JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 328 · 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 = "2";
   let y = 4;
   console.log(x + y); (a) 24 (b) 6 (c) Error
2. 2.⚡ Which JavaScript word makes a new variable? (a) let (b) if (c) alert() (d) console.log()
3. 3.⚡ Which word makes a new variable? (a) put (b) let (c) give (d) make
4. 4.⚡ Which JavaScript word runs code when true? (a) alert() (b) if (c) for (d) console.log()
5. 5.⚡ What does this code show?
   let name = "Arjun";
   console.log("Hello, " + name + "!"); (a) Arjun (b) Hello, name! (c) Hello, Arjun! (d) name
6. 6.⚡ Which JavaScript word writes in the console? (a) alert() (b) for (c) console.log() (d) let
7. 7.⚡ What number does this code print?
   let runs = 26;
   runs = runs + 3;
   runs = runs - 9;
   console.log(runs);
8. 8.⚡ What does this code show?
   let name = "Kabir";
   alert("Well done, " + name + "!"); (a) Kabir (b) name (c) Well done, name! (d) Well done, Kabir!
9. 9.⚡ What number does this code print?
   let a = 12;
   let b = 4;
   console.log(a * b);
10. 10.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Arjun! (d) Arjun
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 5;
    console.log(x + y); (a) Error (b) 6 (c) 15
12. 12.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <code> (d) <style>
13. 13.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Hi, Arjun! (b) Hi, name! (c) Arjun (d) name
14. 14.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) actions and changes (d) the page title
15. 15.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Arjun (b) Well done, Arjun! (c) name (d) Well done, name!
16. 16.⚡ What number does this code print?
    let a = 10;
    let b = 2;
    console.log(a * b);
17. 17.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) name (b) Riya (c) Well done, name! (d) Well done, Riya!
18. 18.⚡ What number does this code print?
    let a = 47;
    let b = 2;
    console.log(a + b);
19. 19.⚡ What number does this code print?
    let books = 27;
    books = books + 10;
    books = books - 20;
    console.log(books);
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 7;
    console.log(x + y); (a) 12 (b) Error (c) 57
21. 21.⚡ What number does this code print?
    let a = 5;
    let b = 5;
    console.log(a * b);
22. 22.⚡ What number does this code print?
    let a = 55;
    let b = 7;
    console.log(a + b);
23. 23.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Zoya (b) Well done, name! (c) Well done, Zoya! (d) name
24. 24.⚡ What number does this code print?
    let marks = 28;
    marks = marks + 4;
    marks = marks - 4;
    console.log(marks);
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 6;
    console.log(x + y); (a) Error (b) 15 (c) 96
26. 26.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, Aman! (b) Hello, name! (c) name (d) Aman
27. 27.⚡ What number does this code print?
    let coins = 29;
    coins = coins + 20;
    coins = coins - 28;
    console.log(coins);
28. 28.⚡ What number does this code print?
    let score = 8;
    score = score + 16;
    score = score - 22;
    console.log(score);
29. 29.⚡ What number does this code print?
    let a = 21;
    let b = 6;
    console.log(a - b);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y); (a) 4 (b) 22 (c) Error
31. 31.⚡ What number does this code print?
    let coins = 7;
    coins = coins + 6;
    coins = coins - 10;
    console.log(coins);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) 4 (b) 13 (c) Error
33. 33.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Zoya! (d) Zoya
34. 34.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Riya! (c) name (d) Riya
35. 35.⚡ Which JavaScript word repeats code? (a) console.log() (b) if (c) for (d) let
36. 36.⚡ Where does console.log() show its output? (a) in the console (b) on the printer (c) on the title bar (d) in the address bar
37. 37.⚡ What does alert() show? (a) a new tab (b) a pop-up box (c) a table (d) a picture
38. 38.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Aman! (c) Welcome, name! (d) Aman
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 2;
    console.log(x + y); (a) Error (b) 92 (c) 11
40. 40.⚡ What number does this code print?
    let score = 16;
    score = score + 3;
    score = score - 4;
    console.log(score);

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