JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 913 · 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 writes in the console? (a) console.log() (b) for (c) let (d) if
2. 2.⚡ What does JavaScript add to a web page? (a) actions and changes (b) only colours (c) the domain name (d) the page title
3. 3.⚡ What does this code show?
   let name = "Aman";
   alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Aman (d) Hi, Aman!
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 4;
   console.log(x + y); (a) 24 (b) Error (c) 6
5. 5.⚡ Which JavaScript word runs code when true? (a) if (b) let (c) alert() (d) for
6. 6.⚡ Where does console.log() show its output? (a) in the console (b) in the address bar (c) on the printer (d) on the title bar
7. 7.⚡ What number does this code print?
   let apples = 25;
   apples = apples + 4;
   apples = apples - 22;
   console.log(apples);
8. 8.⚡ Which JavaScript word makes a new variable? (a) let (b) console.log() (c) for (d) if
9. 9.⚡ What does this code show?
   let name = "Zoya";
   alert("Hello, " + name + "!"); (a) name (b) Hello, Zoya! (c) Zoya (d) Hello, name!
10. 10.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .css (d) .jpg
11. 11.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) for (c) let (d) if
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 8;
    console.log(x + y); (a) 48 (b) 12 (c) Error
13. 13.⚡ What number does this code print?
    let a = 26;
    let b = 4;
    console.log(a + b);
14. 14.⚡ What number does this code print?
    let a = 14;
    let b = 25;
    console.log(a + b);
15. 15.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <style> (c) <code> (d) <js>
16. 16.⚡ Which JavaScript word repeats code? (a) if (b) alert() (c) for (d) console.log()
17. 17.⚡ What number does this code print?
    let a = 50;
    let b = 10;
    console.log(a + b);
18. 18.⚡ What number does this code print?
    let books = 29;
    books = books + 15;
    books = books - 20;
    console.log(books);
19. 19.⚡ What number does this code print?
    let a = 21;
    let b = 12;
    console.log(a + b);
20. 20.⚡ Which word makes a new variable? (a) let (b) make (c) put (d) give
21. 21.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Aman (b) Hello, Aman! (c) name (d) Hello, name!
22. 22.⚡ What number does this code print?
    let a = 7;
    let b = 7;
    console.log(a * b);
23. 23.⚡ What number does this code print?
    let a = 11;
    let b = 4;
    console.log(a * b);
24. 24.⚡ What does alert() show? (a) a picture (b) a table (c) a pop-up box (d) a new tab
25. 25.⚡ What number does this code print?
    let a = 43;
    let b = 11;
    console.log(a - b);
26. 26.⚡ What number does this code print?
    let runs = 21;
    runs = runs + 11;
    runs = runs - 15;
    console.log(runs);
27. 27.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Meera (c) Hello, Meera! (d) name
28. 28.⚡ What number does this code print?
    let apples = 19;
    apples = apples + 12;
    apples = apples - 31;
    console.log(apples);
29. 29.⚡ What number does this code print?
    let a = 8;
    let b = 2;
    console.log(a * b);
30. 30.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) Kabir (b) Welcome, name! (c) name (d) Welcome, Kabir!
31. 31.⚡ What number does this code print?
    let books = 13;
    books = books + 10;
    books = books - 13;
    console.log(books);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) 8 (b) 35 (c) Error
33. 33.⚡ What number does this code print?
    let a = 43;
    let b = 34;
    console.log(a + b);
34. 34.⚡ What number does this code print?
    let a = 56;
    let b = 20;
    console.log(a + b);
35. 35.⚡ What number does this code print?
    let a = 13;
    let b = 9;
    console.log(a + b);
36. 36.⚡ What number does this code print?
    let a = 35;
    let b = 8;
    console.log(a + b);
37. 37.⚡ What number does this code print?
    let a = 11;
    let b = 9;
    console.log(a * b);
38. 38.⚡ What number does this code print?
    let a = 7;
    let b = 33;
    console.log(a + b);
39. 39.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, Riya! (b) name (c) Riya (d) Well done, name!
40. 40.⚡ What number does this code print?
    let runs = 24;
    runs = runs + 18;
    runs = runs - 37;
    console.log(runs);

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