JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 148 · 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 number does this code print?
   let marks = 9;
   marks = marks + 14;
   marks = marks - 10;
   console.log(marks);
2. 2.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) only colours (d) actions and changes
3. 3.⚡ What does this code show?
   let name = "Meera";
   alert("Welcome, " + name + "!"); (a) name (b) Welcome, Meera! (c) Welcome, name! (d) Meera
4. 4.⚡ Which JavaScript word runs code when true? (a) alert() (b) if (c) let (d) console.log()
5. 5.⚡ What number does this code print?
   let a = 4;
   let b = 5;
   console.log(a * b);
6. 6.⚡ Which JavaScript word makes a new variable? (a) if (b) for (c) let (d) console.log()
7. 7.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .js (d) .css
8. 8.⚡ Which JavaScript word writes in the console? (a) let (b) for (c) if (d) console.log()
9. 9.⚡ What number does this code print?
   let a = 49;
   let b = 2;
   console.log(a + b);
10. 10.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Aman (b) Hi, name! (c) Hi, Aman! (d) name
11. 11.⚡ What number does this code print?
    let a = 45;
    let b = 22;
    console.log(a + b);
12. 12.⚡ What does alert() show? (a) a picture (b) a pop-up box (c) a table (d) a new tab
13. 13.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) name (b) Aman (c) Hi, Aman! (d) Hi, name!
14. 14.⚡ What number does this code print?
    let a = 4;
    let b = 8;
    console.log(a * b);
15. 15.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 9;
    apples = apples - 5;
    console.log(apples);
16. 16.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Hello, Meera! (b) name (c) Hello, name! (d) Meera
17. 17.⚡ Which word makes a new variable? (a) give (b) put (c) make (d) let
18. 18.⚡ What number does this code print?
    let a = 39;
    let b = 33;
    console.log(a - b);
19. 19.⚡ What number does this code print?
    let books = 5;
    books = books + 19;
    books = books - 6;
    console.log(books);
20. 20.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Riya (b) Welcome, name! (c) name (d) Welcome, Riya!
21. 21.⚡ What number does this code print?
    let a = 24;
    let b = 9;
    console.log(a - b);
22. 22.⚡ Which JavaScript word shows a pop-up box? (a) if (b) for (c) alert() (d) console.log()
23. 23.⚡ Where does console.log() show its output? (a) on the printer (b) in the console (c) on the title bar (d) in the address bar
24. 24.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <code> (c) <js> (d) <style>
25. 25.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) name (b) Zoya (c) Welcome, Zoya! (d) Welcome, name!
26. 26.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Aman (c) name (d) Hello, Aman!
27. 27.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Hi, Arjun! (b) name (c) Arjun (d) Hi, name!
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 6;
    console.log(x + y); (a) 13 (b) 76 (c) Error
29. 29.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Zoya (c) name (d) Hello, Zoya!
30. 30.⚡ Which JavaScript word repeats code? (a) alert() (b) console.log() (c) let (d) for
31. 31.⚡ What number does this code print?
    let a = 32;
    let b = 34;
    console.log(a + b);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 5;
    console.log(x + y); (a) 75 (b) Error (c) 12
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 3;
    console.log(x + y); (a) 93 (b) 12 (c) Error
34. 34.⚡ What number does this code print?
    let coins = 5;
    coins = coins + 16;
    coins = coins - 9;
    console.log(coins);
35. 35.⚡ What number does this code print?
    let a = 49;
    let b = 11;
    console.log(a + b);
36. 36.⚡ What number does this code print?
    let coins = 9;
    coins = coins + 8;
    coins = coins - 11;
    console.log(coins);
37. 37.⚡ What number does this code print?
    let a = 6;
    let b = 8;
    console.log(a * b);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 9;
    console.log(x + y); (a) 13 (b) Error (c) 49
39. 39.⚡ What number does this code print?
    let runs = 25;
    runs = runs + 3;
    runs = runs - 19;
    console.log(runs);
40. 40.⚡ What number does this code print?
    let a = 19;
    let b = 13;
    console.log(a - b);

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