JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 530 · 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 alert() show? (a) a pop-up box (b) a picture (c) a table (d) a new tab
2. 2.⚡ What number does this code print?
   let a = 25;
   let b = 14;
   console.log(a + b);
3. 3.⚡ What number does this code print?
   let marks = 18;
   marks = marks + 14;
   marks = marks - 8;
   console.log(marks);
4. 4.⚡ What number does this code print?
   let a = 5;
   let b = 10;
   console.log(a + b);
5. 5.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) for (c) console.log() (d) let
6. 6.⚡ What number does this code print?
   let runs = 19;
   runs = runs + 18;
   runs = runs - 24;
   console.log(runs);
7. 7.⚡ What does this code show?
   let name = "Meera";
   alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Meera (d) Hello, Meera!
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 7;
   console.log(x + y); (a) Error (b) 97 (c) 16
9. 9.⚡ What does this code show?
   let name = "Aman";
   alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Aman! (c) name (d) Aman
10. 10.⚡ What number does this code print?
    let apples = 18;
    apples = apples + 6;
    apples = apples - 12;
    console.log(apples);
11. 11.⚡ What number does this code print?
    let a = 7;
    let b = 8;
    console.log(a + b);
12. 12.⚡ Which JavaScript word writes in the console? (a) if (b) console.log() (c) for (d) let
13. 13.⚡ What number does this code print?
    let a = 34;
    let b = 10;
    console.log(a - b);
14. 14.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, Riya! (b) Riya (c) Well done, name! (d) name
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) 56 (b) 11 (c) Error
16. 16.⚡ Where does console.log() show its output? (a) in the console (b) in the address bar (c) on the title bar (d) on the printer
17. 17.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Riya (b) Welcome, name! (c) name (d) Welcome, Riya!
18. 18.⚡ What number does this code print?
    let a = 38;
    let b = 16;
    console.log(a + b);
19. 19.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) name (b) Aman (c) Hello, Aman! (d) Hello, name!
20. 20.⚡ What number does this code print?
    let a = 7;
    let b = 10;
    console.log(a * b);
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 6;
    console.log(x + y); (a) Error (b) 26 (c) 8
22. 22.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Aman (c) Hello, Aman! (d) name
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y); (a) 13 (b) Error (c) 67
24. 24.⚡ What number does this code print?
    let apples = 26;
    apples = apples + 11;
    apples = apples - 12;
    console.log(apples);
25. 25.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Meera (c) name (d) Hi, Meera!
26. 26.⚡ What number does this code print?
    let a = 22;
    let b = 11;
    console.log(a + b);
27. 27.⚡ Which JavaScript word repeats code? (a) for (b) console.log() (c) if (d) alert()
28. 28.⚡ What number does this code print?
    let a = 55;
    let b = 31;
    console.log(a + b);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) Error (b) 5 (c) 32
30. 30.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .css (c) .html (d) .js
31. 31.⚡ What number does this code print?
    let runs = 11;
    runs = runs + 20;
    runs = runs - 11;
    console.log(runs);
32. 32.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Hello, Kabir! (b) Hello, name! (c) Kabir (d) name
33. 33.⚡ What number does this code print?
    let score = 7;
    score = score + 7;
    score = score - 6;
    console.log(score);
34. 34.⚡ What number does this code print?
    let a = 44;
    let b = 7;
    console.log(a - b);
35. 35.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Kabir (c) name (d) Welcome, Kabir!
36. 36.⚡ What number does this code print?
    let books = 25;
    books = books + 12;
    books = books - 20;
    console.log(books);
37. 37.⚡ Which JavaScript word runs code when true? (a) if (b) console.log() (c) let (d) alert()
38. 38.⚡ Which word makes a new variable? (a) put (b) make (c) give (d) let
39. 39.⚡ What number does this code print?
    let books = 10;
    books = books + 10;
    books = books - 2;
    console.log(books);
40. 40.⚡ What number does this code print?
    let a = 11;
    let b = 11;
    console.log(a * b);

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