JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 597 · 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 score = 19;
   score = score + 3;
   score = score - 2;
   console.log(score);
2. 2.⚡ Which JavaScript word makes a new variable? (a) let (b) console.log() (c) if (d) alert()
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 2;
   console.log(x + y); (a) 6 (b) Error (c) 42
4. 4.⚡ Which JavaScript word repeats code? (a) console.log() (b) if (c) alert() (d) for
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 7;
   console.log(x + y); (a) 97 (b) 16 (c) Error
6. 6.⚡ What does this code show?
   let name = "Arjun";
   alert("Well done, " + name + "!"); (a) name (b) Arjun (c) Well done, Arjun! (d) Well done, name!
7. 7.⚡ What does JavaScript add to a web page? (a) actions and changes (b) only colours (c) the page title (d) the domain name
8. 8.⚡ What does this code show?
   let name = "Meera";
   alert("Hello, " + name + "!"); (a) Hello, Meera! (b) name (c) Meera (d) Hello, name!
9. 9.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .css (c) .jpg (d) .html
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 5;
    console.log(x + y); (a) 11 (b) Error (c) 65
11. 11.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a new tab (d) a picture
12. 12.⚡ What number does this code print?
    let marks = 29;
    marks = marks + 9;
    marks = marks - 35;
    console.log(marks);
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) Error (b) 5 (c) 23
14. 14.⚡ What number does this code print?
    let a = 4;
    let b = 8;
    console.log(a * b);
15. 15.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <style> (d) <js>
16. 16.⚡ What number does this code print?
    let a = 24;
    let b = 28;
    console.log(a + b);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 3;
    console.log(x + y); (a) Error (b) 53 (c) 8
18. 18.⚡ Which JavaScript word shows a pop-up box? (a) let (b) if (c) alert() (d) console.log()
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 4;
    console.log(x + y); (a) 64 (b) Error (c) 10
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 8;
    console.log(x + y); (a) 28 (b) 10 (c) Error
21. 21.⚡ What number does this code print?
    let a = 19;
    let b = 4;
    console.log(a + b);
22. 22.⚡ What number does this code print?
    let a = 6;
    let b = 11;
    console.log(a * b);
23. 23.⚡ What number does this code print?
    let a = 31;
    let b = 36;
    console.log(a + b);
24. 24.⚡ What number does this code print?
    let score = 28;
    score = score + 19;
    score = score - 14;
    console.log(score);
25. 25.⚡ What number does this code print?
    let a = 47;
    let b = 39;
    console.log(a + b);
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 6;
    console.log(x + y); (a) 26 (b) 8 (c) Error
27. 27.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) Hi, Kabir! (b) name (c) Kabir (d) Hi, name!
28. 28.⚡ What number does this code print?
    let a = 37;
    let b = 19;
    console.log(a - b);
29. 29.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) name (b) Aman (c) Well done, Aman! (d) Well done, name!
30. 30.⚡ 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
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 8;
    console.log(x + y); (a) Error (b) 12 (c) 48
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 9;
    console.log(x + y); (a) 15 (b) 69 (c) Error
33. 33.⚡ What number does this code print?
    let a = 8;
    let b = 8;
    console.log(a * b);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 1;
    console.log(x + y); (a) 7 (b) Error (c) 61
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) 11 (b) 56 (c) Error
36. 36.⚡ Which JavaScript word writes in the console? (a) for (b) if (c) console.log() (d) alert()
37. 37.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Meera (b) Welcome, name! (c) name (d) Welcome, Meera!
38. 38.⚡ What number does this code print?
    let a = 10;
    let b = 8;
    console.log(a * b);
39. 39.⚡ Which JavaScript word runs code when true? (a) alert() (b) console.log() (c) for (d) if
40. 40.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, Arjun! (c) Arjun (d) Hi, name!

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