JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 299 · 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 = "9";
   let y = 7;
   console.log(x + y); (a) 16 (b) Error (c) 97
2. 2.⚡ Which word makes a new variable? (a) give (b) let (c) make (d) put
3. 3.⚡ What does this code show?
   let name = "Meera";
   alert("Hi, " + name + "!"); (a) Hi, name! (b) Meera (c) name (d) Hi, Meera!
4. 4.⚡ Which JavaScript word writes in the console? (a) alert() (b) console.log() (c) let (d) if
5. 5.⚡ Which JavaScript word runs code when true? (a) let (b) if (c) for (d) alert()
6. 6.⚡ What number does this code print?
   let apples = 23;
   apples = apples + 8;
   apples = apples - 13;
   console.log(apples);
7. 7.⚡ What number does this code print?
   let books = 10;
   books = books + 17;
   books = books - 21;
   console.log(books);
8. 8.⚡ What number does this code print?
   let a = 60;
   let b = 10;
   console.log(a + b);
9. 9.⚡ Which JavaScript word shows a pop-up box? (a) let (b) alert() (c) if (d) for
10. 10.⚡ What number does this code print?
    let runs = 16;
    runs = runs + 3;
    runs = runs - 12;
    console.log(runs);
11. 11.⚡ What number does this code print?
    let a = 9;
    let b = 11;
    console.log(a * b);
12. 12.⚡ What number does this code print?
    let a = 38;
    let b = 6;
    console.log(a - b);
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 4;
    console.log(x + y); (a) 84 (b) 12 (c) Error
14. 14.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Kabir (b) name (c) Well done, name! (d) Well done, Kabir!
15. 15.⚡ What number does this code print?
    let a = 7;
    let b = 8;
    console.log(a + b);
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) Error (b) 56 (c) 11
17. 17.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Riya (d) Well done, Riya!
18. 18.⚡ What number does this code print?
    let a = 39;
    let b = 14;
    console.log(a + b);
19. 19.⚡ Which JavaScript word makes a new variable? (a) for (b) alert() (c) console.log() (d) let
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) Error (b) 2 (c) 11
21. 21.⚡ Which JavaScript word repeats code? (a) console.log() (b) if (c) alert() (d) for
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y); (a) 31 (b) Error (c) 4
23. 23.⚡ What number does this code print?
    let books = 8;
    books = books + 18;
    books = books - 12;
    console.log(books);
24. 24.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <code> (c) <style> (d) <js>
25. 25.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) name (b) Zoya (c) Hi, Zoya! (d) Hi, name!
26. 26.⚡ What does JavaScript add to a web page? (a) the page title (b) only colours (c) the domain name (d) actions and changes
27. 27.⚡ What number does this code print?
    let coins = 19;
    coins = coins + 4;
    coins = coins - 21;
    console.log(coins);
28. 28.⚡ 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
29. 29.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Zoya (c) Welcome, Zoya! (d) name
30. 30.⚡ What number does this code print?
    let a = 46;
    let b = 19;
    console.log(a + b);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y); (a) Error (b) 44 (c) 8
32. 32.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Well done, Arjun! (b) Arjun (c) Well done, name! (d) name
33. 33.⚡ What number does this code print?
    let a = 19;
    let b = 16;
    console.log(a - b);
34. 34.⚡ What number does this code print?
    let marks = 15;
    marks = marks + 2;
    marks = marks - 1;
    console.log(marks);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) Error (b) 3 (c) 21
36. 36.⚡ What number does this code print?
    let score = 20;
    score = score + 3;
    score = score - 12;
    console.log(score);
37. 37.⚡ What number does this code print?
    let marks = 21;
    marks = marks + 2;
    marks = marks - 22;
    console.log(marks);
38. 38.⚡ What number does this code print?
    let runs = 17;
    runs = runs + 7;
    runs = runs - 17;
    console.log(runs);
39. 39.⚡ 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
40. 40.⚡ What number does this code print?
    let coins = 21;
    coins = coins + 5;
    coins = coins - 21;
    console.log(coins);

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