JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 82 · 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.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .css (c) .js (d) .html
2. 2.⚡ Which word makes a new variable? (a) let (b) make (c) put (d) give
3. 3.⚡ Which JavaScript word makes a new variable? (a) alert() (b) if (c) let (d) console.log()
4. 4.⚡ What does this code show?
   let name = "Arjun";
   console.log("Well done, " + name + "!"); (a) Well done, Arjun! (b) Well done, name! (c) Arjun (d) name
5. 5.⚡ What does alert() show? (a) a picture (b) a pop-up box (c) a table (d) a new tab
6. 6.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) let (d) console.log()
7. 7.⚡ What number does this code print?
   let a = 36;
   let b = 27;
   console.log(a + b);
8. 8.⚡ What number does this code print?
   let marks = 23;
   marks = marks + 15;
   marks = marks - 22;
   console.log(marks);
9. 9.⚡ What does this code show?
   let name = "Riya";
   alert("Hello, " + name + "!"); (a) name (b) Riya (c) Hello, name! (d) Hello, Riya!
10. 10.⚡ What number does this code print?
    let a = 48;
    let b = 13;
    console.log(a + b);
11. 11.⚡ Which JavaScript word repeats code? (a) for (b) console.log() (c) let (d) if
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y); (a) 6 (b) 51 (c) Error
13. 13.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Aman (b) name (c) Hello, name! (d) Hello, Aman!
14. 14.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) only colours (d) the domain name
15. 15.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Meera! (d) Meera
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 9;
    console.log(x + y); (a) 29 (b) 11 (c) Error
17. 17.⚡ What number does this code print?
    let a = 8;
    let b = 2;
    console.log(a * b);
18. 18.⚡ What number does this code print?
    let score = 26;
    score = score + 18;
    score = score - 20;
    console.log(score);
19. 19.⚡ What number does this code print?
    let a = 38;
    let b = 36;
    console.log(a - b);
20. 20.⚡ What number does this code print?
    let a = 9;
    let b = 19;
    console.log(a + b);
21. 21.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Arjun (b) Well done, name! (c) name (d) Well done, Arjun!
22. 22.⚡ What number does this code print?
    let marks = 29;
    marks = marks + 9;
    marks = marks - 19;
    console.log(marks);
23. 23.⚡ What number does this code print?
    let marks = 20;
    marks = marks + 2;
    marks = marks - 9;
    console.log(marks);
24. 24.⚡ What number does this code print?
    let score = 10;
    score = score + 20;
    score = score - 2;
    console.log(score);
25. 25.⚡ What number does this code print?
    let a = 56;
    let b = 38;
    console.log(a + b);
26. 26.⚡ What number does this code print?
    let a = 11;
    let b = 5;
    console.log(a * b);
27. 27.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Aman! (d) Aman
28. 28.⚡ Which JavaScript word writes in the console? (a) for (b) let (c) console.log() (d) alert()
29. 29.⚡ What number does this code print?
    let a = 12;
    let b = 19;
    console.log(a + b);
30. 30.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Hello, Meera! (b) Meera (c) Hello, name! (d) name
31. 31.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the console (d) in the address bar
32. 32.⚡ Which JavaScript word runs code when true? (a) console.log() (b) if (c) alert() (d) let
33. 33.⚡ What number does this code print?
    let runs = 24;
    runs = runs + 2;
    runs = runs - 2;
    console.log(runs);
34. 34.⚡ What number does this code print?
    let a = 31;
    let b = 32;
    console.log(a + b);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 4;
    console.log(x + y); (a) 64 (b) 10 (c) Error
36. 36.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <js> (d) <script>
37. 37.⚡ What number does this code print?
    let a = 4;
    let b = 7;
    console.log(a * b);
38. 38.⚡ What number does this code print?
    let marks = 30;
    marks = marks + 16;
    marks = marks - 26;
    console.log(marks);
39. 39.⚡ What number does this code print?
    let coins = 21;
    coins = coins + 11;
    coins = coins - 5;
    console.log(coins);
40. 40.⚡ What number does this code print?
    let a = 31;
    let b = 31;
    console.log(a + b);

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