JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 4 · 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 = "Meera";
   alert("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Meera! (c) name (d) Meera
2. 2.⚡ What does this code show?
   let name = "Arjun";
   alert("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Arjun! (c) Arjun (d) name
3. 3.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) for (c) let (d) console.log()
4. 4.⚡ What does alert() show? (a) a table (b) a new tab (c) a pop-up box (d) a picture
5. 5.⚡ Which JavaScript word makes a new variable? (a) let (b) for (c) console.log() (d) if
6. 6.⚡ What does this code show?
   let name = "Riya";
   alert("Hello, " + name + "!"); (a) name (b) Riya (c) Hello, Riya! (d) Hello, name!
7. 7.⚡ What number does this code print?
   let a = 58;
   let b = 7;
   console.log(a - b);
8. 8.⚡ What does this code show?
   let name = "Meera";
   alert("Welcome, " + name + "!"); (a) Welcome, Meera! (b) Meera (c) Welcome, name! (d) name
9. 9.⚡ What number does this code print?
   let score = 22;
   score = score + 4;
   score = score - 12;
   console.log(score);
10. 10.⚡ Which JavaScript word writes in the console? (a) for (b) console.log() (c) let (d) alert()
11. 11.⚡ What number does this code print?
    let a = 12;
    let b = 12;
    console.log(a * b);
12. 12.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .js (c) .css (d) .html
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 7;
    console.log(x + y); (a) 87 (b) Error (c) 15
14. 14.⚡ What number does this code print?
    let a = 29;
    let b = 20;
    console.log(a - b);
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 2;
    console.log(x + y); (a) 42 (b) 6 (c) Error
16. 16.⚡ What number does this code print?
    let a = 40;
    let b = 4;
    console.log(a + b);
17. 17.⚡ Which JavaScript word runs code when true? (a) if (b) let (c) alert() (d) for
18. 18.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) name (b) Riya (c) Hi, name! (d) Hi, Riya!
19. 19.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) Arjun (b) name (c) Welcome, name! (d) Welcome, Arjun!
20. 20.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Zoya (b) Hello, name! (c) name (d) Hello, Zoya!
21. 21.⚡ What number does this code print?
    let books = 10;
    books = books + 18;
    books = books - 20;
    console.log(books);
22. 22.⚡ What number does this code print?
    let books = 13;
    books = books + 2;
    books = books - 13;
    console.log(books);
23. 23.⚡ What number does this code print?
    let marks = 12;
    marks = marks + 3;
    marks = marks - 12;
    console.log(marks);
24. 24.⚡ What number does this code print?
    let a = 49;
    let b = 12;
    console.log(a + b);
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) 56 (b) Error (c) 11
26. 26.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <style> (c) <js> (d) <code>
27. 27.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Aman (c) Hello, Aman! (d) name
28. 28.⚡ What number does this code print?
    let a = 7;
    let b = 8;
    console.log(a * b);
29. 29.⚡ What number does this code print?
    let a = 27;
    let b = 29;
    console.log(a + b);
30. 30.⚡ What number does this code print?
    let books = 25;
    books = books + 8;
    books = books - 29;
    console.log(books);
31. 31.⚡ Which JavaScript word repeats code? (a) for (b) let (c) console.log() (d) if
32. 32.⚡ What number does this code print?
    let a = 4;
    let b = 12;
    console.log(a * b);
33. 33.⚡ What number does this code print?
    let score = 7;
    score = score + 7;
    score = score - 6;
    console.log(score);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) 5 (b) 41 (c) Error
35. 35.⚡ Where does console.log() show its output? (a) in the address bar (b) in the console (c) on the title bar (d) on the printer
36. 36.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Welcome, Kabir! (b) Welcome, name! (c) name (d) Kabir
37. 37.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Meera (b) Welcome, Meera! (c) name (d) Welcome, name!
38. 38.⚡ What number does this code print?
    let a = 30;
    let b = 8;
    console.log(a - b);
39. 39.⚡ What number does this code print?
    let a = 6;
    let b = 4;
    console.log(a * b);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 4;
    console.log(x + y); (a) 6 (b) Error (c) 24

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