JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 26 · 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 runs code when true? (a) for (b) console.log() (c) let (d) if
2. 2.⚡ What number does this code print?
   let marks = 7;
   marks = marks + 14;
   marks = marks - 5;
   console.log(marks);
3. 3.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the console (d) in the address bar
4. 4.⚡ What does this code show?
   let name = "Aman";
   alert("Hi, " + name + "!"); (a) Aman (b) Hi, Aman! (c) Hi, name! (d) name
5. 5.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <script> (d) <js>
6. 6.⚡ What number does this code print?
   let a = 2;
   let b = 8;
   console.log(a * b);
7. 7.⚡ What does this code show?
   let name = "Riya";
   alert("Well done, " + name + "!"); (a) Well done, Riya! (b) Well done, name! (c) name (d) Riya
8. 8.⚡ What number does this code print?
   let a = 54;
   let b = 4;
   console.log(a - b);
9. 9.⚡ What does JavaScript add to a web page? (a) only colours (b) actions and changes (c) the page title (d) the domain name
10. 10.⚡ What number does this code print?
    let books = 17;
    books = books + 20;
    books = books - 7;
    console.log(books);
11. 11.⚡ Which JavaScript word writes in the console? (a) alert() (b) console.log() (c) let (d) for
12. 12.⚡ What number does this code print?
    let marks = 7;
    marks = marks + 16;
    marks = marks - 10;
    console.log(marks);
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 8;
    console.log(x + y); (a) 78 (b) Error (c) 15
14. 14.⚡ Which JavaScript word repeats code? (a) let (b) alert() (c) console.log() (d) for
15. 15.⚡ What number does this code print?
    let a = 9;
    let b = 9;
    console.log(a * b);
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 5;
    console.log(x + y); (a) 55 (b) 10 (c) Error
17. 17.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Zoya (b) Hello, name! (c) name (d) Hello, Zoya!
18. 18.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .js (d) .html
19. 19.⚡ What does alert() show? (a) a picture (b) a new tab (c) a table (d) a pop-up box
20. 20.⚡ Which JavaScript word makes a new variable? (a) if (b) let (c) for (d) console.log()
21. 21.⚡ What number does this code print?
    let score = 23;
    score = score + 5;
    score = score - 13;
    console.log(score);
22. 22.⚡ What number does this code print?
    let a = 11;
    let b = 2;
    console.log(a * b);
23. 23.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Hi, Kabir! (b) name (c) Hi, name! (d) Kabir
24. 24.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Riya! (c) Riya (d) name
25. 25.⚡ Which word makes a new variable? (a) give (b) put (c) let (d) make
26. 26.⚡ What number does this code print?
    let runs = 6;
    runs = runs + 17;
    runs = runs - 21;
    console.log(runs);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) 6 (b) Error (c) 33
28. 28.⚡ What number does this code print?
    let marks = 15;
    marks = marks + 15;
    marks = marks - 30;
    console.log(marks);
29. 29.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Zoya! (c) Zoya (d) name
30. 30.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Aman (b) name (c) Welcome, Aman! (d) Welcome, name!
31. 31.⚡ What number does this code print?
    let apples = 10;
    apples = apples + 10;
    apples = apples - 4;
    console.log(apples);
32. 32.⚡ Which JavaScript word shows a pop-up box? (a) for (b) console.log() (c) let (d) alert()
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 4;
    console.log(x + y); (a) 54 (b) Error (c) 9
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 3;
    console.log(x + y); (a) Error (b) 8 (c) 53
35. 35.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Aman! (c) name (d) Aman
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y); (a) Error (b) 6 (c) 51
37. 37.⚡ What number does this code print?
    let score = 29;
    score = score + 3;
    score = score - 6;
    console.log(score);
38. 38.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Kabir (b) Well done, name! (c) name (d) Well done, Kabir!
39. 39.⚡ What number does this code print?
    let a = 2;
    let b = 12;
    console.log(a * b);
40. 40.⚡ What number does this code print?
    let a = 52;
    let b = 32;
    console.log(a + b);

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