JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 451 · 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 makes a new variable? (a) let (b) console.log() (c) alert() (d) for
2. 2.⚡ What does this code show?
   let name = "Aman";
   console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Aman (d) Well done, Aman!
3. 3.⚡ What number does this code print?
   let runs = 24;
   runs = runs + 16;
   runs = runs - 13;
   console.log(runs);
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 9;
   console.log(x + y); (a) Error (b) 13 (c) 49
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 8;
   console.log(x + y); (a) 88 (b) 16 (c) Error
6. 6.⚡ What does this code show?
   let name = "Zoya";
   console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Zoya (c) Welcome, Zoya! (d) name
7. 7.⚡ What number does this code print?
   let marks = 20;
   marks = marks + 19;
   marks = marks - 7;
   console.log(marks);
8. 8.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <js> (d) <script>
9. 9.⚡ What number does this code print?
   let a = 55;
   let b = 16;
   console.log(a + b);
10. 10.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Well done, Aman! (b) Aman (c) Well done, name! (d) name
11. 11.⚡ What number does this code print?
    let a = 9;
    let b = 6;
    console.log(a * b);
12. 12.⚡ Which JavaScript word writes in the console? (a) if (b) for (c) alert() (d) console.log()
13. 13.⚡ Where does console.log() show its output? (a) on the title bar (b) in the address bar (c) in the console (d) on the printer
14. 14.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) name (b) Aman (c) Hello, name! (d) Hello, Aman!
15. 15.⚡ Which JavaScript word repeats code? (a) if (b) console.log() (c) let (d) for
16. 16.⚡ What number does this code print?
    let marks = 16;
    marks = marks + 12;
    marks = marks - 5;
    console.log(marks);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 8;
    console.log(x + y); (a) 13 (b) Error (c) 58
18. 18.⚡ Which JavaScript word runs code when true? (a) for (b) if (c) alert() (d) let
19. 19.⚡ What number does this code print?
    let a = 58;
    let b = 29;
    console.log(a + b);
20. 20.⚡ What number does this code print?
    let score = 16;
    score = score + 10;
    score = score - 14;
    console.log(score);
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 9;
    console.log(x + y); (a) 12 (b) Error (c) 39
22. 22.⚡ What number does this code print?
    let marks = 5;
    marks = marks + 15;
    marks = marks - 3;
    console.log(marks);
23. 23.⚡ What number does this code print?
    let books = 18;
    books = books + 3;
    books = books - 8;
    console.log(books);
24. 24.⚡ What number does this code print?
    let a = 9;
    let b = 2;
    console.log(a * b);
25. 25.⚡ What number does this code print?
    let a = 38;
    let b = 26;
    console.log(a - b);
26. 26.⚡ What number does this code print?
    let coins = 9;
    coins = coins + 16;
    coins = coins - 6;
    console.log(coins);
27. 27.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Aman (b) Welcome, name! (c) Welcome, Aman! (d) name
28. 28.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Hello, Meera! (b) name (c) Meera (d) Hello, name!
29. 29.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, Riya! (b) Riya (c) name (d) Hi, name!
30. 30.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Meera! (c) Meera (d) name
31. 31.⚡ What number does this code print?
    let a = 4;
    let b = 5;
    console.log(a * b);
32. 32.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .jpg (d) .js
33. 33.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) actions and changes (d) the page title
34. 34.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Meera (b) Hi, name! (c) Hi, Meera! (d) name
35. 35.⚡ Which word makes a new variable? (a) put (b) give (c) let (d) make
36. 36.⚡ What number does this code print?
    let a = 8;
    let b = 2;
    console.log(a * b);
37. 37.⚡ What number does this code print?
    let runs = 25;
    runs = runs + 8;
    runs = runs - 27;
    console.log(runs);
38. 38.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Kabir (b) Well done, name! (c) Well done, Kabir! (d) name
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 8;
    console.log(x + y); (a) 14 (b) Error (c) 68
40. 40.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Zoya (b) Well done, name! (c) Well done, Zoya! (d) name

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