JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 337 · 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 = "1";
   let y = 2;
   console.log(x + y); (a) 3 (b) Error (c) 12
2. 2.⚡ What does this code show?
   let name = "Aman";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Aman (d) Hello, Aman!
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 2;
   console.log(x + y); (a) 82 (b) 10 (c) Error
4. 4.⚡ Which JavaScript word writes in the console? (a) let (b) if (c) for (d) console.log()
5. 5.⚡ Which JavaScript word shows a pop-up box? (a) for (b) alert() (c) if (d) console.log()
6. 6.⚡ What number does this code print?
   let a = 19;
   let b = 26;
   console.log(a + b);
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 6;
   console.log(x + y); (a) 14 (b) Error (c) 86
8. 8.⚡ Which word makes a new variable? (a) let (b) give (c) put (d) make
9. 9.⚡ What number does this code print?
   let a = 2;
   let b = 8;
   console.log(a * b);
10. 10.⚡ What number does this code print?
    let a = 10;
    let b = 7;
    console.log(a - b);
11. 11.⚡ Which JavaScript word runs code when true? (a) if (b) let (c) alert() (d) console.log()
12. 12.⚡ What number does this code print?
    let a = 9;
    let b = 1;
    console.log(a + b);
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) 13 (b) Error (c) 4
14. 14.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <script> (d) <code>
15. 15.⚡ What number does this code print?
    let marks = 5;
    marks = marks + 3;
    marks = marks - 3;
    console.log(marks);
16. 16.⚡ Where does console.log() show its output? (a) in the console (b) on the printer (c) in the address bar (d) on the title bar
17. 17.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Riya! (d) Riya
18. 18.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) name (b) Zoya (c) Hi, name! (d) Hi, Zoya!
19. 19.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, Riya! (c) Riya (d) Well done, name!
20. 20.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) the page title (d) actions and changes
21. 21.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Aman (b) Hello, Aman! (c) Hello, name! (d) name
22. 22.⚡ What number does this code print?
    let a = 21;
    let b = 39;
    console.log(a + b);
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 2;
    console.log(x + y); (a) Error (b) 92 (c) 11
24. 24.⚡ What number does this code print?
    let a = 6;
    let b = 19;
    console.log(a + b);
25. 25.⚡ Which JavaScript word makes a new variable? (a) let (b) console.log() (c) if (d) for
26. 26.⚡ What number does this code print?
    let a = 41;
    let b = 1;
    console.log(a - b);
27. 27.⚡ What number does this code print?
    let runs = 7;
    runs = runs + 3;
    runs = runs - 3;
    console.log(runs);
28. 28.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Aman (b) Welcome, name! (c) name (d) Welcome, Aman!
29. 29.⚡ What number does this code print?
    let books = 19;
    books = books + 19;
    books = books - 8;
    console.log(books);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y); (a) Error (b) 91 (c) 10
31. 31.⚡ What does alert() show? (a) a table (b) a picture (c) a new tab (d) a pop-up box
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y); (a) 7 (b) 52 (c) Error
33. 33.⚡ What number does this code print?
    let a = 48;
    let b = 5;
    console.log(a - b);
34. 34.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Well done, Aman! (b) name (c) Well done, name! (d) Aman
35. 35.⚡ Which JavaScript word repeats code? (a) alert() (b) let (c) for (d) console.log()
36. 36.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, Riya! (b) Riya (c) name (d) Welcome, name!
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 7;
    console.log(x + y); (a) 16 (b) 97 (c) Error
38. 38.⚡ What number does this code print?
    let marks = 10;
    marks = marks + 14;
    marks = marks - 9;
    console.log(marks);
39. 39.⚡ What number does this code print?
    let runs = 23;
    runs = runs + 14;
    runs = runs - 4;
    console.log(runs);
40. 40.⚡ What number does this code print?
    let a = 40;
    let b = 12;
    console.log(a - b);

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