JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 730 · 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 = "3";
   let y = 6;
   console.log(x + y); (a) Error (b) 36 (c) 9
2. 2.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) for (c) if (d) let
3. 3.⚡ Which word makes a new variable? (a) make (b) give (c) let (d) put
4. 4.⚡ What number does this code print?
   let a = 8;
   let b = 7;
   console.log(a * b);
5. 5.⚡ What does this code show?
   let name = "Riya";
   console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Riya! (d) Riya
6. 6.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) for (d) console.log()
7. 7.⚡ Which JavaScript word repeats code? (a) for (b) if (c) console.log() (d) alert()
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 3;
   console.log(x + y); (a) 23 (b) Error (c) 5
9. 9.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <style> (d) <js>
10. 10.⚡ What number does this code print?
    let books = 12;
    books = books + 14;
    books = books - 23;
    console.log(books);
11. 11.⚡ What number does this code print?
    let a = 2;
    let b = 3;
    console.log(a * b);
12. 12.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Aman! (c) Aman (d) Welcome, name!
13. 13.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Well done, Zoya! (b) Well done, name! (c) name (d) Zoya
14. 14.⚡ What number does this code print?
    let score = 13;
    score = score + 16;
    score = score - 13;
    console.log(score);
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 7;
    console.log(x + y); (a) Error (b) 47 (c) 11
16. 16.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Kabir! (d) Kabir
17. 17.⚡ What number does this code print?
    let a = 16;
    let b = 2;
    console.log(a + b);
18. 18.⚡ What number does this code print?
    let a = 4;
    let b = 5;
    console.log(a * b);
19. 19.⚡ What number does this code print?
    let a = 9;
    let b = 12;
    console.log(a * b);
20. 20.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .html (d) .js
21. 21.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) only colours (d) actions and changes
22. 22.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Aman (c) Well done, Aman! (d) name
23. 23.⚡ What number does this code print?
    let a = 60;
    let b = 26;
    console.log(a + b);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 4;
    console.log(x + y); (a) Error (b) 5 (c) 14
25. 25.⚡ Where does console.log() show its output? (a) in the address bar (b) in the console (c) on the printer (d) on the title bar
26. 26.⚡ What does alert() show? (a) a picture (b) a table (c) a new tab (d) a pop-up box
27. 27.⚡ What number does this code print?
    let apples = 9;
    apples = apples + 7;
    apples = apples - 15;
    console.log(apples);
28. 28.⚡ What number does this code print?
    let apples = 6;
    apples = apples + 17;
    apples = apples - 18;
    console.log(apples);
29. 29.⚡ What number does this code print?
    let a = 21;
    let b = 13;
    console.log(a - b);
30. 30.⚡ What number does this code print?
    let apples = 16;
    apples = apples + 14;
    apples = apples - 13;
    console.log(apples);
31. 31.⚡ 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
32. 32.⚡ What number does this code print?
    let a = 50;
    let b = 39;
    console.log(a + b);
33. 33.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Zoya! (c) Welcome, name! (d) Zoya
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) Error (b) 41 (c) 5
35. 35.⚡ What number does this code print?
    let a = 4;
    let b = 6;
    console.log(a * b);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) 5 (b) Error (c) 32
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 2;
    console.log(x + y); (a) 11 (b) Error (c) 92
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 9;
    console.log(x + y); (a) Error (b) 13 (c) 49
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 7;
    console.log(x + y); (a) Error (b) 9 (c) 27
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 5;
    console.log(x + y); (a) 25 (b) 7 (c) Error

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