JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 693 · 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 = 7;
   let b = 6;
   console.log(a * b);
2. 2.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) console.log() (d) for
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 3;
   console.log(x + y); (a) 43 (b) Error (c) 7
4. 4.⚡ What number does this code print?
   let books = 22;
   books = books + 16;
   books = books - 33;
   console.log(books);
5. 5.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <script> (c) <code> (d) <js>
6. 6.⚡ Which word makes a new variable? (a) let (b) make (c) give (d) put
7. 7.⚡ Which JavaScript word writes in the console? (a) let (b) if (c) console.log() (d) for
8. 8.⚡ What number does this code print?
   let a = 12;
   let b = 4;
   console.log(a * b);
9. 9.⚡ What number does this code print?
   let a = 52;
   let b = 26;
   console.log(a + b);
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 2;
    console.log(x + y); (a) 92 (b) 11 (c) Error
11. 11.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a picture (d) a new tab
12. 12.⚡ What number does this code print?
    let books = 9;
    books = books + 5;
    books = books - 3;
    console.log(books);
13. 13.⚡ 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
14. 14.⚡ What number does this code print?
    let score = 10;
    score = score + 15;
    score = score - 18;
    console.log(score);
15. 15.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) actions and changes (d) only colours
16. 16.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Arjun (b) Hi, name! (c) Hi, Arjun! (d) name
17. 17.⚡ Which JavaScript word runs code when true? (a) alert() (b) let (c) console.log() (d) if
18. 18.⚡ What number does this code print?
    let a = 26;
    let b = 22;
    console.log(a - b);
19. 19.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Arjun! (d) Arjun
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 8;
    console.log(x + y); (a) 68 (b) Error (c) 14
21. 21.⚡ What number does this code print?
    let books = 17;
    books = books + 6;
    books = books - 21;
    console.log(books);
22. 22.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Well done, Riya! (d) Riya
23. 23.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Welcome, Aman! (b) name (c) Aman (d) Welcome, name!
24. 24.⚡ What number does this code print?
    let a = 57;
    let b = 17;
    console.log(a - b);
25. 25.⚡ What number does this code print?
    let a = 4;
    let b = 4;
    console.log(a * b);
26. 26.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Aman! (c) Aman (d) name
27. 27.⚡ What number does this code print?
    let apples = 19;
    apples = apples + 3;
    apples = apples - 14;
    console.log(apples);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y); (a) Error (b) 46 (c) 10
29. 29.⚡ What number does this code print?
    let a = 49;
    let b = 35;
    console.log(a - b);
30. 30.⚡ What number does this code print?
    let apples = 6;
    apples = apples + 6;
    apples = apples - 8;
    console.log(apples);
31. 31.⚡ What number does this code print?
    let a = 6;
    let b = 4;
    console.log(a * b);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 7;
    console.log(x + y); (a) 9 (b) 27 (c) Error
33. 33.⚡ What number does this code print?
    let apples = 16;
    apples = apples + 19;
    apples = apples - 2;
    console.log(apples);
34. 34.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .jpg (c) .css (d) .js
35. 35.⚡ What number does this code print?
    let a = 23;
    let b = 20;
    console.log(a - b);
36. 36.⚡ What number does this code print?
    let a = 3;
    let b = 4;
    console.log(a * b);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 1;
    console.log(x + y); (a) 8 (b) 71 (c) Error
38. 38.⚡ Which JavaScript word repeats code? (a) if (b) for (c) alert() (d) console.log()
39. 39.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) let (c) for (d) if
40. 40.⚡ What number does this code print?
    let a = 55;
    let b = 22;
    console.log(a + b);

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