JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 594 · 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 repeats code? (a) for (b) alert() (c) let (d) console.log()
2. 2.⚡ Which JavaScript word shows a pop-up box? (a) let (b) if (c) alert() (d) console.log()
3. 3.⚡ What number does this code print?
   let score = 17;
   score = score + 7;
   score = score - 16;
   console.log(score);
4. 4.⚡ Which JavaScript word runs code when true? (a) if (b) let (c) console.log() (d) for
5. 5.⚡ What does this code show?
   let name = "Riya";
   console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Riya! (c) Riya (d) name
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 4;
   console.log(x + y); (a) 14 (b) 5 (c) Error
7. 7.⚡ 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
8. 8.⚡ Which JavaScript word makes a new variable? (a) if (b) for (c) let (d) console.log()
9. 9.⚡ What number does this code print?
   let coins = 15;
   coins = coins + 5;
   coins = coins - 7;
   console.log(coins);
10. 10.⚡ Which JavaScript word writes in the console? (a) let (b) if (c) console.log() (d) alert()
11. 11.⚡ What number does this code print?
    let a = 5;
    let b = 4;
    console.log(a * b);
12. 12.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) name (b) Meera (c) Hi, name! (d) Hi, Meera!
13. 13.⚡ What number does this code print?
    let a = 46;
    let b = 26;
    console.log(a - b);
14. 14.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Zoya! (c) Zoya (d) name
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y); (a) Error (b) 4 (c) 31
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 7;
    console.log(x + y); (a) 11 (b) 47 (c) Error
17. 17.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <script> (d) <style>
18. 18.⚡ What number does this code print?
    let a = 4;
    let b = 10;
    console.log(a * b);
19. 19.⚡ What does alert() show? (a) a table (b) a picture (c) a pop-up box (d) a new tab
20. 20.⚡ What number does this code print?
    let score = 7;
    score = score + 3;
    score = score - 5;
    console.log(score);
21. 21.⚡ What number does this code print?
    let a = 44;
    let b = 30;
    console.log(a + b);
22. 22.⚡ What number does this code print?
    let score = 7;
    score = score + 19;
    score = score - 6;
    console.log(score);
23. 23.⚡ What number does this code print?
    let marks = 14;
    marks = marks + 12;
    marks = marks - 17;
    console.log(marks);
24. 24.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Aman (d) Hello, Aman!
25. 25.⚡ 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
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) Error (b) 41 (c) 5
27. 27.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .js (c) .css (d) .html
28. 28.⚡ What number does this code print?
    let a = 39;
    let b = 1;
    console.log(a + b);
29. 29.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Arjun (d) Welcome, Arjun!
30. 30.⚡ Which word makes a new variable? (a) make (b) put (c) let (d) give
31. 31.⚡ What number does this code print?
    let a = 9;
    let b = 2;
    console.log(a * b);
32. 32.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Hi, Aman! (b) Hi, name! (c) name (d) Aman
33. 33.⚡ What number does this code print?
    let a = 60;
    let b = 36;
    console.log(a + b);
34. 34.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) Zoya (b) Hi, Zoya! (c) name (d) Hi, name!
35. 35.⚡ What number does this code print?
    let a = 43;
    let b = 28;
    console.log(a + b);
36. 36.⚡ What number does this code print?
    let books = 13;
    books = books + 9;
    books = books - 21;
    console.log(books);
37. 37.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Welcome, Aman! (b) Aman (c) name (d) Welcome, name!
38. 38.⚡ What does JavaScript add to a web page? (a) only colours (b) actions and changes (c) the domain name (d) the page title
39. 39.⚡ What number does this code print?
    let a = 21;
    let b = 4;
    console.log(a - b);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) 23 (b) 5 (c) Error

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