ Which JavaScript word shows a pop-up box? (a) let (b) if (c) console.log() (d) alert()
13. 13.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Well done, Aman! (b) Well done, name! (c) Aman (d) name
14. 14.⚡ 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
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y); (a) Error (b) 46 (c) 10
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 4;
    console.log(x + y); (a) Error (b) 9 (c) 54
17. 17.⚡ What number does this code print?
    let a = 23;
    let b = 25;
    console.log(a + b);
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) 3 (b) Error (c) 12
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) Error (b) 9 (c) 81
20. 20.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Well done, Riya! (d) Riya
21. 21.⚡ Which JavaScript word repeats code? (a) for (b) console.log() (c) let (d) alert()
22. 22.⚡ Which JavaScript word writes in the console? (a) if (b) let (c) console.log() (d) for
23. 23.⚡ What number does this code print?
    let a = 54;
    let b = 24;
    console.log(a - b);
24. 24.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) name (b) Zoya (c) Hi, name! (d) Hi, Zoya!
25. 25.⚡ What number does this code print?
    let score = 12;
    score = score + 9;
    score = score - 15;
    console.log(score);
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 5;
    console.log(x + y); (a) Error (b) 6 (c) 15
27. 27.⚡ What number does this code print?
    let a = 4;
    let b = 6;
    console.log(a * b);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y); (a) Error (b) 18 (c) 9
29. 29.⚡ Which JavaScript word runs code when true? (a) console.log() (b) alert() (c) for (d) if
30. 30.⚡ What number does this code print?
    let a = 18;
    let b = 7;
    console.log(a - b);
31. 31.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Hello, Meera! (b) name (c) Meera (d) Hello, name!
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) 9 (b) Error (c) 72
33. 33.⚡ What number does this code print?
    let a = 6;
    let b = 1;
    console.log(a + b);
34. 34.⚡ Where does console.log() show its output? (a) in the address bar (b) on the title bar (c) in the console (d) on the printer
35. 35.⚡ What number does this code print?
    let apples = 6;
    apples = apples + 19;
    apples = apples - 8;
    console.log(apples);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) 11 (b) 2 (c) Error
37. 37.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <style> (d) <script>
38. 38.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, Riya! (c) Hello, name! (d) Riya
39. 39.⚡ What number does this code print?
    let a = 7;
    let b = 12;
    console.log(a * b);
40. 40.⚡ What number does this code print?
    let books = 23;
    books = books + 4;
    books = books - 26;
    console.log(books);

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