JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 500 · 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 word makes a new variable? (a) make (b) let (c) put (d) give
2. 2.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <style> (c) <code> (d) <js>
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 2;
   console.log(x + y); (a) 92 (b) Error (c) 11
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 7;
   console.log(x + y); (a) 17 (b) 8 (c) Error
5. 5.⚡ Which JavaScript word makes a new variable? (a) let (b) if (c) console.log() (d) alert()
6. 6.⚡ Which JavaScript word writes in the console? (a) let (b) for (c) console.log() (d) if
7. 7.⚡ What does alert() show? (a) a table (b) a new tab (c) a pop-up box (d) a picture
8. 8.⚡ Which JavaScript word runs code when true? (a) let (b) if (c) for (d) console.log()
9. 9.⚡ Which JavaScript word repeats code? (a) if (b) let (c) alert() (d) for
10. 10.⚡ What number does this code print?
    let a = 56;
    let b = 29;
    console.log(a + b);
11. 11.⚡ What number does this code print?
    let runs = 12;
    runs = runs + 5;
    runs = runs - 2;
    console.log(runs);
12. 12.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Kabir (c) name (d) Hello, Kabir!
13. 13.⚡ What number does this code print?
    let score = 5;
    score = score + 2;
    score = score - 4;
    console.log(score);
14. 14.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) on the title bar (d) in the console
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 9;
    console.log(x + y); (a) Error (b) 10 (c) 19
16. 16.⚡ What number does this code print?
    let marks = 6;
    marks = marks + 3;
    marks = marks - 3;
    console.log(marks);
17. 17.⚡ What number does this code print?
    let marks = 5;
    marks = marks + 10;
    marks = marks - 5;
    console.log(marks);
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) 2 (b) Error (c) 11
19. 19.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) only colours (d) actions and changes
20. 20.⚡ What number does this code print?
    let score = 11;
    score = score + 3;
    score = score - 9;
    console.log(score);
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 4;
    console.log(x + y); (a) 5 (b) 14 (c) Error
22. 22.⚡ What number does this code print?
    let a = 16;
    let b = 2;
    console.log(a - b);
23. 23.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) name (b) Meera (c) Well done, Meera! (d) Well done, name!
24. 24.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) Kabir (b) name (c) Hi, Kabir! (d) Hi, name!
25. 25.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, Meera! (c) Hello, name! (d) Meera
26. 26.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) name (b) Aman (c) Welcome, name! (d) Welcome, Aman!
27. 27.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Kabir (c) Well done, Kabir! (d) name
28. 28.⚡ What number does this code print?
    let a = 7;
    let b = 8;
    console.log(a * b);
29. 29.⚡ 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
30. 30.⚡ What number does this code print?
    let books = 17;
    books = books + 4;
    books = books - 20;
    console.log(books);
31. 31.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Arjun (b) Hi, name! (c) name (d) Hi, Arjun!
32. 32.⚡ What number does this code print?
    let a = 10;
    let b = 3;
    console.log(a * b);
33. 33.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Meera (b) name (c) Welcome, Meera! (d) Welcome, name!
34. 34.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) alert() (c) let (d) for
35. 35.⚡ What number does this code print?
    let runs = 8;
    runs = runs + 4;
    runs = runs - 8;
    console.log(runs);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y); (a) Error (b) 22 (c) 4
37. 37.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Well done, Aman! (b) Well done, name! (c) name (d) Aman
38. 38.⚡ What number does this code print?
    let a = 52;
    let b = 28;
    console.log(a - b);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 2;
    console.log(x + y); (a) 6 (b) Error (c) 42
40. 40.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, Riya! (b) Hi, name! (c) name (d) Riya

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