JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 108 · 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) name (b) Well done, Meera! (c) Well done, name! (d) Meera
2. 2.⚡ What does this code show?
   let name = "Zoya";
   alert("Well done, " + name + "!"); (a) Well done, Zoya! (b) name (c) Zoya (d) Well done, name!
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 8;
   console.log(x + y); (a) 17 (b) Error (c) 98
4. 4.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <code> (c) <style> (d) <js>
5. 5.⚡ What does this code show?
   let name = "Riya";
   console.log("Well done, " + name + "!"); (a) Well done, Riya! (b) Well done, name! (c) Riya (d) name
6. 6.⚡ What does this code show?
   let name = "Kabir";
   console.log("Welcome, " + name + "!"); (a) Kabir (b) name (c) Welcome, Kabir! (d) Welcome, name!
7. 7.⚡ What number does this code print?
   let a = 4;
   let b = 2;
   console.log(a * b);
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 9;
   console.log(x + y); (a) 13 (b) 49 (c) Error
9. 9.⚡ What does this code show?
   let name = "Riya";
   console.log("Hi, " + name + "!"); (a) name (b) Riya (c) Hi, name! (d) Hi, Riya!
10. 10.⚡ What number does this code print?
    let a = 57;
    let b = 11;
    console.log(a + b);
11. 11.⚡ What number does this code print?
    let a = 24;
    let b = 11;
    console.log(a - b);
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) Error (b) 9 (c) 81
13. 13.⚡ Which JavaScript word shows a pop-up box? (a) let (b) alert() (c) for (d) console.log()
14. 14.⚡ What number does this code print?
    let score = 10;
    score = score + 16;
    score = score - 12;
    console.log(score);
15. 15.⚡ What number does this code print?
    let score = 15;
    score = score + 14;
    score = score - 13;
    console.log(score);
16. 16.⚡ Which word makes a new variable? (a) make (b) let (c) put (d) give
17. 17.⚡ What number does this code print?
    let a = 20;
    let b = 10;
    console.log(a + b);
18. 18.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, Kabir! (c) Kabir (d) Hello, name!
19. 19.⚡ Where does console.log() show its output? (a) in the console (b) on the title bar (c) on the printer (d) in the address bar
20. 20.⚡ Which JavaScript word runs code when true? (a) for (b) alert() (c) let (d) if
21. 21.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) the page title (d) only colours
22. 22.⚡ What number does this code print?
    let apples = 9;
    apples = apples + 11;
    apples = apples - 20;
    console.log(apples);
23. 23.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Welcome, Riya! (b) Riya (c) name (d) Welcome, name!
24. 24.⚡ Which JavaScript word makes a new variable? (a) alert() (b) console.log() (c) let (d) for
25. 25.⚡ What number does this code print?
    let a = 28;
    let b = 5;
    console.log(a - b);
26. 26.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) name (b) Zoya (c) Hi, Zoya! (d) Hi, name!
27. 27.⚡ What number does this code print?
    let a = 57;
    let b = 8;
    console.log(a - b);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) Error (b) 56 (c) 11
29. 29.⚡ What number does this code print?
    let score = 23;
    score = score + 11;
    score = score - 17;
    console.log(score);
30. 30.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) Kabir (b) name (c) Welcome, name! (d) Welcome, Kabir!
31. 31.⚡ What number does this code print?
    let books = 15;
    books = books + 19;
    books = books - 6;
    console.log(books);
32. 32.⚡ What number does this code print?
    let a = 38;
    let b = 20;
    console.log(a + b);
33. 33.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Kabir (b) name (c) Well done, name! (d) Well done, Kabir!
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 7;
    console.log(x + y); (a) 47 (b) 11 (c) Error
35. 35.⚡ What number does this code print?
    let books = 7;
    books = books + 8;
    books = books - 10;
    console.log(books);
36. 36.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, Arjun! (c) Welcome, name! (d) Arjun
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y); (a) 8 (b) 62 (c) Error
38. 38.⚡ What number does this code print?
    let a = 25;
    let b = 4;
    console.log(a + b);
39. 39.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Riya (b) Hello, Riya! (c) Hello, name! (d) name
40. 40.⚡ What number does this code print?
    let a = 39;
    let b = 32;
    console.log(a + b);

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