JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 998 · 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 = "1";
   let y = 2;
   console.log(x + y); (a) Error (b) 12 (c) 3
2. 2.⚡ What does this code show?
   let name = "Aman";
   alert("Hello, " + name + "!"); (a) name (b) Hello, Aman! (c) Hello, name! (d) Aman
3. 3.⚡ What does this code show?
   let name = "Arjun";
   console.log("Hello, " + name + "!"); (a) Arjun (b) Hello, Arjun! (c) name (d) Hello, name!
4. 4.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) only colours (d) the domain name
5. 5.⚡ What number does this code print?
   let a = 12;
   let b = 11;
   console.log(a * b);
6. 6.⚡ Which JavaScript word repeats code? (a) if (b) let (c) console.log() (d) for
7. 7.⚡ Where does console.log() show its output? (a) on the title bar (b) in the address bar (c) in the console (d) on the printer
8. 8.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) for (c) let (d) alert()
9. 9.⚡ What number does this code print?
   let apples = 27;
   apples = apples + 13;
   apples = apples - 9;
   console.log(apples);
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) 6 (b) 33 (c) Error
11. 11.⚡ Which JavaScript word runs code when true? (a) alert() (b) console.log() (c) if (d) for
12. 12.⚡ What does alert() show? (a) a pop-up box (b) a new tab (c) a picture (d) a table
13. 13.⚡ Which JavaScript word writes in the console? (a) alert() (b) console.log() (c) if (d) let
14. 14.⚡ What number does this code print?
    let a = 25;
    let b = 19;
    console.log(a - b);
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 4;
    console.log(x + y); (a) Error (b) 24 (c) 6
16. 16.⚡ What number does this code print?
    let a = 6;
    let b = 3;
    console.log(a * b);
17. 17.⚡ What number does this code print?
    let score = 14;
    score = score + 14;
    score = score - 4;
    console.log(score);
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 7;
    console.log(x + y); (a) Error (b) 15 (c) 87
19. 19.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Meera (c) Welcome, Meera! (d) name
20. 20.⚡ Which JavaScript word makes a new variable? (a) let (b) for (c) console.log() (d) if
21. 21.⚡ What number does this code print?
    let runs = 28;
    runs = runs + 5;
    runs = runs - 8;
    console.log(runs);
22. 22.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, Riya! (b) Hello, name! (c) name (d) Riya
23. 23.⚡ Which word makes a new variable? (a) give (b) let (c) put (d) make
24. 24.⚡ What number does this code print?
    let a = 6;
    let b = 5;
    console.log(a * b);
25. 25.⚡ What number does this code print?
    let books = 23;
    books = books + 17;
    books = books - 29;
    console.log(books);
26. 26.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <script> (c) <style> (d) <code>
27. 27.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .jpg (d) .js
28. 28.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Riya (b) name (c) Well done, name! (d) Well done, Riya!
29. 29.⚡ What number does this code print?
    let a = 59;
    let b = 1;
    console.log(a + b);
30. 30.⚡ What number does this code print?
    let apples = 20;
    apples = apples + 15;
    apples = apples - 22;
    console.log(apples);
31. 31.⚡ What number does this code print?
    let a = 23;
    let b = 23;
    console.log(a + b);
32. 32.⚡ What number does this code print?
    let a = 17;
    let b = 10;
    console.log(a - b);
33. 33.⚡ 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
34. 34.⚡ What number does this code print?
    let a = 5;
    let b = 6;
    console.log(a * b);
35. 35.⚡ What number does this code print?
    let a = 8;
    let b = 9;
    console.log(a + b);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 9;
    console.log(x + y); (a) 99 (b) Error (c) 18
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y); (a) 4 (b) 31 (c) Error
38. 38.⚡ What number does this code print?
    let a = 7;
    let b = 11;
    console.log(a + b);
39. 39.⚡ What number does this code print?
    let score = 9;
    score = score + 17;
    score = score - 13;
    console.log(score);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y); (a) 13 (b) Error (c) 67

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