JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 189 · 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 does this code show?
   let name = "Zoya";
   alert("Hello, " + name + "!"); (a) name (b) Zoya (c) Hello, name! (d) Hello, Zoya!
2. 2.⚡ What does this code show?
   let name = "Zoya";
   console.log("Hi, " + name + "!"); (a) Hi, Zoya! (b) name (c) Hi, name! (d) Zoya
3. 3.⚡ What does this code show?
   let name = "Arjun";
   console.log("Well done, " + name + "!"); (a) Well done, Arjun! (b) name (c) Well done, name! (d) Arjun
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 3;
   console.log(x + y); (a) 9 (b) 63 (c) Error
5. 5.⚡ What number does this code print?
   let apples = 5;
   apples = apples + 13;
   apples = apples - 1;
   console.log(apples);
6. 6.⚡ What number does this code print?
   let a = 9;
   let b = 7;
   console.log(a * b);
7. 7.⚡ What does this code show?
   let name = "Aman";
   alert("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Aman (d) Hello, Aman!
8. 8.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) actions and changes (d) only colours
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 5;
   console.log(x + y); (a) 10 (b) Error (c) 55
10. 10.⚡ Which JavaScript word repeats code? (a) if (b) for (c) let (d) console.log()
11. 11.⚡ Which JavaScript word runs code when true? (a) let (b) if (c) console.log() (d) alert()
12. 12.⚡ What number does this code print?
    let runs = 15;
    runs = runs + 4;
    runs = runs - 2;
    console.log(runs);
13. 13.⚡ What number does this code print?
    let score = 9;
    score = score + 19;
    score = score - 10;
    console.log(score);
14. 14.⚡ What number does this code print?
    let a = 23;
    let b = 4;
    console.log(a + b);
15. 15.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the console (d) in the address bar
16. 16.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Well done, Arjun! (b) name (c) Arjun (d) Well done, name!
17. 17.⚡ What number does this code print?
    let apples = 15;
    apples = apples + 8;
    apples = apples - 2;
    console.log(apples);
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 9;
    console.log(x + y); (a) 39 (b) Error (c) 12
19. 19.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Zoya (b) Welcome, name! (c) name (d) Welcome, Zoya!
20. 20.⚡ What number does this code print?
    let apples = 6;
    apples = apples + 15;
    apples = apples - 6;
    console.log(apples);
21. 21.⚡ What number does this code print?
    let apples = 10;
    apples = apples + 8;
    apples = apples - 12;
    console.log(apples);
22. 22.⚡ Which word makes a new variable? (a) make (b) let (c) give (d) put
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 9;
    console.log(x + y); (a) 89 (b) 17 (c) Error
24. 24.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, Riya! (b) Riya (c) Hello, name! (d) name
25. 25.⚡ What does alert() show? (a) a table (b) a new tab (c) a picture (d) a pop-up box
26. 26.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .jpg (c) .css (d) .js
27. 27.⚡ What number does this code print?
    let a = 8;
    let b = 8;
    console.log(a * b);
28. 28.⚡ What number does this code print?
    let a = 6;
    let b = 35;
    console.log(a + b);
29. 29.⚡ What number does this code print?
    let coins = 15;
    coins = coins + 8;
    coins = coins - 17;
    console.log(coins);
30. 30.⚡ What number does this code print?
    let apples = 12;
    apples = apples + 17;
    apples = apples - 18;
    console.log(apples);
31. 31.⚡ What number does this code print?
    let apples = 22;
    apples = apples + 12;
    apples = apples - 17;
    console.log(apples);
32. 32.⚡ Which JavaScript word makes a new variable? (a) alert() (b) let (c) console.log() (d) if
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 3;
    console.log(x + y); (a) 8 (b) Error (c) 53
34. 34.⚡ What number does this code print?
    let score = 26;
    score = score + 4;
    score = score - 16;
    console.log(score);
35. 35.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Zoya (c) Hi, Zoya! (d) name
36. 36.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Arjun (d) Hello, Arjun!
37. 37.⚡ What number does this code print?
    let marks = 11;
    marks = marks + 14;
    marks = marks - 15;
    console.log(marks);
38. 38.⚡ What number does this code print?
    let a = 51;
    let b = 12;
    console.log(a - b);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 9;
    console.log(x + y); (a) 18 (b) Error (c) 99
40. 40.⚡ What number does this code print?
    let a = 16;
    let b = 4;
    console.log(a - b);

Free html and css lessons, practice and worksheets at talentjr.in/html-css-for-kids