JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 454 · 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) console.log() (b) alert() (c) for (d) if
2. 2.⚡ 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
3. 3.⚡ What does alert() show? (a) a table (b) a picture (c) a new tab (d) a pop-up box
4. 4.⚡ What number does this code print?
   let score = 7;
   score = score + 11;
   score = score - 2;
   console.log(score);
5. 5.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <script> (d) <code>
6. 6.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) the domain name (d) only colours
7. 7.⚡ What does this code show?
   let name = "Zoya";
   console.log("Hi, " + name + "!"); (a) Zoya (b) Hi, name! (c) Hi, Zoya! (d) name
8. 8.⚡ Which JavaScript word makes a new variable? (a) alert() (b) console.log() (c) for (d) let
9. 9.⚡ What does this code show?
   let name = "Zoya";
   alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Zoya (d) Hi, Zoya!
10. 10.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Arjun (b) name (c) Hello, name! (d) Hello, Arjun!
11. 11.⚡ Which word makes a new variable? (a) give (b) make (c) let (d) put
12. 12.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, Meera! (c) Meera (d) Well done, name!
13. 13.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Aman (b) Welcome, name! (c) Welcome, Aman! (d) name
14. 14.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Arjun! (d) Arjun
15. 15.⚡ What number does this code print?
    let marks = 17;
    marks = marks + 4;
    marks = marks - 1;
    console.log(marks);
16. 16.⚡ What number does this code print?
    let coins = 8;
    coins = coins + 15;
    coins = coins - 12;
    console.log(coins);
17. 17.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .css (c) .html (d) .js
18. 18.⚡ What number does this code print?
    let a = 11;
    let b = 9;
    console.log(a * b);
19. 19.⚡ What number does this code print?
    let a = 47;
    let b = 18;
    console.log(a + b);
20. 20.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Zoya (b) name (c) Hello, name! (d) Hello, Zoya!
21. 21.⚡ What number does this code print?
    let a = 50;
    let b = 15;
    console.log(a + b);
22. 22.⚡ Which JavaScript word writes in the console? (a) for (b) if (c) console.log() (d) let
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) 3 (b) 21 (c) Error
24. 24.⚡ What number does this code print?
    let marks = 28;
    marks = marks + 16;
    marks = marks - 32;
    console.log(marks);
25. 25.⚡ What number does this code print?
    let score = 23;
    score = score + 7;
    score = score - 12;
    console.log(score);
26. 26.⚡ What number does this code print?
    let a = 12;
    let b = 3;
    console.log(a * b);
27. 27.⚡ What number does this code print?
    let a = 7;
    let b = 4;
    console.log(a * b);
28. 28.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Aman! (c) name (d) Aman
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 7;
    console.log(x + y); (a) 16 (b) 97 (c) Error
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 5;
    console.log(x + y); (a) Error (b) 85 (c) 13
31. 31.⚡ What number does this code print?
    let marks = 22;
    marks = marks + 11;
    marks = marks - 14;
    console.log(marks);
32. 32.⚡ What number does this code print?
    let a = 11;
    let b = 32;
    console.log(a + b);
33. 33.⚡ What number does this code print?
    let a = 47;
    let b = 29;
    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) Error (b) 36 (c) 9
35. 35.⚡ What number does this code print?
    let a = 8;
    let b = 38;
    console.log(a + b);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y); (a) 4 (b) Error (c) 31
37. 37.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, Riya! (b) Riya (c) name (d) Welcome, name!
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y); (a) Error (b) 18 (c) 9
39. 39.⚡ What number does this code print?
    let a = 36;
    let b = 9;
    console.log(a - b);
40. 40.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) name (b) Riya (c) Hello, Riya! (d) Hello, name!

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