JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 645 · 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 = "Zoya";
   console.log("Welcome, " + name + "!"); (a) Welcome, Zoya! (b) Welcome, name! (c) name (d) Zoya
2. 2.⚡ What number does this code print?
   let books = 29;
   books = books + 7;
   books = books - 28;
   console.log(books);
3. 3.⚡ What number does this code print?
   let coins = 6;
   coins = coins + 14;
   coins = coins - 12;
   console.log(coins);
4. 4.⚡ Which JavaScript word repeats code? (a) if (b) let (c) for (d) console.log()
5. 5.⚡ What does this code show?
   let name = "Zoya";
   alert("Hi, " + name + "!"); (a) Hi, Zoya! (b) Zoya (c) Hi, name! (d) name
6. 6.⚡ Which JavaScript word writes in the console? (a) if (b) alert() (c) console.log() (d) for
7. 7.⚡ What number does this code print?
   let a = 32;
   let b = 32;
   console.log(a + b);
8. 8.⚡ Which JavaScript word makes a new variable? (a) if (b) console.log() (c) let (d) for
9. 9.⚡ What does this code show?
   let name = "Meera";
   console.log("Well done, " + name + "!"); (a) Well done, Meera! (b) name (c) Meera (d) Well done, name!
10. 10.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Aman! (d) Aman
11. 11.⚡ What number does this code print?
    let a = 59;
    let b = 10;
    console.log(a + b);
12. 12.⚡ What number does this code print?
    let a = 6;
    let b = 26;
    console.log(a + b);
13. 13.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <script> (c) <code> (d) <js>
14. 14.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a new tab (d) a picture
15. 15.⚡ Which JavaScript word shows a pop-up box? (a) let (b) alert() (c) console.log() (d) for
16. 16.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) name (b) Hello, Aman! (c) Aman (d) Hello, name!
17. 17.⚡ What number does this code print?
    let a = 34;
    let b = 33;
    console.log(a + b);
18. 18.⚡ What number does this code print?
    let runs = 25;
    runs = runs + 18;
    runs = runs - 25;
    console.log(runs);
19. 19.⚡ What number does this code print?
    let a = 19;
    let b = 15;
    console.log(a + b);
20. 20.⚡ What number does this code print?
    let marks = 27;
    marks = marks + 13;
    marks = marks - 1;
    console.log(marks);
21. 21.⚡ What number does this code print?
    let a = 11;
    let b = 7;
    console.log(a * b);
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 4;
    console.log(x + y); (a) Error (b) 54 (c) 9
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) Error (b) 5 (c) 23
24. 24.⚡ What number does this code print?
    let runs = 12;
    runs = runs + 8;
    runs = runs - 13;
    console.log(runs);
25. 25.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Hello, Arjun! (b) Hello, name! (c) name (d) Arjun
26. 26.⚡ 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
27. 27.⚡ What number does this code print?
    let apples = 22;
    apples = apples + 18;
    apples = apples - 26;
    console.log(apples);
28. 28.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) only colours (d) the page title
29. 29.⚡ What number does this code print?
    let marks = 16;
    marks = marks + 7;
    marks = marks - 11;
    console.log(marks);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 5;
    console.log(x + y); (a) 7 (b) Error (c) 25
31. 31.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Kabir! (c) Kabir (d) name
32. 32.⚡ 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
33. 33.⚡ What number does this code print?
    let books = 22;
    books = books + 6;
    books = books - 21;
    console.log(books);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 3;
    console.log(x + y); (a) 10 (b) Error (c) 73
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 8;
    console.log(x + y); (a) 16 (b) 88 (c) Error
36. 36.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Hi, Arjun! (b) name (c) Hi, name! (d) Arjun
37. 37.⚡ Which JavaScript word runs code when true? (a) if (b) alert() (c) let (d) console.log()
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 7;
    console.log(x + y); (a) Error (b) 97 (c) 16
39. 39.⚡ What number does this code print?
    let a = 43;
    let b = 30;
    console.log(a + b);
40. 40.⚡ Which word makes a new variable? (a) put (b) make (c) give (d) let

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