JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 783 · 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 coins = 6;
   coins = coins + 17;
   coins = coins - 4;
   console.log(coins);
2. 2.⚡ What does this code show?
   let name = "Arjun";
   alert("Well done, " + name + "!"); (a) Arjun (b) name (c) Well done, name! (d) Well done, Arjun!
3. 3.⚡ What number does this code print?
   let a = 31;
   let b = 6;
   console.log(a + b);
4. 4.⚡ What does this code show?
   let name = "Riya";
   alert("Hello, " + name + "!"); (a) Hello, Riya! (b) Hello, name! (c) name (d) Riya
5. 5.⚡ Which JavaScript word makes a new variable? (a) alert() (b) let (c) for (d) console.log()
6. 6.⚡ Which JavaScript word runs code when true? (a) for (b) if (c) console.log() (d) let
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 3;
   console.log(x + y); (a) 8 (b) Error (c) 53
8. 8.⚡ What number does this code print?
   let apples = 18;
   apples = apples + 3;
   apples = apples - 1;
   console.log(apples);
9. 9.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) actions and changes (d) the page title
10. 10.⚡ What number does this code print?
    let a = 38;
    let b = 17;
    console.log(a + b);
11. 11.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the address bar (d) in the console
12. 12.⚡ What number does this code print?
    let a = 49;
    let b = 24;
    console.log(a - b);
13. 13.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <style> (c) <js> (d) <script>
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) 33 (b) 6 (c) Error
15. 15.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) name (b) Zoya (c) Hi, Zoya! (d) Hi, name!
16. 16.⚡ What number does this code print?
    let a = 27;
    let b = 9;
    console.log(a - b);
17. 17.⚡ What number does this code print?
    let marks = 20;
    marks = marks + 14;
    marks = marks - 13;
    console.log(marks);
18. 18.⚡ What does alert() show? (a) a picture (b) a pop-up box (c) a table (d) a new tab
19. 19.⚡ What number does this code print?
    let a = 48;
    let b = 16;
    console.log(a + b);
20. 20.⚡ What number does this code print?
    let a = 6;
    let b = 8;
    console.log(a * b);
21. 21.⚡ What number does this code print?
    let score = 6;
    score = score + 17;
    score = score - 23;
    console.log(score);
22. 22.⚡ Which word makes a new variable? (a) put (b) let (c) make (d) give
23. 23.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) let (c) if (d) console.log()
24. 24.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Meera (b) name (c) Welcome, Meera! (d) Welcome, name!
25. 25.⚡ What number does this code print?
    let a = 50;
    let b = 34;
    console.log(a + b);
26. 26.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Kabir (d) Welcome, Kabir!
27. 27.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Well done, Aman! (b) Well done, name! (c) Aman (d) name
28. 28.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Kabir! (c) name (d) Kabir
29. 29.⚡ What number does this code print?
    let books = 6;
    books = books + 11;
    books = books - 8;
    console.log(books);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y); (a) 44 (b) Error (c) 8
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) Error (b) 7 (c) 43
32. 32.⚡ What number does this code print?
    let a = 11;
    let b = 5;
    console.log(a * b);
33. 33.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, Riya! (b) name (c) Hi, name! (d) Riya
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 7;
    console.log(x + y); (a) 27 (b) Error (c) 9
35. 35.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Meera (b) Well done, Meera! (c) name (d) Well done, name!
36. 36.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, Aman! (c) Aman (d) Hi, name!
37. 37.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Kabir (c) Hello, Kabir! (d) name
38. 38.⚡ What number does this code print?
    let a = 54;
    let b = 32;
    console.log(a - b);
39. 39.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Meera! (c) name (d) Meera
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 4;
    console.log(x + y); (a) 94 (b) Error (c) 13

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