JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 758 · 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 shows a pop-up box? (a) console.log() (b) let (c) for (d) alert()
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 8;
   console.log(x + y); (a) 15 (b) 78 (c) Error
3. 3.⚡ What does this code show?
   let name = "Meera";
   console.log("Hello, " + name + "!"); (a) Hello, Meera! (b) name (c) Hello, name! (d) Meera
4. 4.⚡ What number does this code print?
   let a = 51;
   let b = 2;
   console.log(a - b);
5. 5.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .jpg (d) .js
6. 6.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) actions and changes (d) the page title
7. 7.⚡ What does this code show?
   let name = "Riya";
   alert("Hi, " + name + "!"); (a) Hi, Riya! (b) Riya (c) Hi, name! (d) name
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 2;
   console.log(x + y); (a) 6 (b) 42 (c) Error
9. 9.⚡ What number does this code print?
   let a = 11;
   let b = 2;
   console.log(a * b);
10. 10.⚡ What number does this code print?
    let a = 45;
    let b = 39;
    console.log(a + b);
11. 11.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Kabir! (c) name (d) Kabir
12. 12.⚡ Which word makes a new variable? (a) put (b) give (c) make (d) let
13. 13.⚡ 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
14. 14.⚡ Which JavaScript word writes in the console? (a) let (b) for (c) console.log() (d) alert()
15. 15.⚡ Which JavaScript word makes a new variable? (a) alert() (b) console.log() (c) let (d) for
16. 16.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) Well done, Zoya! (b) Well done, name! (c) name (d) Zoya
17. 17.⚡ What number does this code print?
    let a = 13;
    let b = 6;
    console.log(a + b);
18. 18.⚡ What number does this code print?
    let a = 8;
    let b = 8;
    console.log(a * b);
19. 19.⚡ What number does this code print?
    let a = 5;
    let b = 5;
    console.log(a * b);
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 7;
    console.log(x + y); (a) Error (b) 57 (c) 12
21. 21.⚡ What number does this code print?
    let score = 24;
    score = score + 19;
    score = score - 21;
    console.log(score);
22. 22.⚡ What does alert() show? (a) a table (b) a picture (c) a new tab (d) a pop-up box
23. 23.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, Arjun! (c) Arjun (d) Welcome, name!
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) 41 (b) Error (c) 5
25. 25.⚡ What number does this code print?
    let a = 35;
    let b = 29;
    console.log(a + b);
26. 26.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <style> (c) <script> (d) <js>
27. 27.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Riya (b) name (c) Well done, name! (d) Well done, Riya!
28. 28.⚡ What number does this code print?
    let a = 27;
    let b = 19;
    console.log(a - b);
29. 29.⚡ What number does this code print?
    let a = 31;
    let b = 20;
    console.log(a + b);
30. 30.⚡ Which JavaScript word runs code when true? (a) if (b) for (c) let (d) console.log()
31. 31.⚡ What number does this code print?
    let marks = 22;
    marks = marks + 6;
    marks = marks - 9;
    console.log(marks);
32. 32.⚡ What number does this code print?
    let apples = 30;
    apples = apples + 13;
    apples = apples - 1;
    console.log(apples);
33. 33.⚡ What number does this code print?
    let a = 32;
    let b = 13;
    console.log(a - b);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y); (a) 36 (b) 9 (c) Error
35. 35.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Arjun (c) Hi, Arjun! (d) name
36. 36.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Kabir (b) Welcome, name! (c) Welcome, Kabir! (d) name
37. 37.⚡ What number does this code print?
    let a = 12;
    let b = 11;
    console.log(a * b);
38. 38.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Riya (c) name (d) Well done, Riya!
39. 39.⚡ Where does console.log() show its output? (a) in the address bar (b) in the console (c) on the printer (d) on the title bar
40. 40.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) Kabir (b) Welcome, Kabir! (c) name (d) Welcome, name!

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