JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 257 · 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 marks = 5;
   marks = marks + 5;
   marks = marks - 5;
   console.log(marks);
2. 2.⚡ Which JavaScript word repeats code? (a) console.log() (b) for (c) alert() (d) if
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 6;
   console.log(x + y); (a) Error (b) 9 (c) 36
4. 4.⚡ What number does this code print?
   let a = 27;
   let b = 10;
   console.log(a - b);
5. 5.⚡ What number does this code print?
   let coins = 18;
   coins = coins + 8;
   coins = coins - 13;
   console.log(coins);
6. 6.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) actions and changes (d) only colours
7. 7.⚡ What number does this code print?
   let a = 13;
   let b = 30;
   console.log(a + b);
8. 8.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <script> (d) <code>
9. 9.⚡ What does this code show?
   let name = "Kabir";
   console.log("Well done, " + name + "!"); (a) Kabir (b) Well done, name! (c) Well done, Kabir! (d) name
10. 10.⚡ What number does this code print?
    let a = 43;
    let b = 6;
    console.log(a + b);
11. 11.⚡ Where does console.log() show its output? (a) in the console (b) on the title bar (c) on the printer (d) in the address bar
12. 12.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Riya (c) name (d) Well done, Riya!
13. 13.⚡ What number does this code print?
    let books = 9;
    books = books + 10;
    books = books - 2;
    console.log(books);
14. 14.⚡ What number does this code print?
    let marks = 24;
    marks = marks + 18;
    marks = marks - 13;
    console.log(marks);
15. 15.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) name (b) Arjun (c) Hello, Arjun! (d) Hello, name!
16. 16.⚡ What number does this code print?
    let score = 8;
    score = score + 10;
    score = score - 9;
    console.log(score);
17. 17.⚡ What number does this code print?
    let books = 11;
    books = books + 17;
    books = books - 13;
    console.log(books);
18. 18.⚡ What number does this code print?
    let apples = 27;
    apples = apples + 8;
    apples = apples - 23;
    console.log(apples);
19. 19.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .html (d) .js
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y); (a) 7 (b) 52 (c) Error
21. 21.⚡ What number does this code print?
    let a = 12;
    let b = 9;
    console.log(a * b);
22. 22.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Riya (b) Welcome, Riya! (c) name (d) Welcome, name!
23. 23.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Arjun (c) Well done, Arjun! (d) name
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y); (a) Error (b) 46 (c) 10
25. 25.⚡ What number does this code print?
    let score = 24;
    score = score + 13;
    score = score - 6;
    console.log(score);
26. 26.⚡ What number does this code print?
    let runs = 24;
    runs = runs + 7;
    runs = runs - 22;
    console.log(runs);
27. 27.⚡ Which JavaScript word shows a pop-up box? (a) if (b) let (c) for (d) alert()
28. 28.⚡ What number does this code print?
    let a = 30;
    let b = 25;
    console.log(a - b);
29. 29.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Meera (b) Hi, name! (c) name (d) Hi, Meera!
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 8;
    console.log(x + y); (a) Error (b) 48 (c) 12
31. 31.⚡ What number does this code print?
    let score = 22;
    score = score + 12;
    score = score - 6;
    console.log(score);
32. 32.⚡ What number does this code print?
    let marks = 5;
    marks = marks + 10;
    marks = marks - 15;
    console.log(marks);
33. 33.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) for (d) console.log()
34. 34.⚡ What number does this code print?
    let coins = 22;
    coins = coins + 6;
    coins = coins - 26;
    console.log(coins);
35. 35.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Riya (c) name (d) Hi, Riya!
36. 36.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Kabir (b) name (c) Welcome, Kabir! (d) Welcome, name!
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 5;
    console.log(x + y); (a) 12 (b) 75 (c) Error
38. 38.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Aman (c) Hi, Aman! (d) name
39. 39.⚡ Which JavaScript word runs code when true? (a) if (b) let (c) console.log() (d) for
40. 40.⚡ What number does this code print?
    let coins = 16;
    coins = coins + 13;
    coins = coins - 18;
    console.log(coins);

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