JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 226 · 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 number does this code print?
   let a = 33;
   let b = 14;
   console.log(a - b);
2. 2.⚡ What number does this code print?
   let score = 7;
   score = score + 2;
   score = score - 8;
   console.log(score);
3. 3.⚡ Which JavaScript word writes in the console? (a) for (b) let (c) console.log() (d) alert()
4. 4.⚡ What number does this code print?
   let a = 5;
   let b = 11;
   console.log(a * b);
5. 5.⚡ Which JavaScript word repeats code? (a) if (b) alert() (c) for (d) console.log()
6. 6.⚡ What number does this code print?
   let a = 53;
   let b = 40;
   console.log(a + b);
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 8;
   console.log(x + y); (a) Error (b) 68 (c) 14
8. 8.⚡ What number does this code print?
   let apples = 7;
   apples = apples + 14;
   apples = apples - 13;
   console.log(apples);
9. 9.⚡ What number does this code print?
   let a = 58;
   let b = 4;
   console.log(a - b);
10. 10.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) only colours (d) the domain name
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 9;
    console.log(x + y); (a) Error (b) 15 (c) 69
12. 12.⚡ Which JavaScript word makes a new variable? (a) alert() (b) let (c) for (d) if
13. 13.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <code> (d) <script>
14. 14.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, Riya! (c) Hello, name! (d) Riya
15. 15.⚡ What number does this code print?
    let books = 26;
    books = books + 10;
    books = books - 6;
    console.log(books);
16. 16.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Hello, Aman! (b) name (c) Hello, name! (d) Aman
17. 17.⚡ What number does this code print?
    let score = 26;
    score = score + 3;
    score = score - 2;
    console.log(score);
18. 18.⚡ What number does this code print?
    let apples = 8;
    apples = apples + 17;
    apples = apples - 16;
    console.log(apples);
19. 19.⚡ Which JavaScript word shows a pop-up box? (a) if (b) let (c) alert() (d) console.log()
20. 20.⚡ Where does console.log() show its output? (a) in the console (b) in the address bar (c) on the title bar (d) on the printer
21. 21.⚡ What number does this code print?
    let a = 38;
    let b = 20;
    console.log(a - b);
22. 22.⚡ Which JavaScript word runs code when true? (a) alert() (b) console.log() (c) let (d) if
23. 23.⚡ What does alert() show? (a) a picture (b) a table (c) a pop-up box (d) a new tab
24. 24.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Aman (b) Hi, name! (c) name (d) Hi, Aman!
25. 25.⚡ What number does this code print?
    let coins = 12;
    coins = coins + 4;
    coins = coins - 15;
    console.log(coins);
26. 26.⚡ What number does this code print?
    let a = 51;
    let b = 18;
    console.log(a - b);
27. 27.⚡ What number does this code print?
    let a = 50;
    let b = 10;
    console.log(a - b);
28. 28.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, Zoya! (c) Zoya (d) Hi, name!
29. 29.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Kabir (c) Hi, Kabir! (d) name
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 3;
    console.log(x + y); (a) 8 (b) 53 (c) Error
31. 31.⚡ Which word makes a new variable? (a) give (b) let (c) make (d) put
32. 32.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) name (b) Riya (c) Hello, Riya! (d) Hello, name!
33. 33.⚡ What number does this code print?
    let a = 56;
    let b = 14;
    console.log(a - b);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) 11 (b) 2 (c) Error
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 9;
    console.log(x + y); (a) 39 (b) 12 (c) Error
36. 36.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) Well done, Meera! (b) Meera (c) Well done, name! (d) name
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 2;
    console.log(x + y); (a) 6 (b) 42 (c) Error
38. 38.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Meera (b) name (c) Hello, Meera! (d) Hello, name!
39. 39.⚡ What number does this code print?
    let a = 24;
    let b = 24;
    console.log(a + b);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 4;
    console.log(x + y); (a) 6 (b) 24 (c) Error

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