JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 774 · 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) let (b) console.log() (c) for (d) alert()
2. 2.⚡ Which JavaScript word runs code when true? (a) console.log() (b) if (c) alert() (d) let
3. 3.⚡ What number does this code print?
   let a = 8;
   let b = 8;
   console.log(a * b);
4. 4.⚡ Where does console.log() show its output? (a) in the address bar (b) on the printer (c) in the console (d) on the title bar
5. 5.⚡ What does this code show?
   let name = "Arjun";
   console.log("Hello, " + name + "!"); (a) name (b) Arjun (c) Hello, Arjun! (d) Hello, name!
6. 6.⚡ What number does this code print?
   let marks = 15;
   marks = marks + 13;
   marks = marks - 9;
   console.log(marks);
7. 7.⚡ What does this code show?
   let name = "Kabir";
   alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Kabir! (c) name (d) Kabir
8. 8.⚡ What number does this code print?
   let a = 16;
   let b = 35;
   console.log(a + b);
9. 9.⚡ What number does this code print?
   let coins = 29;
   coins = coins + 12;
   coins = coins - 1;
   console.log(coins);
10. 10.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <style> (c) <code> (d) <js>
11. 11.⚡ What number does this code print?
    let apples = 21;
    apples = apples + 8;
    apples = apples - 16;
    console.log(apples);
12. 12.⚡ What number does this code print?
    let a = 12;
    let b = 2;
    console.log(a * b);
13. 13.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Well done, Kabir! (b) name (c) Well done, name! (d) Kabir
14. 14.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the page title (c) the domain name (d) only colours
15. 15.⚡ What does alert() show? (a) a picture (b) a table (c) a pop-up box (d) a new tab
16. 16.⚡ What number does this code print?
    let a = 32;
    let b = 16;
    console.log(a - b);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 6;
    console.log(x + y); (a) 26 (b) Error (c) 8
18. 18.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Riya (b) name (c) Hello, Riya! (d) Hello, name!
19. 19.⚡ Which JavaScript word repeats code? (a) if (b) console.log() (c) alert() (d) for
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 7;
    console.log(x + y); (a) 37 (b) 10 (c) Error
21. 21.⚡ What number does this code print?
    let a = 52;
    let b = 34;
    console.log(a + b);
22. 22.⚡ Which JavaScript word shows a pop-up box? (a) let (b) console.log() (c) if (d) alert()
23. 23.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Aman! (c) Aman (d) name
24. 24.⚡ What number does this code print?
    let score = 14;
    score = score + 6;
    score = score - 18;
    console.log(score);
25. 25.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .jpg (c) .html (d) .css
26. 26.⚡ What number does this code print?
    let a = 11;
    let b = 37;
    console.log(a + b);
27. 27.⚡ What number does this code print?
    let marks = 20;
    marks = marks + 10;
    marks = marks - 8;
    console.log(marks);
28. 28.⚡ What number does this code print?
    let coins = 13;
    coins = coins + 3;
    coins = coins - 6;
    console.log(coins);
29. 29.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Meera (c) name (d) Welcome, Meera!
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 3;
    console.log(x + y); (a) 53 (b) 8 (c) Error
31. 31.⚡ What number does this code print?
    let score = 17;
    score = score + 7;
    score = score - 2;
    console.log(score);
32. 32.⚡ What number does this code print?
    let a = 4;
    let b = 12;
    console.log(a * b);
33. 33.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Meera! (c) Meera (d) name
34. 34.⚡ What number does this code print?
    let apples = 11;
    apples = apples + 7;
    apples = apples - 6;
    console.log(apples);
35. 35.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Kabir! (c) name (d) Kabir
36. 36.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, Riya! (b) Welcome, name! (c) Riya (d) name
37. 37.⚡ What number does this code print?
    let a = 9;
    let b = 5;
    console.log(a * b);
38. 38.⚡ What number does this code print?
    let books = 6;
    books = books + 11;
    books = books - 9;
    console.log(books);
39. 39.⚡ Which word makes a new variable? (a) make (b) let (c) put (d) give
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 7;
    console.log(x + y); (a) 97 (b) Error (c) 16

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