JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 555 · 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 = "Aman";
   console.log("Well done, " + name + "!"); (a) Aman (b) name (c) Well done, name! (d) Well done, Aman!
2. 2.⚡ What does this code show?
   let name = "Zoya";
   console.log("Hello, " + name + "!"); (a) Hello, Zoya! (b) Zoya (c) Hello, name! (d) name
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 6;
   console.log(x + y); (a) Error (b) 96 (c) 15
4. 4.⚡ Which word makes a new variable? (a) give (b) put (c) let (d) make
5. 5.⚡ What does alert() show? (a) a picture (b) a table (c) a new tab (d) a pop-up box
6. 6.⚡ What does this code show?
   let name = "Riya";
   console.log("Hello, " + name + "!"); (a) Hello, Riya! (b) Hello, name! (c) name (d) Riya
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 2;
   console.log(x + y); (a) Error (b) 42 (c) 6
8. 8.⚡ What number does this code print?
   let apples = 29;
   apples = apples + 11;
   apples = apples - 20;
   console.log(apples);
9. 9.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) only colours (d) actions and changes
10. 10.⚡ Which JavaScript word makes a new variable? (a) for (b) alert() (c) if (d) let
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) Error (b) 81 (c) 9
12. 12.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) Well done, Meera! (b) Well done, name! (c) Meera (d) name
13. 13.⚡ What number does this code print?
    let a = 56;
    let b = 37;
    console.log(a - b);
14. 14.⚡ Which JavaScript word runs code when true? (a) if (b) console.log() (c) for (d) alert()
15. 15.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Riya (b) Hi, name! (c) Hi, Riya! (d) name
16. 16.⚡ What number does this code print?
    let marks = 6;
    marks = marks + 5;
    marks = marks - 11;
    console.log(marks);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 8;
    console.log(x + y); (a) Error (b) 10 (c) 28
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 1;
    console.log(x + y); (a) 71 (b) Error (c) 8
19. 19.⚡ What number does this code print?
    let runs = 24;
    runs = runs + 7;
    runs = runs - 28;
    console.log(runs);
20. 20.⚡ What number does this code print?
    let a = 2;
    let b = 12;
    console.log(a * b);
21. 21.⚡ Where does console.log() show its output? (a) in the console (b) in the address bar (c) on the printer (d) on the title bar
22. 22.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) name (b) Riya (c) Hi, name! (d) Hi, Riya!
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 5;
    console.log(x + y); (a) 9 (b) Error (c) 45
24. 24.⚡ Which JavaScript word repeats code? (a) let (b) console.log() (c) alert() (d) for
25. 25.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Aman (c) Well done, Aman! (d) name
26. 26.⚡ What number does this code print?
    let marks = 28;
    marks = marks + 5;
    marks = marks - 26;
    console.log(marks);
27. 27.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Aman (d) Hi, Aman!
28. 28.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .jpg (d) .js
29. 29.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Meera! (c) name (d) Meera
30. 30.⚡ Which JavaScript word writes in the console? (a) console.log() (b) if (c) alert() (d) let
31. 31.⚡ What number does this code print?
    let marks = 19;
    marks = marks + 11;
    marks = marks - 12;
    console.log(marks);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 5;
    console.log(x + y); (a) 13 (b) 85 (c) Error
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 9;
    console.log(x + y); (a) Error (b) 17 (c) 89
34. 34.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Zoya! (c) name (d) Zoya
35. 35.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) if (c) for (d) console.log()
36. 36.⚡ What number does this code print?
    let a = 7;
    let b = 10;
    console.log(a * b);
37. 37.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Hello, Zoya! (b) Hello, name! (c) name (d) Zoya
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y); (a) Error (b) 51 (c) 6
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 7;
    console.log(x + y); (a) 12 (b) Error (c) 57
40. 40.⚡ What number does this code print?
    let a = 35;
    let b = 25;
    console.log(a + b);

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