JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 751 · 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.⚡ Which JavaScript word repeats code? (a) if (b) alert() (c) console.log() (d) for
2. 2.⚡ What number does this code print?
   let a = 2;
   let b = 3;
   console.log(a * b);
3. 3.⚡ Which word makes a new variable? (a) let (b) give (c) make (d) put
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 6;
   console.log(x + y); (a) Error (b) 14 (c) 86
5. 5.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <code> (d) <script>
6. 6.⚡ 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
7. 7.⚡ What number does this code print?
   let a = 10;
   let b = 14;
   console.log(a + b);
8. 8.⚡ What number does this code print?
   let score = 5;
   score = score + 4;
   score = score - 4;
   console.log(score);
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 9;
   console.log(x + y); (a) 17 (b) 89 (c) Error
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y); (a) 91 (b) Error (c) 10
11. 11.⚡ Which JavaScript word writes in the console? (a) let (b) console.log() (c) alert() (d) if
12. 12.⚡ What does JavaScript add to a web page? (a) only colours (b) actions and changes (c) the page title (d) the domain name
13. 13.⚡ What number does this code print?
    let a = 5;
    let b = 13;
    console.log(a + b);
14. 14.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) Kabir (b) Hi, Kabir! (c) name (d) Hi, name!
15. 15.⚡ What number does this code print?
    let books = 19;
    books = books + 11;
    books = books - 2;
    console.log(books);
16. 16.⚡ What number does this code print?
    let a = 8;
    let b = 36;
    console.log(a + b);
17. 17.⚡ Which JavaScript word makes a new variable? (a) if (b) alert() (c) let (d) console.log()
18. 18.⚡ What number does this code print?
    let a = 57;
    let b = 34;
    console.log(a + b);
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y); (a) 7 (b) Error (c) 52
20. 20.⚡ What does alert() show? (a) a table (b) a new tab (c) a pop-up box (d) a picture
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) 8 (b) 35 (c) Error
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) Error (b) 21 (c) 3
23. 23.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .css (d) .jpg
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 5;
    console.log(x + y); (a) 13 (b) 85 (c) Error
25. 25.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Arjun! (d) Arjun
26. 26.⚡ What number does this code print?
    let apples = 15;
    apples = apples + 20;
    apples = apples - 23;
    console.log(apples);
27. 27.⚡ What number does this code print?
    let a = 6;
    let b = 6;
    console.log(a * b);
28. 28.⚡ What number does this code print?
    let a = 37;
    let b = 10;
    console.log(a - b);
29. 29.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, Riya! (b) name (c) Well done, name! (d) Riya
30. 30.⚡ 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
31. 31.⚡ Which JavaScript word runs code when true? (a) let (b) console.log() (c) alert() (d) if
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 9;
    console.log(x + y); (a) 11 (b) 29 (c) Error
33. 33.⚡ What number does this code print?
    let apples = 22;
    apples = apples + 17;
    apples = apples - 12;
    console.log(apples);
34. 34.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) console.log() (c) let (d) if
35. 35.⚡ What number does this code print?
    let a = 38;
    let b = 31;
    console.log(a - b);
36. 36.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Meera (c) name (d) Well done, Meera!
37. 37.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Kabir (d) Hello, Kabir!
38. 38.⚡ What number does this code print?
    let marks = 15;
    marks = marks + 14;
    marks = marks - 17;
    console.log(marks);
39. 39.⚡ What number does this code print?
    let a = 31;
    let b = 37;
    console.log(a + b);
40. 40.⚡ What number does this code print?
    let a = 37;
    let b = 13;
    console.log(a + b);

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