JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 288 · 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 JavaScript word repeats code? (a) let (b) for (c) if (d) alert()
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 5;
   console.log(x + y); (a) 95 (b) Error (c) 14
3. 3.⚡ Which JavaScript word writes in the console? (a) for (b) let (c) console.log() (d) alert()
4. 4.⚡ Which JavaScript word runs code when true? (a) alert() (b) for (c) if (d) console.log()
5. 5.⚡ Which word makes a new variable? (a) let (b) make (c) put (d) give
6. 6.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <code> (c) <js> (d) <style>
7. 7.⚡ What does this code show?
   let name = "Aman";
   console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Aman! (d) Aman
8. 8.⚡ What does this code show?
   let name = "Zoya";
   alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Zoya (c) name (d) Welcome, Zoya!
9. 9.⚡ What number does this code print?
   let score = 21;
   score = score + 3;
   score = score - 18;
   console.log(score);
10. 10.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Zoya! (c) Zoya (d) Welcome, name!
11. 11.⚡ Which JavaScript word shows a pop-up box? (a) for (b) let (c) console.log() (d) alert()
12. 12.⚡ What number does this code print?
    let a = 19;
    let b = 33;
    console.log(a + b);
13. 13.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .css (d) .js
14. 14.⚡ Where does console.log() show its output? (a) on the title bar (b) in the address bar (c) in the console (d) on the printer
15. 15.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Kabir (b) Well done, Kabir! (c) name (d) Well done, name!
16. 16.⚡ What number does this code print?
    let books = 12;
    books = books + 11;
    books = books - 23;
    console.log(books);
17. 17.⚡ Which JavaScript word makes a new variable? (a) if (b) for (c) let (d) console.log()
18. 18.⚡ 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
19. 19.⚡ What does alert() show? (a) a picture (b) a new tab (c) a pop-up box (d) a table
20. 20.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) only colours (d) the page title
21. 21.⚡ What number does this code print?
    let a = 44;
    let b = 36;
    console.log(a - b);
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 4;
    console.log(x + y); (a) Error (b) 74 (c) 11
23. 23.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Well done, Meera! (b) Well done, name! (c) Meera (d) name
24. 24.⚡ What number does this code print?
    let a = 38;
    let b = 3;
    console.log(a - b);
25. 25.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, Zoya! (c) Well done, name! (d) Zoya
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 5;
    console.log(x + y); (a) 25 (b) Error (c) 7
27. 27.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 16;
    apples = apples - 6;
    console.log(apples);
28. 28.⚡ What number does this code print?
    let books = 13;
    books = books + 3;
    books = books - 1;
    console.log(books);
29. 29.⚡ What number does this code print?
    let score = 9;
    score = score + 4;
    score = score - 5;
    console.log(score);
30. 30.⚡ 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
31. 31.⚡ What number does this code print?
    let coins = 17;
    coins = coins + 4;
    coins = coins - 14;
    console.log(coins);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 5;
    console.log(x + y); (a) Error (b) 75 (c) 12
33. 33.⚡ What number does this code print?
    let apples = 6;
    apples = apples + 3;
    apples = apples - 9;
    console.log(apples);
34. 34.⚡ What number does this code print?
    let a = 9;
    let b = 7;
    console.log(a - b);
35. 35.⚡ What number does this code print?
    let books = 9;
    books = books + 17;
    books = books - 7;
    console.log(books);
36. 36.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Arjun (c) name (d) Well done, Arjun!
37. 37.⚡ What number does this code print?
    let apples = 29;
    apples = apples + 4;
    apples = apples - 9;
    console.log(apples);
38. 38.⚡ What number does this code print?
    let a = 37;
    let b = 14;
    console.log(a - b);
39. 39.⚡ What number does this code print?
    let coins = 9;
    coins = coins + 3;
    coins = coins - 3;
    console.log(coins);
40. 40.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Riya (b) Hello, name! (c) name (d) Hello, Riya!

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