JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 898 · 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.⚡ Where does console.log() show its output? (a) in the console (b) on the title bar (c) in the address bar (d) on the printer
2. 2.⚡ Which JavaScript word repeats code? (a) let (b) console.log() (c) if (d) for
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 1;
   console.log(x + y); (a) 9 (b) 81 (c) Error
4. 4.⚡ Which JavaScript word shows a pop-up box? (a) for (b) if (c) let (d) alert()
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 9;
   console.log(x + y); (a) 99 (b) 18 (c) Error
6. 6.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <script> (d) <js>
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 2;
   console.log(x + y); (a) 62 (b) Error (c) 8
8. 8.⚡ Which JavaScript word writes in the console? (a) alert() (b) console.log() (c) let (d) for
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 9;
   console.log(x + y); (a) Error (b) 12 (c) 39
10. 10.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Arjun (b) Hi, Arjun! (c) name (d) Hi, name!
11. 11.⚡ What number does this code print?
    let a = 5;
    let b = 3;
    console.log(a * b);
12. 12.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) Well done, Meera! (b) Meera (c) Well done, name! (d) name
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 4;
    console.log(x + y); (a) Error (b) 94 (c) 13
14. 14.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) name (b) Aman (c) Welcome, name! (d) Welcome, Aman!
15. 15.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Arjun (c) name (d) Hello, Arjun!
16. 16.⚡ Which word makes a new variable? (a) let (b) put (c) make (d) give
17. 17.⚡ Which JavaScript word makes a new variable? (a) alert() (b) if (c) console.log() (d) let
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y); (a) Error (b) 51 (c) 6
19. 19.⚡ 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
20. 20.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, Meera! (c) Hi, name! (d) Meera
21. 21.⚡ Which JavaScript word runs code when true? (a) for (b) console.log() (c) alert() (d) if
22. 22.⚡ 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
23. 23.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Zoya! (c) Welcome, name! (d) Zoya
24. 24.⚡ What number does this code print?
    let marks = 9;
    marks = marks + 19;
    marks = marks - 6;
    console.log(marks);
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) 12 (b) 3 (c) Error
26. 26.⚡ What number does this code print?
    let apples = 21;
    apples = apples + 8;
    apples = apples - 4;
    console.log(apples);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 1;
    console.log(x + y); (a) 61 (b) 7 (c) Error
28. 28.⚡ What number does this code print?
    let apples = 13;
    apples = apples + 9;
    apples = apples - 7;
    console.log(apples);
29. 29.⚡ What number does this code print?
    let a = 8;
    let b = 5;
    console.log(a * b);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) Error (b) 5 (c) 41
31. 31.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) name (b) Zoya (c) Hello, name! (d) Hello, Zoya!
32. 32.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Riya (b) Hi, Riya! (c) name (d) Hi, name!
33. 33.⚡ What does alert() show? (a) a pop-up box (b) a picture (c) a new tab (d) a table
34. 34.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, Riya! (b) Riya (c) name (d) Welcome, name!
35. 35.⚡ What number does this code print?
    let a = 43;
    let b = 14;
    console.log(a - b);
36. 36.⚡ What number does this code print?
    let apples = 19;
    apples = apples + 5;
    apples = apples - 10;
    console.log(apples);
37. 37.⚡ What number does this code print?
    let marks = 5;
    marks = marks + 15;
    marks = marks - 2;
    console.log(marks);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 7;
    console.log(x + y); (a) Error (b) 10 (c) 37
39. 39.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, Riya! (b) name (c) Hello, name! (d) Riya
40. 40.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Riya (b) Welcome, name! (c) name (d) Welcome, Riya!

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