JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 130 · 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) if (b) for (c) alert() (d) console.log()
2. 2.⚡ What does this code show?
   let name = "Riya";
   alert("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Riya (d) Welcome, Riya!
3. 3.⚡ What does this code show?
   let name = "Riya";
   alert("Hi, " + name + "!"); (a) Hi, Riya! (b) name (c) Hi, name! (d) Riya
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 2;
   console.log(x + y); (a) Error (b) 22 (c) 4
5. 5.⚡ What number does this code print?
   let marks = 7;
   marks = marks + 20;
   marks = marks - 5;
   console.log(marks);
6. 6.⚡ What number does this code print?
   let a = 15;
   let b = 1;
   console.log(a + b);
7. 7.⚡ Which JavaScript word repeats code? (a) alert() (b) let (c) for (d) console.log()
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 1;
   console.log(x + y); (a) 21 (b) 3 (c) Error
9. 9.⚡ What does this code show?
   let name = "Aman";
   console.log("Welcome, " + name + "!"); (a) Welcome, Aman! (b) Welcome, name! (c) name (d) Aman
10. 10.⚡ What number does this code print?
    let apples = 27;
    apples = apples + 7;
    apples = apples - 4;
    console.log(apples);
11. 11.⚡ Which JavaScript word shows a pop-up box? (a) for (b) alert() (c) let (d) console.log()
12. 12.⚡ What number does this code print?
    let runs = 19;
    runs = runs + 6;
    runs = runs - 22;
    console.log(runs);
13. 13.⚡ Which JavaScript word makes a new variable? (a) for (b) let (c) alert() (d) if
14. 14.⚡ What does alert() show? (a) a table (b) a new tab (c) a picture (d) a pop-up box
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) Error (b) 2 (c) 11
16. 16.⚡ What number does this code print?
    let apples = 21;
    apples = apples + 8;
    apples = apples - 29;
    console.log(apples);
17. 17.⚡ 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
18. 18.⚡ What number does this code print?
    let a = 54;
    let b = 30;
    console.log(a + b);
19. 19.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, Aman! (b) Aman (c) name (d) Hello, name!
20. 20.⚡ What number does this code print?
    let books = 29;
    books = books + 3;
    books = books - 27;
    console.log(books);
21. 21.⚡ What number does this code print?
    let a = 4;
    let b = 12;
    console.log(a * b);
22. 22.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .css (c) .html (d) .js
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 9;
    console.log(x + y); (a) 14 (b) 59 (c) Error
24. 24.⚡ Which JavaScript word runs code when true? (a) let (b) if (c) console.log() (d) alert()
25. 25.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) only colours (d) actions and changes
26. 26.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <style> (d) <script>
27. 27.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Arjun (b) name (c) Hello, Arjun! (d) Hello, name!
28. 28.⚡ What number does this code print?
    let a = 43;
    let b = 4;
    console.log(a + b);
29. 29.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Zoya (c) Well done, Zoya! (d) name
30. 30.⚡ What number does this code print?
    let runs = 22;
    runs = runs + 4;
    runs = runs - 9;
    console.log(runs);
31. 31.⚡ What number does this code print?
    let a = 38;
    let b = 11;
    console.log(a + b);
32. 32.⚡ What number does this code print?
    let a = 8;
    let b = 33;
    console.log(a + b);
33. 33.⚡ What number does this code print?
    let a = 8;
    let b = 3;
    console.log(a * b);
34. 34.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) name (b) Riya (c) Hello, name! (d) Hello, Riya!
35. 35.⚡ What number does this code print?
    let runs = 30;
    runs = runs + 3;
    runs = runs - 23;
    console.log(runs);
36. 36.⚡ What number does this code print?
    let apples = 9;
    apples = apples + 6;
    apples = apples - 7;
    console.log(apples);
37. 37.⚡ What number does this code print?
    let a = 26;
    let b = 5;
    console.log(a - b);
38. 38.⚡ What number does this code print?
    let a = 23;
    let b = 18;
    console.log(a - b);
39. 39.⚡ What number does this code print?
    let apples = 13;
    apples = apples + 15;
    apples = apples - 12;
    console.log(apples);
40. 40.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Aman (b) Well done, name! (c) Well done, Aman! (d) name

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