JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 280 · 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 = "Kabir";
   console.log("Hello, " + name + "!"); (a) Hello, Kabir! (b) Kabir (c) name (d) Hello, name!
2. 2.⚡ What number does this code print?
   let a = 5;
   let b = 10;
   console.log(a * b);
3. 3.⚡ Which JavaScript word shows a pop-up box? (a) let (b) console.log() (c) alert() (d) for
4. 4.⚡ 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
5. 5.⚡ Which JavaScript word repeats code? (a) for (b) let (c) console.log() (d) if
6. 6.⚡ What number does this code print?
   let books = 26;
   books = books + 6;
   books = books - 1;
   console.log(books);
7. 7.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) only colours (d) the domain name
8. 8.⚡ What number does this code print?
   let runs = 18;
   runs = runs + 18;
   runs = runs - 16;
   console.log(runs);
9. 9.⚡ Which word makes a new variable? (a) let (b) give (c) make (d) put
10. 10.⚡ What number does this code print?
    let a = 16;
    let b = 5;
    console.log(a - b);
11. 11.⚡ Which JavaScript word writes in the console? (a) alert() (b) if (c) console.log() (d) let
12. 12.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .js (c) .css (d) .html
13. 13.⚡ What does alert() show? (a) a picture (b) a table (c) a pop-up box (d) a new tab
14. 14.⚡ Which JavaScript word runs code when true? (a) console.log() (b) if (c) let (d) alert()
15. 15.⚡ What number does this code print?
    let score = 19;
    score = score + 5;
    score = score - 20;
    console.log(score);
16. 16.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Riya (b) Well done, Riya! (c) name (d) Well done, name!
17. 17.⚡ 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
18. 18.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Kabir! (d) Kabir
19. 19.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Riya! (c) name (d) Riya
20. 20.⚡ What number does this code print?
    let a = 56;
    let b = 40;
    console.log(a + b);
21. 21.⚡ What number does this code print?
    let a = 57;
    let b = 15;
    console.log(a + b);
22. 22.⚡ What number does this code print?
    let apples = 19;
    apples = apples + 9;
    apples = apples - 21;
    console.log(apples);
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 9;
    console.log(x + y); (a) Error (b) 49 (c) 13
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 7;
    console.log(x + y); (a) Error (b) 16 (c) 97
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) Error (b) 7 (c) 43
26. 26.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) name (b) Zoya (c) Hello, name! (d) Hello, Zoya!
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 5;
    console.log(x + y); (a) 10 (b) 55 (c) Error
28. 28.⚡ What number does this code print?
    let a = 16;
    let b = 4;
    console.log(a - b);
29. 29.⚡ Which JavaScript word makes a new variable? (a) for (b) let (c) if (d) console.log()
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 4;
    console.log(x + y); (a) 74 (b) 11 (c) Error
31. 31.⚡ What number does this code print?
    let a = 4;
    let b = 9;
    console.log(a * b);
32. 32.⚡ What number does this code print?
    let score = 18;
    score = score + 16;
    score = score - 13;
    console.log(score);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) 32 (b) Error (c) 5
34. 34.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Welcome, Meera! (b) Meera (c) Welcome, name! (d) name
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y); (a) 4 (b) Error (c) 31
36. 36.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Arjun (d) Hi, Arjun!
37. 37.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <script> (d) <code>
38. 38.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Riya (b) name (c) Hello, name! (d) Hello, Riya!
39. 39.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Zoya! (d) Zoya
40. 40.⚡ What number does this code print?
    let a = 7;
    let b = 10;
    console.log(a * b);

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