JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 395 · 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 = 11;
   let b = 6;
   console.log(a + b);
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 1;
   console.log(x + y); (a) Error (b) 10 (c) 91
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 5;
   console.log(x + y); (a) 25 (b) Error (c) 7
4. 4.⚡ Which JavaScript word runs code when true? (a) console.log() (b) if (c) alert() (d) for
5. 5.⚡ What does alert() show? (a) a pop-up box (b) a picture (c) a new tab (d) a table
6. 6.⚡ What number does this code print?
   let a = 8;
   let b = 4;
   console.log(a * b);
7. 7.⚡ Which JavaScript word shows a pop-up box? (a) let (b) alert() (c) for (d) if
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 3;
   console.log(x + y); (a) 4 (b) 13 (c) Error
9. 9.⚡ What number does this code print?
   let a = 12;
   let b = 11;
   console.log(a * b);
10. 10.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Kabir (d) Hello, Kabir!
11. 11.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) if (c) for (d) let
12. 12.⚡ What number does this code print?
    let score = 23;
    score = score + 12;
    score = score - 16;
    console.log(score);
13. 13.⚡ 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
14. 14.⚡ What number does this code print?
    let a = 60;
    let b = 6;
    console.log(a - b);
15. 15.⚡ What does JavaScript add to a web page? (a) actions and changes (b) only colours (c) the domain name (d) the page title
16. 16.⚡ What number does this code print?
    let apples = 11;
    apples = apples + 8;
    apples = apples - 2;
    console.log(apples);
17. 17.⚡ Which JavaScript word writes in the console? (a) for (b) let (c) alert() (d) console.log()
18. 18.⚡ What number does this code print?
    let a = 25;
    let b = 19;
    console.log(a - b);
19. 19.⚡ What number does this code print?
    let a = 5;
    let b = 7;
    console.log(a * b);
20. 20.⚡ What number does this code print?
    let apples = 30;
    apples = apples + 15;
    apples = apples - 31;
    console.log(apples);
21. 21.⚡ What number does this code print?
    let books = 6;
    books = books + 5;
    books = books - 7;
    console.log(books);
22. 22.⚡ What number does this code print?
    let coins = 26;
    coins = coins + 3;
    coins = coins - 8;
    console.log(coins);
23. 23.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Aman (b) Well done, name! (c) name (d) Well done, Aman!
24. 24.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <style> (d) <js>
25. 25.⚡ Which word makes a new variable? (a) let (b) give (c) make (d) put
26. 26.⚡ What number does this code print?
    let marks = 25;
    marks = marks + 13;
    marks = marks - 38;
    console.log(marks);
27. 27.⚡ What number does this code print?
    let runs = 27;
    runs = runs + 5;
    runs = runs - 9;
    console.log(runs);
28. 28.⚡ What number does this code print?
    let a = 23;
    let b = 22;
    console.log(a - b);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) Error (b) 8 (c) 35
30. 30.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) name (b) Aman (c) Hello, name! (d) Hello, Aman!
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 8;
    console.log(x + y); (a) Error (b) 13 (c) 58
32. 32.⚡ Which JavaScript word repeats code? (a) alert() (b) for (c) if (d) console.log()
33. 33.⚡ What number does this code print?
    let score = 25;
    score = score + 10;
    score = score - 18;
    console.log(score);
34. 34.⚡ What number does this code print?
    let coins = 6;
    coins = coins + 2;
    coins = coins - 1;
    console.log(coins);
35. 35.⚡ What number does this code print?
    let a = 39;
    let b = 12;
    console.log(a + b);
36. 36.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, Meera! (c) Well done, name! (d) Meera
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 5;
    console.log(x + y); (a) 55 (b) Error (c) 10
38. 38.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Meera (b) name (c) Welcome, name! (d) Welcome, Meera!
39. 39.⚡ What number does this code print?
    let a = 2;
    let b = 2;
    console.log(a * b);
40. 40.⚡ What number does this code print?
    let apples = 6;
    apples = apples + 10;
    apples = apples - 2;
    console.log(apples);

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