JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 697 · 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 = 9;
   let b = 17;
   console.log(a + b);
2. 2.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <style> (d) <script>
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 5;
   console.log(x + y); (a) 65 (b) 11 (c) Error
4. 4.⚡ What number does this code print?
   let a = 52;
   let b = 22;
   console.log(a + b);
5. 5.⚡ What does this code show?
   let name = "Kabir";
   console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Kabir (d) Hi, Kabir!
6. 6.⚡ What does alert() show? (a) a picture (b) a pop-up box (c) a new tab (d) a table
7. 7.⚡ Which JavaScript word repeats code? (a) let (b) if (c) console.log() (d) for
8. 8.⚡ What number does this code print?
   let a = 11;
   let b = 12;
   console.log(a + b);
9. 9.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .jpg (c) .html (d) .css
10. 10.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Meera (c) name (d) Welcome, Meera!
11. 11.⚡ What does JavaScript add to a web page? (a) only colours (b) actions and changes (c) the domain name (d) the page title
12. 12.⚡ Which JavaScript word writes in the console? (a) console.log() (b) let (c) alert() (d) if
13. 13.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Riya (c) name (d) Hello, Riya!
14. 14.⚡ Which JavaScript word shows a pop-up box? (a) if (b) console.log() (c) for (d) alert()
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 8;
    console.log(x + y); (a) Error (b) 98 (c) 17
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 4;
    console.log(x + y); (a) 84 (b) Error (c) 12
17. 17.⚡ What number does this code print?
    let books = 8;
    books = books + 17;
    books = books - 9;
    console.log(books);
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 6;
    console.log(x + y); (a) Error (b) 13 (c) 76
19. 19.⚡ What number does this code print?
    let books = 11;
    books = books + 3;
    books = books - 9;
    console.log(books);
20. 20.⚡ What number does this code print?
    let score = 16;
    score = score + 18;
    score = score - 31;
    console.log(score);
21. 21.⚡ What number does this code print?
    let books = 8;
    books = books + 3;
    books = books - 9;
    console.log(books);
22. 22.⚡ 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
23. 23.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Hello, Zoya! (b) Hello, name! (c) name (d) Zoya
24. 24.⚡ Which word makes a new variable? (a) let (b) make (c) put (d) give
25. 25.⚡ Which JavaScript word makes a new variable? (a) let (b) if (c) console.log() (d) for
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 9;
    console.log(x + y); (a) 18 (b) Error (c) 99
27. 27.⚡ What number does this code print?
    let coins = 29;
    coins = coins + 2;
    coins = coins - 5;
    console.log(coins);
28. 28.⚡ What number does this code print?
    let a = 46;
    let b = 26;
    console.log(a + b);
29. 29.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Aman (b) Welcome, Aman! (c) Welcome, name! (d) name
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) 11 (b) Error (c) 2
31. 31.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Hi, Zoya! (b) name (c) Zoya (d) Hi, name!
32. 32.⚡ What number does this code print?
    let a = 20;
    let b = 2;
    console.log(a - b);
33. 33.⚡ What number does this code print?
    let apples = 22;
    apples = apples + 9;
    apples = apples - 30;
    console.log(apples);
34. 34.⚡ What number does this code print?
    let a = 26;
    let b = 12;
    console.log(a - b);
35. 35.⚡ What number does this code print?
    let apples = 30;
    apples = apples + 10;
    apples = apples - 20;
    console.log(apples);
36. 36.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Arjun (b) name (c) Welcome, Arjun! (d) Welcome, name!
37. 37.⚡ What number does this code print?
    let coins = 13;
    coins = coins + 8;
    coins = coins - 6;
    console.log(coins);
38. 38.⚡ What number does this code print?
    let a = 37;
    let b = 12;
    console.log(a + b);
39. 39.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Riya (b) name (c) Well done, Riya! (d) Well done, name!
40. 40.⚡ What number does this code print?
    let a = 32;
    let b = 7;
    console.log(a - b);

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