JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 15 · 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) Well done, Aman! (b) Well done, name! (c) name (d) Aman
2. 2.⚡ Which JavaScript word runs code when true? (a) console.log() (b) if (c) for (d) let
3. 3.⚡ What does this code show?
   let name = "Meera";
   console.log("Hello, " + name + "!"); (a) Meera (b) name (c) Hello, Meera! (d) Hello, name!
4. 4.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <script> (c) <code> (d) <js>
5. 5.⚡ What does this code show?
   let name = "Meera";
   alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Meera! (d) Meera
6. 6.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .css (d) .jpg
7. 7.⚡ Which JavaScript word writes in the console? (a) if (b) for (c) console.log() (d) let
8. 8.⚡ What number does this code print?
   let a = 58;
   let b = 7;
   console.log(a + b);
9. 9.⚡ Which word makes a new variable? (a) let (b) make (c) put (d) give
10. 10.⚡ What number does this code print?
    let books = 16;
    books = books + 19;
    books = books - 3;
    console.log(books);
11. 11.⚡ What number does this code print?
    let a = 2;
    let b = 12;
    console.log(a * b);
12. 12.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) alert() (c) if (d) let
13. 13.⚡ What number does this code print?
    let score = 9;
    score = score + 17;
    score = score - 1;
    console.log(score);
14. 14.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Aman (c) name (d) Hi, Aman!
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 5;
    console.log(x + y); (a) Error (b) 13 (c) 85
16. 16.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Riya! (c) Riya (d) Welcome, name!
17. 17.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) for (c) let (d) console.log()
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 8;
    console.log(x + y); (a) 88 (b) 16 (c) Error
19. 19.⚡ Which JavaScript word repeats code? (a) for (b) console.log() (c) if (d) let
20. 20.⚡ What number does this code print?
    let apples = 17;
    apples = apples + 7;
    apples = apples - 5;
    console.log(apples);
21. 21.⚡ What number does this code print?
    let a = 2;
    let b = 8;
    console.log(a * b);
22. 22.⚡ What number does this code print?
    let a = 35;
    let b = 32;
    console.log(a - b);
23. 23.⚡ 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
24. 24.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) on the title bar (d) in the console
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y); (a) 8 (b) 62 (c) Error
26. 26.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) Meera (b) name (c) Well done, Meera! (d) Well done, name!
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y); (a) Error (b) 9 (c) 18
28. 28.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) only colours (d) actions and changes
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 9;
    console.log(x + y); (a) 99 (b) Error (c) 18
30. 30.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Meera (b) Welcome, name! (c) name (d) Welcome, Meera!
31. 31.⚡ What number does this code print?
    let a = 33;
    let b = 32;
    console.log(a - b);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 5;
    console.log(x + y); (a) Error (b) 55 (c) 10
33. 33.⚡ What number does this code print?
    let coins = 7;
    coins = coins + 20;
    coins = coins - 3;
    console.log(coins);
34. 34.⚡ What number does this code print?
    let apples = 10;
    apples = apples + 9;
    apples = apples - 19;
    console.log(apples);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y); (a) 22 (b) Error (c) 4
36. 36.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Zoya (b) Well done, name! (c) name (d) Well done, Zoya!
37. 37.⚡ What number does this code print?
    let marks = 11;
    marks = marks + 2;
    marks = marks - 10;
    console.log(marks);
38. 38.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Welcome, Aman! (b) Welcome, name! (c) Aman (d) name
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 a = 11;
    let b = 8;
    console.log(a + b);

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