JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 631 · 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 does this code show?
   let name = "Arjun";
   console.log("Well done, " + name + "!"); (a) Well done, Arjun! (b) name (c) Arjun (d) Well done, name!
2. 2.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) actions and changes (d) the page title
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 2;
   console.log(x + y); (a) 52 (b) Error (c) 7
4. 4.⚡ Which JavaScript word makes a new variable? (a) alert() (b) if (c) console.log() (d) let
5. 5.⚡ What number does this code print?
   let a = 6;
   let b = 2;
   console.log(a * b);
6. 6.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <script> (d) <js>
7. 7.⚡ What number does this code print?
   let a = 55;
   let b = 35;
   console.log(a + b);
8. 8.⚡ What does this code show?
   let name = "Zoya";
   alert("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Zoya! (c) Zoya (d) name
9. 9.⚡ What number does this code print?
   let coins = 7;
   coins = coins + 15;
   coins = coins - 14;
   console.log(coins);
10. 10.⚡ What number does this code print?
    let a = 40;
    let b = 14;
    console.log(a + b);
11. 11.⚡ Which JavaScript word shows a pop-up box? (a) for (b) console.log() (c) let (d) alert()
12. 12.⚡ Which word makes a new variable? (a) make (b) give (c) let (d) put
13. 13.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Hi, Aman! (b) name (c) Aman (d) Hi, name!
14. 14.⚡ What number does this code print?
    let a = 12;
    let b = 23;
    console.log(a + b);
15. 15.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Meera! (c) Meera (d) name
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) Error (b) 9 (c) 81
17. 17.⚡ What number does this code print?
    let score = 17;
    score = score + 2;
    score = score - 3;
    console.log(score);
18. 18.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .js (d) .css
19. 19.⚡ Which JavaScript word writes in the console? (a) let (b) for (c) console.log() (d) alert()
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) Error (b) 5 (c) 23
21. 21.⚡ What number does this code print?
    let a = 2;
    let b = 12;
    console.log(a * b);
22. 22.⚡ What number does this code print?
    let marks = 20;
    marks = marks + 6;
    marks = marks - 11;
    console.log(marks);
23. 23.⚡ What number does this code print?
    let a = 18;
    let b = 13;
    console.log(a + b);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y); (a) Error (b) 6 (c) 51
25. 25.⚡ 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
26. 26.⚡ What does alert() show? (a) a picture (b) a pop-up box (c) a new tab (d) a table
27. 27.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Riya (b) name (c) Hello, name! (d) Hello, Riya!
28. 28.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 13;
    apples = apples - 3;
    console.log(apples);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 5;
    console.log(x + y); (a) 12 (b) 75 (c) Error
30. 30.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Meera (d) Welcome, Meera!
31. 31.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) name (b) Arjun (c) Hello, Arjun! (d) Hello, name!
32. 32.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Hi, Meera! (b) Meera (c) Hi, name! (d) name
33. 33.⚡ What number does this code print?
    let a = 11;
    let b = 26;
    console.log(a + b);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y); (a) Error (b) 62 (c) 8
35. 35.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Riya (c) Well done, Riya! (d) name
36. 36.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Aman (b) Well done, name! (c) Well done, Aman! (d) name
37. 37.⚡ What number does this code print?
    let apples = 20;
    apples = apples + 4;
    apples = apples - 23;
    console.log(apples);
38. 38.⚡ What number does this code print?
    let coins = 9;
    coins = coins + 20;
    coins = coins - 28;
    console.log(coins);
39. 39.⚡ What number does this code print?
    let books = 13;
    books = books + 7;
    books = books - 1;
    console.log(books);
40. 40.⚡ What number does this code print?
    let apples = 16;
    apples = apples + 15;
    apples = apples - 1;
    console.log(apples);

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