JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 295 · 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 a = 17;
   let b = 2;
   console.log(a + b);
2. 2.⚡ What number does this code print?
   let a = 25;
   let b = 18;
   console.log(a + b);
3. 3.⚡ What number does this code print?
   let score = 19;
   score = score + 15;
   score = score - 9;
   console.log(score);
4. 4.⚡ Which JavaScript word repeats code? (a) alert() (b) let (c) console.log() (d) for
5. 5.⚡ What does this code show?
   let name = "Zoya";
   console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Well done, Zoya! (d) Zoya
6. 6.⚡ What does this code show?
   let name = "Arjun";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Arjun (d) Hello, Arjun!
7. 7.⚡ What number does this code print?
   let a = 44;
   let b = 15;
   console.log(a + b);
8. 8.⚡ What number does this code print?
   let a = 57;
   let b = 39;
   console.log(a + b);
9. 9.⚡ What number does this code print?
   let a = 7;
   let b = 11;
   console.log(a * b);
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) 32 (b) Error (c) 5
11. 11.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <code> (d) <style>
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 1;
    console.log(x + y); (a) Error (b) 8 (c) 71
13. 13.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) console.log() (c) let (d) for
14. 14.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .js (c) .html (d) .css
15. 15.⚡ Where does console.log() show its output? (a) in the console (b) in the address bar (c) on the printer (d) on the title bar
16. 16.⚡ Which word makes a new variable? (a) put (b) give (c) make (d) let
17. 17.⚡ What number does this code print?
    let coins = 14;
    coins = coins + 2;
    coins = coins - 1;
    console.log(coins);
18. 18.⚡ Which JavaScript word makes a new variable? (a) for (b) let (c) alert() (d) if
19. 19.⚡ What number does this code print?
    let a = 6;
    let b = 4;
    console.log(a * b);
20. 20.⚡ What number does this code print?
    let runs = 25;
    runs = runs + 3;
    runs = runs - 6;
    console.log(runs);
21. 21.⚡ What number does this code print?
    let a = 6;
    let b = 8;
    console.log(a * b);
22. 22.⚡ What number does this code print?
    let marks = 23;
    marks = marks + 18;
    marks = marks - 39;
    console.log(marks);
23. 23.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Aman! (c) Aman (d) Welcome, name!
24. 24.⚡ What number does this code print?
    let a = 45;
    let b = 28;
    console.log(a - b);
25. 25.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Riya (c) Well done, Riya! (d) name
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y); (a) 8 (b) Error (c) 62
27. 27.⚡ What number does this code print?
    let books = 15;
    books = books + 17;
    books = books - 30;
    console.log(books);
28. 28.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Zoya (d) Well done, Zoya!
29. 29.⚡ What number does this code print?
    let a = 3;
    let b = 9;
    console.log(a * b);
30. 30.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) only colours (d) the domain name
31. 31.⚡ What number does this code print?
    let books = 13;
    books = books + 16;
    books = books - 10;
    console.log(books);
32. 32.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Kabir (b) Hello, Kabir! (c) Hello, name! (d) name
33. 33.⚡ What number does this code print?
    let apples = 28;
    apples = apples + 2;
    apples = apples - 4;
    console.log(apples);
34. 34.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Riya! (c) Riya (d) Welcome, name!
35. 35.⚡ What number does this code print?
    let a = 26;
    let b = 7;
    console.log(a - b);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y); (a) 31 (b) 4 (c) Error
37. 37.⚡ What number does this code print?
    let a = 45;
    let b = 31;
    console.log(a + b);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) 33 (b) Error (c) 6
39. 39.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) name (b) Arjun (c) Well done, name! (d) Well done, Arjun!
40. 40.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Riya (c) name (d) Welcome, Riya!

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