JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 928 · 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) alert() (b) let (c) if (d) console.log()
2. 2.⚡ What does this code show?
   let name = "Meera";
   alert("Hello, " + name + "!"); (a) Hello, Meera! (b) Meera (c) Hello, name! (d) name
3. 3.⚡ What number does this code print?
   let a = 24;
   let b = 20;
   console.log(a - b);
4. 4.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .jpg (c) .html (d) .css
5. 5.⚡ Which JavaScript word runs code when true? (a) alert() (b) if (c) let (d) for
6. 6.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <script> (d) <style>
7. 7.⚡ What does this code show?
   let name = "Kabir";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Kabir! (c) Kabir (d) name
8. 8.⚡ Which JavaScript word makes a new variable? (a) let (b) if (c) for (d) console.log()
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 9;
   console.log(x + y); (a) 16 (b) Error (c) 79
10. 10.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Aman (c) Hello, Aman! (d) name
11. 11.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Hi, Meera! (b) name (c) Meera (d) Hi, name!
12. 12.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Arjun (c) name (d) Hi, Arjun!
13. 13.⚡ Which JavaScript word shows a pop-up box? (a) if (b) let (c) alert() (d) for
14. 14.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) name (b) Zoya (c) Hi, name! (d) Hi, Zoya!
15. 15.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Meera (b) Hi, Meera! (c) Hi, name! (d) name
16. 16.⚡ What number does this code print?
    let marks = 11;
    marks = marks + 17;
    marks = marks - 16;
    console.log(marks);
17. 17.⚡ What number does this code print?
    let a = 12;
    let b = 7;
    console.log(a * b);
18. 18.⚡ What does alert() show? (a) a picture (b) a table (c) a new tab (d) a pop-up box
19. 19.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Riya (b) name (c) Well done, Riya! (d) Well done, name!
20. 20.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) actions and changes (d) only colours
21. 21.⚡ What number does this code print?
    let a = 25;
    let b = 5;
    console.log(a + b);
22. 22.⚡ What number does this code print?
    let score = 28;
    score = score + 19;
    score = score - 24;
    console.log(score);
23. 23.⚡ What number does this code print?
    let a = 58;
    let b = 20;
    console.log(a - b);
24. 24.⚡ Which JavaScript word repeats code? (a) if (b) for (c) let (d) console.log()
25. 25.⚡ 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
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) 7 (b) 43 (c) Error
27. 27.⚡ What number does this code print?
    let books = 24;
    books = books + 17;
    books = books - 35;
    console.log(books);
28. 28.⚡ Which word makes a new variable? (a) let (b) make (c) put (d) give
29. 29.⚡ What number does this code print?
    let a = 23;
    let b = 2;
    console.log(a + b);
30. 30.⚡ What number does this code print?
    let marks = 8;
    marks = marks + 6;
    marks = marks - 2;
    console.log(marks);
31. 31.⚡ What number does this code print?
    let a = 49;
    let b = 5;
    console.log(a - b);
32. 32.⚡ What number does this code print?
    let a = 11;
    let b = 6;
    console.log(a * b);
33. 33.⚡ What number does this code print?
    let apples = 8;
    apples = apples + 18;
    apples = apples - 23;
    console.log(apples);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 4;
    console.log(x + y); (a) 7 (b) Error (c) 34
35. 35.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Aman (c) Well done, Aman! (d) name
36. 36.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Welcome, Meera! (b) Welcome, name! (c) name (d) Meera
37. 37.⚡ What number does this code print?
    let a = 3;
    let b = 4;
    console.log(a * b);
38. 38.⚡ What number does this code print?
    let apples = 25;
    apples = apples + 4;
    apples = apples - 24;
    console.log(apples);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) 23 (b) Error (c) 5
40. 40.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Aman! (c) name (d) Aman

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