JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 214 · 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 print? (Look at the quotes!)
   let x = "9";
   let y = 1;
   console.log(x + y); (a) 10 (b) Error (c) 91
2. 2.⚡ What number does this code print?
   let a = 32;
   let b = 24;
   console.log(a + b);
3. 3.⚡ What does this code show?
   let name = "Zoya";
   console.log("Hi, " + name + "!"); (a) Zoya (b) Hi, Zoya! (c) Hi, name! (d) name
4. 4.⚡ What number does this code print?
   let marks = 16;
   marks = marks + 7;
   marks = marks - 14;
   console.log(marks);
5. 5.⚡ What does this code show?
   let name = "Meera";
   console.log("Welcome, " + name + "!"); (a) Meera (b) Welcome, Meera! (c) name (d) Welcome, name!
6. 6.⚡ What does alert() show? (a) a table (b) a picture (c) a pop-up box (d) a new tab
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 1;
   console.log(x + y); (a) 71 (b) Error (c) 8
8. 8.⚡ What number does this code print?
   let a = 43;
   let b = 23;
   console.log(a + b);
9. 9.⚡ What number does this code print?
   let score = 12;
   score = score + 15;
   score = score - 18;
   console.log(score);
10. 10.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .jpg (d) .js
11. 11.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Aman (b) name (c) Well done, name! (d) Well done, Aman!
12. 12.⚡ What number does this code print?
    let score = 18;
    score = score + 13;
    score = score - 23;
    console.log(score);
13. 13.⚡ What number does this code print?
    let runs = 11;
    runs = runs + 17;
    runs = runs - 8;
    console.log(runs);
14. 14.⚡ Which JavaScript word runs code when true? (a) alert() (b) let (c) if (d) for
15. 15.⚡ 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
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 5;
    console.log(x + y); (a) 45 (b) 9 (c) Error
17. 17.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Meera (b) Hello, Meera! (c) name (d) Hello, name!
18. 18.⚡ Which JavaScript word shows a pop-up box? (a) let (b) if (c) alert() (d) console.log()
19. 19.⚡ Which JavaScript word writes in the console? (a) console.log() (b) for (c) let (d) if
20. 20.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <style> (d) <js>
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) Error (b) 11 (c) 2
22. 22.⚡ What number does this code print?
    let books = 6;
    books = books + 14;
    books = books - 1;
    console.log(books);
23. 23.⚡ What number does this code print?
    let a = 9;
    let b = 12;
    console.log(a * b);
24. 24.⚡ What number does this code print?
    let a = 18;
    let b = 5;
    console.log(a - b);
25. 25.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) Meera (b) Well done, name! (c) name (d) Well done, Meera!
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y); (a) 11 (b) 83 (c) Error
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y); (a) Error (b) 8 (c) 44
28. 28.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, Zoya! (b) name (c) Welcome, name! (d) Zoya
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 7;
    console.log(x + y); (a) Error (b) 37 (c) 10
30. 30.⚡ What number does this code print?
    let a = 3;
    let b = 2;
    console.log(a * b);
31. 31.⚡ Which JavaScript word repeats code? (a) if (b) let (c) alert() (d) for
32. 32.⚡ Where does console.log() show its output? (a) in the address bar (b) in the console (c) on the title bar (d) on the printer
33. 33.⚡ What number does this code print?
    let a = 42;
    let b = 39;
    console.log(a - b);
34. 34.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) name (b) Zoya (c) Hello, name! (d) Hello, Zoya!
35. 35.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Arjun! (d) Arjun
36. 36.⚡ Which JavaScript word makes a new variable? (a) let (b) console.log() (c) for (d) if
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) Error (b) 63 (c) 9
38. 38.⚡ What number does this code print?
    let a = 7;
    let b = 2;
    console.log(a * b);
39. 39.⚡ What number does this code print?
    let score = 21;
    score = score + 6;
    score = score - 5;
    console.log(score);
40. 40.⚡ Which word makes a new variable? (a) make (b) let (c) put (d) give

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