JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 951 · 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.⚡ What number does this code print?
   let a = 15;
   let b = 1;
   console.log(a + b);
2. 2.⚡ What number does this code print?
   let score = 28;
   score = score + 20;
   score = score - 14;
   console.log(score);
3. 3.⚡ What number does this code print?
   let a = 4;
   let b = 3;
   console.log(a * b);
4. 4.⚡ What number does this code print?
   let runs = 17;
   runs = runs + 19;
   runs = runs - 20;
   console.log(runs);
5. 5.⚡ What number does this code print?
   let score = 23;
   score = score + 7;
   score = score - 27;
   console.log(score);
6. 6.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .jpg (c) .js (d) .css
7. 7.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) for (d) console.log()
8. 8.⚡ What number does this code print?
   let score = 27;
   score = score + 8;
   score = score - 2;
   console.log(score);
9. 9.⚡ Which JavaScript word writes in the console? (a) for (b) console.log() (c) alert() (d) let
10. 10.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <style> (d) <js>
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 8;
    console.log(x + y); (a) 16 (b) Error (c) 88
12. 12.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Riya (d) Hello, Riya!
13. 13.⚡ Which JavaScript word makes a new variable? (a) let (b) alert() (c) if (d) console.log()
14. 14.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Meera (b) Hello, name! (c) name (d) Hello, Meera!
15. 15.⚡ Where does console.log() show its output? (a) on the printer (b) in the console (c) on the title bar (d) in the address bar
16. 16.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Meera (b) name (c) Hi, name! (d) Hi, Meera!
17. 17.⚡ What number does this code print?
    let a = 4;
    let b = 6;
    console.log(a * b);
18. 18.⚡ What does alert() show? (a) a new tab (b) a table (c) a picture (d) a pop-up box
19. 19.⚡ Which word makes a new variable? (a) let (b) give (c) put (d) make
20. 20.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Hi, Aman! (b) Hi, name! (c) name (d) Aman
21. 21.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) actions and changes (d) the page title
22. 22.⚡ Which JavaScript word repeats code? (a) for (b) console.log() (c) alert() (d) if
23. 23.⚡ What number does this code print?
    let a = 18;
    let b = 13;
    console.log(a + b);
24. 24.⚡ What number does this code print?
    let a = 5;
    let b = 12;
    console.log(a * b);
25. 25.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) name (b) Aman (c) Hello, name! (d) Hello, Aman!
26. 26.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Welcome, Riya! (b) Riya (c) name (d) Welcome, name!
27. 27.⚡ What number does this code print?
    let a = 2;
    let b = 10;
    console.log(a * b);
28. 28.⚡ Which JavaScript word runs code when true? (a) for (b) let (c) console.log() (d) if
29. 29.⚡ What number does this code print?
    let a = 7;
    let b = 5;
    console.log(a * b);
30. 30.⚡ What number does this code print?
    let a = 40;
    let b = 24;
    console.log(a + b);
31. 31.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Well done, Meera! (b) Well done, name! (c) name (d) Meera
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y); (a) 7 (b) 52 (c) Error
33. 33.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Zoya (b) name (c) Welcome, name! (d) Welcome, Zoya!
34. 34.⚡ What number does this code print?
    let coins = 13;
    coins = coins + 20;
    coins = coins - 8;
    console.log(coins);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 5;
    console.log(x + y); (a) 6 (b) 15 (c) Error
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 8;
    console.log(x + y); (a) 68 (b) Error (c) 14
37. 37.⚡ What number does this code print?
    let marks = 14;
    marks = marks + 12;
    marks = marks - 13;
    console.log(marks);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 7;
    console.log(x + y); (a) Error (b) 12 (c) 57
39. 39.⚡ What number does this code print?
    let a = 33;
    let b = 14;
    console.log(a - b);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 8;
    console.log(x + y); (a) 10 (b) 28 (c) Error

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