JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 248 · 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, name! (b) Zoya (c) name (d) Welcome, Zoya!
2. 2.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) console.log() (d) for
3. 3.⚡ Which JavaScript word repeats code? (a) for (b) alert() (c) let (d) if
4. 4.⚡ What does this code show?
   let name = "Aman";
   console.log("Well done, " + name + "!"); (a) name (b) Well done, Aman! (c) Well done, name! (d) Aman
5. 5.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) let (c) for (d) if
6. 6.⚡ 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
7. 7.⚡ What does alert() show? (a) a table (b) a picture (c) a new tab (d) a pop-up box
8. 8.⚡ Which word makes a new variable? (a) give (b) make (c) let (d) put
9. 9.⚡ What does this code show?
   let name = "Arjun";
   alert("Hello, " + name + "!"); (a) name (b) Arjun (c) Hello, name! (d) Hello, Arjun!
10. 10.⚡ What number does this code print?
    let a = 2;
    let b = 10;
    console.log(a * b);
11. 11.⚡ What number does this code print?
    let a = 18;
    let b = 11;
    console.log(a + b);
12. 12.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .js (d) .jpg
13. 13.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Aman! (c) name (d) Aman
14. 14.⚡ What does JavaScript add to a web page? (a) only colours (b) the page title (c) the domain name (d) actions and changes
15. 15.⚡ What number does this code print?
    let a = 43;
    let b = 27;
    console.log(a + b);
16. 16.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Riya (d) Welcome, Riya!
17. 17.⚡ What number does this code print?
    let a = 27;
    let b = 25;
    console.log(a - b);
18. 18.⚡ Which JavaScript word runs code when true? (a) let (b) if (c) for (d) alert()
19. 19.⚡ What number does this code print?
    let a = 3;
    let b = 5;
    console.log(a * b);
20. 20.⚡ What number does this code print?
    let books = 20;
    books = books + 3;
    books = books - 2;
    console.log(books);
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y); (a) 8 (b) Error (c) 44
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) Error (b) 9 (c) 72
23. 23.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <style> (d) <script>
24. 24.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) Kabir (b) Hi, name! (c) Hi, Kabir! (d) name
25. 25.⚡ What number does this code print?
    let a = 40;
    let b = 9;
    console.log(a + b);
26. 26.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Hello, Riya! (d) Riya
27. 27.⚡ What number does this code print?
    let books = 13;
    books = books + 16;
    books = books - 27;
    console.log(books);
28. 28.⚡ What number does this code print?
    let a = 60;
    let b = 31;
    console.log(a - b);
29. 29.⚡ What number does this code print?
    let a = 2;
    let b = 6;
    console.log(a * b);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 8;
    console.log(x + y); (a) Error (b) 98 (c) 17
31. 31.⚡ What number does this code print?
    let marks = 25;
    marks = marks + 9;
    marks = marks - 4;
    console.log(marks);
32. 32.⚡ What number does this code print?
    let a = 5;
    let b = 39;
    console.log(a + b);
33. 33.⚡ What number does this code print?
    let a = 5;
    let b = 5;
    console.log(a * b);
34. 34.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Hi, Arjun! (b) name (c) Hi, name! (d) Arjun
35. 35.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) name (b) Hi, Aman! (c) Hi, name! (d) Aman
36. 36.⚡ What number does this code print?
    let coins = 29;
    coins = coins + 8;
    coins = coins - 18;
    console.log(coins);
37. 37.⚡ What number does this code print?
    let a = 2;
    let b = 5;
    console.log(a * b);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 8;
    console.log(x + y); (a) 13 (b) Error (c) 58
39. 39.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) let (c) if (d) alert()
40. 40.⚡ What number does this code print?
    let a = 38;
    let b = 7;
    console.log(a + b);

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