JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 607 · 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.⚡ Which JavaScript word runs code when true? (a) if (b) alert() (c) console.log() (d) for
2. 2.⚡ What does alert() show? (a) a pop-up box (b) a new tab (c) a picture (d) a table
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 8;
   console.log(x + y); (a) 16 (b) Error (c) 88
4. 4.⚡ Where does console.log() show its output? (a) in the console (b) in the address bar (c) on the title bar (d) on the printer
5. 5.⚡ What does this code show?
   let name = "Meera";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) Meera (c) name (d) Hello, Meera!
6. 6.⚡ What number does this code print?
   let books = 5;
   books = books + 14;
   books = books - 11;
   console.log(books);
7. 7.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) alert() (c) if (d) for
8. 8.⚡ Which JavaScript word makes a new variable? (a) let (b) if (c) alert() (d) console.log()
9. 9.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <code> (d) <script>
10. 10.⚡ What number does this code print?
    let a = 51;
    let b = 30;
    console.log(a - b);
11. 11.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Zoya (b) name (c) Welcome, name! (d) Welcome, Zoya!
12. 12.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Hi, Aman! (b) Aman (c) Hi, name! (d) name
13. 13.⚡ What number does this code print?
    let a = 17;
    let b = 9;
    console.log(a - b);
14. 14.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) name (b) Hello, Aman! (c) Hello, name! (d) Aman
15. 15.⚡ What number does this code print?
    let a = 40;
    let b = 12;
    console.log(a + b);
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) Error (b) 11 (c) 56
17. 17.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) name (b) Well done, Riya! (c) Riya (d) Well done, name!
18. 18.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) if (d) console.log()
19. 19.⚡ What number does this code print?
    let marks = 29;
    marks = marks + 15;
    marks = marks - 32;
    console.log(marks);
20. 20.⚡ Which JavaScript word repeats code? (a) if (b) for (c) alert() (d) console.log()
21. 21.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, Meera! (c) Meera (d) Welcome, name!
22. 22.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) only colours (d) the page title
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 4;
    console.log(x + y); (a) 6 (b) Error (c) 24
24. 24.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Arjun (d) Well done, Arjun!
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 6;
    console.log(x + y); (a) 16 (b) Error (c) 7
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 4;
    console.log(x + y); (a) Error (b) 74 (c) 11
27. 27.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Riya (d) Hi, Riya!
28. 28.⚡ What number does this code print?
    let a = 27;
    let b = 32;
    console.log(a + b);
29. 29.⚡ What number does this code print?
    let a = 7;
    let b = 9;
    console.log(a * b);
30. 30.⚡ Which word makes a new variable? (a) put (b) let (c) make (d) give
31. 31.⚡ What number does this code print?
    let a = 3;
    let b = 2;
    console.log(a * b);
32. 32.⚡ What number does this code print?
    let runs = 7;
    runs = runs + 4;
    runs = runs - 10;
    console.log(runs);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 7;
    console.log(x + y); (a) 77 (b) 14 (c) Error
34. 34.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Meera (d) Hi, Meera!
35. 35.⚡ What number does this code print?
    let marks = 22;
    marks = marks + 8;
    marks = marks - 27;
    console.log(marks);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y); (a) Error (b) 7 (c) 52
37. 37.⚡ What number does this code print?
    let a = 13;
    let b = 23;
    console.log(a + b);
38. 38.⚡ What number does this code print?
    let marks = 8;
    marks = marks + 7;
    marks = marks - 10;
    console.log(marks);
39. 39.⚡ What number does this code print?
    let coins = 16;
    coins = coins + 10;
    coins = coins - 22;
    console.log(coins);
40. 40.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Kabir! (d) Kabir

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