JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 803 · 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) alert() (b) let (c) for (d) if
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 2;
   console.log(x + y); (a) 22 (b) 4 (c) Error
3. 3.⚡ Which JavaScript word writes in the console? (a) console.log() (b) if (c) for (d) alert()
4. 4.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .js (d) .css
5. 5.⚡ Which JavaScript word makes a new variable? (a) if (b) for (c) let (d) alert()
6. 6.⚡ What number does this code print?
   let a = 22;
   let b = 17;
   console.log(a + b);
7. 7.⚡ What does this code show?
   let name = "Meera";
   alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Meera! (d) Meera
8. 8.⚡ What does this code show?
   let name = "Kabir";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) Kabir (c) Hello, Kabir! (d) name
9. 9.⚡ Where does console.log() show its output? (a) in the console (b) on the title bar (c) in the address bar (d) on the printer
10. 10.⚡ Which JavaScript word runs code when true? (a) for (b) let (c) if (d) alert()
11. 11.⚡ What number does this code print?
    let a = 8;
    let b = 7;
    console.log(a * b);
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 7;
    console.log(x + y); (a) 16 (b) 97 (c) Error
13. 13.⚡ What number does this code print?
    let a = 11;
    let b = 14;
    console.log(a + b);
14. 14.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Aman (c) name (d) Hi, Aman!
15. 15.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Zoya (b) Well done, name! (c) Well done, Zoya! (d) name
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 6;
    console.log(x + y); (a) 96 (b) Error (c) 15
17. 17.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) name (b) Arjun (c) Hello, Arjun! (d) Hello, name!
18. 18.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <js> (d) <style>
19. 19.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) name (b) Arjun (c) Well done, name! (d) Well done, Arjun!
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y); (a) 8 (b) 62 (c) Error
21. 21.⚡ Which JavaScript word shows a pop-up box? (a) for (b) alert() (c) console.log() (d) if
22. 22.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, Zoya! (b) Zoya (c) name (d) Welcome, name!
23. 23.⚡ What number does this code print?
    let score = 20;
    score = score + 11;
    score = score - 31;
    console.log(score);
24. 24.⚡ What number does this code print?
    let marks = 28;
    marks = marks + 19;
    marks = marks - 25;
    console.log(marks);
25. 25.⚡ What number does this code print?
    let a = 21;
    let b = 19;
    console.log(a + b);
26. 26.⚡ What number does this code print?
    let a = 49;
    let b = 10;
    console.log(a - b);
27. 27.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the domain name (c) the page title (d) only colours
28. 28.⚡ What number does this code print?
    let score = 12;
    score = score + 14;
    score = score - 9;
    console.log(score);
29. 29.⚡ What number does this code print?
    let a = 37;
    let b = 16;
    console.log(a - b);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 6;
    console.log(x + y); (a) 66 (b) Error (c) 12
31. 31.⚡ What number does this code print?
    let a = 24;
    let b = 9;
    console.log(a + b);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) 43 (b) 7 (c) Error
33. 33.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) name (b) Hello, Riya! (c) Riya (d) Hello, name!
34. 34.⚡ What number does this code print?
    let a = 31;
    let b = 5;
    console.log(a - b);
35. 35.⚡ What number does this code print?
    let score = 10;
    score = score + 14;
    score = score - 8;
    console.log(score);
36. 36.⚡ Which word makes a new variable? (a) make (b) put (c) let (d) give
37. 37.⚡ What number does this code print?
    let apples = 12;
    apples = apples + 13;
    apples = apples - 25;
    console.log(apples);
38. 38.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) name (b) Aman (c) Well done, Aman! (d) Well done, name!
39. 39.⚡ What number does this code print?
    let books = 8;
    books = books + 20;
    books = books - 11;
    console.log(books);
40. 40.⚡ What number does this code print?
    let a = 25;
    let b = 8;
    console.log(a - b);

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