JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 30 · 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 show?
   let name = "Riya";
   console.log("Hello, " + name + "!"); (a) Riya (b) Hello, Riya! (c) name (d) Hello, name!
2. 2.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) let (c) console.log() (d) for
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 5;
   console.log(x + y); (a) 13 (b) Error (c) 85
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 4;
   console.log(x + y); (a) 13 (b) Error (c) 94
5. 5.⚡ Which JavaScript word runs code when true? (a) for (b) let (c) console.log() (d) if
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 2;
   console.log(x + y); (a) 92 (b) Error (c) 11
7. 7.⚡ Which word makes a new variable? (a) put (b) give (c) let (d) make
8. 8.⚡ What number does this code print?
   let a = 9;
   let b = 12;
   console.log(a * b);
9. 9.⚡ What does alert() show? (a) a picture (b) a table (c) a pop-up box (d) a new tab
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) 9 (b) Error (c) 72
11. 11.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .css (c) .jpg (d) .html
12. 12.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Hi, Kabir! (b) Hi, name! (c) Kabir (d) name
13. 13.⚡ What number does this code print?
    let a = 12;
    let b = 8;
    console.log(a * b);
14. 14.⚡ What number does this code print?
    let a = 7;
    let b = 6;
    console.log(a * b);
15. 15.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Aman! (c) Aman (d) name
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) Error (b) 35 (c) 8
17. 17.⚡ What number does this code print?
    let a = 13;
    let b = 9;
    console.log(a + b);
18. 18.⚡ What number does this code print?
    let score = 29;
    score = score + 15;
    score = score - 3;
    console.log(score);
19. 19.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) the page title (d) actions and changes
20. 20.⚡ What number does this code print?
    let a = 18;
    let b = 13;
    console.log(a + b);
21. 21.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, Meera! (c) Meera (d) Welcome, name!
22. 22.⚡ What number does this code print?
    let marks = 23;
    marks = marks + 17;
    marks = marks - 38;
    console.log(marks);
23. 23.⚡ Which JavaScript word makes a new variable? (a) alert() (b) console.log() (c) let (d) for
24. 24.⚡ What number does this code print?
    let runs = 18;
    runs = runs + 12;
    runs = runs - 1;
    console.log(runs);
25. 25.⚡ What number does this code print?
    let books = 27;
    books = books + 9;
    books = books - 4;
    console.log(books);
26. 26.⚡ What number does this code print?
    let a = 51;
    let b = 21;
    console.log(a + b);
27. 27.⚡ What number does this code print?
    let a = 10;
    let b = 21;
    console.log(a + b);
28. 28.⚡ What number does this code print?
    let apples = 18;
    apples = apples + 20;
    apples = apples - 21;
    console.log(apples);
29. 29.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <code> (d) <script>
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) 5 (b) Error (c) 23
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 5;
    console.log(x + y); (a) 9 (b) Error (c) 45
32. 32.⚡ What number does this code print?
    let a = 30;
    let b = 37;
    console.log(a + b);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y); (a) 6 (b) 51 (c) Error
34. 34.⚡ What number does this code print?
    let books = 10;
    books = books + 3;
    books = books - 11;
    console.log(books);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y); (a) 10 (b) 46 (c) Error
36. 36.⚡ Which JavaScript word writes in the console? (a) console.log() (b) alert() (c) let (d) if
37. 37.⚡ What number does this code print?
    let books = 26;
    books = books + 15;
    books = books - 3;
    console.log(books);
38. 38.⚡ What number does this code print?
    let score = 7;
    score = score + 15;
    score = score - 16;
    console.log(score);
39. 39.⚡ What number does this code print?
    let a = 39;
    let b = 37;
    console.log(a - b);
40. 40.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Zoya (c) name (d) Hello, Zoya!

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